Fault, warning and safety-shutdown messages documented by Johnson Controls for the YORK YMC2. Each row cites the page of the manual it was taken from — nothing here is summarised or reworded.
From YMC2 Mod A Centrifugal Chiller with OptiView Control Center, Control Panel Operation Guide 160.78-O2
Original: docs.johnsoncontrols.com
Run messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING – VSD DC BUS ACTIVE | Non-annunciating alert that the DC Bus is precharged or pre-regulated for a state outside of chiller run. | Set when the VSD indicates a precharge or pre-regulated state or DC Bus voltage >50 V in the stopped state. | A countdown timer shows with this message to indicate the time remaining in a precharge or pre-regulate command while stopped. | 114 |
Start inhibit messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| LINE FREQUENCY NOT SET | Chiller prevented from starting because the Line Frequency setpoint is invalid. | This start inhibit is set when the Line Voltage setpoint is INVALID. Line Frequency is set invalid on a new or cleared BRAM until programmed. | Set on a new or cleared BRAM; remains until the Line Frequency is programmed. | 114 |
| LINE VOLTAGE NOT SET | Chiller prevented from starting because the Line Voltage setpoint is invalid. | This start inhibit is set when the Line Voltage setpoint is INVALID. Line Voltage is set invalid on a new or cleared BRAM until programmed. | Set on a new or cleared BRAM; remains until the Line Voltage is programmed. | 114 |
| PRV NOT CALIBRATED | Start inhibited because the Pre-rotation vanes calibration has not been done. | The Pre-rotation vanes calibration procedure has not yet been performed. | Perform the Pre-rotation vanes calibration procedure (PRV Calibrate screen; only available if the chiller is stopped). | 114 |
| VGD NOT CALIBRATED | Start inhibited because the Variable Geometry Diffuser calibration has not been done. | The Variable Geometry Diffuser calibration procedure has NOT yet been performed. | Perform the VGD calibration procedure (VGD Calibrate screen). | 114 |
Warning messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING – MBC – LANDING COUNTER HIGH | MBC landing counter has reached its warning threshold of shaft landing events. | The MBC landing counter has accumulated 30 events where the motor shaft displacement exceeded 120 µm (80% of the air gap space to the touchdown bearing) while shaft rotation is detected. | Released only when a service technician checks the shaft air gap measurement for acceptability and resets the MBC according to the driveline service manual YORK YMC2 Service Manual (Form 160.78-M2). | 115 |
| WARNING – MBC – ROTATION MODE OFF | MBC reports Rotation Mode OFF while the microboard is commanding it ON. | During the time the MBC Rotation Mode is commanded ON by the microboard via serial comms this warning is set if the MBC reports Rotation Mode is OFF by serial comms. | Inhibited if MBC communication is not initiated and during the first 15 seconds after the Rotation Mode is commanded ON. Released when Rotation Mode status matches the microboard command to the MBC. | 115 |
| WARNING – MOTOR – HIGH CURRENT LIMIT | Motor current has reached the Motor Overload current limit; capacity control is overriding to reduce current. | The chiller motor current is greater than or equal to the Motor Overload current limit. The Motor Overload current limit is predetermined from the motor model and Maximum VSD Output Current. | While this condition is in effect, chiller capacity control is in override to reduce current. Automatically clears when the motor current decreases below this limit. | 115 |
| WARNING – CONDENSER – HIGH PRESSURE LIMIT | Condenser pressure exceeds the High Pressure Warning Setpoint; capacity override active. | The Condenser Pressure exceeds the High Pressure Warning Setpoint threshold, programmed by a Service technician logged in at SERVICE access level. | While in effect, the chiller capacity is in override to reduce pressure. Automatically clears and normal LCHLT capacity control is restored when the Condenser pressure decreases to below the Setpoint. | 115 |
| WARNING – CONDENSER OR EVAPORATOR XDCR ERROR | Evaporator pressure transducer reads higher than the condenser transducer — indicative of a transducer failure. | The Evaporator pressure Transducer is indicating a higher pressure than the Condenser pressure Transducer after the chiller has been running for 10 minutes. This is indicative of a Condenser or Evaporator Transducer failure. | Displayed until the condition clears and the WARNING RESET Keypad button is pressed in OPERATOR (or higher) access mode. Condition not checked in Brine mode. | 115 |
| WARNING – CONDENSER OR VGD SENSOR FAILURE | Stall (discharge) pressure transducer and condenser pressure transducer outputs disagree; VGD held full open while the warning stands. | The difference between the Stall Pressure Transducer output (discharge pressure) and the Condenser Pressure Transducer output has exceeded 0.28 VDC for 3 continuous minutes while the chiller was running. Both transducers measure essentially the same pressure and should be within the specified tolerance. | Must be manually cleared. Displayed until the transducer outputs are within the acceptable range of each other and the WARNING RESET button is pressed in SERVICE access level. While displayed, the VGD is driven to the full open position and held; when cleared, the VGD returns to normal operation. | 115 |
| WARNING – EVAPORATOR – LOW PRESSURE LIMIT | Evaporator pressure has fallen to the warning threshold; capacity control overriding to raise suction pressure. | The Evaporator pressure has decreased to the Warning threshold. Fixed in Water cooling applications; in Brine applications the threshold is a fixed amount above the programmable safety shutdown threshold determined by the brine solution at the YORK Factory. Warning/reset thresholds (psig): R-134a 27.8 / 28.8 (water), 1.7 / 2.7 above safety setpoint (brine); R-513A 32.0 / 33.0, 1.8 / 2.8; R-1234ze 16.7 / 17.7, 1.3 / 2.3; R-515B 16.5 / 17.5, 1.3 / 2.3. | While in effect, the chiller capacity control is in override to increase suction pressure. Automatically clears and normal LCHLT capacity control is restored when the Evaporator pressure increases to the reset value. | 115 |
| WARNING – EXCESS SURGE DETECTED | Surge Window Count has exceeded the Count Limit (applies only if Surge Protection SHUTDOWN is Disabled). | This applies only if Surge Protection SHUTDOWN feature is Disabled. The Surge Window Count has exceeded the Count Limit. | Can be manually cleared after the Surge Window Count is less than or equal to the Count Limit, or the SHUTDOWN feature is Enabled, or the chiller is stopped. To clear, press WARNING RESET button on HOME Screen when logged in at OPERATOR (or higher) access level. | 116 |
| WARNING – MOTOR – HIGH HOUSING TEMPERATURE | Motor housing temperature at or above the warning level. | The Motor Housing Temperature is greater than or equal to 167°F (75°C). | Released when Motor Housing Temperature is less than 158°F (70°C). | 116 |
| WARNING - MOTOR – HIGH WINDING TEMPERATURE | An enabled motor winding temperature has exceeded the warning threshold. | Occurs when any of the enabled motor winding temperatures exceeds 275°F (135°C) for 3 continuous seconds. | Automatically clears when all winding temperatures decrease below the warning threshold. Will not act on any individual winding temperature sensor disabled with the TEMPERATURE DISABLED Setpoint on the Motor Details Screen. | 116 |
| WARNING – REAL TIME CLOCK FAILURE | BRAM / real-time clock failed its power-up test. | During the initialization process when power is applied, test data is written to the BRAM battery backed memory device (IC location U52 on Microboard), read back and compared; if the read data is not the same as that written, the BRAM and Real Time Clock operation is assumed defective. | The BRAM should be replaced by a qualified Service Technician. Automatically clears when the BRAM problem has been solved. | 116 |
| WARNING – SETPOINT OVERRIDE | Blank or failed BRAM detected at power-up; all setpoints reverted to defaults. | A blank BRAM battery-backed memory device (IC location U52 on Microboard) or a failure of this device was detected during initialization. Any or all of the programmed Setpoints could have been corrupted; therefore all Setpoints have been automatically changed to their Default values. | All Setpoints will have to be programmed to their desired values. Clears when the WARNING RESET button is pressed in OPERATOR (or higher) access mode. | 116 |
| WARNING – VSD – INPUT VOLTAGE IMBALANCE | Supply line-to-line voltage imbalance above 5%. | Line voltage imbalance is calculated for every VSD communications cycle as Vimb% = max(|Vab-Vavg|,|Vbc-Vavg|,|Vca-Vavg|) x 100%/Vavg. If Vimb% exceeds 5% continuously for 45 seconds, the warning is displayed. | The 45 second timer resets and the warning clears if three consecutive imbalance readings fall below the 5% threshold. | 116 |
Cycling shutdown messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| CHILLED LIQUID – FLOW SWITCH OPEN | Loss of chilled liquid flow signal while running or starting. | The Chilled Liquid Flow Switch has remained open for 5 continuous seconds while the chiller was running, in soft shutdown, or at least 45 seconds after MBC startup is initiated. | The chiller will automatically restart when the flow switch closes. | 117 |
| CONDENSER – FLOW SWITCH OPEN | Loss of condenser liquid flow signal while running. | The Condenser water flow switch has remained open for 5 continuous seconds while the chiller was running or in soft shutdown. This check is bypassed until System Run is achieved. | The chiller will automatically restart when the flow switch closes. | 117 |
| CONTROL PANEL – LOSS OF CONTROL VOLTAGE | Control power input signal low. | The control power input signal at I/O board TB3-81 was low for 1 second continuous. This signal is used to determine when the digital inputs are affected by a panel power loss versus an actual condition for their devices. This fault is not expected on an actual loss of microboard power, because the processor will be off before the fault delay. | The chiller will automatically restart when the cycling condition clears. | 117 |
| CONTROL PANEL – POWER FAILURE | Control power failure occurred (cycling version when displayed in orange). | A Control Power failure has occurred. This message can indicate a Cycling (auto-restart after power failure) or Safety (manual restart after power failure) shutdown, depending upon control center configuration. It indicates a cycling shutdown when displayed in orange characters; Safety shutdown when displayed in red characters. | If the power failure occurred while the chiller was running, it will automatically restart when power is restored. Auto-restart or manual restart is configured by a qualified Service Technician following instructions in YORK YMC2 Service Manual (Form 160.78-M2). | 117 |
| CONTROL PANEL – SCHEDULE | Chiller shut down by its programmed daily schedule. | The programmed Daily Schedule Setpoint has shutdown the chiller. If this occurs while the chiller is running, a Soft Shutdown is performed. | The chiller will automatically restart at the next scheduled start time. | 117 |
| EVAPORATOR – LOW PRESSURE | Evaporator (suction) pressure fell to the cycling shutdown threshold. | The evaporator pressure, as sensed by the evaporator transducer, has decreased to the shutdown threshold. For water cooling applications the shutdown threshold is a fixed value; for brine it varies with brine solution concentration and is programmed at the YORK factory (not to be changed except by a qualified Service Technician per Form 160.78-M2). Shutdown/reset thresholds (psig): R-134a 26.1 / 26.2 (water), 6.0–30.0 as programmed / 0.1 > shutdown threshold (brine); R-513A 30.2 / 30.2, 8.8–34.4 / 0.1 >; R-1234ze 15.4 / 15.5, 0.4–18.4 / 0.1 >; R-515B 15.2 / 15.3, 0.3–18.2 / 0.1 >. | The chiller will restart after the evaporator pressure increases to the restart threshold. If this shutdown occurs three times in a 90 minute period, an EVAPORATOR-LOW PRESSURE safety shutdown is initiated. | 118 |
| EXPANSION I/O – SERIAL COMMUNICATIONS | Communication between microboard and expansion I/O board lost. | Valid communication between the microboard and the LTC I/O Board have been disrupted for three consecutive attempts. | The chiller will automatically restart when valid communication is received. | 118 |
| LEAVING CHILLED LIQUID – LOW TEMPERATURE | Leaving chilled liquid fell to the programmed shutdown temperature. | The Leaving Chilled Liquid Temperature has decreased to the programmed Shutdown Temperature Setpoint. If the chiller is running when this occurs, a soft shutdown is performed. | The chiller will automatically restart when the temperature increases to the programmed Restart Temperature Setpoint. | 118 |
| MBC – HIGH AMPLIFIER TEMPERATURE | MBC amplifier board overtemperature (cycling level). | Set when the MBC amplifier temperature exceeds 140ºF (60ºC). Determined by the OptiView control software from temperature data transmitted through the serial comms. | Released when amplifier temperature drops 18ºF (10ºC) below the trip value. | 118 |
| MBC – HIGH DC/DC TEMPERATURE | MBC DC/DC converter board overtemperature (cycling level). | Set when the MBC DC/DC Converter board temperature exceeds 167ºF (75ºC). Determined by the OptiView control software from temperature data transmitted through the serial comms. | Released when DC/DC converter temperature drops 18ºF (10ºC) below the trip value. | 118 |
| MBC – SERIAL COMMUNICATIONS | Invalid or missing responses from the MBC over Modbus. | Set when an invalid or no response is received from the MBC to a Modbus command from the panel for eight successive requests (thresholds of consecutive timeouts, ID mismatches, checksum failures, or error packets). Becomes active during the Stopped State or MBC Startup State when the MBC initializes; stays active during Run and Soft Shutdown; becomes inactive at coastdown or stop when the DC Bus Voltage is less than 100 V. | Released when a valid response is received. | 118 |
| MBC SHUTDOWN – REQUESTING FAULT DATA | MBC shut the chiller down; cause not yet received over the serial link. | The MBC has shutdown the chiller and the control center has not yet received the cause of the fault from the MBC via the serial communications link. The MBC shuts down the chiller by opening the MBC Emergency Shutdown (ESD) contacts (located on the MBC control board and connected between TB6-15 and TB6-53 in the control center). Because serial communications are initiated every 2 seconds, this message appears for a few seconds. | Then replaced with one of the other MBC fault messages in this section. | 118 |
| MBC – SPEED SIGNAL FAULT | MBC lost the speed signal from the VSD during Rotation Mode. | Set when the MBC looses the speed signal that is expected from the VSD while the MBC is commanded in Rotation Mode. The MBC ESD Fault contacts open; the MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. A 10 second bypass exists when the initial command to Rotation Mode occurs. | Released when the transmission is reestablished. | 119 |
| MBC – STARTUP FAILURE | Chiller failed to exit the MBC startup state within 60 seconds. | Set when the chiller fails to exit the MBC startup state within 60 seconds, during a chiller start. | Refer to YORK YMC2 Service Manual (Form 160.78-M2) for conditions necessary to complete MBC startup successfully. Check fault history details to determine which specific conditions were not met. | 119 |
| MBC – STOP (FAULT) CONTACTS OPEN | MBC ESD fault cause not received within 10 seconds. | See the previous MBC Shutdown – Requesting Fault Data message. If the control center’s microboard does not receive the cause of the MBC ESD fault over the serial link within 10 seconds after the ESD contacts open is recognized, it is assumed it is not forthcoming and that message is replaced with this message. | The chiller will automatically restart when the cycling condition clears. | 119 |
| MBC – V13 LOW FREQUENCY DISPLACEMENT | Excessive low-frequency shaft displacement at the impeller-end radial bearing, V axis. | The MBC has measured shaft displacement greater than 75 µm from center in the orthogonal radial axis designated V at the impeller end radial magnetic bearing during Levitation or Rotation mode over a 7 second window (approximately one-third of the air gap space to the touchdown bearing). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 75 µm. | 119 |
| MBC – V13 POSITION | Shaft displacement out of position at the impeller-end radial bearing, V axis. | The MBC has measured shaft displacement greater than 75 µm from center in the orthogonal radial axis designated V at the impeller end radial magnetic bearing during Levitation or Rotation mode (approximately half of the air gap space to the touchdown bearing). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 75 µm. | 119 |
| MBC – V24 LOW FREQUENCY DISPLACEMENT | Excessive low-frequency shaft displacement at the opposite-impeller-end radial bearing, V axis. | The MBC has measured shaft displacement greater than 75 µm from center in the orthogonal radial axis designated V at the opposite-impeller end radial magnetic bearing during Levitation or Rotation mode over a 7 second window (approximately 1/3 of the air gap space to the touchdown bearing). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 75 µm. | 119 |
| MBC – V24 POSITION | Shaft displacement out of position at the opposite-impeller-end radial bearing, V axis. | The MBC has measured shaft displacement greater than 75 µm from center in the orthogonal radial axis designated V at the opposite-impeller end radial magnetic bearing during Levitation or Rotation mode (approximately half of the air gap space to the touchdown bearing). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 75 µm. | 119 |
| MBC – W13 LOW FREQUENCY DISPLACEMENT | Excessive low-frequency shaft displacement at the impeller-end radial bearing, W axis. | The MBC has measured shaft displacement greater than 75 µm from center in the orthogonal radial axis designated W at the impeller end radial magnetic bearing during Levitation or Rotation mode over a 7 second window (approximately one-third of the air gap space to the touchdown bearing). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 75 µm. | 119 |
| MBC – W13 POSITION | Shaft displacement out of position at the impeller-end radial bearing, W axis. | The MBC has measured shaft displacement greater than 75 µm from center in the orthogonal radial axis designated W at the impeller end radial magnetic bearing during Levitation or Rotation mode (approximately half of the air gap space to the touchdown bearing). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 75 µm. | 120 |
| MBC – W24 LOW FREQUENCY DISPLACEMENT | Excessive low-frequency shaft displacement at the opposite-impeller-end radial bearing, W axis. | The MBC has measured shaft displacement greater than 75 µm from center in the orthogonal radial axis designated W at the opposite-impeller end radial magnetic bearing during Levitation or Rotation mode over a 7 second window (approximately one-third of the air gap space to the touchdown bearing). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 75 µm. | 120 |
| MBC – W24 POSITION | Shaft displacement out of position at the opposite-impeller-end radial bearing, W axis. | The MBC has measured shaft displacement greater than 75 µm from center in the orthogonal radial axis designated W at the opposite-impeller end radial magnetic bearing during Levitation or Rotation mode (approximately half of the air gap space to the touchdown bearing). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 75 µm. | 120 |
| MBC – VW13 VIBRATION | Synchronous shaft vibration above limit at the impeller-end radial bearing. | The MBC has measured synchronous speed (first harmonic) shaft vibration at the impeller end radial magnetic bearing greater than 60 µm from 0 to the peak amplitude in Rotation mode. Monitored only when the AVR and ABS filter is on, which occurs for speed above 80 Hz. The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when vibration is less than 60 µm. | 120 |
