| Document type | Operation Guide |
|---|---|
| Document number | 160.95-O2 |
| Equipment | YK Centrifugal Chiller |
| Brand | YORK |
| Revised | 2025-10-14 |
| File size | 27.3 MB |
Fault codes in this document
Start inhibit messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Anti-recycle XX/sec | Anti-recycle setting enabled on the setup screen and the anti-recycle time has not yet elapsed; time remaining is displayed next to the message. Timer set active: LCSSS, MVSSS, and EM starters = 30 minutes from entering a run state or motor current >15% FLA; all variable speed compressor motor starters = 10 minutes from entering a run state, motor current >15% FLA, or VSD frequency >0 Hz. | For variable speed compressor motor drives, the start inhibit is set when any of the listed events occur five times before the 10 min timer expires. For all other starters, the start inhibit is set while the timer is active. | 185 | |
| LCSSS - High phase A, B, or C heatsink temperature - Stopped | Chiller stopped and the LCSSS trigger board detected the temperature of the phase A, B, or C (X in message) SCR module greater than 110°F (43.3°C). | The starter cooling pump runs and the chiller is inhibited from starting until the temperature decreases to less than 109°F (42.8°C). | 185 | |
| Setup - Line Frequency Not Set | The line frequency programmed on the setup screen is Invalid. | 185 | ||
| Setup – Line voltage not set | HYP model drives: the line voltage programmed on the setup screen is Invalid. | 186 | ||
| MVSSS - High heatsink 1, 2, or 3 temperature - Stopped | Temperature sensed on the stated phase stack has exceeded 194°F (90°C) while not running. | 186 | ||
| Motor controller – Initialization in progress | For Y.OPT.01.07.308 and later. OptiView is waiting for a response from the starter to initialize or re-initialize, based on certain events. Applies to all starters except EM. | While this fault is active, all motor controller data displayed on the screens must be replaced with XXX. | 186 | |
| Oil - High sump pressure - Stopped | Heat pump enabled and the oil sump pressure is greater than 133.0 psig. | Released when the oil sump pressure drops below 130.0 psig. | 186 | |
| Oil - Low temperature differential | Instantly set when the oil sump temperature minus the condenser saturation temperature is less than 40.0°F (4.4°C) when the oil pump is not running. | Released when the set criteria is no longer true. | 186 | |
| Oil - High dilution inhibit | Only applies when oil quality protection is enabled. Oil dilution is greater than the JCI Service programmable high dilution inhibit trip threshold (default 20.0%). | The chiller can start when the oil dilution is less than the high dilution start inhibit dilution trip threshold minus 0.2%. | 186 | |
| Oil - Low viscosity inhibit | Only applies when oil quality protection and oil cooling control are enabled. Oil viscosity is less than the JCI Service programmable low viscosity inhibit trip threshold (default 5.0 cSt) after 48 s of pre-lube. | The chiller can be restarted after the oil viscosity is greater than the low viscosity inhibit trip threshold plus 0.2 cSt. | 186 | |
| Compressor – PRV not calibrated | The PRVs have not been calibrated. | The message clears when the PRV calibration has successfully passed. | 187 | |
| Compressor – PRV motor switch open | The PRVs are not fully closed. | Inhibit is disabled when the PRV start position is greater than 0%. | 187 |
Warning messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Warning – Auto lube grease level low | Auto lube type is P203; the motor auto lube cycle has been in progress for 30 s and OptiView receives three low level inputs from the auto lube device in a 15 s window. The low level indicator is a magnetic switch that closes as the wiper arm in the luber passes over it. | Manual reset warning. | 188 | |
| Warning – Auto lube req’d on next shutdown | Auto lube type is P203; operating hours since last motor lube is greater than or equal to the lube required period. | Auto-reset. Clear at Standard access or higher by entering initials, name, or user ID using the Motor Lube Acknowledge key on the Motor Lubrication Screen; date/time logged as date/time of last motor lubrication and operating hours since last lubrication reset to zero. Not displayed if the auto lube setpoint on the motor lubrication screen is enabled. | 189 | |
| Warning - Check oil system | Oil pump frequency command is greater than 50 Hz for 30 min consecutively. | Manual reset: reset when the frequency command is less than or equal to 50 Hz and the Clear button on the System Details Screen is pressed. | 189 | |
| Warning – Compressor – Low discharge superheat limit | Compressor discharge superheat has decreased to the capacity control discharge superheat override of less than 8°F (4.4°C) for 30 s. | Auto-reset: releases when the discharge superheat increases above 10°F (5.6°C). | 189 | |
| Warning – Condenser – Freeze threat from low pressure | Chiller not running, condenser saturation temperature less than 34°F (1.1°C) and drop leg temperature less than 35°F (1.7°C). | Auto-reset: resets if the chiller is started, the condenser saturation temperature is greater than 36°F (2.2°C), or the drop leg temperature is greater than 38°F (3.3°C). | 189 | |
| Warning – Condenser – High pressure limit | Condenser pressure exceeds the high pressure warning setpoint threshold. | While in effect, the PRVs are inhibited from further opening. Automatically clears and the PRVs are permitted to open when the condenser pressure decreases to 5 psig below the setpoint. | 189 | |
| Warning - Condenser - High small temperature difference | Condenser small temperature difference is greater than the condenser small temperature difference warning threshold (service programmable, default 8.0°F, on the maintenance screen). | Manual reset: reset when the difference is less than or equal to the threshold, the Maintenance Acknowledge key is pressed, Cond High Small Temp Diff is selected, and the code 0726 is entered. | 190 | |
| Warning – Condenser – Liquid level stability | After 30 min of running, a 10 min condenser liquid level minimum/maximum window starts; the difference between minimum and maximum level is compared to the liquid level stability threshold (JCI Service programmable 20%–80%, default 20%). Difference greater than the threshold for three consecutive 10 min windows sets this warning. | Manual reset: reset when the difference is less than the threshold for 10 min and the Clear button on the System Details Screen is pressed. | 190 | |
| Warning – Condenser or evaporator XDCR error | After 10 min of running, the evaporator pressure transducer indicates a higher pressure than the condenser pressure transducer — indicative of a condenser or evaporator transducer failure. Not checked in brine mode. | Displayed until the condition clears and the Clear button on the System Details Screen is pressed. | 190 | |
| Warning - Condenser or VGD sensor failure | Difference between the discharge/stall pressure transducer and the condenser pressure transducer is greater than 21 psid or less than -21 psid for 3 min continuously (both transducers measure essentially the same pressure). | Displayed until the condition clears and the Clear button on the System Details Screen is pressed. While displayed, the VGD is driven to the full open position and held until the warning is cleared; when cleared, the VGD returns to normal operation. | 190 | |
| Warning – Conditions override VGD | An extreme stall condition detected while running: stall detector voltage exceeds twice the high limit setpoint for the duration programmed in the extreme stall duration setpoint (10 min to 20 min). Protects the VGD ring from damage. Not checked while the VGD is in manual control, fully closed (limit switch closed), or the PRV position is greater than the PRV VGD inhibit setpoint. | While displayed, the compressor VGD is driven to the full open position and held until the message is cleared. Cleared after the stall detector voltage returns to less than two times the high limit setpoint and the Clear button on the System Details Screen is pressed. | 191 | |
| Warning – Control panel – Internal error | Software detects an error in the timing of the internal processing. Does not impact any functions; indicates there may be an issue slowing down the process (hardware, software, or external influence). | Auto reset warning. | 191 | |
| Warning – Excess surge detected | Applies only if the surge protection shutdown is disabled and any of: hot gas disabled (SSS/EM), hot gas enabled with HGBP valve command 100% (SSS/EM), hot gas disabled with VSD at maximum frequency, hot gas enabled with HGBP 100% and VSD at maximum frequency — and the surge window count has exceeded the count limit. | Manually cleared after the surge window count is less than or equal to the count limit, or the event has been set for more than 10 min, or the chiller is not running; press the Clear button on the System Details Screen. | 192 | |
| Warning – External I/O – Serial communication | Microboard has not received valid communication from the optional LTC I/O board for 12 consecutive attempts with a 2 s timeout between attempts (approximately 24 s). Required for: heat recovery, oil sump condenser (high temperature heat pump), hot gas liquid injection, isolation valves, variable water outlet control, and oil cooling control when the oil cooling control source is LTCIO. | Automatically resets when a valid response is received. | 192 | |
