| Document type | Operation Guide |
|---|---|
| Document number | 160.84-OM1 |
| Equipment | YMC2 Magnetic Bearing Centrifugal Chiller |
| Brand | YORK |
| Revised | 2025-04-25 |
| File size | 4.7 MB |
Fault codes in this document
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 |
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