| MBC – VW24 VIBRATION | Synchronous shaft vibration above limit at the opposite-impeller-end radial bearing. | The MBC has measured synchronous speed (first harmonic) shaft vibration at the opposite-impeller end radial magnetic bearing greater than 60 µm from 0 to the peak amplitude in Rotation mode. Monitored only when the AVR and ABS filter is on, which occurs for speed above 80 Hz. The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when vibration is less than 60 µm. | 120 |
| MBC – Z12 LOW FREQUENCY DISPLACEMENT | Excessive axial shaft displacement over a 7-second window. | The MBC has measured shaft displacement greater than 100 µm axially from the design running position over a 7 second window (approximately 1/3 of the air gap space to the touchdown bearing axially). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 100 µm. | 120 |
| MBC – Z12 POSITION | Axial shaft displacement out of position. | The MBC has measured shaft displacement greater than 100 µm axially from the design running position (approximately 1/2 of the air gap space to the touchdown bearing axially). The MBC ESD Fault contacts open; the MBC remains in Levitation mode until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when displacement is less than 100 µm. | 120 |
| MULTIUNIT CYCLING – CONTACTS OPEN | External multi-unit cycling contacts opened. | The Multiunit Cycling contacts connected to I/O Board TB4-9 have opened to initiate a cycling shutdown. If the chiller is running when this occurs, the Pre-rotation Vanes are driven fully closed prior to shutting down the chiller. | The chiller will automatically restart when the contacts close. | 120 |
| SYSTEM CYCLING – CONTACTS OPEN | External system cycling contacts opened. | The System Cycling contacts connected to I/O Board TB4-13 have opened to initiate a cycling shutdown. If the chiller is running when this occurs, the Pre-rotation Vanes are driven fully closed prior to shutting down the chiller. | The chiller will automatically restart when the contacts close. | 121 |
| VSD – DC BUS PRE-REGULATION | DC link failed to reach the regulated setpoint after boost control was enabled. | The dc link voltage has not attained within ±50 V of the DC link voltage setpoint defined by the motor and line voltages (750 V for YMC2) within 2 seconds after the boost rectifier’s closed loop control has been enabled. The VSD logic board shall disable boost rectifier’s IGBT gating signals during this fault. | The VSD logic board shall time 10 seconds before clearing the fault and allowing another pre-charge to start; the VFD’s fan(s) and water pump(s) remain energized during this time. Up to three consecutive pre-charge-related or pre-regulation-related faults are allowed; after the third, Safety Shutdown message VSD – DC BUS PRE-REGULATION LOCKOUT is generated. | 121 |
| VSD – HIGH DC BUS VOLTAGE | DC link over-voltage. | The VSD’s DC link voltage is continuously monitored and if the level exceeds 878 VDC, ±28 VDC a Bus Over-Voltage shutdown is initiated. Look at the level of the 460 VAC applied to the drive; the specified voltage range is 414 VAC to 508 VAC. | If the incoming voltage is in excess of 508 VAC, steps should be taken to reduce the voltage to within the specified limits. | 121 |
| VSD – HIGH INTERNAL AMBIENT TEMPERATURE | VSD enclosure ambient overtemperature. | Generated when the higher of the two internal ambient temperature inputs exceeds a high limit of 158°F (70°C). Potential causes: internal VSD fan failure, VSD water pump failure, entering condenser water temperature higher than design, condenser water flow lower than required, fouled VSD heat exchanger, or restriction of condenser water to the VSD. | The unit’s fan(s) and water pump(s) remain energized until the internal temperature drops below 148°F (64°C), after which they shall be de-energized and the fault can be cleared. | 121 |
| VSD – HIGH PHASE A INPUT CURRENT | Input phase A instantaneous overcurrent. | Phase A input current exceeded the value listed for a given model of drive (490: 886 A; 0490A: 942 A; 744: 1446 A). The three input currents are monitored with Hall-effect current sensors, and their instantaneous values compared to the limit. | If three high input current cycling shutdown faults occur on any phase within 90 minutes, the third fault in the 90 minute period causes a Safety Shutdown; the chiller can then be restarted after the CLEAR FAULTS button is pressed. | 121 |
| VSD – HIGH PHASE B INPUT CURRENT | Input phase B instantaneous overcurrent. | See the previous VSD – HIGH PHASE A INPUT CURRENT message (limits: 490: 886 A; 0490A: 942 A; 744: 1446 A). | If three high input current cycling shutdown faults occur on any phase within 90 minutes, the third causes a Safety Shutdown; restart after the CLEAR FAULTS button is pressed. | 121 |
| VSD – HIGH PHASE C INPUT CURRENT | Input phase C instantaneous overcurrent. | See the previous VSD – HIGH PHASE A INPUT CURRENT message (limits: 490: 886 A; 0490A: 942 A; 744: 1446 A). | If three high input current cycling shutdown faults occur on any phase within 90 minutes, the third causes a Safety Shutdown; restart after the CLEAR FAULTS button is pressed. | 121 |
| VSD – HIGH PHASE A MOTOR CURRENT | Motor phase A instantaneous overcurrent. | Phase A motor current exceeded the value listed for a given model of drive (490, 0490A: 776 Amps; 744: 1086 Amps). The three motor currents are monitored with Hall-effect current sensors, and their instantaneous values compared to the limit. | If three high motor current cycling shutdown faults occur on any phase within 90 minutes, the third fault in the 90 minute period causes a Safety Shutdown; the chiller can then be restarted after the CLEAR FAULTS button is pressed. | 121 |
| VSD – HIGH PHASE B MOTOR CURRENT | Motor phase B instantaneous overcurrent. | See the previous VSD – HIGH PHASE A MOTOR CURRENT message (limits: 490, 0490A: 776 Amps; 744: 1086 Amps). | If three high motor current cycling shutdown faults occur on any phase within 90 minutes, the third causes a Safety Shutdown; restart after the CLEAR FAULTS button is pressed. | 122 |
| VSD – HIGH PHASE C MOTOR CURRENT | Motor phase C instantaneous overcurrent. | See the previous VSD – HIGH PHASE A MOTOR CURRENT message (limits: 490, 0490A: 776 Amps; 744: 1086 Amps). | If three high motor current cycling shutdown faults occur on any phase within 90 minutes, the third causes a Safety Shutdown; restart after the CLEAR FAULTS button is pressed. | 122 |
| VSD INITIALIZATION FAILED | VSD boards failed power-up initialization. | Upon application of power, all boards go through the initialization process. Causes of unsuccessful initialization: the control center and the VSD must be energized at the same time (pulling the fuse in the control center creates a problem; power-up must be accomplished by closing the main disconnect on the VSD cabinet with all fuses in place; a power interruption to the VSD Logic board will also generate this message); the Eproms must be of the correct version for each VSD board and installed correctly (created as a set, cannot be interchanged between earlier and later versions); serial data communications must be established (refer to VSD – Serial Communications fault). | Serial communications can be verified by selecting the VSD DETAILS screen from the MOTOR screen and observing the Full Load Amps value; a zero displayed for this and other VSD parameters indicates a serial communications link problem. | 122 |
| VSD – LOGIC BOARD POWER SUPPLY | VSD logic board low-voltage supplies out of limits. | Generated by the VSD logic board; indicates that the low voltage power supplies for the logic boards have dropped below their allowable operating limits. The supplies are derived from the secondary of the 120 VAC to 24 VAC transformer, which in turn is derived from the 480 VAC to 120 VAC control power transformer. This message usually means the power to the VSD has been removed. | The chiller will automatically restart when the cycling condition clears. | 122 |
| VSD – LOGIC BOARD PROCESSOR | Communication failure between the two VSD logic board microprocessors. | Generated if a communications problem occurs between the two microprocessors on the VSD Logic Board. | The chiller will automatically restart when the cycling condition clears. | 122 |
| VSD – LOW DC BUS VOLTAGE | DC link under-voltage after successful pre-charge. | Following a successful DC-link pre-charge and pre-regulation, the DC-link under-voltage shutdown is generated when the dc link voltage falls below the trip level for 10 ms. The trip level is set to 720 VDC (30 VDC below the calculated DC link voltage setpoint of 750 VDC for both 60 Hz and 50 Hz units). | The chiller will automatically restart when the cycling condition clears. | 122 |
| VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE | Input rectifier phase A IGBT module too cold. | The temperature of the IGBT module of the input rectifier’s phase A has decreased below the low limit of 37°F (2.7°C). | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. | 122 |
| VSD – LOW PHASE B INPUT BASEPLATE TEMPERATURE | Input rectifier phase B IGBT module too cold. | See the previous VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE message. | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. | 122 |
| VSD – LOW PHASE C INPUT BASEPLATE TEMPERATURE | Input rectifier phase C IGBT module too cold. | See the previous VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE message. | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. | 122 |
| VSD – LOW PHASE A MOTOR BASEPLATE TEMPERATURE | Inverter phase A IGBT module too cold. | The temperature of the IGBT module of the inverter’s phase A has decreased below the low limit of 37°F (2.7°C). | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. | 122 |
| VSD – LOW PHASE B MOTOR BASEPLATE TEMPERATURE | Inverter phase B IGBT module too cold. | See the previous VSD – LOW PHASE A MOTOR BASEPLATE TEMPERATURE message. | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. | 122 |
| VSD – LOW PHASE C MOTOR BASEPLATE TEMPERATURE | Inverter phase C IGBT module too cold. | See the previous VSD – LOW PHASE A MOTOR BASEPLATE TEMPERATURE message. | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. | 122 |
| VSD – NOT RUNNING | VSD not reporting run state while a run command is issued. | The VSD has not reported run state via serial communications for 8 seconds while the microboard issues a VSD run command. | The fault is released when the microboard command is Stopped State. | 122 |
| VSD – PHASE A INPUT DCCT OFFSET | Input DCCT offset out of range at pre-charge initiation. | Upon the assertion of a precharge command, the output voltage of each of the DCCTs which sense the input current will be monitored. The first value of each output voltage is compared against an offset threshold level of ±24.4 mV; if this threshold level is not exceeded, an average of eight readings on each DCCT output is taken and used for DCCT offset compensation. If the offset threshold at initialization exceeded this threshold, this shutdown is generated. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PHASE B INPUT DCCT OFFSET | Input DCCT offset out of range at pre-charge initiation. | See the previous VSD – PHASE A INPUT DCCT OFFSET message. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PHASE C INPUT DCCT OFFSET | Input DCCT offset out of range at pre-charge initiation. | See the previous VSD – PHASE A INPUT DCCT OFFSET message. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PHASE A INPUT GATE DRIVER | Boost rectifier phase A gate driver fault. | The VSD boost rectifier’s IGBT gate driver boards monitor their power supply voltages, as well as the saturation voltage drop across each main IGBT while turned on. If a voltage on the Phase A boost rectifier IGBT gate driver board falls out of the prescribed limit, the gate driver board shall turn the rectifier’s IGBTs off and send this shutdown. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PHASE B INPUT GATE DRIVER | Boost rectifier phase B gate driver fault. | See the previous VSD – PHASE A INPUT GATE DRIVER message. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PHASE C INPUT GATE DRIVER | Boost rectifier phase C gate driver fault. | See the previous VSD – PHASE A INPUT GATE DRIVER message. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PHASE A MOTOR GATE DRIVER | Inverter phase A gate driver fault. | The VSD inverter’s IGBT gate driver boards monitor their power supply voltages, as well as the saturation voltage drop across each IGBT while turned on. If a voltage on the Phase A gate driver board exceeds the prescribed limit, the gate driver board shall turn the inverter’s IGBTs off and send this shutdown. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PHASE B MOTOR GATE DRIVER | Inverter phase B gate driver fault. | See the previous VSD – PHASE A MOTOR GATE DRIVER message. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PHASE C MOTOR GATE DRIVER | Inverter phase C gate driver fault. | See the previous VSD – PHASE A MOTOR GATE DRIVER message. | The chiller will automatically restart when the cycling condition clears. | 123 |
| VSD – PRECHARGE – LOW DC BUS VOLTAGE 1 | DC bus did not reach the low pre-charge threshold in time. | During pre-charge, the DC-link voltage must reach at least the low threshold, which is determined by Line Voltage Setpoint (460 V: 50 V; 380/415 V: 41 V; 230 V: 25 V) within 4 seconds after the pre-charge signal has been commanded. If this condition is not met, this shutdown is generated. | The VSD logic board shall time 10 seconds before clearing the fault and allowing another pre-charge to start; the VFD’s fan(s) and water pump(s) remain energized during this time. Up to three consecutive pre-charge-related faults are allowed; after the third, Safety Shutdown message VSD – PRECHARGE LOCKOUT is generated. | 123 |
| VSD – PRECHARGE – LOW DC BUS VOLTAGE 2 | DC bus did not reach the high pre-charge threshold in time. | During Pre-charge, the DC-link voltage must reach at least the high threshold which is determined by Line Voltage Setpoint (460 V: 500 V; 380/415 V: 414 V; 230 V: 250 V) within 15 seconds after the pre-charge signal has been commanded. If this condition is not met, this shutdown is generated. | The VSD logic board shall time 10 seconds before clearing the fault and allowing another pre-charge to start; the VFD’s fan(s) and water pump(s) remain energized during this time. Up to three consecutive pre-charge-related faults are allowed; after the third, Safety Shutdown message VSD – PRECHARGE LOCKOUT is generated. | 123 |
| VSD – RUN SIGNAL | Redundant run commands not both received within 5 seconds. | Redundant RUN signals are generated by the control center; one via TB6-24 and the second via the Serial Communications link. Upon receipt of either of the two RUN commands by the VSD, a 5 second timer shall commence timing. If both run commands are not received by the VSD Logic Board within 5 seconds, a shutdown is performed. Generally indicative of a wiring problem between the control center and the VSD. | The chiller will automatically restart when the cycling condition clears. | 124 |
| VSD – SERIAL COMMUNICATIONS | No response from the VSD logic board over three consecutive attempts. | Generated by OptiView when communications between the control center Microboard and the VSD Logic Board causes no response over three attempts consecutively. Generally indicative of defective wiring between 2TB on the VSD Logic Board and the Microboard J13. | The chiller will automatically restart when the cycling condition clears. | 124 |
| VSD – SERIAL RECEIVE | VSD not receiving valid communication from the control panel. | The VSD logic board does not receive valid communication from the control panel for 10 consecutive seconds. | The chiller will automatically restart when the cycling condition clears. | 124 |
| VSD SHUTDOWN – REQUESTING FAULT DATA | VSD shut the chiller down; cause not yet received over the serial link. | The VSD has shutdown the chiller and the control center has not yet received the cause of the fault from the VSD, via the serial communications link. The VSD shuts down the chiller by opening the Motor Controller VSD Stop Contacts (located on the VSD Logic Board and connected between TB6-16 and TB6-53 in the control center). Because serial communications are initiated every 2 seconds, this message appears for a few seconds. | Then replaced with one of the other VSD fault messages. | 124 |
| VSD – SINGLE PHASE INPUT POWER | One line-to-line input voltage fell below 200 Vrms. | The VSD monitors the RMS value of each of the three line-to-line voltages on a cycle-by-cycle basis. If the RMS value of any one of the three line-to-line voltages falls below 200 Vrms in any one cycle, this shutdown is generated. | The chiller will automatically restart when the cycling condition clears. | 124 |
| VSD – STOP (FAULT) CONTACTS OPEN | VSD fault cause not received within 20 seconds. | See the previous VSD Shutdown – Requesting Fault Data message. If the control center’s microboard does not receive the cause of the fault over the Serial Link within 20 seconds, it is assumed it is not forthcoming and that message is replaced with VSD STOP CONTACTS OPEN message. | The chiller will automatically restart when the cycling condition clears. | 124 |
Safety shutdown messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| AUXILIARY SAFETY – CONTACTS CLOSED | User-defined auxiliary safety input tripped. | The Auxiliary Safety shutdown input, connected to I/O Board TB4-31 senses 115 VAC, initiating a safety shutdown. This input is a general-purpose, user-defined safety shutdown input. | The chiller can be started after the contacts open and the CLEAR FAULT button is pressed. | 125 |
| CONDENSER – HIGH PRESSURE CONTACTS OPEN | Electromechanical high pressure safety switch tripped. | The contacts of the electromechanical high pressure safety device, located on the condenser shell, have opened because this device has detected a pressure greater than 204±7 psig. The contacts will automatically close when the condenser pressure decreases to is less than 160±10 psig. | The chiller can be started after the contacts close and the CLEAR FAULT button is pressed. | 125 |
| CONDENSER – PRESSURE TRANSDUCER OUT OF RANGE | Condenser pressure transducer signal outside its valid range. | The Condenser Pressure Transducer indicates a pressure that is less than 6.8 psig or greater than 300.0 psig. This is outside the normal operating range of the transducer. This generally indicates a defective transducer. | The chiller can be started after the transducer is indicating a pressure that is within range and the CLEAR FAULT button is pressed. | 125 |
| CONTROL PANEL – POWER FAILURE | Control power failure (safety version when displayed in red). | A Control Power failure has occurred. This message can indicate a Cycling (auto-restart after power failure) or Safety (manual restart after power failure) shutdown, depending upon control center configuration. It indicates a cycling shutdown when displayed in orange characters; Safety shutdown when displayed in red characters. | If the power failure occurred while the chiller was running, it will automatically restart when power is restored. Auto-restart or manual restart is configured by a qualified Service Technician following instructions in YORK YMC2 Service Manual (Form 160.78-M2). | 125 |
| DISCHARGE – LOW TEMPERATURE | Discharge temperature below 30°F. | The discharge temperature, as sensed by the Discharge Temperature Thermistor, has decreased to less than 30.0°F (-1.1°C). | The chiller can be started after the temperature increases to greater than 30.0°F (-1.1°C) and the CLEAR FAULT button is pressed. | 125 |
| EVAPORATOR – LOW PRESSURE | Third evaporator low-pressure cycling shutdown within 90 minutes. | The evaporator pressure, as sensed by the Evaporator Transducer, has decreased to the shutdown threshold and caused cycling shutdown three times in a 90 minute period. For water cooling applications the shutdown threshold is a fixed value; for Brine cooling applications it varies according to the concentration of the Brine solution and is programmed at the YORK Factory (not to be changed except by a qualified Service Technician per Form 160.78-M2). Shutdown/reset thresholds (psig): R-134a 26.1 / 26.2 (water), 6.0–30.0 as programmed / 0.1 > shutdown threshold (brine); R-513A 30.2 / 30.2, 8.8–34.4 / 0.1 >; R-1234ze 15.4 / 15.5, 0.4–18.4 / 0.1 >; R-515B 15.2 / 15.3, 0.3–18.2 / 0.1 >. | The chiller can be started after the evaporator pressure increases to the restart threshold and the CLEAR FAULT button is pressed. | 126 |