| Warning – High auxiliary condenser pressure | High temperature heat pump oil sump condenser enabled and the auxiliary condenser pressure >140.0 psig while running. | Auto-reset: resets when the pressure drops below 120.0 psig. | 192 | |
| Warning – Harmonic filter – Data loss | Communications between the harmonic filter logic board and the compressor motor VSD logic board is not occurring. | All filter related parameters display as X. Automatically clears when communications are restored. | 192 | |
| Warning – Harmonic filter – Input frequency range | Power line frequency detected by the VSD harmonic filter is outside 58 Hz to 62 Hz (default 60 Hz) or 49 Hz to 51 Hz (default 50 Hz). | All filter related parameters display as X. Automatically clears when the line frequency is within range. | 193 | |
| Warning – Harmonic filter – Invalid model | On power up the VSD checks that the filter model reported by the filter is correct; the reported model is not correct. | While displayed, the VSD runs with the filter disabled. Clears when the filter is inhibited on the VSD Screen or the VSD receives the correct model from the filter on the next power up. | 193 | |
| Warning – Harmonic filter – Not running | All of the following true for 20 s continuously: chiller running, filter enabled, filter present status true, Run Time greater than 20 seconds, filter operating mode is stopped. | Released when the condition clears, or the chiller is stopped, but is displayed until manually cleared using the Clear button on the System Details Screen. | 193 | |
| Warning – Harmonic filter – Operation inhibited | A harmonic filter is present and has been inhibited on the VSD Screen. All harmonic filter data is still displayed. Harmonic filter operation must only be altered by a qualified service technician. | Auto-reset warning. | 193 | |
| Warning – Liquid level setpoint not achieved | Refrigerant level is not within ±15% of the refrigerant level setpoint for 10 continuous min after the chiller has been running for 30 min. | Auto-reset: clears when the refrigerant level is within the 15% range or the chiller is stopped. | 193 | |
| Warning – Loss of subcooler liquid seal | Chiller running greater than 30 min and the subcooler effectiveness is less than the subcooler effectiveness low threshold with input FLA greater than 40%; or the subcooler effectiveness is more than the subcooler effectiveness high threshold, the drop leg temperature is less than the ECLT minus 0.5°F, and the input FLA is greater than 40%. | Manual reset: press the Clear button on the System Details Screen. | 193 | |
| Warning – MMB – Serial communications | Microboard has not received valid communication from the optional motor monitoring board for 12 consecutive attempts with a 2 s timeout between attempts (approximately 24 s). | Automatically resets when a valid response is received. | 194 | |
| Warning – Motor – Auto lube failed | Auto lube type is P203; the Warning – Auto lube grease low warning is set in the first half of the motor auto lube duration after the lube cycle is complete, or the Cancel Auto Lube key is pressed during the cycle. | Manual reset warning. | 194 | |
| Warning – Motor – Bearing vibration baseline not set | Shaft end and opposite shaft end motor bearing vibration baseline values have not been entered on the motor details screen. | Displayed until both baselines are entered, either manually with the manual baseline setpoint or automatically with the Auto Baseline key. While displayed, the vibration baseline values are set to X.X. | 194 | |
| Warning – Motor – High bearing temperature | Either of the enabled motor bearing temperatures exceeds the programmed High Bearing Temperature Warning for 3 s continuously. Does not occur when bearing temperature protection is set to disabled; does not act on RTD inputs registering as open. | Automatically clears when all bearing temperatures decrease below the warning threshold. | 194 | |
| Warning – Motor – High bearing vibration | Either the shaft end or opposite shaft end motor bearing vibration has exceeded the value programmed for the high vibration warning setpoint for the programmed number of delay seconds. Does not occur when motor vibration protection is disabled or while the Baseline Not Set warning is displayed. | Automatically clears when both vibration values decrease below the warning threshold. | 194 | |
| Warning – Motor – High winding temperature | Any of the enabled motor winding temperatures exceed the high winding temperature shutdown threshold minus 18°F (-7.8°C) for 3 s continuously. Does not occur when winding temperature protection is disabled; does not act on open RTDs or individually disabled winding sensors. | Automatically clears when all winding temperatures decrease below the warning threshold. | 195 | |
| Warning – Motor - Bearing lube required | Operating hours since last motor lubrication exceeds the set hours. Replaces Warning – Motor bearing lube suggested. Not displayed if the auto lube type is none. | Displayed until manually cleared by the operator, or until the operating hours exceed the set hours plus 200, when it is replaced by the fault Motor – Lack of bearing lubrication. Clear by entering initials, name, or user ID using the Motor Lube Acknowledge key on the Motor Lubrication Screen; date/time logged and operating hours since last lubrication reset to zero. | 195 | |
| Warning – Motor - Bearing lube suggested | Operating hours since last motor lubrication exceeds the set hours. Not displayed if the auto lube type is none. | Displayed until manually cleared by the operator, or until the operating hours exceed the set hours plus 200, when it is replaced by Warning - Motor bearing lube required. Clear at Standard access or higher by entering initials, name, or user ID using the MOTOR LUBE ACKNOWLEDGE key on the Motor Lubrication Screen; date/time logged and operating hours since last lubrication reset to zero. | 195 | |
| Warning – Motor – Bearing lube not done | Auto lube type is none or P203 and the motor lube shutdown is disabled; operating hours since last motor lubrication is greater than the lube required period plus 200 hours. | Clear by entering initials, name, or user ID using the Motor Lube Acknowledge key on the Motor Lubrication Screen; date/time logged and operating hours since last lubrication reset to zero. | 196 | |
| Warning – Motor – Oil change suggested | Auto lube type is sleeve and the operating hours since last motor lubrication is greater than or equal to 4,000 hours. | Displayed until manually cleared, or until the operating hours exceed the set hours, when it is replaced by Warning – Motor – Oil change required. Clear by entering initials, name, or user ID using the Motor Lube Acknowledge key; date/time logged and operating hours since last lubrication reset to zero. | 196 | |
| Warning – Motor – Oil change required | Auto lube type is sleeve and the operating hours since last motor lubrication is greater than or equal to 5,000 hours. Replaces Warning – Motor – Oil change suggested. | Displayed until manually cleared, or until the operating hours exceed the set hours plus 1,000, when it is replaced by the safety fault Motor – Lack of bearing oil change. Clear by entering initials, name, or user ID using the Motor Lube Acknowledge key; date/time logged and operating hours since last lubrication reset to zero. | 196 | |
| Warning – Motor – Oil change not done | Auto lube type is sleeve and the motor lube shutdown is disabled; operating hours since last motor lubrication is greater than or equal to 6,000 hours. | Clear by entering initials, name, or user ID using the Motor Lube Acknowledge key on the Motor Lubrication Screen; date/time logged and operating hours since last lubrication reset to zero. | 197 | |
| Warning – Oil – High supply temperature | Oil cooling control enabled; after 30 min of running, the oil supply temperature is 10°F (5.6°C) higher than the oil supply temperature setpoint for 1 min continuously. | Auto reset: resets when the oil supply temperature is lower than the oil supply temperature plus 5.0°F (2.8°C). | 197 | |
| Warning – Oil – Low supply temperature | Oil cooling control enabled; after 30 min of running, the oil supply temperature is 15°F (8.3°C) lower than the oil supply temperature setpoint for 1 min continuously. | Auto reset: reset when the oil supply temperature is higher than the trip threshold. | 197 | |
| Warning – Oil – High sump pressure | Heat pump mode enabled. Displayed when the chiller has been running less than 10 min and the oil sump pressure is greater than 132.0 psig for 10 s; also when running 10 min and the oil sump pressure is greater than 103.0 psig for 10 s; or instantly when the oil sump pressure is greater than 200 psig at any time. | Auto reset: clears if the chiller is stopped, the chiller has been running less than 10 min and the oil sump pressure is less than 130.0 psig, or the chiller has been running 10 min and the oil sump pressure is less than 100.0 psig. | 197 | |
| Warning – Quarterly service required – Contact JCI | Days since last quarterly service is equal to or greater than 90 days. | Manual reset: reset when the Maintenance Acknowledge key is pressed, Quarterly Service is selected, and the code 0726 is entered; also resets the quarterly service timer to 0. | 197 | |
| Warning - Yearly service required - Contact JCI | Days since last yearly service is equal to or greater than 365 days, or operating hours since last yearly service is greater than 2,890 hours (33% of a full year’s run hours). | Manual reset: reset when the Maintenance Acknowledge key is pressed, Yearly Service is selected, and the code 0726 is entered; also resets both the yearly service days and hours timers to 0. | 198 | |
| Warning - 3 year service required - Contact JCI | Days since last 3 year service is equal to or greater than 1,095 days. | Manual reset: reset when the Maintenance Acknowledge key is pressed, 3 Year Service is selected, and the code 0726 is entered; also resets the 3 Year Service timer to 0. | 198 | |
| Warning – Sales order – Invalid serial number | The unit serial number is blank on the Sales Order Screen. | Auto-reset: clear by entering a serial number. | 198 | |
| Warning – Standby lube – Low oil pressure | A minimum of 15 psid of oil pressure was not achieved in the first 30 s of a standby lubrication cycle, or the pressure decreased below this value during the remainder of the cycle. Also set when either the pump oil pressure transducer or the sump oil pressure transducer is less than 2 psig when a standby lube is requested by automatic control (inhibits the standby lube cycle when the chiller is open to atmosphere). | Message is displayed and no further standby lubrications are performed until the Clear button is pressed on the System Details Screen. | 198 | |
| Warning – Standby lube – Inhibited | The oil pump pressure is less than 2 psig, the oil sump pressure is less than 2 psig, the Oil – Pump pressure transducer out of range safety fault is set, or the Oil – Sump pressure transducer out of range safety fault is set. | Auto-reset: reset when the set criteria are not true. | 198 | |
| Warning – Surge protection – Excess surge limit | Applies only if the surge protection extended run feature is enabled and any of: hot gas disabled (SSS/EM), hot gas enabled with HGBP valve command 100% (SSS/EM), hot gas disabled with VSD at maximum frequency, hot gas enabled with HGBP 100% and VSD at maximum frequency. Begins when the surge window count exceeds the count limit; during the 10 min period the PRVs are driven closed. | When 10 min have elapsed, the message and the PRV load inhibit are automatically cleared; also cleared when the chiller is shutdown. | 199 | |
| Warning – VSD – Input voltage imbalance | Variable speed compressor motor drive is a HYP model and the input voltage imbalance is greater than or equal to 5%. | Auto-reset warning. | 199 |
Cycling faults
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Condenser – Flow switch open | The condenser flow switch (and the heating condenser flow switch for heat recovery chillers) has remained open for 5 s continuously while the chiller was running. | The chiller automatically restarts when the flow switch closes. While active, the condenser pump relay contacts (TB2-150/151) remain closed until the chiller is given a stop command or has another fault. | 200 | |
| Condenser – Freeze threat – Flow switch open | The condenser flow switch has remained open for more than 1 min while the chiller is stopped, and the condenser saturation temperature is less than 34.0°F (1.1°C) and the drop leg temperature is less than 35.0°F (1.7°C). | Released if the condenser flow switch is closed, the condenser saturation temperature is greater than 36.0°F (2.2°C), or the drop leg temperature has been greater than 36.0°F (2.2°C) for 5 min consecutively. | 200 | |
| Control panel – Power failure | When the power failure restart is auto, this is a cycling fault: a control power failure has occurred. | If the power failure occurred while running, the chiller automatically restarts when power is restored. If the failure duration was less than the applicable coastdown period when power is restored, the remainder of the coastdown is performed before starting. | 200 | |
| Control panel – Loss of control voltage | When the power failure restart is auto, this is a cycling fault: the line power input signal at I/O board TB3-30 was low for 1 s continuously. This signal determines when digital inputs are affected by a line power loss as opposed to an actual condition. | 201 | ||
| Control panel – Schedule | Schedule feature enabled; the chiller has been shut down in accordance with the schedule entered. | The unit restarts at the next scheduled start time. | 201 | |
| Evaporator – Low pressure - Smart freeze | Evaporator pressure has decreased to the capacity control low pressure override with the Warning - Evaporator - Low press limit active, and capacity control is not able to increase the evaporator pressure within 2 min. | If the chiller was running, it automatically shuts down and then restarts. If this cycling fault happens three times within 90 min a safety fault is set. | 201 | |
| Isolation valves – Not closed | Isolation valves enabled on the setup screen; the isolation close output relay on LTC I/O TB16 has been energized for more than 40 s and the isolation valve closed digital input on LTC I/O board TB18-1,2 is low. | Released when the closed digital input is high. | 201 | |
| Leaving chilled liquid – Flow switch open | The chilled liquid flow switch has remained open for 5 s continuously while the chiller was running, or failed to close during the last 5 s of the system prelube period. | The chiller automatically restarts when the flow switch closes. While active, the evaporator pump relay contacts (TB2-44/45) remain closed until the chiller is given a stop command or has another fault. | 202 | |
| Chilled liquid – Flow switch open | The chilled liquid flow switch has remained open for 5 s continuously while the chiller was running, or failed to close during the last 5 s of the system prelube period. | The chiller automatically restarts when the flow switch closes. While active, the evaporator pump relay contacts (TB2-44/45) remain closed until the chiller is given a stop command or has another fault. | 202 | |
| Leaving chilled liquid – Low temperature | The leaving chilled liquid temperature has decreased to the programmed shutdown temperature setpoint. In heat pump heating mode, additional logic causes this shutdown when the LCHLT decreases below the programmed heating LCHLT shutdown temperature setpoint. | If running, the PRVs are driven fully closed before shutting down the chiller. The chiller automatically restarts when the temperature increases to the programmed restart temperature setpoint. | 202 | |
| Leaving condenser liquid – High temperature | The leaving condenser liquid temperature has increased to the programmed heating shutdown temperature setpoint. Only applicable when heat pump duty is enabled and operating in heating mode. When the heating setpoint is decreased, the shutdown threshold becomes 125°F (51.7°C) for the next 10 min, then becomes the programmed setpoint value. | The heat pump automatically restarts when the temperature decreases to the programmed heating restart temperature setpoint. | 202 | |
| Motor controller - Initialization failure | When AC power is restored after a power failure, the control center attempts to establish serial communications with the starter; communications are not established in 10 consecutive attempts. Applies to all starters that communicate through Modbus or fiber optic comms. | A cycling shutdown is performed; the control center continues attempting to establish communications until successful. | 202 | |
| Motor controller – Fault contacts open | The motor controller fault contacts connected to TB6-16 and TB6-53 in the OptiView Control Panel have opened. Applies to all starters. | The chiller automatically restarts if it was running when the fault occurred. | 203 | |
| Motor controller – Loss of current | Compressor motor current decreased to 10% FLA for 25 s continuously while running — possibly caused by the starter de-energizing during run or a defect in the motor current feedback circuitry. Applies to all starters. | The chiller automatically restarts at the completion of system coastdown. | 203 | |
| Motor controller – Serial communications | Communications between the control center microboard and the starter cause no response over three consecutive attempts (approximately 6 sec). Applies to all starters that communicate through Modbus or fiber optic comms. | Released when a valid response is received; the chiller automatically restarts if it was running. | 203 | |
| Motor – Auto lube in progress | Auto lube type is P203 and the lubrication cycle is in progress, either automatically or manually initiated when the Start Auto Lube key is pressed. | This cycling shutdown remains in effect until the P203 auto luber has completed a lubrication cycle or is manually canceled. | 203 | |
| Motor – Lack of bearing lubrication | Auto lube type is P203 and the operating hours since last motor lubrication has exceeded the setpoint hours plus 200. Replaces Warning - Motor bearing lube required. | This cycling shutdown remains in effect until the P203 auto luber has completed a lubrication cycle. | 203 | |
| Multiunit cycling – Contacts open | The multiunit cycling contacts on the I/O board TB4-9 have opened to initiate a cycling shutdown. | If running, the PRVs are driven fully closed before shutting down the chiller. The chiller automatically restarts when the contacts close. | 203 | |