| EVAPORATOR – LOW PRESSURE – SMART FREEZE | Smart Freeze protection timed out with the evaporator below the freeze threshold. | Smart Freeze protection is activated and has shutdown the chiller because the evaporator temperature has been below the Smart Freeze threshold for greater than the allowable number of seconds. If sensor RT7 is Enabled the freeze threshold is 32.8°F (0.4°C); if RT7 is not enabled the evaporator refrigerant temperature used is the Evaporator Saturation Temperature and the freeze threshold is 34.0°F (1.1°C). The total count is incremented once for every second the evaporator refrigerant temperature is below the freeze threshold; # seconds to freezing = (4053.7) / (freeze threshold – evap. refrigerant temp.). Smart Freeze is activated only if the feature has been enabled by a Service technician and the Leaving Chilled Liquid temperature Setpoint is less than 38.0°F (3.3°C). | 126 | |
| EVAPORATOR – TRANSDUCER OR LEAVING LIQUID PROBE | Evaporator pressure and leaving chilled liquid readings inconsistent — probable transducer or thermistor defect. | A possible defective Evaporator pressure Transducer or Leaving Chilled Liquid temperature Thermistor has been detected. The control center converts the evaporator pressure to a Saturated Temperature value and compares it to the Leaving Chilled Liquid temperature; the difference should not be outside the range of 2.5°F (1.4°C) to 25.0°F (13.9°C). To initiate a shutdown, the difference must be outside the acceptable range continuously for 10 minutes. | The chiller can be started after the CLEAR FAULT button is pressed. | 126 |
| EVAPORATOR – TRANSDUCER OR TEMPERATURE SENSOR | Evaporator pressure and refrigerant temperature readings inconsistent — probable sensor defect. | A possible defective Evaporator pressure Transducer or Refrigerant Temperature Sensor has been detected. The difference between the evaporator saturated temperature and the optional Evaporator Refrigerant Temperature Sensor greater than 3.0°F (1.7°C), continuously for 1 minute, performs this shutdown. Check performed only if: chiller running at least 10 minutes; RT7 enabled by a Service technician; NOT in Brine cooling mode; Smart Freeze is enabled; and RT7 or Evaporator Saturation Temperature indicating less than 32.0°F (0°C). | The chiller can be started after the temperatures are within 3.0°F (1.7°C) of one another and the CLEAR FAULT button is pressed. | 127 |
| MBC – CABLE FAULT | Supervisory jumper continuity lost in a main cable assembly. | Set when the MBC does not detect continuity expected through a set of supervisory pins through an embedded jumper in either of the two main electrical cable assemblies. The MBC ESD Fault contacts open; the MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the connector to cable supervisory jumper continuity is restored. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 127 |
| MBC – CUSTOMER SERIAL LINK DISABLED | MBC serial setting changed away from panel control. | Set when the MBC Local/Remote Modbus command is not reported from the MBC as set for panel control. This would be caused if the MBC were accessed via a computer using diagnostic software and the serial communication setting then changed in the Remote Command tab from Customer Serial Link to another choice. | The chiller can be started when the MBC setting is restored to Customer Serial Link using the diagnostic software according to Form 160.78-M1 and the OptiView panel CLEAR FAULTS button is pressed. | 127 |
| MBC – DATA ACQUISITION FAULT | Internal communication problem on the AMB control board. | Set when the MBC detects an internal communication problem on the AMB control board. The MBC ESD Fault contacts open; the MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the MBC recognizes proper internal communication after a reboot. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULT button is pressed. | 127 |
| MBC – DSP COMMUNICATION | Communication error across circuit boards in the MBC. | Set when the MBC control board detects a communication error across circuit boards in the MBC. The MBC ESD Fault contacts open; the MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the board-level communication failure is resolved. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 127 |
| MBC – DSP INITIALIZATION | MBC control board software failed to initialize. | Set when the MBC control board software fails to initialize. The MBC is determining software parameters are not correct. The MBC ESD Fault contacts open; the MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | The condition may require reloading the control parameters to the control. Released on a successful re-boot. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 127 |
| MBC – DSP INTEGRITY | Internal problem on the AMB control board. | Set when an internal problem occurs on the AMB control board. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the board-level communication failure is resolved. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 128 |
| MBC – DSP WATCHDOG | Lapse in MBC microprocessor activity detected by the watchdog. | Set when the MBC determines a lapse in internal microprocessor activity through its Watchdog device. The MBC Watchdog Fault contacts open. The MBC will not react to a levitation mode change command via serial comms and remains in the levitation mode it was in when the fault occurred until power is removed; power is automatically removed when the VSD is stopped and the precharge command ceases so the DS bus, which powers the MBC, depletes. | The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 128 |
| MBC – EEPROM | Data discrepancy with the EPROM on the AMB control board. | Set when a data discrepancy occurs with the EPROM on the AMB control board. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the board-level communication failure is resolved. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 128 |
| MBC – EXCESSIVE SHUTDOWNS | Three MBC cycling shutdowns within 15 minutes. | Set if three MBC Cycling Shutdowns occur in a 15 minute window. The 15 minute window begins with the first MBC fault. | Released when all MBC faults clear. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 128 |
| MBC – FLASH MEMORY CLEAR | Internal problem with the memory chip on the AMB control board. | Set when an internal problem occurs with the memory chip on the AMB control board. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the board-level communication failure is resolved. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 128 |
| MBC – FLASH MEMORY WRITE | Internal problem with the memory chip on the AMB control board. | Set when an internal problem occurs with the memory chip on the AMB control board. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the board-level communication failure is resolved. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 128 |
| MBC – HIGH AMPLIFIER TEMPERATURE | MBC amplifier overtemperature (safety level). | Set when the MBC amplifier temperature exceeds 176ºF (80ºC) for 2 seconds continuous. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until the VSD rotation signal indicates less than 10 Hz; then the MBC de-levitates the rotor. | Released when amplifier temperature drops 5.4ºF (3.0ºC) below the trip value. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 128 |
| MBC – HIGH BEARING CURRENT | Magnetic bearing excitation current above the power amplifier rating. | Set when the MBC has determined any of the driveline Magnetic Bearing excitation currents exceeds the maximum Power Amplifier rating, programmed at 4 A, for 10 seconds continuous. The MBC ESD Fault contacts open. The MBC remains in Levitation mode attempting to keep the motor shaft levitated until the VSD rotation signal indicates greater than 10 Hz. | Released when all of the bearing currents are less than 4 A. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 128 |
| MBC – HIGH BEARING Z1 TEMPERATURE | Impeller-end axial bearing overtemperature. | Set when the MBC detects a temperature greater than 266ºF (130ºC) on the impeller end axial magnetic bearing. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until the VSD rotation signal indicates is less than 10 Hz. | Released when temperature is less than 266ºF (130ºC). The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 129 |
| MBC – HIGH BEARING Z2 TEMPERATURE | Opposite-impeller-end axial bearing overtemperature. | Set when the MBC detects a temperature greater than 266ºF (130ºC) on the opposite-impeller end axial magnetic bearing. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until the VSD rotation signal indicates is less than 10 Hz. | Released when temperature is less than 266ºF (130ºC). The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 129 |
| MBC – HIGH DC/DC TEMPERATURE | MBC DC/DC converter overtemperature (safety level). | Set when the MBC DC/DC Converter board temperature exceeds 203ºF (95ºC) for 2 seconds continuous. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until the VSD rotation signal indicates is less than 10 Hz; then the MBC de-levitates the rotor. | Released when the DC/DC converter temperature drops 5.4ºF (3ºC) below the trip value. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 129 |
| MBC – NO LEVITATION | Levitation commanded but the Rotation Allowed input is not high. | Set when OptiView software is commanding MBC Levitation Mode ON but the Rotation Allowed digital input from the MBC contacts is not reading high. This fault is inhibited if no VSD DC Bus Voltage is present and during the first 15 seconds after the Levitation Mode ON command is sent. | Released when the chiller is stopped. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 129 |
| MBC – OSCILLATOR FAULT | Position sensor oscillator overloaded. | Set when the MBC has determined either the radial or axial position sensor internal Oscillator, which drives the position sensor coils, is overloaded for 1 second continuous. This is a result of an open or short in the connection to the shaft position sensors or a failure on the board. LED V1 or V2 illuminated on the oscillator board indicates a failure with radial position or elongation channels; LED V3 or V4 illuminated indicates a failure with the axial position. The MBC ESD Fault contacts open. | Released when the Oscillator voltage drop is normal. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 129 |
| MBC – OVERSPEED FAULT | Rotor speed above the 458 Hz setpoint. | Set when the MBC determines the rotor speed exceeds the programmed setpoint of 458 Hz for 0.1 seconds continuous. Rotor speed is transmitted to the MBC from the VSD. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the speed signal no longer exceeds the setpoint, which should occur when the chiller is stopped. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 129 |
| MBC – POWER SUPPLY FAULT | Power supply board overload or abnormal DC/DC converter voltage. | Set when the MBC detects overload on the Wide Input Range power supply board or indicates abnormal voltage at the DC/DC converter. The Wide Input Range power supply board overload is detected by monitoring temperature at the transformer. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when voltage is restored. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 129 |
| MBC – ROTOR ELONGATION | Axial displacement difference above the interpolated limit. | Set when the MBC has calculated the algebraic difference between the displacement at shaft impeller end axial position sensor and the shaft opposite-impeller end axial position sensor is greater than the value calculated by linear interpolation between 300 µm at 436 Hz to 350 µm at zero Hz. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the difference in displacements no longer exceeds these values. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 130 |
| MBC – SPEED SIGNAL FAULT | Third MBC speed signal cycling fault within 90 minutes. | Set when the MBC has the speed signal cycling fault three times in a 90-minute window. The window is started when not currently in a window and a MBC Speed Signal cycling fault is received. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC buss power depletes. | Released when the transmission is reestablished. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 130 |
| SAFETY STOP | Panel safety stop pushbutton depressed. | Set when the panel safety stop hardware pushbutton is depressed, removing input from the I/O Board terminal TB3-28 for >500 msec. continuous. It also sets the local command to STOP. | The chiller can be started when the pushbutton is released and the OptiView panel CLEAR FAULTS button is pressed. | 130 |
| MBC – STARTUP FAILURE | Third MBC startup failure within 90 minutes. | Set when the chiller initiates three MBC-STARTUP FAILURE Cycling Shutdown in a 90 minute period. | Refer to YORK YMC2 Service Manual (Form 160.78-M2) for conditions necessary to complete MBC startup successfully. Check fault history details to determine which specific conditions were not met. | 130 |
| MBC – UNAUTHORIZED ROTATION | Rotor speed signal present while Levitation Mode is not activated. | Set when the MBC detects a rotor speed signal from the VSD while the Levitation Mode is not activated. The MBC ESD Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms or VSD DC bus power depletes. | Released when the MBC Levitation or Rotation mode is activated or the VSD speed signal indicates no shaft rotation. The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 130 |
| MOTOR – HIGH WINDING TEMPERATURE | Motor winding temperature above the shutdown threshold. | Occurs when either of the following conditions are present: any of the enabled motor winding temperatures exceeded the programmed High Winding Temperature Shutdown Threshold of 302˚F (150˚C); or the Average Winding Temperature has exceeded the programmed High Winding Temperature Shutdown threshold for 3 continuous seconds. | The chiller can be started after all winding temperatures decreased to at least 18˚F (10˚C) below the shutdown threshold and the COMPRESSOR is stopped. The safety shutdown will not act on any individual winding temperature sensor that has been disabled with the TEMPERATURE DISABLE Setpoint on the Motor Details Screen. | 130 |
| MOTOR – HIGH HOUSING TEMPERATURE | Motor housing temperature at or above 185°F. | Set when Motor Housing Temperature is greater than or equal to 185°F (85°C). | Fault is released when Motor Housing Temperature is less than 158°F (70°C). The chiller can be started when the condition is released and the OptiView panel CLEAR FAULTS button is pressed. | 130 |
| SALES ORDER - INVALID COMPRESSOR MODEL | Compressor Model field does not conform to the required format. | Set when the Compressor Model field entered on the Setpoints – Setup – Sales Order screen does not conform to the format expected (data found on the compressor nameplate). Initiated if any of the following are true: MOTOR is anything other than M1; MOTOR REV is anything other than ‘B’; character other than ‘-‘ between position 3 and 4; SS/LS IMP DIAM is anything other than 164, 174, 186, 197 or 205; SS/LS ROTATION is anything other than ‘F’; SS/LS IMP REV is anything other than a character ‘A’ through ‘Z’; SS/LS FLOW REV is anything other than a character ‘A’ through ‘B’. | The fault released when none of the above statements are true. Then the CLEAR FAULTS button on the Home screen can be pressed and the chiller started. | 131 |
| SURGE PROTECTION – EXCESS SURGE | Surge count exceeded the limit with shutdown enabled. | (Applies only if Surge Protection SHUTDOWN feature is Enabled.) The Surge Window Count surge events exceeded the Count Limit setpoint. The chiller shuts down as soon as the count exceeds the limit. | The chiller can be started after the CLEAR FAULT button is pressed. | 131 |
| WATCHDOG – SOFTWARE REBOOT | Microboard software watchdog reset the processor. | The Microboard’s software Watchdog initiated a Microprocessor reset because it detected that a portion of the chiller operating Program was not being executed. The result of this reset is a Safety shutdown and re-initialization of the Program. Generally indicative of a severe electrical power disturbance or impending Microboard Failure. | The chiller can be started after the COMPRESSOR switch is placed in the Stop-Reset (O) position. | 131 |
| VSD – DC BUS LOCKOUT – DO NOT CYCLE POWER | DC bus voltage present while the unit is stopped with no energize command. | When the unit is stopped in a mode where no command exists to energize the DC bus, the DC bus voltage is monitored and checked against a threshold level of 50V every five minutes. If the DC bus voltage is higher than the threshold value, this shutdown is generated. | When the condition clears and VSD input modules tested and determined acceptable the chiller can be started after the CLEAR FAULTS button is pressed. | 131 |
| VSD – DC BUS PRE-REGULATION LOCKOUT | Third consecutive pre-charge/pre-regulation fault. | If the unit fails to complete pre-regulation due to VSD – DC BUS PRE-REGULATION fault, it must repeat pre-charge in order to attempt another pre-regulation. The VSD logic board waits 10 seconds before clearing the DC-link voltage pre-regulation fault and allowing another pre-charge to start; the unit’s fan(s) and water pump(s) remain energized during this wait time. Up to three consecutive pre-charge-related or pre-regulation-related faults are allowed; after the third consecutive fault, this shutdown is generated. The VSD logic board disables boost rectifier’s IGBT gating signals if the third fault occurred during pre-regulation. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 131 |
| VSD – GROUND FAULT | Ground fault current above the shutdown value. | Generated when the sum of the three phases of instantaneous input current values are greater than the shutdown value for a period of 1 second for the given model of drive (490, 0490A: 40 Amps; 744: 120 Amps). | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 132 |
| VSD – HIGH PHASE A INPUT BASEPLATE TEMPERATURE | Input rectifier phase A baseplate overtemperature. | The Input Baseplate Temperature exceeded the shutdown value for the given model of drive (490, 0490A: 190°F / 87.8°C; 744: 170°F / 76.6°C). After the unit trips, the VSD fan(s) and water pump(s) shall remain energized until the temperatures of all three rectifier’s phases drop below the fault-reset threshold of 165°F (73.8°C). In April of 2016 the shutdown control for the fan(s) and pump(s) was changed to keep the fan(s) and pump(s) running for 2 minutes after the fault occurred (software version C.HYP.03.04.01, and C.HYP.04.04.01); when this happens, the unit’s fan(s) and water pumps shall be de-energized. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 132 |
| VSD – HIGH PHASE B INPUT BASEPLATE TEMPERATURE | Input rectifier phase B baseplate overtemperature. | See the previous VSD – HIGH PHASE A INPUT BASEPLATE TEMPERATURE message. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 132 |
| VSD – HIGH PHASE C INPUT BASEPLATE TEMPERATURE | Input rectifier phase C baseplate overtemperature. | See the previous VSD – HIGH PHASE A INPUT BASEPLATE TEMPERATURE message. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 132 |
| VSD – HIGH PHASE A MOTOR BASEPLATE TEMPERATURE | Motor baseplate overtemperature (phase A). | The chiller has shutdown because the motor baseplate temperature exceeded the high limit of 190°F (87.7°C). After the unit trips, the VSD fan(s) and water pump(s) shall remain energized until the motor baseplate temperatures of all phases drop below the fault-reset threshold of 165°F (73.8°C). In April of 2016 the shutdown control for the fan(s) and pump(s) was changed to keep the fan(s) and pump(s) running for 2 minutes after the fault occurred (software version C.HYP.03.04.01, and C.HYP.04.04.01); when this happens, the unit’s fan(s) and water pump(s) shall be de-energized. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 132 |
| VSD – HIGH PHASE B MOTOR BASEPLATE TEMPERATURE | Motor baseplate overtemperature (phase B). | See the previous VSD – HIGH PHASE A MOTOR BASEPLATE TEMPERATURE message. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 132 |
| VSD – HIGH PHASE C MOTOR BASEPLATE TEMPERATURE | Motor baseplate overtemperature (phase C). | See the previous VSD – HIGH PHASE A MOTOR BASEPLATE TEMPERATURE message. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 132 |