| Oil – Low sump temperature | The oil temperature has decreased to less than or equal to 55°F (12.8°C). | The chiller automatically restarts when the temperature increases above 56°F (13.3°C). | 203 | |
| Oil – Variable speed pump – Drive contacts open | The oil pump VSD has shut down the chiller by opening its status contacts connected to the I/O board TB3-70. The drive initiates a shutdown anytime its internal protection circuits do not permit the drive to run; the red LED on the drive board blinks. Refer to the label inside the VSOP cabinet. | The contacts remain open until the internal protection circuits are satisfied it is safe to operate; some drive-initiated shutdowns require AC power to be cycled to clear the fault. The chiller automatically restarts when the contacts close. | 204 | |
| Power fault | EM starter applications only. After the chiller has been running for 75 s, the CM-2 board has shut down the chiller to protect the motor from a transient torque condition; the CM contacts in the CM-2 board momentarily opened for less than 3 s (connected between TB6-16 and TB6-53). The power fault LED on the CM-2 illuminates. | The chiller automatically restarts when the contacts close. | 204 | |
| Proximity probe – Low supply voltage | The +24 VDC power supply voltage to the proximity probe has decreased to +19.0 VDC, below the minimum level required for reliable operation. Only applies to compressors that use proximity thrust bearing protection. | The chiller automatically restarts when the voltage increases to greater than or equal to 19.7 VDC. | 204 | |
| Setup - Refrigerant type not set | The refrigerant type is set to invalid on the Setup Screen. | The fault clears when a refrigerant type has been selected. | 204 | |
| System cycling – Contacts open | The system cycling contacts on the I/O board TB4-13 have opened to initiate a cycling shutdown. | If running, the PRVs are driven fully closed before shutting down the chiller. The chiller automatically restarts when the contacts close. | 204 |
Liquid cooled solid state starter
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| LCSSS – Serial receive | After communications were successfully established in the initialization process, the LCSSS does not receive a response from the control center after 10 consecutive attempts (approximately 20 sec) to communicate with the control center. | 205 | ||
| LCSSS – Power fault | The LCSSS logic/trigger board detected that the compressor motor current in one or more phases has decreased to less than 10% of the FLA for a minimum of one line cycle. Check is inhibited during the first 4 s of system run and until the motor current is greater than 25% of the job FLA. | The chiller automatically restarts upon completion of system coastdown. | 205 | |
| LCSSS – Low phase A, B, or C temperature sensor | The LCSSS logic/trigger board detected that the temperature of the phase A, B, or C (X in message) SCR module has decreased to less than 37°F (2.8°C) — generally a disconnected or defective sensor. If all three SCR modules indicate less than 37°F (2.8°C), the SCR module cooling pump turns on (accomplished by disconnecting all three sensors). | This feature allows service technicians to run the cooling pump while filling the cooling system by disconnecting plugs P2, P3, and P4 in the LCSSS. | 205 | |
| LCSSS - Run signal | The LCSSS receives two start signals from the control center simultaneously — one through the serial communications link and one through the start relay on the I/O board to TB6-24 — and they are not received within 5 s of one another. | A cycling shutdown is performed. | 205 | |
| LCSSS – Invalid current scale selection | An invalid compressor motor current scale jumper combination is installed in the LCSSS logic/trigger board J1. Allowable 100% FLA setpoint ranges: 7L – 35 to 260 A; 14L – 65 to 510 A; 26L – 125 to 850 A; 33L – 215 to 1050 A. | The chiller is permitted to start when the jumpers are configured correctly. Refer to Solid State Starter (Mod B) – Operation and Maintenance (Form 160.00-O2) for valid jumper configurations. | 206 | |
| LCSSS – Phase locked loop | The LCSSS logic/trigger board phase locked loop circuit was unable to maintain lock with phase A of the power line; a power line anomaly can cause such a sag or jitter. A power line frequency jitter of up to 3 Hz/s can be tolerated. | The chiller automatically restarts when lock has resumed. | 206 | |
| LCSSS – Low supply line voltage | The LCSSS logic/trigger board detected that the compressor motor AC power line voltage, in any phase, decreased below the low line voltage threshold continuously for 20 s. Shutdown/restart thresholds: 200–208 V: 160/174; 220–240 V: 185/200; 380 V: 305/331; 400 V: 320/349; 415 V: 335/362; 440–480 V: 370/400; 550–600 V: 460/502; Disabled: none. | The chiller automatically restarts when the voltage in all phases returns to the restart level. | 206 | |
| LCSSS – High supply line voltage | The LCSSS logic/trigger board detected that the compressor motor AC power line voltage, in any phase, exceeded the high line voltage threshold continuously for 20 s. Shutdown/restart thresholds: 200–208 V: 227/226; 220–240 V: 262/261; 380 V: 415/414; 400 V: 436/435; 415 V: 454/453; 440–480 V: 524/523; 550–600 V: 655/654; Disabled: none. | The chiller automatically restarts when the voltage in all phases returns to the restart level. | 207 | |
| LCSSS – Logic board processor | Communication between the microprocessor and digital signal processor (DSP) on the LCSSS logic/trigger board has been interrupted. | The chiller automatically restarts when communications are restored. | 207 | |
| LCSSS – Logic board power supply | Following the application of power. | The message is displayed and a snapshot of the LCSSS parameters and time of power failure are sent to the control center. | 207 | |
| LCSSS – Phase loss | The LCSSS logic/trigger board detected the line-to-line RMS voltage in any phase has decreased to less than or equal to 30% of the lowest value of the programmed voltage range. If the programmed voltage range is disabled, a value of 60 VAC is used as the threshold. | The chiller automatically restarts when the line voltage is greater than the shutdown threshold. | 207 |
Medium voltage solid state starter cycling fault messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| MVSSS – Low supply line voltage | The starter controller board has detected that the power line voltage (L1 to L2, L2 to L3, or L3 to L1) is less than 19% below the rated voltage for 20 s. | Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 208 | |
| MVSSS – High supply line voltage | The starter controller board has detected that the power line voltage (L1 to L2, L2 to L3, or L3 to L1) is greater than 13.2% above the rated voltage for 20 s. | Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 208 | |
| MVSSS – Run signal | The starter controller board receives two start signals from the control center simultaneously — one through the serial communications link and one through the start relay on the I/O board to TB6-24. | Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 208 | |
| MVSSS – Power fault | One or more phases of motor current has dropped below 10% of FLA for two line cycles. This fault is inhibited for the first 4 s of starting, and until all phase currents have reached 25% FLA. | Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 208 | |
| MVSSS – Phase loss | The drive controller board has detected a single phase has dropped more than 30% below the rated value. | Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 209 | |
| MVSSS – Logic board power supply | Generated by the starter controller board when it detects that the control power has dropped below the operational limit. | Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 209 | |
| MVSSS – Serial receive | Set if the starter controller board has lost Modbus communications from OptiView for more than 60 s. | Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 209 |
Medium voltage variable speed drive cycling fault messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| VSD - High instantaneous current | Two of the three output lines (T1 and T3) to the motor are continuously monitored by two DC current transformers; the third phase (T2) is derived. The three phases of instantaneous output current are compared to an instantaneous limit of 233% of the drive’s 100% FLA rating (see Table 177 for per-model trip values). The peak instantaneous current trip limit was exceeded. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 210 | |
| VSD - Initialization failed | When a run signal is received from the control panel, the drive performs an operational check of the DC current transformers monitoring the current flow to the motor; the drive determines that the transformers are not operational. | The system cannot start and a cycling shutdown is initiated. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 211 | |
| VSD - DC bus voltage imbalance – XY | X denotes the power cell phase location (A, B, or C) and Y the location of the cell within that phase (U upper or L lower). The absolute value of the difference between the positive and negative bus voltages on all phases must remain within 413 VDC (25% of 1,650 VDC); it exceeded this range continuously for 3 ms. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 211 | |