| VSD – HIGH TOTAL DEMAND DISTORTION | Input current TDD above 25%. | Indicates the input current to the VSD is not sinusoidal. Occurs if the TDD exceeds 25% continuously for 45 seconds. TDD (Total Demand Distortion) is defined by IEEE Std 519-1992 as the total root-sum-square harmonic current distortion, in percent of the maximum demand load current (15 or 30 min demand). The displayed TDD is the total RMS value of all the harmonic current supplied by the main power to the VSD divided by the chiller Full Load Amps, in percent. | The chiller can be started after the CLEAR FAULT button is pressed. | 132 |
| VSD – INVERTER PROGRAM FAULT | Inverter internal code exception. | When some internal code exception of Inverter happens such as divide-by-zero, out-of-range parameter, for example, the unit shall trip and the HYP logic board shall indicate the inverter program fault and the error information including module number and line number via the communications link. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 132 |
| VSD – INPUT CURRENT OVERLOAD | Input RMS current above the 116.7% threshold for 10 seconds. | The highest of the three input RMS currents is monitored and compared against 105% of the job input current at 90% line voltage. Because the job input current setting is at nominal line voltage and this fault is based on power, and accounts for low-tolerance line voltage, its threshold is 105%/90%=116.7%. If this value is exceeded continuously for 10 seconds, this shutdown is generated. The 10 s timer is reset if three consecutive RMS current values fall below the overload threshold. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 133 |
| VSD – INPUT DCCT OFFSET LOCKOUT | Three consecutive input DCCT offset cycling faults. | If three consecutive VSD – Phase A, B or C Input DCCT Offset cycling faults occur, this safety shutdown is generated to require investigation and manual reset. | When the condition clears and VSD input modules determined acceptable, the chiller can be started after the CLEAR FAULTS button is pressed. | 133 |
| VSD – LOGIC BOARD PLUG | Rectifier or inverter DCCT plug not installed. | A jumper is located in the rectifier and inverter DCCT plugs to feedback a digital signal to indicate if the plugs are installed or not. If either plug is not installed, a low value is read on the digital input causing the unit to trip, and this shutdown is generated. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 133 |
| VSD – MOTOR CURRENT IMBALANCE | Motor phase current imbalance above 30%. | The three phase compressor motor current imbalance was greater than 30% continuously for 45 seconds. The imbalance is not checked until the chiller has been running for at least 45 seconds and the average of the three phases of motor current is greater than 80% of the programmed 100% chiller Full Load Amps. The Variable Speed Drive detects the unbalance condition and advise the OptiView Control Center Microboard via serial communications. | The chiller can be started after the CLEAR faults button is pressed. | 133 |
| VSD – 105% MOTOR CURRENT OVERLOAD | Motor RMS current above 105% of the 525 A limit for 40 seconds. | The highest of the three motor RMS currents is monitored and compared against 105% of the motor current limit of 525 A. If this value is exceeded continuously for 40 seconds, this shutdown is generated. The 40 second timer shall reset if three consecutive RMS current values fall below the overload threshold. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 133 |
| VSD – MOTOR CURRENT THD FAULT | Motor current THD above limit. | Motor current (inverter output) total harmonic distortion (THD) level is exceed. The fault is based on a fixed value of measured harmonic current from the inverter. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 133 |
| VSD – PHASE A INPUT DCCT | Input phase A current below the minimum during precharge. | The input current in each phase to the VSD is measured during the precharge time. If the input current does not exceed the shutdown value for the given model of drive (0490A, 490: 5.0 amps; 744: 15.0 amps), then this shutdown is generated. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 133 |
| VSD – PHASE B INPUT DCCT | Input phase B current below the minimum during precharge. | See the previous VSD –PHASE A INPUT DCCT message. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 133 |
| VSD – PHASE C INPUT DCCT | Input phase C current below the minimum during precharge. | See the previous VSD –PHASE A INPUT DCCT message. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 133 |
| VSD – PHASE A MOTOR DCCT | Motor phase A DCCT cable/current check failed. | This shutdown determines if the cable at the motor DCCT is connected. This shutdown is generated 1.5 seconds after the motor run command if the motor current does not exceed 25 A. | 133 | |
| VSD – PHASE B MOTOR DCCT | Motor phase B DCCT cable/current check failed. | See the previous VSD –PHASE A MOTOR DCCT message. | 133 | |
| VSD – PHASE C MOTOR DCCT | Motor phase C DCCT cable/current check failed. | See the previous VSD –PHASE A MOTOR DCCT message. | 133 | |
| VSD – PRECHARGE LOCKOUT | Third consecutive pre-charge fault. | If the unit fails to complete pre-charge (due to VSD – PRECHARGE – LOW DC BUS VOLTAGE or VSD – PRECHARGE – HIGH DC BUS VOLTAGE), the VSD logic board shall time 10 seconds before clearing the fault and allowing another pre-charge to start. The unit’s fan(s) and water pump(s) shall remain energized during this time. The VSD logic board shall allow up to three consecutive pre-charge-related faults to occur. After the third consecutive pre-charge-related fault, this shutdown is generated. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 134 |
| VSD – RECTIFIER PROGRAM FAULT | Rectifier internal code exception. | When some internal code exception of Rectifier happens such as divide-by-zero, out-of-range parameter, for example, the unit shall trip and the HYP Logic Board shall indicate the rectifier program fault and the error information including module number and line number via the communications link. | When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. | 134 |
| VSD SHUTDOWN – REQUESTING FAULT DATA | VSD shut the chiller down; cause not yet received over the serial link (safety). | The VSD has shut down the chiller and the control center has not yet received the cause of the fault from the VSD, via the serial communications link. The VSD shuts down the chiller by opening the Motor Controller VSD Stop Contacts (located on the VSD Logic Board and connected between TB6-16 and TB6-53 in the control center). Since serial communications are initiated every 2 seconds, this message appears for a few seconds. | Then replaced with one of the other VSD fault messages. | 134 |
| VSD - INVERTER PROGRAM FAULT | Inverter software/motor design validation failed. | This drive will be used on two different motor designs. It is necessary to validate that the inverter software is correct for the motor designed used in the application. To ensure that the correct software is installed in the VSD logic board, three pieces of data must state that the correct inverter software is installed in the VSDF logic board for this shutdown not to occur. The software in the VSD logic board U38, must match the condition on J2 pin 14 and the programmed motor selection from the chiller control center. | 134 | |
| VSD - LINE VOLTAGE PHASE LOCK LOOP | Drive cannot determine the input voltage frequency (50/60 Hz). | The drive will automatically determine the input voltage frequency. The information about the input voltage frequency is provided to the drive logic board by the line voltage isolation board. If the driver logic board cannot determine that the input voltage frequency is 50 Hz or 60 Hz then this shutdown will occur. | 134 | |
| VSD - LINE VOLTAGE PHASE ROTATION | Internal phase rotation determinations disagree. | The input of the drive is not sensitive to the phase rotation of the input voltage, but internally to the drive the rotation must remain the same. The output of the line voltage isolation board cannot shown CBA rotation when the input voltage to the drive is really ABC rotation. There are two methods within the VSD logic board to determine the line voltage phase rotation. If these two methods do not report the same phase rotation then this shutdown will occur. | 134 |
From YMC2 Mod A Centrifugal Chiller with OptiView Control Center, Unit Operation Guide 160.78-O1
Original: docs.johnsoncontrols.com
Compressor
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Control panel warns of excessive landings of the magnetic bearing motor | Notify the nearest Johnson Controls office to request the presence of a Johnson Controls Service Technician. The technician can assess the condition of the touchdown bearings using electronic tools. | 22 |
Symptom: abnormally high discharge pressure
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Temperature difference between condensing temperature and water off condenser higher then normal | Condenser tubes dirty or scaled | • Clean condenser tubes • Check water conditioning | 24 | |
| Temperature difference between condensing temperature and water off condenser higher then normal | Condenser tubes dirty or scaled | • Clean condenser tubes • Check water conditioning | 24 | |
| High discharge pressure | High condenser water temperature | • Reduce condenser water inlet temperature • Check cooling tower and water circulation | 24 | |
| Temperature diffrence between condenser water on and water off higher than normal, with normal discharge temperature | Insufficient condensing water flow | Increase the quantity of water through the condenser to the correct value | 24 |
Symptom: abnormally low suction pressure
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Temperature difference between leaving chilled water and refrigerant in the evaporator greater than normal with normal discharge temperature. | Variable orifice problem | Remove obstruction | 24 | |
| Temperature difference between leaving chilled water and refrigerant in the evaporator greater than normal with normal discharge temperature | Evaporator tubes dirty or restricted | Clean evaporator tubes | 24 | |
| Temperature of chilled water too low with low motor amperes | Insufficient load for system capacity | Check capacity control operation and setting of low water temperature shutdown setpoint | 24 |
Symptom: high evaporator pressure
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| High chilled water temperature | System overload | Ensure that the capacity control devices and speed increased (without overloading the motor) until the load decreases | 24 |
From YMC2 Mod B OptiView Control Center Operation and Maintenance 160.84-OM1
Original: docs.johnsoncontrols.com
Start inhibit messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| LINE FREQUENCY NOT SET | This start inhibit is set when the Line Frequency setpoint is invalid. Line Frequency is set invalid on a new or cleared BRAM until programmed. | Inhibit persists until the Line Frequency setpoint is programmed. | 94 | |
| LINE VOLTAGE NOT SET | This start inhibit is set when the Line Voltage setpoint is invalid. Line Voltage is set invalid on a new or cleared BRAM until programmed. | Inhibit persists until the Line Voltage setpoint is programmed. | 94 | |
| VGD STROKE NOT CALIBRATED | The VGD stroke calibration procedure has not yet been performed. | Perform the VGD stroke calibration procedure. | 94 | |
| VGD FEEDBACK NOT CALIBRATED | The VGD feedback calibration has not yet been performed since last stroke calibration. | Perform the VGD feedback calibration (required since last stroke calibration). | 94 | |
| MBC - INITIALIZATION FAILURE | OptiView was unable to read a valid validation key code over serial communications from the MBC after prompted by voltage present on the MBC Alive contacts (I/O board TB3-71). | 94 |
Warning messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING - CONDENSER FREEZE THREAT FROM LOW PRESSURE | While the chiller state is Stopped, the Saturated Condenser Temperature decreased below 35.0°F (1.6°C). The condenser pump run contacts close. | Automatically reset and pump contacts return to prior state when either the chiller is not in stopped state or the Saturated Condenser Temperature is > 40.0°F (4.4°C). | 95 | |
| WARNING – CONDENSER – HIGH PRESSURE LIMIT | The Condenser Pressure exceeds the High Pressure Warning Setpoint threshold, programmed by a service technician logged in at service access level. The default high pressure limit is 162.5 psig (11.2 barg). While this condition is in effect, the chiller capacity is in override to reduce pressure. | Message automatically clears and normal LCHLT capacity control is restored when the condenser pressure decreases to below the Setpoint. | 95 | |
| WARNING – CONDENSER OR EVAPORATOR XDCR ERROR | The Evaporator pressure Transducer is indicating a higher pressure than the Condenser pressure Transducer after the chiller has been running for 10 minutes. This is indicative of a Condenser or Evaporator Transducer failure. Condition not checked in Brine mode. | Displayed until the condition clears and the warning reset keypad button is pressed in operator (or higher) access mode. | 95 | |
| WARNING – CONDENSER OR VGD SENSOR FAILURE | The difference between the Discharge Pressure Transducer output and the Condenser Pressure Transducer output has exceeded 21 psid for 3 continuous minutes while the chiller was running. This feature verifies the operation of the transducers; because both transducers are measuring essentially the same pressure, both outputs should be within the specified tolerance. | Must be manually cleared. Displayed until the transducer outputs are within the acceptable range of each other and the warning reset button is pressed in service access level. | 95 | |
| WARNING – EXCESS SURGE DETECTED | Applies only if Surge Protection shutdown feature is disabled. The Surge Window Count has exceeded the Count Limit. | Can be manually cleared after the Surge Window Count is less than or equal to the Count Limit, or the shutdown feature is Enabled, or the chiller is stopped. Press warning reset key on home screen when logged in at operator (or higher) access level. | 96 | |
| WARNING - LIQUID LEVEL SETPOINT NOT ACHIEVED | The chiller is running and Refrigerant Level > (Refrigerant Level setpoint +15%) or Refrigerant Level < (Refrigerant Level setpoint -15%) for 10 continuous minutes. The Warning is bypassed for the first 30 minutes of run to allow stable operation to establish. | Released when the chiller is not running or Refrigerant Level is within setpoint ±15%. The message clears automatically. | 96 | |
| WARNING - LOSS OF SUBCOOLER LIQUID SEAL | The chiller is running greater than 30 minutes and the Subcooler Effectiveness value decreased less than 0.400 (admin programmable) at any drop leg refrigerant temperature or increased greater than 1.50 (admin programmable) when the drop leg refrigerant temperature is at least 0.5 °F (0.27°C) below or any amount above the Entering Condenser Liquid Temperature. Subcooler effectiveness = (Condenser Sat Temp - Drop leg refrigerant temp)/(Cond Sat Temp - Entering Condenser Liquid Temp). | Press the warning reset button on the home screen when logged in at operator (or higher) access level. | 96 | |
| WARNING – MBC – HIGH AXIAL OSCILLATOR VOLTAGE | Manual reset warning set when the internal oscillator that drives the axial position sensor coil is overloaded for one continuous second. Typically the result of an open in the connection to the shaft position sensor; could also be a failure of the MBC control board. | Clears when the voltage is normal and the warning reset button is pressed in operator (or higher) access mode. | 96 | |
| WARNING – MBC – HIGH RADIAL OSCILLATOR VOLTAGE | Manual reset warning set when the internal oscillator that drives the radial position sensor coil is overloaded for one continuous second. Typically the result of an opening in the connection to the shaft position sensor; could also be a failure of the MBC control board. | Clears when the voltage is normal and the warning reset key is pressed in operator (or higher) access mode. | 96 | |
| WARNING – MBC – CHECKSUM CENTERING | Appears when the MBC Axial Centering process was never performed, or not correctly realized internally. | The centering process (calibration section of Form 160.84-M2) must be done in admin access; the message then clears when the warning reset key is pressed in operator (or higher) access mode. | 96 | |
| WARNING – MBC – DSP WATCHDOG | A software reboot has occurred on the control board due to processor problem, but reset with the reboot. | Clears when the warning reset key is pressed in operator (or higher) access mode. | 96 | |
| WARNING – MBC – AMP WATCHDOG | A software reboot has occurred on the amplifier (power) board due to processor problem, but reset with the reboot. | Clears when the warning reset key is pressed in operator (or higher) access mode. | 96 | |
| WARNING – MBC – INTERNAL ALARM | The MBC experienced an unsatisfactory condition detected internally to the control system. | Clears when the condition is resolved and the warning reset key is pressed in operator (or higher) access mode. | 96 | |
| WARNING – MBC – ROTATION MODE OFF | During the time the MBC Rotation Mode is commanded ON by the microboard via serial comms, set if the MBC reports Rotation Mode is OFF by serial comms. Inhibited if MBC communication is not initiated and during the first 15 seconds after the Rotation Mode is commanded ON. | Released when Rotation Mode status matches the microboard command to the MBC. | 97 | |
| WARNING – MOTOR – HIGH CURRENT LIMIT | The chiller motor current is greater than or equal to the Motor Overload current limit. The Motor Overload current limit is predetermined from the motor model and Maximum VSD Output Current. While this condition is in effect, chiller capacity control is in override to reduce current. | Normal LCHLT capacity control operation is resumed and this message automatically clears when the motor current decreases below this limit. | 97 | |
| WARNING – MOTOR – HIGH HOUSING TEMPERATURE | The Motor Housing Temperature is greater than or equal to 167°F (75°C). | Released when Motor Housing Temperature is less than 158°F (70°C). | 97 | |
| WARNING - MOTOR - HIGH ROTOR TEMPERATURE | Occurs when the estimated rotor temperature exceeds 230°F (110°C) for 3 continuous seconds. | Automatically clears when all winding temperatures decrease below the warning threshold. | 97 | |
| WARNING - MOTOR – HIGH WINDING TEMPERATURE | Occurs when any of the enabled motor winding temperatures exceeds 275°F (135°C) for 3 continuous seconds. Does not act on any individual winding temperature sensor that has been disabled with the TEMPERATURE DISABLED setpoint on the Motor Details screen. | Automatically clears when all winding temperatures decrease below the warning threshold. | 97 | |
| WARNING – REAL TIME CLOCK FAILURE | During the initialization process when power is applied, test data written to the BRAM battery-backed memory device (IC location U52 on Microboard) is read back and compared. If the read data is not the same as that written, the BRAM and Real Time Clock operation is assumed defective. | The BRAM should be replaced by a qualified service technician. Message automatically clears when the BRAM problem has been solved. | 97 | |
| WARNING – SETPOINT OVERRIDE | A blank BRAM battery-backed memory device (IC location U52 on Microboard) or a failure of this device was detected during power-up initialization. Any or all of the programmed Setpoints could have been corrupted; all Setpoints have been automatically changed to their Default values. | All Setpoints must be reprogrammed to their desired values. Clears when the warning reset key is pressed in operator (or higher) access mode. | 97 | |
| WARNING – UPS – BATTERY NOT CONNECTED | Auto reset warning. The minimum and maximum Battery Voltage within each 10 second window is stored; if the difference is greater than 0.5 V a counter is increased, if less than 0.5 V the counter is reset to 0. Set when the Battery Disconnected Counter >= 4 (intent: 4 consecutive 10 second windows of battery voltage fluctuations). | Released when the Battery Disconnected Counter is 0 for 60 continuous seconds. | 97 | |
| WARNING – UPS – CHECK BATTERY CONNECTION | Manual reset warning set when Battery Voltage > 16.0 V (indicates only the UPS output is connected to the battery leads). | Released when Battery Voltage < 16.0 V. | 98 | |
| WARNING – UPS – LINE LOW BATTERY VOLTAGE | Auto reset warning set when all of the following are true: Control Voltage digital input is high (indicates line power is available); Battery Voltage < Line Low Battery Voltage Threshold. | Releases when Battery Voltage > Line Low Battery Voltage Threshold + 0.1 V. | 104 | |
| WARNING – UPS – NOT CHARGING | Auto reset warning set when all of the following are true for 5 continuous seconds: Control Voltage digital input is high (indicates line power is available); UPS Line / Charging digital input is low (indicates UPS not reporting in charge mode). | Releases when any of the following are true: Control Voltage digital input is low (indicates line power is lost); UPS Line / Charging digital input is high (UPS is reporting in charge mode). | 98 | |
| WARNING – VSD – INPUT VOLTAGE IMBALANCE | Line voltage imbalance is calculated for every VSD communications cycle from the line-to-line total rms voltages (Vab, Vbc, Vca) received from the drive. | Warning displays if the imbalance exceeds 5% continuously for 45 seconds. The 45 second timer resets and the warning clears if three consecutive imbalance readings fall below the 5% threshold. | 98 |
Cycling shutdown messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| CHILLED LIQUID – FLOW SWITCH OPEN | The Chilled Liquid Flow Switch has remained open for 5 continuous seconds while the chiller was running, in soft shutdown, or at least 45 seconds after MBC startup is initiated. | The chiller will automatically restart when the flow switch closes or the fault will clear if the chiller run command is ceased. | 99 | |
| CONDENSER – FLOW SWITCH OPEN | The Condenser water flow switch has remained open for 5 continuous seconds while the chiller was running, in soft shutdown, or at least 45 seconds after MBC startup is initiated. | The chiller will automatically restart when the flow switch closes or the fault will clear if the chiller run command is ceased. | 99 | |
| CONDENSER -FREEZE THREAT-FLOW SWITCH OPEN | Set when all of the following are true: Chiller State is Stopped; Saturated Condenser Temperature < 35.0°F (1.6°C); Condenser Flow Switch is Open for 1 minute or longer. | Released when any of the following are true: Chiller State is not Stopped; Saturated Condenser Temperature > 40.0°F (4.4°C); Condenser Flow Switch is Closed. | 99 | |
| CONTROL PANEL – LOSS OF CONTROL VOLTAGE | The line power input signal at I/O board TB3-81 was low for 1 second continuous. This signal is used to determine when the digital inputs are affected by a line power loss versus an actual condition for their devices. This fault is not expected on an actual loss of microboard power from the critical load bus, because the processor will be off before the fault delay. | Can indicate a Cycling (auto-restart after power failure) or Safety (manual restart after power failure) shutdown, depending upon control center configuration. | 99 | |
| CONTROL PANEL – POWER FAILURE | A Control Power failure has occurred. | If the power failure occurred while the chiller was running, it will automatically restart when power is restored. Can indicate a Cycling (auto-restart after power failure) or Safety (manual restart after power failure) shutdown depending upon control center configuration; cycling shutdown when displayed in orange characters, safety shutdown when displayed in red characters. Configured by a qualified service technician per YORK YMC2 Service Manual (Form 160.84-M2). | 99 | |
| CONTROL PANEL – SCHEDULE | The programmed Daily Schedule Setpoint has shutdown the chiller. If this occurs while the chiller is running, a Soft Shutdown is performed. | The chiller will automatically restart at the next scheduled start time. | 99 | |
| EXPANSION I/O – SERIAL COMMUNICATIONS | Valid communication between the microboard and the LTC I/O Board have been disrupted for three consecutive attempts. | The chiller will automatically restart when valid communication is received. | 100 | |
| ISOLATION VALVES - NOT CLOSED | The optional brine freeze protection motorized isolation valves Close output is energized > 40 seconds but the feedback from the valve limit switch does not indicate it closed for 3 continuous seconds. | Released when the isolation valves closed input is energized. | 100 | |
| LEAVING CHILLED LIQUID – LOW TEMPERATURE | The Leaving Chilled Liquid Temperature has decreased to the programmed Shutdown Temperature Setpoint. If the chiller is running when this occurs, a Soft Shutdown is performed. | The chiller will automatically restart when the temperature increases to the programmed Restart Temperature Setpoint. | 100 | |
| MBC – FAULT CONTACTS OPEN | See MBC Shutdown – Requesting Fault Data. If the control center's microboard does not receive the cause of the MBC fault over the serial link within 10 seconds after the fault contacts open is recognized, it is assumed it is not forthcoming and that message is replaced with this message. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 100 | |
| MBC - LOW INPUT VOLTAGE | Main DC supply voltage to the MBC decreased below 135 VDC (150%-10%). | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 100 | |
| MBC – SERIAL COMMUNICATIONS | Set when an invalid or no response is received from the MBC to a Modbus command from the panel for 3 consecutive attempts with a 2 second timeout between attempts. Triggered by the Modbus communications task when its fault conditions are met (thresholds of consecutive timeouts, ID mismatches, checksum failures, or error packets). | Released when a valid response is received. | 101 | |
| MBC SHUTDOWN – REQUESTING FAULT DATA | The MBC has shutdown the chiller and the control center has not yet received the cause of the fault from the MBC via the serial communications link. The MBC shuts down the chiller by opening the MBC Fault contacts (located on the MBC control board and connected to TB3-70 in the control center). The microboard then sends a request for the cause of the fault to the MBC control board over the serial link; since serial communications are initiated every 2 seconds, this message is typically displayed for a few seconds and then replaced with one of the other MBC fault messages in this section. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 101 | |
| MBC – SPEED SIGNAL FAULT | Set when the MBC looses the speed signal that is expected from the VSD or speed signal is less than 10 Hz while the MBC is commanded in Rotation Mode. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. A 10 second bypass exists when the initial command to Rotation Mode occurs. | Released when the MBC is out of Rotation mode or speed greater than 10 Hz is transmitted. | 101 | |
| MBC – STARTUP FAILURE | Set when the chiller fails to exit the MBC startup state within 60 seconds, during a chiller start. Refer to the Basic Operation section of YMC2 Model B Service Manual (Form 160.84-M2) for conditions necessary to complete MBC startup successfully. | Check fault history details to determine which specific conditions were not met. Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 101 | |
| MBC – V13 LOW FREQUENCY DISPLACEMENT | The MBC has measured shaft displacement greater than 90 micron from center in the orthogonal radial axis designated V at the impeller end radial magnetic bearing during Levitation or Rotation mode over a 7 second window (approximately 2/3 of the air gap space to the touchdown bearing). The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when displacement is less than 90 micron. | 101 | |
| MBC - UNKNOWN PARAMETER FILE | Set when the bearing setup parameter file received from Opti-View is not an expected file format. This fault could be corrupted data transfer between OptiView and the MBC. | Released when the error is corrected. | 101 | |
| MBC – V13 POSITION | The MBC has measured shaft displacement greater than 100 micron from center in the orthogonal radial axis designated V at the impeller end radial magnetic bearing during Levitation or Rotation mode (approximately 2/3 of the air gap space to the touchdown bearing). The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when displacement is less than 100 micron. | 101 | |
| MBC – V24 LOW FREQUENCY DISPLACEMENT | Shaft displacement greater than 90 micron from center in the orthogonal radial axis designated V at the opposite-impeller end radial magnetic bearing during Levitation or Rotation mode over a 7 second window (approximately 2/3 of the air gap space to the touchdown bearing). The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when displacement is less than 90 micron. | 102 | |
| MBC – V24 POSITION | Shaft displacement greater than 100 micron from center in the orthogonal radial axis designated V at the opposite-impeller end radial magnetic bearing during Levitation or Rotation mode (approximately 2/3 of the air gap space to the touchdown bearing). The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when displacement is less than 100 micron. | 102 | |
| MBC – W13 LOW FREQUENCY DISPLACEMENT | Shaft displacement greater than 90 micron from center in the orthogonal radial axis designated W at the impeller end radial magnetic bearing during Levitation or Rotation mode over a 7 second window (approximately 2/3 of the air gap space to the touchdown bearing). The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when displacement is less than 90 micron. | 102 | |
| MBC – W13 POSITION | Shaft displacement greater than 100 micron from center in the orthogonal radial axis designated W at the impeller end radial magnetic bearing during Levitation or Rotation mode (approximately 2/3 of the air gap space to the touchdown bearing). The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when displacement is less than 100 micron. | 102 | |
| MBC – W24 LOW FREQUENCY DISPLACEMENT | Shaft displacement greater than 90 micron from center in the orthogonal radial axis designated W at the opposite-impeller end radial magnetic bearing during Levitation or Rotation mode over a 7 second window (approximately 2/3 of the air gap space to the touchdown bearing). The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when displacement is less than 90 micron. | 102 | |
| MBC – W24 POSITION | Shaft displacement greater than 100 micron from center in the orthogonal radial axis designated W at the opposite-impeller end radial magnetic bearing during Levitation or Rotation mode (approximately 2/3 of the air gap space to the touchdown bearing). The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when displacement is less than 100 micron. | 102 | |
| MBC – VW13 VIBRATION | The MBC has measured synchronous speed (first harmonic) shaft vibration at the impeller end radial magnetic bearing greater than 45 micron peak amplitude in Rotation mode. This condition is monitored only when the AVR and ABS filter is on, which occurs for speed above 70 Hz. The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when vibration is less than 45 micron. | 103 | |
| MBC – VW24 VIBRATION | Synchronous speed (first harmonic) shaft vibration at the opposite-impeller end radial magnetic bearing greater than 45 micron peak amplitude in Rotation mode. Monitored only when the AVR and ABS filter is on, which occurs for speed above 70 Hz. The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when vibration is less than 60 micron. | 103 | |
| MBC – Z12 LOW FREQUENCY DISPLACEMENT | Shaft displacement greater than 100 micron axially from the design running position over a 7 second window (approximately 1/3 of the air gap space to the touchdown bearing axially). The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when displacement is less than 100 micron. | 103 | |
| MBC – Z12 POSITION | Shaft displacement greater than 100 micron axially from the design running position (approximately 1/2 of the air gap space to the touchdown bearing axially). The MBC Fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when displacement is less than 100 micron. | 103 | |
| MBC - Z12 VIBRATION | The MBC has measured a vibration in axial position at 1 times the rotating frequency whose amplitude exceeds 60 micron. This frequency axially can be the image of the rotor axial run-out. Available when AVR or ABS are activated. The MBC fault contacts open. The MBC remains in Levitation mode until commanded to de-levitate over serial comms. | Released when this displacement is less than 60 micron. | 103 | |
| MULTIUNIT CYCLING – CONTACTS OPEN | The Multiunit Cycling contacts connected to I/O Board TB4-9 have opened to initiate a cycling shutdown. If the chiller is running when this occurs, the Pre-rotation Vanes are driven fully closed prior to shutting down the chiller. | The chiller will automatically restart when the contacts close. | 103 | |
| SYSTEM CYCLING – CONTACTS OPEN | The System Cycling contacts connected to I/O Board TB4-13 have opened to initiate a cycling shutdown. If the chiller is running when this occurs, the Pre-rotation Vanes are driven fully closed prior to shutting down the chiller. | The chiller will automatically restart when the contacts close. | 103 | |
| UPS – LINE LOW BATTERY VOLTAGE | This cycling fault initiates a soft shutdown if set while the chiller state is Running. Set during chiller state Running or Soft Shutdown when: Battery Voltage Faults setting is enabled and Warning – UPS – Line Low Battery Voltage warning has been set for 60 continuous minutes. Also set during chiller state Stopped when: Battery Voltage Faults setting is enabled; Control Voltage digital input is high (indicates line power is available); Battery Voltage < Line Low Battery Voltage Threshold. | Released when any of the following are true: Battery Voltage Faults is Disabled; Battery Voltage > Line Low Battery Voltage Threshold + 0.1 V. | 104 | |
| VSD – DC BUS PRE- REGULATION | The DC Bus voltage has not increased to a value of +/- 50 volts of the DC Bus voltage setpoint of 785 VDC within 2 seconds after entering the pre-regulation state. | The VSD will attempt another pre-charge and pre-regulation cycle after a delay of 10 seconds. If this shutdown occurs three consecutive times, the chiller will lock out on a VSD – DC BUS Pre-regulation Lockout. | 104 | |
| VSD – HIGH DC BUS VOLTAGE | The DC Bus voltage exceeds the value for the given model of drive: 0490, 0490A — 878 VDC; 0612A, 0730A, 0774, 1278A — 985 VDC. Typically occurs when there is a sudden change in the input voltage due to storms, utility power problems, or site power problems. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 104 | |
| VSD – HIGH INTERNAL AMBIENT TEMPERATURE | The variable speed drive contains two temperature sensors which monitor the unit's internal ambient temperature. Generated when the higher of the two ambient temperatures exceeds a high limit of 158°F (70°C). Potential causes: internal VSD fan failure, VSD coolant pump failure, entering condenser water temperature higher than design, condenser water flow lower than required, fouled VSD heat exchanger, or restriction of condenser water to the VSD. | The unit's fan(s) and water pump(s) remain energized until the internal temperature drops below 148°F (64°C), after which they are de-energized and the fault can be cleared. | 104 | |
| VSD – HIGH PHASE A INPUT CURRENT | The A phase input current exceeds the value for the given model of drive: 0490 — 886 Amps; 0490A — 942 Amps; 0612A — 1418 Amps; 0730A — 1418 Amps; 0774 — 1446 Amps; 1278A (380-415 VAC) — 3304 Amps; 1278A (460 VAC) — 2796 Amps. | If three high input current cycling shutdown faults occur on any phase within 90 minutes, the third fault in the 90 minute period will cause a Safety Shutdown. If the safety shutdown occurs, the chiller can be restarted after the clear faults button is pressed. | 105 | |
| VSD – HIGH PHASE B INPUT CURRENT | See VSD – HIGH PHASE A INPUT CURRENT. | If three high input current cycling shutdown faults occur on any phase within 90 minutes, the third fault in the 90 minute period will cause a Safety Shutdown. If the safety shutdown occurs, the chiller can be restarted after the clear faults button is pressed. | 105 | |
| VSD – HIGH PHASE C INPUT CURRENT | See VSD – HIGH PHASE A INPUT CURRENT. | If three high input current cycling shutdown faults occur on any phase within 90 minutes, the third fault in the 90 minute period will cause a Safety Shutdown. If the safety shutdown occurs, the chiller can be restarted after the clear faults button is pressed. | 105 | |
| VSD – HIGH PHASE A MOTOR CURRENT | The A phase motor current exceeds the value for the given model of drive: 0490, 0490A — 776 Amps; 0612A — 1094 Amps; 0730A, 0774 — 1317 Amps; 1278A — 2164 Amps. | If three high motor current cycling shutdown faults occur on any phase within 90 minutes, the third fault in the 90 minute period will cause a Safety Shutdown. If the safety shutdown occurs, the chiller can be restarted after the clear faults button is pressed. | 105 | |
| VSD – HIGH PHASE B MOTOR CURRENT | See VSD – HIGH PHASE A MOTOR CURRENT. | If three high motor current cycling shutdown faults occur on any phase within 90 minutes, the third fault in the 90 minute period will cause a Safety Shutdown. If the safety shutdown occurs, the chiller can be restarted after the clear faults button is pressed. | 105 | |
| VSD – HIGH PHASE C MOTOR CURRENT | See VSD – HIGH PHASE A MOTOR CURRENT. | If three high motor current cycling shutdown faults occur on any phase within 90 minutes, the third fault in the 90 minute period will cause a Safety Shutdown. If the safety shutdown occurs, the chiller can be restarted after the clear faults button is pressed. | 105 | |
| VSD INITIALIZATION FAILED | Upon application of power, all boards go through the initialization process (memory locations cleared, program jumper positions checked, serial communications links established). If this process is not completed the OptiView panel will indicate this fault. One cause: serial data communications must be established — if communications between the VSD Logic Board and control center Microboard does not take place during initialization, this message is generated. | Serial communications can be verified by selecting the VSD Details screen from the Motor screen and observing the Full Load Amps value; a zero displayed for this and other VSD parameters indicates a serial communications link problem. Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 105 | |
| VSD – INVALID SETPOINTS | The VSD Logic Board is able to determine which model of drive can run which model of motor. If the Control Center provides a model of motor that is not compatible with this model of VSD, then this shutdown is generated. | When this condition clears, the chiller can be started after the clear faults button is pressed. | 106 | |
| VSD – LOGIC BOARD POWER SUPPLY | Generated by the VSD logic board; indicates that the low voltage power supplies for the logic boards have dropped below their allowable operating limits. This message usually means the power to the VSD has been removed. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 106 | |
| VSD – LOGIC BOARD PROCESSOR | Generated if a communications problem occurs between the two microprocessors on the VSD Logic Board. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 106 | |
| VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE | The temperature of the input baseplate phase A has decreased below the low limit of 37°F (2.7°C). | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. The cooling fans and pumps will turn on while this shutdown is present and turn off when the temperature rises above the fault-reset threshold. | 106 | |
| VSD – LOW PHASE B INPUT BASEPLATE TEMPERATURE | See VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE. | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. The cooling fans and pumps will turn on while this shutdown is present and turn off when the temperature rises above the fault-reset threshold. | 106 | |
| VSD – LOW PHASE C INPUT BASEPLATE TEMPERATURE | See VSD – LOW PHASE A INPUT BASEPLATE TEMPERATURE. | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. The cooling fans and pumps will turn on while this shutdown is present and turn off when the temperature rises above the fault-reset threshold. | 106 | |