| VSD - Precharge - DC bus voltage imbalance – XY | X denotes the power cell phase location (A, B, or C) and Y the location of the cell within that phase (U upper or L lower). During precharge, the absolute value of the difference between the positive and negative bus voltages on all phases must remain within 0 VDC to 248 VDC (15% of 1,650 VDC); it exceeded this range continuously for 3 ms. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 211 | |
| VSD - Precharge - Low DC bus voltage | During precharge, all DC bus voltages are compared to a threshold of 330 VDC (20% of 1,650 VDC) 0.5 s after initiation of precharge; all DC bus voltages did not meet or exceed the 330 VDC threshold. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 211 | |
| VSD - Gate driver - XYZ | X denotes the power cell phase location (A, B, or C), Y the location of the IGBT in the pole in relation to its connection (N neutral or M motor), and Z the location relative to the internal neutral connection (U upper or L lower). The voltage across the IGBT is too high; the gate driver board determines this shutdown and provides feedback to the MVVSD controller board. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 212 | |
| VSD - Run signal | Redundant run signals are generated by the OptiView Control Center — one through the start relay on the I/O board to TB6-24 and one through the serial communications link. When the MVVSD receives either run command a 5 s timer starts; it did not receive both run commands within 5 s. | The MVVSD initiates this shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 212 | |
| VSD - Input power supply | The 120 VAC control supply feeding the various DC power supplies powering the MVVSD controls circuitry dropped to a nominal trip threshold of 84 VAC; additionally, the RMS value of the transformer input voltage dropped to 70% of the nameplate voltage rating of the drive. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 212 | |
| VSD - High DC bus voltage - XY | X denotes the power cell phase location (A, B, or C) and Y the location of the cell within that phase (U upper or L lower). All DC bus voltages are continuously monitored and compared to an over-voltage trip level of 2,063 VDC (125% of 1,650 VDC); a DC bus voltage exceeded this level. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 212 | |
| VSD - Low DC bus voltage | All DC bus voltages are continuously monitored; one of the voltages dropped below a threshold level of 1,238 VDC (75% of 1,650 VDC) continuously for 30 ms. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 212 | |
| VSD - Loss of cooling fan | Any of the fan motor supply voltage is below the minimum threshold, or the manual fan motor starter is in the off mode, or the thermal overload is tripped. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 212 | |
| VSD - Single phase input power | The drive monitors each of the three phase line-to-line voltages; the RMS voltage of any of the three inputs dropped below 75% of the drive’s nameplate voltage rating. | The drive initiates a cycling shutdown. Messages automatically clear when the fault condition no longer exists; if the chiller was running when the fault occurred, it automatically restarts. | 213 |
Variable speed compressor drive cycling fault messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| VSD – 105% motor current overload | HYP model drives only. The VSD logic board detects that at least one of the three output phase currents has exceeded 105% of the chiller’s FLA value for greater than 40 s. | Cycling shutdown. If three 105% motor current overload cycling faults occur on any phase within 90 min, the third fault in the 90 min period causes a safety shutdown. | 214 | |
| VSD – High Phase A, B, or C input current | HYP model drives. The stated phase input current exceeds 2,796 A. | Cycling shutdown. If three high input current cycling faults occur on any phase within 90 min, the third fault in the 90 min period causes a safety shutdown. | 214 | |
| VSD – High Phase A, B, or C motor current | HYP model drives. The stated phase motor current exceeds 2,164 A. | Cycling shutdown. If three high motor current cycling faults occur on any phase within 90 min, the third fault in the 90 min period causes a safety shutdown. | 215 | |
| VSD – High phase A, B, C instantaneous current | TM, VSD, and LVSD model drives. The motor current on that phase exceeds the given limit, sensed by current transformers on the VSD output pole assemblies. Maximum instantaneous currents: 351/292 – 771 A; 503/419 – 1,200 A; 790/658 – 1,890 A; 1055/914 – 2,749 A; 1300/1100 – 3,265 A. If the chiller restarts and runs fine, the cause is a voltage sag on the utility power feeding the VSD beyond the specified voltage range (especially at or near full load). If the chiller keeps tripping on this shutdown, an output pole problem is the most likely cause. | If the restart succeeds after a voltage sag, no further action indicated. If the chiller does not restart and keeps tripping, the VSD requires service. If this cycling shutdown occurs three times in 90 min, the third shutdown becomes a safety shutdown. | 215 | |
| VSD – Phase A, B, C gate driver | TM, VSD, and LVSD model drives. Second level of current protection on the VSD driver boards: the collector-to-emitter saturation voltage of each IGBT is checked continuously while gated on; the voltage across the IGBT exceeded the set threshold, so the IGBT is gated off and a shutdown pulse is sent to the VSD logic board shutting down the entire VSD system. Can be initiated when the VSD is not running. | 215 | ||
| VSD – Phase A, B, C motor gate driver | HYP model drives. One of the motor gate driver power supplies is operating outside of tolerance, or the voltage across the motor IGBT is too high; the gate driver board determines this shutdown and provides feedback to the VSD logic board. | 216 | ||
| VSD – Phase A, B, C input gate driver | HYP model drives. One of the input gate driver power supplies is operating outside of tolerance, or the voltage across the input IGBT is too high; the gate driver board determines this shutdown and provides feedback to the VSD logic board. | 216 | ||
| VSD – Single phase input power | All model drives. Generated by the SCR trigger control and relayed to the VSD logic board when the RMS value of any one of the three line-to-line voltages falls below the low limit in any half cycle. For HYP model drives the voltage and fault detection are all done by the VSD logic board. Low limits: 400–460 VAC TM/VSD – 230 VAC; 575 VAC TM/VSD – 300 VAC; 380 VAC or 415 VAC HYP – 264 VAC; 460 VAC HYP – 295 VAC. | 216 | ||
| VSD – High DC bus voltage | All model drives. The VSD DC bus voltage is continuously monitored and exceeded the limit. Thresholds: 380–440 VAC TM/VSD/LVSD – 745 VDC; 440–460 VAC TM/VSD/LVSD – 745 VDC; 575 VAC TM/VSD/LVSD – 909 VDC; all HYP – 985 VDC. | If this shutdown occurs, 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 exceeds 508 VAC, take steps to reduce the voltage to within the specified limits. | 216 | |
| VSD – Logic board power supply | All model drives. The low voltage power supplies for the logic boards have dropped below their allowable operating limits; they are derived from the secondary of the 120 VAC to 24 VAC transformer, which is derived from the 480 VAC to 120 VAC control power transformer. Usually means the power to the VSD has been removed. | 217 | ||
| VSD – Low DC Bus Voltage | All model drives. The DC bus voltage dropped below the limit; a common cause is a severe sag in the incoming power to the drive. Thresholds: 400 VAC TM/VSD/LVSD – 414 VDC; 460 VAC – 500 VDC; 575 VAC – 600 VDC; all HYP – 735 VDC. | The drive initiates a system shutdown. | 217 | |
| VSD – DC bus voltage imbalance | TM, VSD, and LVSD models. The 1/2 bus voltage is not within ±88 VDC for 400–460 VAC line or ±106 VDC for 575 VAC line of 1/2 of the total bus voltage. | 217 | ||
| VSD – DC bus pre-regulation | All model drives. The DC bus voltage has not increased to a value of ±50 V of the DC bus voltage setpoint within 2 s after entering the pre-regulation state; the setpoint depends on the rated input voltage of the VSD and the rated motor voltage (HYP thresholds: 380–415 in / 380–460 motor – 680; 460 / 380–460 – 750; 380–460 / 575 – 820). | After a delay of 10 s, the VSD attempts another pre-charge and pre-regulation cycle. If this shutdown occurs three consecutive times, the chiller locks out on a VSD – DC bus pre-regulation lockout. | 217 | |
| VSD – Precharge – DC bus voltage imbalance | All model drives. Same condition as the VSD DC bus voltage imbalance message, except the condition occurred during the pre-charge period. | 218 | ||
| VSD – High internal ambient temperature | All model drives. The drive ambient temperature, monitored by a sensor on the drive logic board, exceeded the high ambient trip threshold: 122°F (50°C) for TM, VSD, and LVSD models, or 158°F (70°C) for HYP model drives. | The fans and coolant pumps remain on until the internal ambient temperature has fallen to 115°F (46°C) for TM, VSD, and LVSD models, or 148°F (64°C) for HYP model drives. | 218 | |
| VSD – Invalid current scale selection | The part number of the VSD logic board is the same on all horsepower sizes; the position of the program jumpers tells the logic board the size of the VSD used so it can scale the output current. The jumper configuration is invalid. | A shutdown is performed. | 218 | |