| VSD – LOW PHASE A MOTOR BASEPLATE TEMPERATURE | The OptiView panel will determine this fault when the temperature of the motor baseplate phase A has decreased below the low limit of 37°F (2.7°C). | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. The cooling fans and pumps will turn on while this shutdown is present and turn off when the temperature rises above the fault-reset threshold. | 106 | |
| VSD – LOW PHASE B MOTOR BASEPLATE TEMPERATURE | See VSD – LOW PHASE A MOTOR BASEPLATE TEMPERATURE. | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. The cooling fans and pumps will turn on while this shutdown is present and turn off when the temperature rises above the fault-reset threshold. | 106 | |
| VSD – LOW PHASE C MOTOR BASEPLATE TEMPERATURE | See VSD – LOW PHASE A MOTOR BASEPLATE TEMPERATURE. | All phase temperatures have to increase above the fault-reset threshold of 42°F (5.5°C) for this fault to be cleared. The cooling fans and pumps will turn on while this shutdown is present and turn off when the temperature rises above the fault-reset threshold. | 106 | |
| VSD – NOT RUNNING | The OptiView panel will determine this fault when the VSD has not reported run state via serial communications for 8 seconds while the microboard issues a VSD run command. | Released when the microboard command is Stopped State. | 106 | |
| VSD – PHASE A INPUT DCCT OFFSET | When the VSD begins precharge, the output of the input current Direct Current Current Transformers (DCCT) are evaluated to ensure that they are reading zero current when no current is flowing through the DCCT. If the zero current output value is above a threshold, then this shutdown is generated. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 106 | |
| VSD – PHASE B INPUT DCCT OFFSET | See VSD – PHASE A INPUT DCCT OFFSET. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 107 | |
| VSD – PHASE C INPUT DCCT OFFSET | See VSD – PHASE A INPUT DCCT OFFSET. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 107 | |
| VSD – PHASE A INPUT GATE DRIVER | The gate driver board for the input rectifier monitors the power supplies within the gate driver circuit, and verifies that the input rectifier can be properly controlled. If the gate driver monitor determines that the input rectifier cannot be properly controlled, then the drive will shutdown and display this message. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 107 | |
| VSD – PHASE B INPUT GATE DRIVER | See VSD – PHASE A INPUT GATE DRIVER. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 107 | |
| VSD – PHASE C INPUT GATE DRIVER | See VSD – PHASE A INPUT GATE DRIVER. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 107 | |
| VSD – PHASE A MOTOR GATE DRIVER | The gate driver board for the motor inverter monitors the power supplies within the gate driver circuit, and verifies that the input rectifier can be correctly controlled. If the gate driver monitor determines that the input rectifier cannot be properly controlled, then the drive will shutdown and display this message. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 107 | |
| VSD – PHASE B MOTOR GATE DRIVER | See VSD – PHASE A MOTOR GATE DRIVER. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 107 | |
| VSD – PHASE C MOTOR GATE DRIVER | See VSD – PHASE A MOTOR GATE DRIVER. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 107 | |
| VSD – PRECHARGE – LOW DC BUS VOLTAGE 1 | During pre-charge, the DC Bus voltage must exceed the minimum threshold determined by the Line Voltage Setpoint within 4 seconds after the pre-charge signal has been commanded (380/415 V: 41 V; 460 V: 50 V). If this condition is not met, this shutdown is generated. | The VSD logic board shall wait 10 seconds before clearing the fault and allowing another pre-charge to start; the VFD's fan(s) and water pump(s) shall remain energized during this time. Up to three consecutive pre-charge-related faults are allowed; after the third consecutive pre-charge-related fault, Safety Shutdown message VSD – PRECHARGE LOCKOUT is generated. | 107 | |
| VSD – PRECHARGE – LOW DC BUS VOLTAGE 2 | During Pre-charge, the DC Bus voltage must exceed the minimum threshold determined by the Line Voltage Setpoint within 12 seconds after the pre-charge signal has been commanded (380/415 V: 414 V; 460 V: 500 V). If this condition is not met, this shutdown is generated. | The VSD logic board shall wait 10 seconds before clearing the fault and allowing another pre-charge to start; the VFD's fan(s) and water pump(s) shall remain energized during this time. Up to three consecutive pre-charge-related faults are allowed; after the third consecutive pre-charge-related fault, Safety Shutdown message VSD – PRECHARGE LOCKOUT is generated. | 107 | |
| VSD – RUN SIGNAL | Redundant RUN signals are generated by the control center; one via TB6-24 and the second via the Serial Communications link. Upon receipt of either of the two RUN commands by the VSD, a 5 second timer shall commence timing. If the run signal on TB6-24 is not received by the VSD Logic Board within 5 seconds, a shutdown is performed. Generally indicative of a wiring problem between the control center and the VSD. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 108 | |
| VSD – SERIAL RECEIVE | Generated when the VSD logic board has not received a valid communications packet from the control center for 10 consecutive seconds. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 108 | |
| VSD SHUTDOWN – REQUESTING FAULT DATA | The VSD has shutdown the chiller and the control center has not yet received the cause of the fault from the VSD, via the serial communications link. The VSD shuts down the chiller by opening the Motor Controller VSD Stop Contacts. The control center then sends a request for the cause of the fault to the VSD over the serial link; since serial communications are initiated every 2 seconds, this message is typically displayed for a few seconds and then replaced with one of the other VSD fault messages. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 108 | |
| VSD – SINGLE PHASE INPUT POWER | The VSD monitors the input voltage of all three phases. If the input voltage of any one phase drops below the threshold value for the given input voltage range, then this shutdown will occur (380/415: 264 Volts; 460: 295 Volts). | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 108 | |
| VSD – STOP (FAULT) CONTACTS OPEN | See VSD SHUTDOWN – REQUESTING FAULT DATA. If the control center does not receive the cause of the Fault over the Serial Link within 20 seconds, it is assumed it is not forthcoming and that message is replaced with VSD – STOP CONTACTS OPEN. | Cycling shutdown: the chiller will automatically restart when the cycling condition clears. | 108 |
Safety shutdown messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| AUXILIARY SAFETY – CONTACTS CLOSED | The Auxiliary Safety shutdown input, connected to I/O Board TB4-31, senses 115 VAC, initiating a safety shutdown. This input is a general-purpose, user defined safety shutdown input. | The chiller can be started after the contacts open and the clear fault button is pressed. | 108 | |
| CONDENSER – HIGH PRESSURE | The condenser pressure, as sensed by the Condenser Transducer, has increased to greater than 200 psig for shells with 235 psig DWP and 295 psig for shells with 350 psig DWP. The control determines the shell DWP by the condenser model number on the Sales Order Screen. | The chiller can be started after the pressure decreases to less than 140 psig for shells with 235 psig DWP and 235 psig for shells with 350 psig DWP and the clear fault button is pressed. | 108 | |
| CONDENSER – HIGH PRESSURE CONTACTS OPEN | The contacts of the electro-mechanical high pressure safety device, located on the condenser shell, have opened because this device has detected a pressure greater than 204±7 psig for shells with 235 psig DWP and 308±7 psig for shells with 350 psig DWP. | The contacts will automatically close when the condenser pressure decreases to less than 160±10 psig for the 235 DWP shells and 230±10 psig for the 350 DWP shells. The chiller can be started after the contacts close and the clear fault button is pressed. | 108 | |
| CONDENSER – HIGH PRESSURE – STOPPED | The condenser pressure exceeded 170 psig for shells with 235 psig DWP and 264 psig for shells with 350 psig DWP while the chiller was stopped. High temperature condenser water flowing through the condenser while the chiller is shutdown can cause a condenser high pressure condition resulting in loss of refrigerant; this safety fault anticipates this problem by annunciating the condenser high pressure condition. | The chiller can be restarted after a service technician performs a special reset preset procedure. | 109 | |
| CONDENSER – PRESSURE TRANSDUCER OUT OF RANGE | The Condenser Pressure Transducer is indicating a pressure that is less than 6.8 psig or greater than 300.0 psig, outside the normal operating range of the transducer. This generally indicates a defective transducer. | The chiller can be started after the transducer is indicating a pressure that is within range and the clear fault button is pressed. | 109 | |
| CONTROL PANEL - INVALID BRAM | On bootup, the panel shall determine whether a 512K BRAM module is installed by a sequence of tests where data is written and read from address above and below 128K. If the BRAM is not 512K, this shutdown is generated. | 109 | ||
| CONTROL PANEL – LOSS OF CONTROL VOLTAGE | The line power input signal at I/O board TB3-81 was low for 1 second continuous. This signal is used to determine when the digital inputs are affected by a line power loss versus an actual condition for their devices. This fault is not expected on an actual loss of microboard power from the critical load bus, because the processor will be off before the fault delay. | Can indicate a Cycling (auto-restart after power failure) or Safety (manual restart after power failure) shutdown, depending upon control center configuration. | 109 | |
| CONTROL PANEL – POWER FAILURE | A Control Power failure has occurred. | If the power failure occurred while the chiller was running, it will automatically restart when power is restored. Indicates a cycling shutdown when displayed in orange characters; safety shutdown when displayed in red characters. Configured for auto-restart or manual restart after power failure by a qualified service technician per YORK YMC2 Service Manual (Form 160.84-M2). | 109 | |
| DISCHARGE – HIGH TEMPERATURE | The discharge temperature, as sensed by the Discharge Temperature Thermistor, has increased to greater than 220.0°F (104°C). | The chiller can be started after the temperature decreases to less than 220.0°F (104°C) and the clear fault button is pressed. | 109 | |
| DISCHARGE – LOW TEMPERATURE | The discharge temperature, as sensed by the Discharge Temperature Thermistor, has decreased to less than 30.0°F (-1.1°C). | The chiller can be started after the temperature increases to greater than 30.0°F (-1.1°C) and the clear fault button is pressed. | 109 | |
| EVAPORATOR – LOW PRESSURE – SMART FREEZE | Smart Freeze protection is activated and has shutdown the chiller because the evaporator temperature has been below the Smart Freeze threshold for greater than the allowable number of seconds. If Evaporator Refrigerant Temperature sensor RT7 is enabled, it is used as the evaporator refrigerant temperature and the freeze threshold is 32.8°F (0.4°C); if RT7 is not enabled, the Evaporator Saturation Temperature (derived from the Evaporator Pressure Transducer) is used and the freeze threshold is 34.0°F (1.1°C). The total count is incremented once for every second the evaporator refrigerant temperature is below the freeze threshold (never decremented below zero); seconds to freezing = (4053.7) / (freeze threshold – evap. refrigerant temp.). Smart Freeze is activated only if the feature has been enabled by a service technician and the Leaving Chilled Liquid temperature Setpoint is less than 38.0°F (3.3°C). | 110 | ||
| EVAPORATOR – TRANSDUCER OR LEAVING LIQUID PROBE | A possible defective Evaporator pressure Transducer or Leaving Chilled Liquid temperature Thermistor has been detected; the pressure and temperature indicated are not in the correct relationship. The control center converts the evaporator pressure to a Saturated Temperature value and compares it to the Leaving Chilled Liquid temperature (difference = chilled liquid temp – evaporator saturated temp). The difference should not be outside the range of –2.5°F (–1.4°C) to +25.0°F (+13.89°C). Shutdown is initiated if the difference is outside the acceptable range continuously for 10 min. | The chiller can be started after the clear fault button is pressed. | 111 | |
| EVAPORATOR – TRANSDUCER OR TEMPERATURE SENSOR | A possible defective Evaporator pressure Transducer or Refrigerant Temperature Sensor has been detected. The control center converts the evaporator pressure to a Saturated Temperature value and compares it to the optional Evaporator Refrigerant Temperature Sensor; if the difference is greater than 3.0°F (5.4°C) continuously for 1 min, this shutdown is performed. Check performed only when: chiller running at least 10 minutes; Evaporator Refrigerant temperature (RT7) enabled by a service technician; not in brine cooling mode; Smart Freeze is enabled; Evaporator Temperature Sensor (RT7) or Evaporator Saturation Temperature indicating less than 32.0°F (0°C). | The chiller can be started after the temperatures are within 3.0°F (1.77°C) of one another and the clear fault button is pressed. | 111 | |
| INTERNAL ERROR – INVALID BRAM | BRAM is detected to be a size other than 512K. | Clears when correct size BRAM is detected upon boot up. | 111 | |
| ISOLATION VALVES – NOT OPENED | The optional brine freeze protection motorized isolation valves Open output is energized > 40 seconds but the feedback from the valve limit switch does not indicate it opened for 3 continuous seconds. | This cycling fault is released when the chiller is stopped with the run command removed. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 111 | |
| MBC – CUSTOMER SERIAL LINK DISABLED | Set when the MBC Local/Remote Modbus command is not reported from the MBC as set for panel control. Caused if the MBC were accessed via a computer using diagnostic software and the serial communication setting changed in the Remote Command tab from Customer Serial Link to another choice. | The chiller can be started when the MBC setting is restored and the OptiView panel clear faults button is pressed. | 111 | |
| MBC – DSP COMMUNICATION | Set when the MBC control board detects a communication error within the control board of the MBC. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when the board-level communication failure is resolved. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 111 | |
| MBC – AMP COMMUNICATION | Set when the MBC control board detects a communication error between the control and amplifier boards of the MBC. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when the board-level communication failure is resolved. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 112 | |
| MBC – AMP WATCHDOG | Set when the MBC determines a lapse in internal microprocessor activity on the Amplifier Board through its Watchdog device. The MBC Fault contacts open. The MBC will not react to a levitation mode change command via serial comms and remains in the levitation mode it was in when the fault occurred until power is removed. | Power must be removed from the UPS to the MBC. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 112 | |
| MBC – DSP WATCHDOG | Set when the MBC determines a lapse in internal microprocessor activity on the Control Board through its Watchdog device. The MBC Fault contacts open. The MBC will not react to a levitation mode change command by serial comms and remains in the levitation mode it was in when the fault occurred until power is removed. | Power must be removed from the UPS to the MBC. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 112 | |
| MBC – EXCESSIVE shutdownS | Set if 3 MBC Cycling Shutdowns occur in a 15 minute window. The 15 minute window begins with the first MBC fault. | Released when the chiller is stopped. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 112 | |
| MBC – HIGH AMPLIFIER TEMPERATURE | Set when the MBC amplifier temperature exceeds 158°F (70°C) for 1 second continuous. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until the VSD rotation signal indicates less than 10 Hz, then the MBC de-levitates the rotor. Check the connection of the board to the heatsink and the response of the temperature sensor on the board. | Released when amplifier temperature drops below the trip value. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 112 | |
| MBC – HIGH BEARING Z1 TEMPERATURE | Set when the MBC detects a temperature greater than 266ºF (130ºC) on the impeller end axial magnetic bearing. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until the VSD rotation signal indicates less than 10 Hz. | Released when temperature is less than 266ºF (130ºC). The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 112 | |
| MBC – HIGH BEARING Z2 TEMPERATURE | Set when the MBC detects a temperature greater than 266ºF (130ºC) on the opposite-impeller end axial magnetic bearing. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until the VSD rotation signal indicates less than 10 Hz. | Released when temperature is less than 266ºF (130ºC). The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 112 | |
| MBC – HIGH INPUT VOLTAGE | Main DC supply voltage to the MBC exceeded 165 VDC (150+ 10%). | 112 | ||
| MBC – NO LEVITATION | Set when OptiView software is commanding MBC Levitation Mode ON but the MBC is not reporting Levitated within 15 seconds. This fault is prohibited when the MBC Alive input is not high, indicating the MBC unavailable. | Released when the chiller is stopped. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 112 | |
| WARNING – MBC – HIGH RADIAL OSCILLATOR VOLTAGE | Set when the internal oscillator that drives the radial position sensor coil is overloaded for one continuous second. Typically the result of an open in the connection to the shaft position sensor; could also be a failure of the MBC control board. The MBC Fault contacts open. | Released when the Oscillator voltage drop is normal. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 113 | |
| MBC – LOW RADIAL OSCILLATOR VOLTAGE | Set when the internal oscillator that drives the radial position sensor coil is low for one continuous second. Typically the result of a short in the connection to the shaft position sensor; could also be a failure of the MBC control board. The MBC Fault contacts open. | Released when the Oscillator voltage drop is normal. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 113 | |
| MBC – HIGH AXIAL OSCILLATOR VOLTAGE | Set when the internal oscillator that drives the axial position sensor coil is overloaded for one continuous second. Typically the result of an open in the connection to the shaft position sensor; could also be a failure of the MBC control board. The MBC Fault contacts open. | Released when the Oscillator voltage drop is normal. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 113 | |
| MBC – LOW AXIAL OSCILLATOR VOLTAGE | Set when the internal oscillator that drives the axial position sensor coil is low for one continuous second. Typically the result of a short in the connection to the shaft position sensor; could also be a failure of the MBC control board. The MBC Fault contacts open. | Released when the Oscillator voltage drop is normal. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 113 | |
| MBC – OVERSPEED FAULT | Set when the MBC determines the rotor speed exceeds the programmed setpoint of 360 Hz for 0.1 seconds continuous. Rotor speed is transmitted to the MBC from the VSD. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when the speed signal no longer exceeds the setpoint, which should occur when the chiller is stopped. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 113 | |
| MBC – POWER FAIL LANDING | Set when the panel boots up after a power loss has occurred and the buffer data prior to the shutdown showed motor speed > 0, indicating the motor was rotating when the UPS power was lost. | If the Power Fail Landing Counter on the MBC Details Screen is < 5, the chiller can be restarted after the cause of a loss of UPS power is determined and remedied and the OptiView panel clear faults button is pressed. If the Power Fail Landing Counter is => 5, lockout occurs and must be reset by a service technician according to the procedure in the Calibration and Troubleshooting Section of Form 160.84-M2. | 113 | |