| VSD – Invalid setpoints | HYP model drives. The VSD logic board determines which model of drive can run which model of motor; the control center provided a model of motor that is not compatible with this model of VSD. | When this condition clears, the chiller can be started after the Clear Faults key is pressed. | 218 | |
| VSD – Phase A, B, or C input DCCT offset | HYP model drives. Before the VSD enters the precharge state, the DCCT output is measured to verify it reads zero current correctly; the output of the DCCT is above a threshold determined by the drive logic board. The test is performed on all three input/rectifier DCCTs at the same time. | If this cycling shutdown occurs three times in a row on the same phase, a VSD – Phase A, B, or C input DCCT offset safety shutdown occurs. | 218 | |
| VSD – Line voltage phase rotation | HYP model drives. Internally to the drive the rotation must remain the same; the output of the line voltage isolation board cannot show CBA rotation when the input voltage is really ABC rotation. Two methods in the VSD logic board determine the line voltage phase rotation; they do not report the same phase rotation. | 219 | ||
| VSD – Low phase A, B, C inverter heatsink temperature | TM model drives. A heatsink temperature sensor indicates a temperature less than 37°F (2.8°C); in most cases the issue is an open thermistor or broken wiring to the thermistor. | The chiller shuts down. | 219 | |
| VSD – Low converter heatsink temperature | TM, VSD, and LVSD model drives. A thermistor sensor located on the SCR/diode block side of the copper chill plate on the drive power unit detects a temperature of 37°F (2.8°C) or lower. | A shutdown occurs. | 219 | |
| VSD – Low phase A, B, C input baseplate temperature | HYP model drives. The input/rectifier modules temperature drops below 37°F (2.8°C). | This shutdown cannot be reset until the temperature of all modules exceeds 42°F (5.6°C). The fans and pumps for the VSD continue to run until the temperature exceeds the reset level. | 219 | |
| VSD – Low inverter baseplate temperature | Single pole VSD and LVSD model drives. A thermistor sensor located inside the transistor modules on the drive power unit detects a temperature of 37°F (2.8°C) or lower. | A shutdown occurs. | 219 | |
| VSD – Low phase A, B, or C inverter baseplate temperature | 3-pole VSD and LVSD model drives. A thermistor sensor located inside the transistor modules on the drive power unit detects a temperature of 37°F (2.8°C) or lower. | A shutdown occurs. | 219 | |
| VSD – Low phase A, B, or C motor baseplate temperature | HYP model drives. The motor or inverter modules temperature drops below 37°F (2.8°C). | This shutdown cannot be reset until the temperature of all modules exceeds 42°F (5.6°C). The fans and pumps for the VSD continue to run until the temperature exceeds the reset level. | 220 | |
| VSD – Phase locked loop | HYP model drives. The drive automatically determines the input voltage frequency via the line voltage isolation board; the drive logic board cannot determine that the input voltage frequency is 50 Hz or 60 Hz. | 220 | ||
| VSD – Precharge – Low DC bus voltage 1 | All model drives. During precharge, the DC bus voltage must reach at least the low threshold determined by the line voltage setpoint within 4 s after the precharge signal is commanded; it did not. Thresholds: 380–415 VAC – 41 VDC; 460 VAC – 50 VDC; 575 VAC – 60 VDC. | The VSD logic board waits 10 s before clearing the fault and allowing another precharge to start; fans and water pumps remain energized. Up to three consecutive precharge-related faults are allowed; after the third, the safety shutdown message VSD – Precharge lockout is generated. | 220 | |
| VSD - Precharge - Low DC bus voltage 2 | All model drives. Near the end of precharge, the DC link voltage must reach at least the high threshold determined by the line voltage setpoint within 20 s after the precharge signal is commanded; it did not. Thresholds: 380–415 VAC – 414 VDC; 460 VAC – 500 VDC; 575 VAC – 600 VDC. | The VSD logic board waits 10 s before clearing the fault and allowing another precharge to start; fans and water pumps remain energized. Up to three consecutive precharge-related faults are allowed; after the third, the safety shutdown message VSD – Precharge lockout is generated. | 220 | |
| VSD – Logic board processor | All model drives. A communication problem occurs between the two microprocessors on the drive logic board. | 221 | ||
| VSD – Not running | All model drives. OptiView-generated: the VSD logic board communicates that it has received the run command but is not reporting that it is running for 8 s consecutively. | 221 | ||
| VSD – Run signal | All model drives. Redundant run signals are generated by the OptiView control center — one through TB6-24 and one through the serial communications link. When the VSD receives either run command a 5 s timer starts; the VSD logic board does not receive both run commands within 5 s. | A shutdown is performed by the VSD. | 221 | |
| VSD – Serial receive | Generated by the VSD logic board when communications between the microboard and the drive logic board are disrupted for at least 10 s. With the optional harmonic filter installed, the fault can also be generated when communications between the drive logic board and the harmonic filter logic board are disrupted. | 221 | ||
| Harmonic filter – High DC bus voltage | TM and VSD model drives. The harmonic filter logic board continuously monitors the filter DC link voltage (the filter has its own DC bus, not connected to the drive DC Link); the level exceeded the range: 400–460 VAC – 822 to 900 VDC; 575 VAC – 999 to 1,099 VDC. | This shutdown is initiated. | 221 | |
| Harmonic filter – High phase A, B, or C current | TM and VSD model drives. The maximum instantaneous harmonic filter current, monitored using two DCCTs and processed by the filter logic board, exceeded the preset limit: 292/351/424 hp – 378 ±59 A; 385/419/503/608 hp – 523 ±84 A; 658/704/790 hp – 782 ±118 A; 914/1,055 hp – 1,225 ±176 A; 1,100/1,300 hp – 1,700 ±154 A. | If the VSD automatically restarts and continues to operate correctly with the filter operating, the filter likely tripped due to a sag or surge in the voltage feeding the VSD. If this message reoccurs and prevents the chiller from starting, the VSD requires service. | 222 | |
| Harmonic filter – Phase locked loop | TM and VSD model drives. The phase locked loop circuit on the filter logic board has lost synchronization with the incoming power line; usually indicates an open fuse in one of the filter’s incoming power lines. | 222 | ||
| Harmonic filter – Precharge – Low DC bus voltage 1 | During filter precharge, the filter DC bus voltage must reach at least the high threshold determined by the line voltage setpoint within 0.1 s after the precharge signal is commanded; it did not. Thresholds: 400–460 VAC – 41 VDC; 575 VAC – 60 VDC. | This shutdown is generated by the harmonic filter logic board. | 222 | |
| Harmonic filter – Precharge – Low DC bus voltage 2 | Near the end of filter precharge, the filter DC bus voltage must reach at least the high threshold determined by the line voltage setpoint within 5 s after the precharge signal is commanded; it did not. Thresholds: 400–460 VAC – 425 VDC; 575 VAC – 630 VDC. | This shutdown is generated by the harmonic filter logic board. | 223 | |
| Harmonic filter – Low DC bus voltage | TM and VSD model drives. The filter generates its own boosted DC bus voltage (higher than obtainable by rectifying the input line) to permit current to flow into the power line at the input peak; the filter’s DC bus voltage decreased to a level less than 80 VDC (400–460 VAC line) or 100 VDC (575 VAC line) below the filter DC link voltage setpoint, which is set to the peak of the sensed input line-to-line voltage. | 223 | ||
| Harmonic filter – DC bus voltage imbalance | TM and VSD model drives. The DC bus uses series-connected capacitor sets that must share approximately half the total DC bus voltage each; while the filter is running, the difference in voltage between the two sets of capacitors is greater than 50 VDC (400–460 VAC line) or 65 VDC (575 VAC line). | A shutdown occurs. | 223 | |
| Harmonic filter – Input current overload | TM and VSD model drives. One of the three phases of RMS filter current continuously exceeds the given threshold for 40 s. Maximum continuous RMS ratings: 351/292 hp – 128 A; 503/419 hp – 176 A; 790/658 hp – 277 A; 1,055/914 hp – 385 A; 1,100/1,300 hp – 506 A. | A chiller shutdown is performed. | 223 | |
| Harmonic filter – Logic board power supply | TM and VSD model drives. The low voltage power supplies on the filter logic board have decreased below their permissible operating range; the filter logic board receives its power from the VSD logic board through the ribbon cable connecting the two boards. | 224 | ||
| Harmonic filter – Run signal | TM and VSD model drives. When a digital run command is received at the filter logic board from the VSD logic board through the 16-position ribbon cable, a 1/10 s timer starts; a redundant run command does not occur on the serial data link from the VSD logic board before the timer expires. | A shutdown is performed. | 224 | |
| Harmonic filter – DC current transformer 1 or 2 | TM and VSD model drives. During initialization, with no current flowing through the DCCTs, the DCCT output voltages are measured and compared with preset limits from the filter logic board; the measured values exceed the preset limits, so the DCCTs are presumed defective. | This shutdown is generated. | 224 |
Safety fault messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Auxiliary safety – Contacts closed | The auxiliary safety shutdown contacts, connected to I/O board TB4-31, have closed, initiating a safety shutdown. General-purpose, user-defined safety shutdown input. | The chiller can be started after the contacts open and the Clear button is pressed next to the listed event on the Systems Details Screen. | 225 | |
| Evaporator - Low pressure - Smart Freeze | Occurs when the Evaporator - Low pressure - Smart Freeze cycling fault has been set three times in 90 min. | The chiller can be restarted after the evaporator pressure has increased above the override threshold and the Clear button is pressed next to the listed event on the Systems Details Screen. | 226 | |
| Evaporator – Transducer or leaving liquid probe | Possible defective evaporator pressure transducer or LCHLT thermistor: the converted evaporator saturated temperature differs from the LCHLT by more than +25.0°F colder or 2.5°F warmer (acceptable range -2.5°F to +25.0°F) continuously for 10 min. Bypassed if the head pressure is less than 5 psid. | The chiller can be started after the Clear Fault key is pressed on the display. | 226 | |
| Evaporator – Transducer or temperature sensor | Possible defective evaporator pressure transducer or refrigerant temperature sensor: the difference between the converted evaporator saturation temperature and the optional evaporator refrigerant temperature sensor is greater than 3.0°F continuously for 1 min. Checked when: chiller running at least 10 min; evaporator refrigerant temperature (RT7) enabled; not in brine cooling mode; Smart Freeze enabled; RT7 or evaporator saturation temperature below 32.0°F (0°C). | The chiller can be started after the temperatures are within 3.0°F of one another and the Clear button is pressed next to the listed event on the Systems Details Screen. | 227 | |
| Compressor – Low discharge superheat | The discharge superheat has decreased to less than 1.0°F (0.5°C) for 5 min after the chiller has been running for 30 min, for all compressor and evaporator combinations. | This fault clears when the chiller is not running, and the Clear button is pressed next to the listed event on the Systems Details Screen. | 227 | |
| Control panel – Loss of control voltage | When the power failure reset is manual, this is a safety fault: the line power input signal at I/O board TB3-30 was low for 1 s continuously. This signal determines when digital inputs are affected by a line power loss rather than an actual device condition. | 227 | ||
| Control panel – Power failure | When the power failure restart is set to manual, this is a safety fault: a control power failure has occurred. | If the power failure duration was less than the applicable coastdown period when power is restored, the remainder of the coastdown is performed after power is restored. The chiller can be restarted after the Clear button is pressed next to the listed event on the Systems Details Screen. | 227 | |
| Condenser – High pressure contacts open | The contacts of the electromechanical high pressure safety switch have opened, causing the input to I/O board TB3-32 to cease while the control voltage signal at I/O board TB3-30 is high. | The chiller can be started after the contacts close and the Clear button is pressed next to the listed event on the Systems Details Screen. | 227 | |
| Condenser – High pressure | The condenser pressure, as sensed by the condenser transducer, has increased to more than 180.0 psig. Extended condenser temperature applications: trip/reset 200.0 psig/140 psig. High temperature heat pump applications: trip/reset 364.0 psig/340.0 psig. | The chiller can be started after the pressure decreases to less than 120.0 psig (extended range: 140 psig; high temperature heat pump: 340.0 psig) and the Clear button is pressed next to the listed event on the Systems Details Screen. | 228 | |
| Condenser – High pressure – Stopped | The condenser pressure exceeded 160.0 psig while the chiller was stopped. High temperature condenser water flowing through the condenser while shutdown can cause a high pressure condition resulting in loss of refrigerant; this fault anticipates that problem. Extended condenser temperature applications: trip/reset 170/170 psig. High temperature heat pump applications: trip/reset 358.0 psig/358.0 psig. | The chiller can be restarted after a service technician performs a special reset procedure. | 228 | |
| Condenser – Pressure transducer out of range | The condenser pressure transducer indicates a pressure less than 0.0 psig or more than 300.0 psig — outside the normal operating range; generally indicates a defective transducer. | The chiller can be started after the transducer indicates a pressure within range and the Clear button is pressed next to the listed event on the Systems Details Screen. | 228 | |
| Discharge – High temperature | The discharge temperature, as sensed by the discharge temperature thermistor, has increased to greater than 220.0°F (104.4°C). | The chiller can be started after the temperature decreases to less than 219.0°F (103.9°C) and the Clear button is pressed next to the listed event on the Systems Details Screen. | 228 | |
| Discharge - Low temperature | The discharge temperature, as sensed by the discharge temperature thermistor, has decreased to less than or equal to 30.0°F (-1.1°C). | The chiller can be started after the temperature increases to greater than 31.0°F (-0.6°C) and the Clear button is pressed next to the listed event on the Systems Details Screen. | 228 | |
| Internal error – No timer handles available | Set in the unlikely event that the operating system reports an error in providing a requested timer handle. | This message clears when the power to the panel is turned off and then back on. | 228 | |
| Isolation valves – Not opened | Isolation valves enabled on the setup screen; the isolation open output relay on LTC I/O TB17 has been energized for more than 40 s and the isolation valve opened digital input on LTC I/O board TB19-3,4 is low. | The fault is released when the chiller is not running and the Clear button is pressed next to the listed event on the Systems Details Screen. | 229 | |
| Oil - High viscosity | Only applies when oil quality protection and oil cooling control are enabled. After 30 min of running, the oil kinematic viscosity has been greater than the JCI Service programmable high viscosity trip threshold (default 30.0 cSt) for 5 min. | The fault can be cleared after the chiller has stopped and the Clear button is pressed next to the listed event on the Systems Details Screen. | 229 | |
| Oil - Low viscosity | Only applies when oil quality protection and oil cooling control are enabled. Either: after 10 min of running, the oil kinematic viscosity has been less than the JCI Service programmable low viscosity long trip threshold (default 8.0 cSt) for 5 min; or after 1 min of running, the viscosity has been less than the short trip threshold (default 6.0 cSt) for 10 s. | The fault can be cleared after the chiller has stopped and the Clear button is pressed next to the listed event on the Systems Details Screen. | 229 | |
| Oil - High dilution | Only applies when oil quality protection is enabled. After 10 min of running, the oil dilution is greater than the JCI Service programmable high dilution safety trip threshold (default 15.0%). | The fault can be cleared when the chiller has stopped and the Clear button is pressed next to the listed event on the Systems Details Screen. | 229 | |
| Oil - High sump temperature | The oil temperature, as sensed by the oil temperature thermistor, has increased to greater than 180.0°F (82.2°C). | The chiller can be started after the temperature decreases to less than or equal to 180.0°F (82.2°C) and the Clear button is pressed next to the listed event on the Systems Details Screen. | 229 | |
| Oil – High sump pressure | Heat pump mode enabled. Displayed when the chiller has been running less than 10 min and the oil sump pressure is greater than 140.0 psig for 10 s; also when running 10 min and the oil sump pressure is greater than 110.0 psig for 10 s, or instantly if the oil sump pressure is greater than 220 psig at any time. | The fault clears when the chiller is in a stopped state and the Clear button is pressed next to the listed event on the Systems Details Screen. | 230 | |
| Oil – High supply temperature | Oil cooling control enabled; after 5 min of running, the oil supply temperature, as sensed by the oil supply temperature thermistor, has increased 15°F (8.3°C) above the service-programmable oil supply temperature setpoint (default 120°F [48.9°C]) for 1 min. | The chiller can be started after the temperature decreases below the trip threshold and the Clear button is pressed next to the listed event on the Systems Details Screen. | 230 | |