| MBC – ROTOR CONTRACTION | Set when the MBC has calculated the algebraic difference between the displacement at shaft impeller end axial position sensor and the shaft opposite-impeller end axial position sensor is less than -100 µm. The MBC fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when the difference in displacements is over -100 µm. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 113 | |
| MBC – ROTOR ELONGATION | Set when the MBC has calculated the algebraic difference between the displacement at shaft impeller end axial position sensor and the shaft opposite-impeller end axial position sensor is greater than 700 µm. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when the difference in displacements no longer exceeds 700 µm. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 114 | |
| MBC – SPEED SIGNAL FAULT | Set when the MBC has the speed signal cycling fault three times in a 90-minute window. The window is started when not currently in a window and a MBC Speed Signal cycling fault is received. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when a valid speed signal over 10 Hz is presented or the MBC is not in Rotation mode. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 114 | |
| SAFETY STOP | Set when the panel safety stop hardware pushbutton is depressed, removing input from the I/O Board terminal TB3-28 for > 500 msec. continuous. It also sets the local command to STOP. | The chiller can be started when the pushbutton is released and the OptiView panel clear faults button is pressed. | 114 | |
| MBC – STARTUP FAILURE | Set when the chiller initiates three MBC-STARTUP FAILURE Cycling Shutdowns in a 90 minute period. Refer to YORK YMC2 Service Manual, Form 160.84-M2 for conditions necessary to complete MBC startup successfully. | Check fault history details to determine which specific conditions were not met. | 114 | |
| MBC – SPV UNAUTHORIZED ROTATION | Set when the MBC is commanded to Rotation mode while it is not indicating acceptable to rotate. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. The rotation mode command is coincident with MBC levitated and rotation allowed contacts closed. | The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 114 | |
| MBC – DSP UNAUTHORIZED ROTATION | Set when the MBC detects a rotor speed signal from the VSD while the Levitation Mode is not activated. The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over serial comms. | Released when the MBC Levitation or Rotation mode is activated or the VSD speed signal indicates no shaft rotation. The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 114 | |
| MOTOR – HIGH WINDING TEMPERATURE | Occurs when any of the enabled motor winding temperatures exceeded the programmed High Winding Temperature Shutdown Threshold of 302°F (150°C) for 3 continuous seconds. Will not act on any individual winding temperature sensor that has been disabled with the temperature disable setpoint on the motor details screen. | The chiller can be started after all winding temperatures decreased to at least 18°F (10°C) below the shutdown threshold and the compressor is stopped. | 114 | |
| MOTOR – HIGH ROTOR TEMPERATURE | Occurs when the estimated rotor temperature exceeds 250°F (121°C) for 3 continuous seconds. | The fault is released and the chiller can be restarted when the estimated rotor temperature is below 230°F (110°C) and the OptiView panel clear faults button is pressed. | 114 | |
| MOTOR – HIGH HOUSING TEMPERATURE | Set when Motor Housing Temperature is greater than or equal to 185°F (85°C). | Released when Motor Housing Temperature is less than 158°F (70°C). The chiller can be started when the condition is released and the OptiView panel clear faults button is pressed. | 115 | |
| SALES ORDER - INVALID compressor MODEL | Set when the Compressor Model field entered on the Sales Order screen does not conform to the format expected (format defined in the manual; data found on the compressor nameplate). Set when any of the following are true: Motor is anything other than M2 or M6; Motor rev is anything other than C; character other than '-' between position 3 and 4; SS/LS imp. dia. is anything other than 164, 174, 186, 197, 205, 218, 233, 246, 275, 295, or 331; SS/LS rotation is anything other than F; SS/LS imp. rev is anything other than the character A; SS/LS flow rev is anything other than the character C; Motor model is invalid; Invalid impeller/motor combination. Valid impeller and motor combinations are tabulated in the manual. | The fault is released when the values have been corrected. The chiller can be restarted after the clear faults button is pressed. | 115 | |
| SURGE PROTECTION – EXCESS SURGE | Applies only if Surge Protection shutdown feature is enabled. The Surge Window Count surge events exceeded the Count Limit setpoint. The chiller shuts down as soon as the count exceeds the limit. | The chiller can be started after the clear fault button is pressed. | 115 | |
| WATCHDOG – SOFTWARE REBOOT | The Microboard software Watchdog initiated a Microprocessor reset because it detected that a portion of the chiller operating program was not being executed. The result is a Safety shutdown and re-initialization of the program. Generally indicative of a severe electrical power disturbance or impending Microboard failure. | The chiller can be started after the compressor switch is placed in the Stop-Reset (O) position. | 116 | |
| UPS – BATTERY NOT CONNECTED | Initiates a soft shutdown if set while the chiller state is Running. Set during chiller state Running or Soft Shutdown when: Battery Voltage Faults is enabled and Warning - UPS - Battery Not Connected warning has been set for 10 continuous minutes. Also set during chiller state Stopped when: Battery Voltage Faults is enabled and Battery Disconnected Counter >= 4. | Released when any of the following are true: Battery Voltage Faults is Disabled; Battery Disconnected Counter is 0. | 116 | |
| UPS – INVERTER LOW BATTERY VOLTAGE | Set when all of the following are true for 5 continuous seconds: Battery Voltage Faults is Enabled; Control Voltage digital input is low (indicates line power is lost); Battery Voltage < Inverter Low Battery Voltage Threshold. | Released when any of the following are true: Battery Voltage Faults is Disabled; Battery Voltage > Line Low Battery Voltage Threshold + 0.1 V (note: the thresholds for set and release are intended to be different). | 116 | |
| VGD ACTUATOR FAULT | The VGD actuator fault digital input has lost voltage either by wiring issue or fault indicated at the actuator. The chiller begins a standard soft shutdown. | The fault clears when the digital input sees voltage. When the condition clears, the chiller can be started after the clear faults button is pressed. | 116 | |
| VGD POSITIONING FAULT | The VGD Position feedback indicates greater or less than the VGD command by 5% for 1 minute continuous. | The fault clears when the position is within the command + 5% over 1 minute. When the condition clears, the chiller can be started after the clear faults button is pressed. | 116 | |
| VGD FEEDBACK FAULT | The VGD Feedback voltage is below 0.4 VDC or above 4.6 VDC. | Released when voltage is within the range. When the condition clears, the chiller can be started after the clear faults button is pressed. | 116 | |
| VSD – DC BUS LOCKOUT – DO NOT CYCLE POWER | When the unit is stopped in a mode where no command exists to energize the DC Bus, the DC Bus voltage is monitored and checked against a threshold level of 100 VDC every five minutes. If the DC Bus voltage is higher than the threshold value, this shutdown is generated. | When the condition clears and VSD input modules tested and determined acceptable, the chiller can be started after the clear faults button is pressed. | 116 | |
| VSD – DC BUS PRE-REGULATION LOCKOUT | If the unit fails to complete pre-regulation (due to VSD – DC BUS PRE-REGULATION fault), it shall have to repeat pre-charge in order to attempt another pre-regulation. The VSD shall wait 10 seconds before clearing the DC Bus voltage pre-regulation fault and allowing another pre-charge to start; the unit fans and water pumps must remain energized during this wait time. The VSD shall allow up to three consecutive pre-regulation related faults to occur; after the third consecutive fault, this shutdown is generated. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 117 | |
| VSD – GROUND FAULT | Generated when the sum of the three phases of instantaneous input current values are greater than the shutdown value for a period of 1 second for the given model of drive: 0490, 0490A — 40 Amps; 0612A, 0730A — 80 Amps; 0774 — 120 Amps; 1278A — 200 Amps. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 117 | |
| VSD – HIGH PHASE A INPUT BASEPLATE TEMPERATURE | The Input Baseplate Temperature exceeded the shutdown value for the given model of drive: 0490, 0490A, 0612A, and 0730A — 190°F (87.8°C); 0774, 1278A (380-414 VAC) — 170°F (76.7°C); 1278A (460 VAC) — 150°F (65.6°C). | After the unit trips, the VSD fans and water pumps must remain energized until the temperatures of all three rectifier's phases drop below the fault-reset threshold of 165°F (73.9°C). In April of 2016 the shutdown control for the fans and pumps was changed (software versions C.HYP.03.04.01 and C.HYP.04.04.01) so they run for 2 minutes after the fault occurred; when this happens, the unit fans and water pumps must be de-energized. When the condition clears, the chiller can be started after the clear faults button is pressed. | 117 | |
| VSD – HIGH PHASE B INPUT BASEPLATE TEMPERATURE | See VSD – HIGH PHASE A INPUT BASEPLATE TEMPERATURE. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 117 | |
| VSD – HIGH PHASE C INPUT BASEPLATE TEMPERATURE | See VSD – HIGH PHASE A INPUT BASEPLATE TEMPERATURE. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 117 | |
| VSD – HIGH PHASE A MOTOR BASEPLATE TEMPERATURE | The motor/inverter IGBT module temperatures are continuously monitored by the gate driver board where the highest temperature for each phase is read and compared against a threshold value by the VSD logic board. If any IGBT module on the motor/inverter exceeds this threshold value then this shutdown will occur: 0490, 0490A, 0612A, 0730A, 0774 — 190°F (87.8°C); 1278A (380-414 VAC) — 180°F (82.2°C); 1278A (460 VAC) — 170°F (76.7°C). | The cooling fans and pumps for the VSD will continue to run until the temperature of all the IGBT modules fall below 165°F (73.9°C). In April of 2016 the shutdown control for the fans and pumps was changed (software versions C.HYP.03.04.01 and C.HYP.04.04.01) so they run for 2 minutes after the fault occurred; when this happens, the unit fans and water pumps must be de-energized. When the condition clears, the chiller can be started after the clear faults button is pressed. | 118 | |
| VSD – HIGH PHASE B MOTOR BASEPLATE TEMPERATURE | See VSD – HIGH PHASE A MOTOR BASEPLATE TEMPERATURE. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 118 | |
| VSD – HIGH PHASE C MOTOR BASEPLATE TEMPERATURE | See VSD – HIGH PHASE A MOTOR BASEPLATE TEMPERATURE. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 118 | |
| VSD – HIGH TOTAL DEMAND DISTORTION | Indicates the input current to the VSD is not sinusoidal. Occurs if the Total Demand Distortion (TDD) exceeds 25% continuously for 45 seconds. The displayed TDD is the sum of the harmonic currents up to the 50th harmonic supplied by the main power to the VSD divided by the Full Load Amps. | The chiller can be started after the clear fault button is pressed. | 118 | |
| VSD – INPUT CURRENT OVERLOAD | The input current overload value is variable based on the Input Job Full Load Amps value programmed at the Control Panel; it is 1.16 times the Input Job Full Load Amps value, but not to exceed the maximum for the drive model: 0490 — 416 Amps; 0490A — 511 Amps; 0612A, 0730A — 650 Amps; 0774 — 825 Amps; 1278A — 1195 Amps. Takes into account installations where the input line voltage could be up to 10% below nominal; an additional 5% of current is added to reduce nuisance shutdowns due to power fluctuations. The input current overload value must be greater than the shutdown value for 10 continuous seconds for this shutdown to occur. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 118 | |
| VSD – INPUT DCCT OFFSET LOCKOUT | If three consecutive VSD – Phase A, B or C Input DCCT Offset cycling faults occur, this safety shutdown is generated to require investigation and manual reset. | When the condition clears the chiller can be started after the clear faults button is pressed. | 119 | |
| VSD – INVERTER PROGRAM FAULT | The VSD software contains a verification process to ensure that the correct set of software is installed in the VSD logic board for the application. | When this condition clears, the chiller can be started after the clear faults button is pressed. | 119 | |
| VSD – LINE VOLTAGE PHASE ROTATION | The input voltage to the VSD is not phase rotation sensitive, but the VSD must be able to determine the correct input phase rotation. If the VSD logic board cannot determine the correct phase rotation, then this shutdown is generated. | When this condition clears, the chiller can be started after the clear faults button is pressed. | 119 | |
| VSD – LOGIC BOARD HARDWARE | After power is applied to the chiller, the VSD logic board performs several internal tests to ensure proper operation of the input power device. If the tests fail, then this shutdown is generated. | When this condition clears, the chiller can be started after the clear faults button is pressed. | 119 | |
| VSD – LOGIC BOARD PLUG | A jumper is located in the rectifier and inverter current transformers connectors that indicate the connector is correctly installed. If either connector is not installed, then this shutdown is generated. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 119 | |
| VSD – MOTOR CURRENT IMBALANCE | Each phase of motor current is compared against the average of the three phases of motor current to determine the current imbalance value. If the current imbalance value is greater than 32 amps for a period of 45 seconds, then this shutdown is generated (for example, phase currents deviating 33 amps from the average trip the shutdown). | The chiller can be started after the clear faults button is pressed. | 119 | |
| VSD – 105% MOTOR CURRENT OVERLOAD | Based on the highest output current compared to the programmed Motor Current value displayed on the Control panel; the overload value is 1.05 times the programmed Motor Current value and must be greater than the shutdown value for 40 continuous seconds. Drive model maximum motor current overload shutdown values: 0490, 0490A — 490 Amps; 0612A — 612 Amps; 0730A — 730 Amps; 0774 — 774 Amps; 1278A — 1278 Amps. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 119 | |
| VSD – MOTOR CURRENT THD FAULT | Provides protection to the compressor motor; high levels of current total harmonic distortion (THD) can cause the motor to overheat. | Verify that all wiring is correctly connected between the inverter and the output harmonic filter. When the condition clears, the chiller can be started after the clear faults button is pressed. | 119 | |
| VSD – PHASE A INPUT DCCT | The input current in each phase to the VSD is measured during the precharge time. If the input current does not exceed the shutdown value for the given model of drive, then this shutdown is generated: 0490A, 0490, 0612A, 0730A, 1278A — 5.0 amps; 0774 — 15.0 amps. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD – PHASE B INPUT DCCT | See VSD – PHASE A INPUT DCCT. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD – PHASE C INPUT DCCT | See VSD – PHASE A INPUT DCCT. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD – PHASE A MOTOR DCCT | The motor current in each phase of the VSD is measured at the beginning of the run command; this low value is used as the zero current value for the rest of the run time. The motor current is then monitored for the next 1.5 seconds to ensure that a minimum amount of current is flowing to the motor. If at the end of the 1.5 second time a minimum of 25 amps peak is not detected, then this shutdown is generated. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD – PHASE B MOTOR DCCT | See VSD – PHASE A MOTOR DCCT. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD – PHASE C MOTOR DCCT | See VSD – PHASE A MOTOR DCCT. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD – PHASE LOCKED LOOP | The VSD must be able to determine the input voltage frequency from the input voltage measurement. If the input voltage frequency is not stable enough for the VSD to make this determination, then this shutdown is generated. | When this condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD – PRECHARGE LOCKOUT | If the unit fails to complete pre-charge (due to VSD – PRECHARGE – LOW DC BUS VOLTAGE or VSD – PRECHARGE – HIGH DC BUS VOLTAGE), the VSD shall time 10 seconds before clearing the fault and allowing another pre-charge to start; the unit's fan(s) and water pump(s) shall remain energized during this time. The VSD shall allow up to three consecutive pre-charge-related faults to occur; after the third consecutive pre-charge-related fault, this shutdown is generated. | When the condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD – RECTIFIER PROGRAM FAULT | The VSD software contains a verification process to ensure that the correct set of software is installed in the VSD logic board for the application. | When this condition clears, the chiller can be started after the clear faults button is pressed. | 120 | |
| VSD shutdown – REQUESTING FAULT DATA | The VSD has shut down the chiller and the control center has not yet received the cause of the fault from the VSD, via the serial communications link. The VSD shuts down the chiller by opening the Motor Controller VSD Stop contacts (located on the VSD Logic Board and connected between TB6-16 and TB6-53 in the control center). The Microboard in the control center then sends a request for the cause of the fault to the VSD Logic Board over the serial link; since serial communications are initiated every 2 seconds, this message is typically displayed for a few seconds and then replaced with one of the other VSD fault messages. | 120 |
Automatic battery health test during shutdown
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| UPS Battery Health Test Failed – Step X | Displayed when the battery health test fails; X is the step that failed. Fail results occur if: the Battery Voltage drops to less than the Inverter Low Battery Voltage Threshold (default 11.0 V); the test takes longer than 75 seconds; the UPS shuts down (OptiView loses power) due to voltage, fuses, disconnect, or any other reason; or the 10 minute power loss holdup timer runs out before the test completes. Fail points indicated on the OptiView: Step 2 — waiting to sense line power removed (generally the 10 minute test time was exceeded); Step 3 — during the 60 second battery voltage monitoring under Levitation load (generally indicates a bad battery); Step 4 — after completion of the 60 second monitoring, waiting for successful automatic de-levitation (would indicate some unplanned failure of the control or communication); Step 5 — waiting to sense line power restored (generally the 10 minute test time was exceeded). | Remains while the Warning – UPS – Battery Test Failed warning is active; it and the warning are cleared when a Battery Health Test completes successfully. A fault displayed on next power up after a UPS shutdown can be cleared by running a successful battery health test. | 144 | |
| Warning – UPS – Battery Test Failed | Warning active when the UPS battery health test has failed. | Cleared when a Battery Health Test completes successfully. | 144 |
From YMC2 Mod A Software Changes V08 SI0461
Original: docs.johnsoncontrols.com
FAULTS & WARNINGS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING - QUARTERLY SERVICE REQUIRED - CONTACT JCI Event Code: 330 GPIC Warning Code: 145 |
Manual Reset Warning. Shutdown Type: None. Enable: Always. Allowed States: All. | Set when Days Since Last Quarterly Service >= 90 Days. Trip Time: Instantaneous. Bypass Time: None. Release after set. | Manual Reset Warning (Reset Password: 0726). Clear/Disable when Quarterly Service Warning is Disabled. Manual Reset of this warning shall be added into the Security Log with the message of “Quarterly Service Required Warning Reset”. Set Days Since Last Quarterly Service to 0 when this warning is cleared. | 2 |
| WARNING - YEARLY SERVICE REQUIRED - CONTACT JCI Event Code: 331 GPIC Warning Code: 146 |
Manual Reset Warning. Shutdown Type: None. Enable: Always. Allowed States: All. | Set when all of the following are true: • Days Since Last Yearly Service >= 365 Days • Operating Hours Since Last Yearly Service > 2,890 Hours (33% of a year’s run hours = 24*365*0.33) Trip Time: Instantaneous. Bypass Time: None. Release after set. |
Manual Reset Warning (Reset Password: 0726). Clear/Disable when Yearly Service Warning is Disabled. Manual Reset of this warning shall be added into the Security Log with the message of “Yearly Service Required Warning Reset”. When this warning is cleared: Set Days Since Last Yearly Service to 0, Set Operating Hours Since Last Yearly Service to 0, Set Purge Count Since Last Filter-Drier Replacement to 0. | 3 |
| WARNING - 3 YEAR SERVICE REQUIRED - CONTACT JCI Event Code: 332 GPIC Warning Code: 147 |
Manual Reset Warning. Shutdown Type: None. Enable: Always. Allowed States: All. | Set when Days Since Last 3 Year Service >= 1095 Days. Trip Time: Instantaneous. Bypass Time: None. Release after set. | Manual Reset Warning (Reset Password: 0726). Clear/Disable when 3 Year Service Warning is Disabled. Manual Reset of this warning shall be added into the Security Log with the message of “3 Year Service Required Warning Reset”. Set Days Since Last 3 Year Service to 0 when this warning is cleared. | 3 |
| WARNING - CONDENSER - HIGH SMALL TEMP DIFFERENCE Event Code: 13 GPIC Warning Code: 149 |
Manual Reset Warning. Shutdown Type: None. Enable: Always. Allowed States: Running. | Set when Condenser Small Temp Difference > Condenser Small Temp Difference Warning Threshold. Trip Time: 30 Minutes. Bypass Time: None. Release when Condenser Small Temp Difference <= Condenser Small Temp Difference Warning Threshold. | Manual Reset Warning (Reset Password: 0726). Clear/Disable when Condenser High Small Temp Difference Warning is Disabled. Manual Reset of this warning shall be added into the Security Log with the message of “Condenser High Small Temp Difference Warning Reset”. | 4 |
| WARNING - SYSTEM - REPLACE FILTER-DRIER Event Code: 333 GPIC Warning Code: 150 |
Manual Reset Warning. Shutdown Type: None. Enable: Always. Allowed States: All. | Set when Purge Count Since Last Filter-Drier Replacement >= 278. Trip Time: Instantaneous. Bypass Time: None. Release after set. | Manual Reset Warning (Reset Password: 0726). Clear/Disable when any of the following are true: System Replace Filter-Drier Warning is Disabled; Unit Model is not YZ. Manual Reset of this warning shall be added into the Security Log with the message of “System Replace Filter-Drier Warning Reset”. Set Purge Count Since Last Filter-Drier Replacement to 0 when this warning is cleared. | 8 |
PANEL FAULTS & WARNINGS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| MBC - HIGH ROTOR ELONGATION RATE Event Code: N/A GPIC Safety Fault Code: 83 |
Safety Fault. Shutdown Type: Immediate. Enable: When Rotor Elongation > 350 µm. Allowed States: Running, Soft Shutdown. | Set when either of the following are true: • Rotor Elongation Rate > Rotor Elongation Fault Low Rate for 3 Minutes • Rotor Elongation Rate > Rotor Elongation Fault High Rate for 1 Minute Bypass Time: 1 Minute. Trip Time: 1 Minute / 3 Minutes (see set criteria). Release when set criteria is not true. |
Clear/Disable: Never. Reset Password: None. Special Handling: None. | 12 |
VSD COOLING PROTECTION – FAULTS & WARNINGS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING - VSD - HIGH HX APPROACH TEMPERATURE Event Code: N/A GPIC Warning Code: 45 |
Manual Reset Warning. Shutdown Type: None. Enable: Always. Allowed States: Running, Soft Shutdown. | Set when VSD HX Approach Temp > Expected VSD HX Approach Temp + VSD HX Approach Temp Warning Offset. Bypass Time: 20 Minutes. Trip Time: 10 Minutes. Release when set criteria not true. | Clear/Disable when VSD Cooling Protection is Disabled. Reset Password: None. Special Handling: None. | 16 |
| VSD - HIGH HX APPROACH TEMPERATURE Event Code: N/A GPIC Safety Fault Code: 94 |
Safety Fault. Shutdown Type: Immediate. Enable: Always. Allowed States: Running, Soft Shutdown. | Set when VSD HX Approach Temp > Expected VSD HX Approach Temp + VSD HX Approach Temp Fault Offset. Bypass Time: 20 Minutes. Trip Time: 10 Minutes. Release when set criteria is not true. | Clear/Disable when VSD Cooling Protection is Disabled. Reset Password: None. Special Handling: None. | 16 |
From YMC2 Mod A and B Output Line Voltage Isolation Board, Drives and Starters SI0401
Original: docs.johnsoncontrols.com
OUTPUT LINE VOLTAGE ISOLATION BOARD SYMPTOMS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| High Phase (A B or C) Motor Current | High motor current at 4 seconds into run. | If one of the transformers has failed it can provide incorrect values to the VSD logic board, causing the VSD logic board to incorrectly control the VSD. | Check the condition of the three fuses supplying the board regardless of the fault experienced; if the output line voltage isolation board is suspected, the primary and secondary windings can be checked (Tables 1–4). | 1 |
| MBC – Speed Signal Fault | Cycling shutdown set when the MBC loses the speed signal that is expected from the VSD, or the speed signal is less than 10 Hz, while the MBC is commanded in Rotation Mode. | If the output line voltage isolation board transformer phase A has failed, this fault will occur. | The MBC Fault contacts open. The MBC remains in Levitation mode with the motor shaft levitated until commanded to de-levitate over the serial communication line. The shutdown is released when the MBC is out of Rotation mode or speed greater than 10 Hz is transmitted. A 10 second bypass exists when the initial command to Rotation Mode occurs. | 1 |
| WARNING – VSD – DC Bus Active | Warning displayed anytime the DC bus voltage is greater than 50 volts and the drive is not in the run state. | If related to the output line voltage isolation board: the transformer winding insulation with respect to ground is damaged, current will flow to ground and can cause a differential voltage to appear between the positive and negative bus. The magnitude of the voltage on the bus is dependent on the impedance with respect to ground. There are multiple conditions that could generate this message. | Work on this equipment should only be done by properly trained personnel who are qualified to work on this type of equipment. Check the condition of the three fuses supplying the board; if the output line voltage isolation board is suspected, the primary and secondary windings can be checked (Tables 1–4). | 1 |
| VSD – DC Bus Lockout – Do Not Cycle Power | Shutdown generated anytime the bus voltage should be zero, but it is greater than the threshold level based on the drive software version: 50 VDC before March of 2014 with software of C.HYP.03.02.02, C.HYP.04.02.02 and earlier; 100 VDC after March of 2014 with software of C.HYP.03.03.01, C.HYP.04.03.01 and later. | There are multiple conditions that could generate this message; if related to the output line voltage isolation board, the source could be the same as for WARNING – VSD – DC Bus Active (damaged transformer winding insulation with respect to ground allowing current flow to ground and a differential voltage between the positive and negative bus). | Do not cycle power. Check the condition of the three fuses supplying the board; if the output line voltage isolation board is suspected, the primary and secondary windings can be checked (Tables 1–4). | 2 |
| Incorrect Voltage Values on the VSD Details Screen | Incorrect values shown on the VSD details screen. Phase A output voltage signal is used for the speed reference; Phase B and C are displayed for reference on the VSD details screen but they do not impact the drive operation. All phases of output voltage should be balanced. | If phase B or C transformers were to fail, the result would be incorrect values on the VSD details screen but the machine could still operate. There are multiple conditions that could generate this message in addition to the output line voltage isolation board. | Refer to the drive service manual for assistance in determining the source of the issue. Check the condition of the three fuses supplying the board; if the output line voltage isolation board is suspected, the primary and secondary windings can be checked (Tables 1–4). | 2 |
From YMC2 Mod B Software Changes V11 SI0457
Original: docs.johnsoncontrols.com
FAULTS & WARNINGS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING - QUARTERLY SERVICE REQUIRED - CONTACT JCI | Quarterly Service Required Warning — Manual Reset Warning, no shutdown (Shutdown Type: None). Event Code: 330. GPIC Warning Code: 145. | Enable: Always. Allowed States: All. Bypass Time: None. Trip Time: Instantaneous. Set Event: Set when Days Since Last Quarterly Service >= 90 Days. | Release Event: Release after set. Manual reset required; Reset Password: 0726. Manual Reset of this warning shall be added into the Security Log with the message of “Quarterly Service Required Warning Reset”. Days Since Last Quarterly Service is set to 0 when this warning is cleared. Clear/Disable: Quarterly Service Warning is Disabled. | 2 |
| WARNING - YEARLY SERVICE REQUIRED - CONTACT JCI | Yearly Service Required Warning — Manual Reset Warning, no shutdown (Shutdown Type: None). Event Code: 331. GPIC Warning Code: 146. | Enable: Always. Allowed States: All. Bypass Time: None. Trip Time: Instantaneous. Set Event: Set when all of the following are true: • Days Since Last Yearly Service >= 365 Days • Operating Hours Since Last Yearly Service > 2,890 Hours (33% of a year’s run hours = 24*365*0.33) |
Release Event: Release after set. Manual reset required; Reset Password: 0726. Manual Reset of this warning shall be added into the Security Log with the message of “Yearly Service Required Warning Reset”. When this warning is cleared: Days Since Last Yearly Service is set to 0, Operating Hours Since Last Yearly Service is set to 0, and Purge Count Since Last Filter-Drier Replacement is set to 0. Clear/Disable: Yearly Service Warning is Disabled. | 3 |
| WARNING - 3 YEAR SERVICE REQUIRED - CONTACT JCI | 3 Year Service Required Warning — Manual Reset Warning, no shutdown (Shutdown Type: None). Event Code: 332. GPIC Warning Code: 147. | Enable: Always. Allowed States: All. Bypass Time: None. Trip Time: Instantaneous. Set Event: Set when Days Since Last 3 Year Service >= 1095 Days. | Release Event: Release after set. Manual reset required; Reset Password: 0726. Manual Reset of this warning shall be added into the Security Log with the message of “3 Year Service Required Warning Reset”. Days Since Last 3 Year Service is set to 0 when this warning is cleared. Clear/Disable: 3 Year Service Warning is Disabled. | 3 |
| WARNING - CONDENSER - HIGH SMALL TEMP DIFFERENCE | Condenser High Small Temp Difference — Manual Reset Warning, no shutdown (Shutdown Type: None). Event Code: 13. GPIC Warning Code: 149. | Enable: Always. Allowed States: Running. Bypass Time: None. Trip Time: 30 Minutes. Set Event: Set when Condenser Small Temp Difference > Condenser Small Temp Difference Warning Threshold. | Release Event: Release when Condenser Small Temp Difference <= Condenser Small Temp Difference Warning Threshold. Manual reset required; Reset Password: 0726. Manual Reset of this warning shall be added into the Security Log with the message of “Condenser High Small Temp Difference Warning Reset”. Clear/Disable: Condenser High Small Temp Difference Warning is Disabled. | 4 |
PANEL FAULTS & WARNINGS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| MBC - HIGH ROTOR ELONGATION RATE | MBC High Rotor Elongation Rate Fault — Safety Fault, Immediate shutdown. Event Code: N/A. GPIC Safety Fault Code: 83. | Enable: When Rotor Elongation > 350 µm. Allowed States: Running, Soft Shutdown. Bypass Time: 1 Minute. Trip Time: 1 Minute / 3 Minutes (see set criteria). Set Event: Set when either of the following are true: • Rotor Elongation Rate > Rotor Elongation Fault Low Rate for 3 Minutes • Rotor Elongation Rate > Rotor Elongation Fault High Rate for 1 Minute |
Immediate shutdown. Release Event: Release when set criteria is not true. Clear/Disable: Never. Reset Password: None. Special Handling: None. | 9 |
VSD COOLING PROTECTION — FAULTS & WARNINGS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING - VSD - HIGH HX APPROACH TEMPERATURE | VSD High HX Approach Temperature Warning — Manual Reset Warning, no shutdown (Shutdown Type: None). Event Code: N/A. GPIC Warning Code: 45. | Enable: Always. Allowed States: Running, Soft Shutdown. Bypass Time: 20 Minutes. Trip Time: 10 Minutes. Set Event: Set when VSD HX Approach Temp > Expected VSD HX Approach Temp + VSD HX Approach Temp Warning Offset. | Release Event: Release when set criteria not true. Reset Password: None. Special Handling: None. Clear/Disable: VSD Cooling Protection is Disabled. | 12 |
| VSD - HIGH HX APPROACH TEMPERATURE | VSD High HX Approach Temperature Fault — Safety Fault, Immediate shutdown. Event Code: N/A. GPIC Safety Fault Code: 94. | Enable: Always. Allowed States: Running, Soft Shutdown. Bypass Time: 20 Minutes. Trip Time: 10 Minutes. Set Event: Set when VSD HX Approach Temp > Expected VSD HX Approach Temp + VSD HX Approach Temp Fault Offset. | Immediate shutdown. Release Event: Release when set criteria is not true. Reset Password: None. Special Handling: None. Clear/Disable: VSD Cooling Protection is Disabled. | 13 |
UNIT WARNING CODES (SC.4)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 6 | WARNING - QUARTERLY SERVICE REQUIRED - CONTACT JCI | 7 | ||
| 7 | WARNING - YEARLY SERVICE REQUIRED - CONTACT JCI | 7 | ||
| 8 | WARNING - 3 YEAR SERVICE REQUIRED - CONTACT JCI | 7 | ||
| 9 | WARNING - CONDENSER - HIGH SMALL TEMP DIFFERENCE | 7 | ||
| 45 | WARNING - VSD - HIGH HX APPROACH TEMPERATURE | 18 |
UNIT SAFETY FAULT CODES (SC.2)
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| 83 | MBC - HIGH ROTOR ELONGATION RATE | 11 | ||
| 94 | VSD - HIGH HX APPROACH TEMPERATURE | 18 |
From YMC2 Model A Centrifugal Chiller Software Enhancement (v.2), Control Panel SI0256
Original: docs.johnsoncontrols.com
Expansion I/O – Serial Communication Fault
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Serial Communication Fault | Loss of serial communications with the Expansion I/O LTC I/O Board. In this software version the fault includes a timeout (previously it did not). | Communications from the LTC I/O Board are NOT received for 3 consecutive attempts with a 2 second timeout between attempts; the fault occurs if communications is NOT established within 6 seconds of the first attempt. | The fault is released automatically when a valid response is received from the LTC I/O Board. | 1 |
Condenser and Evaporator Flow Faults
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| CONDENSER – FLOW SWITCH OPEN | Cycling fault. In this software version this Standard Soft Shutdown fault has been changed to a Fast Soft Shutdown. | Set when the Condenser Flow Switch is open for 5 seconds when either the Chiller State is Running or the Chiller State is Soft Shutdown. | The fault will be released when the Condenser Flow Switch closes, or when the Run Permissive is False and the Chiller State is Stopped. | 2 |
| CHILLED LIQUID – FLOW SWITCH OPEN | Cycling fault. In this software version this Standard Soft Shutdown fault has been changed to a Fast Soft Shutdown. | Set when the Chilled Liquid Flow Switch is open for 5 seconds when any of the following are true: the Chiller State is Running; the Chiller State is Soft Shutdown; the Chiller State is MBC Startup and the time in the MBC Startup State is greater than 45 seconds. | The fault will be released when the Chilled Liquid Flow Switch closes, or when the Run Permissive is False and the Chiller State is Stopped. | 2 |
From YMC2 Style B V08 03630 OptiView Chiller Control Panel SI0393
Original: docs.johnsoncontrols.com
MOTOR COOLING
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| MOTOR – LOW WINDING TEMPERATURE | New low winding temperature fault added to prevent the chiller from running. | If resistor R261 on the 2911 VSD logic board fails open, all of the motor winding temperatures register at their minimum value (32°F); motor cooling control then closes the valve, allowing the windings and rotor to overheat. | Fault prevents the chiller from running; this message is displayed should the condition exist. | 1 |
RAPTYR VSD FAULTS
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| VSD - HIGH INTERNAL AMBIENT TEMPERATURE | Changed at the request of Field and PTS; previously this fault condition required a manual reset. Now a Cycling Fault, but if 3 occur within a 90 minute period it becomes a Safety Fault which will require user intervention and a manual clearing of the Fault Button. | 2 | ||
| VSD - LINE VOLTAGE PHASE ROTATION | Changed at the request of Field and PTS; previously this fault condition required a manual reset. Now changed to a Cycling Fault. | 2 | ||
| VSD - PHASE LOCKED LOOP | Changed at the request of Field and PTS; previously this fault condition required a manual reset. Now changed to a Cycling Fault. | 2 |
LOSS OF SUBCOOLER LIQUID SEAL WARNING
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| LOSS OF SUBCOOLER LIQUID SEAL WARNING | Program changed to only check for Loss of Subcooler Liquid Seal when the chiller is loaded above 40%FLA; there is no threat to the subcooler tubes when the chiller is loaded below 40% FLA, and previous versions of the software caused nuisance alarms at light loads. | 2 |
From YMC² Mod A 3630 OptiView Software V11 SI0555
Original: docs.johnsoncontrols.com
Fault Values
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| WARNING – CONDENSER OR VGD SENSOR FAILURE | Manual Reset Warning. Shutdown Type: None. (In software V11 this warning was corrected so that it is set whenever the set condition is satisfied.) | Set when the difference between the Condenser Pressure and Discharge Pressure is > 21 PSID or < -21 PSID. | Enable: Always; Clear/Disable: Never. Allowed States: Running. Bypass Time: None; Trip Time: 3 minutes. Release Event: releases when the set condition is not true. As a Manual Reset Warning, it must be manually reset. | 3 |
From YMC² Mod B 3630 OptiView Software V13A SI0554
Original: docs.johnsoncontrols.com
York Chiller Access Manager
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| You do not have the correct access level to make the change. | Access-level denial message shown when an attempted change is rejected. | Displayed in error when pressing the Maintenance Acknowledge button in Enhanced access with the correct password entered, so the warning could not be cleared. | Corrected in this software release. | 2 |
| Your Access Level Doesn’t Allow This. | Message shown when the current access level does not permit the attempted action. | Displayed in error when pressing the Page Down button on the Access Log screen in Enhanced access, so the next page would not display. | Corrected in this software release. | 2 |
VSD/MBC Initialization
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| VSD – Initialization In Progress Start Inhibit | Start inhibit displayed while VSD initialization is in progress. | Appeared after bootup and could not be cleared when updating software (earlier software versions). | This has been corrected in this software release. | 3 |
| MBC – Initialization in Progress Start Inhibit | Start inhibit displayed while MBC initialization is in progress. | Appeared after bootup and could not be cleared when updating software (earlier software versions); either this inhibit or the VSD one could appear. | This has been corrected in this software release. | 3 |
MBC
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| MBC – POWER FAIL LANDING | Fault set on the MBC. | Cleared using the Clear Fault button. Earlier software did not always display the Clear Fault button when this fault was set; this has been corrected in this software release. | 3 |
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