| Oil – Low supply temperature | Oil cooling control enabled; after 5 min of running, the oil supply temperature, as sensed by the oil supply temperature thermistor, has decreased 15°F below the oil supply temperature setpoint for 1 min. | The chiller can be started after the temperature rises above the trip threshold or the chiller is in a stopped state, and the Clear button is pressed next to the listed event on the Systems Details Screen. | 230 | |
| Oil – Low differential pressure | The differential oil pressure (sump oil pressure transducer output minus pump oil pressure transducer output) decreased to less than 15.0 psid while running, or failed to achieve 25.0 psid by the last 5 s of the system prelube period. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details Screen while in a stopped state. | 230 | |
| Oil – High differential pressure | The differential oil pressure (sump oil pressure transducer output minus pump oil pressure transducer output) increased to greater than 120.0 psid while the oil pump was running. | The chiller can be started after the differential oil pressure decreases to less than 120.0 psid and the Clear button is pressed next to the listed event on the Systems Details Screen. | 230 | |
| Oil – Pump pressure transducer out of range | The pump oil pressure transducer (system high pressure) indicates a pressure less than 0.0 psig or greater than 300 psig — outside the normal operating range; generally indicates a defective transducer. | The chiller can be started after the transducer indicates a pressure within range and the Clear button is pressed next to the listed event on the Systems Details Screen. | 231 | |
| Oil – Sump pressure transducer out of range | The sump oil pressure transducer (system low pressure) indicates a pressure outside the normal operating range — less than 0.0 psig or more than 300 psig; generally indicates a defective transducer. | The chiller can be started after the transducer indicates a pressure within range and the Clear button is pressed next to the listed event on the Systems Details Screen. | 231 | |
| Oil – Differential pressure calibration | The sump and pump oil pressure transducers indicated a differential oil pressure of greater than 15.0 psid during the auto-zeroing period that begins 10 s into system prelube and lasts 3 s. Indicates a defective sump or pump transducer, since the oil pump is not running during this period and the actual differential is 0 psid. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details Screen. | 231 | |
| Oil – Variable speed pump – Setpoint not achieved | Occurred while in system prelube, system run, or system coastdown: the differential oil pressure is less than 35.0 psid for 5 s continuously during the last 10 s of the system prelube period or during the first 15 s of system run; or anytime after the first 30 s of system run, the differential oil pressure is less than the active oil pressure setpoint minus 5.0 psid with the speed command from the microboard at 60 Hz for 5 s continuously. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details Screen. | 231 | |
| Oil – Variable speed pump - High rate of change | After the chiller has been running for 90 s, the current oil pump frequency compared with previous frequencies in a set period of time (oil pump frequency difference) is greater than 1.5 Hz (default). Bypassed for 60 s if the oil pressure setpoint is changed during operation. | This safety fault immediately shuts down the chiller. The message is released when the Clear button is pressed next to the listed event on the Systems Details Screen. | 231 | |
| Motor or starter – Current imbalance | The 3-phase compressor motor current imbalance was greater than 30% continuously for 45 s. Not checked until the chiller has been running at least 45 s and the average of the three phases of motor current is greater than 80% of the programmed 100% chiller FLA. The LVSSS and VSD detect the condition and advise the OptiView microboard through serial communications. Not performed on electromechanical starter applications. | The fault is released when the chiller is in a stopped state and the Clear button is pressed next to the listed event on the Systems Details Screen. | 232 | |
| Motor – Current >15% FLA | Instantly set when the chiller is not running and a motor current of greater than 15% FLA is detected. | The oil pump is started as soon as this fault is detected (variable speed oil pump starting frequency 45.0 Hz). The start inhibit is released when the motor current decreases to less than 15%; a full system coastdown is performed when this fault is released. | 232 | |
| Motor – Lack of bearing lubrication | Auto lube type is none and the operating hours since last motor lubrication has exceeded the setpoint hours plus 200. Replaces Warning - Motor beaing lube required. | This safety shutdown remains in effect until the operator presses the Clear button next to the listed event on the Systems Details Screen and enters their initials, name, or user ID using the Motor Lube Acknowledge key on the motor lubrication screen; the date/time is logged and the operating hours since last lubrication reset to zero. | 232 | |
| Motor – Lack of bearing oil change | Auto lube type is sleeve and the operating hours since last motor lubrication is greater than or equal to 6,000 hours. Replaces Warning - Motor – Oil change required. | This safety shutdown remains in effect until the operator presses the Clear button next to the listed event on the Systems Details Screen and enters their initials, name, or user ID using the Motor Lube Acknowledge key on the motor lubrication screen; the date/time is logged and the operating hours since last lubrication reset to zero. | 233 | |
| Motor – High winding temperature | Either any of the enabled motor winding temperatures exceeded the programmed high winding temperature shutdown threshold plus the programmed winding hotspot allowance threshold for 3 s continuously, or the average winding temperature exceeded the programmed high winding temperature shutdown threshold for 3 s continuously. Does not occur when winding temperature protection is set to Disabled; does not act on open RTDs or disabled sensors. | The chiller can be started after all winding temperatures decrease to at least 18°F (10°C) below the shutdown threshold and the Clear button is pressed next to the listed event on the Systems Details Screen. | 233 | |
| Motor – High bearing temperature | Either of the enabled motor bearing temperatures exceeds the programmed high bearing temperature shutdown threshold for 3 s continuously. Does not occur when bearing temperature protection is set to disabled; does not act on open RTDs. | The chiller can be started after both bearing temperatures decrease to at least 9°F below the shutdown threshold and the Clear button is pressed next to the listed event on the Systems Details Screen. | 233 | |
| Motor – High bearing vibration | Either the shaft end or opposite shaft end motor bearing vibration has exceeded the value programmed for the high vibration shutdown setpoint for the programmed number of delay seconds. Does not occur when motor vibration protection is set to disabled or while the Warning – Motor – Bearing vibration baseline set warning is displayed. | The chiller can be started after both vibration values decrease below the shutdown threshold and the Clear button is pressed next to the listed event on the Systems Details Screen. | 233 | |
| Motor - Cooling coil leak | The motor cooling coil leak detector has registered a fault condition for at least 3 s continuously. With an optical sensor the input to the motor monitoring board goes high to indicate a leak; with a float switch the input goes low. Does not occur when the motor cooling coil leak protection setpoint is set to disabled. | The chiller can be started after the leak sensor no longer indicates a leak and the Clear button is pressed next to the listed event on the Systems Details Screen. | 234 | |
| Motor controller – Fault contacts open | MVVSD applications: the motor controller fault contacts connected to TB6-16 and TB6-53 in the OptiView Control Panel have opened three times in 15 min. | The chiller automatically restarts if it was running when the fault occurred. | 234 | |
| Safety stop | The panel safety stop hardware push button was pressed, removing input from the I/O board terminal TB3-28 for >500 ms continuous; also sets the local command to stop. | The chiller can be started when the push button is released, and the Clear button is pressed next to the listed event on the Systems Details Screen. | 234 | |
| Sales order – Invalid compressor model | The compressor code in positions 7 and 8 of the model number on the Sales Order Screen is invalid. | The fault clears when a valid code is entered, and the Clear button is pressed next to the listed event on the Systems Details Screen. | 234 | |
| Sales order – Invalid gear code | The gear code entered on the Sales Order Screen does not match the particular compressor code from the model number. | The fault clears when the gear code and compressor code are a valid combination, and the Clear button is pressed next to the listed event on the Systems Details Screen. | 234 | |
| Surge protection – Excess surge | Applies only if the surge protection shutdown feature is enabled and any of: hot gas disabled (SSS/EM), hot gas enabled with HGBP valve command 100% (SSS/EM), hot gas disabled with VSD at maximum frequency, hot gas enabled with HGBP 100% and VSD at maximum frequency. The surge window count exceeded the count limit setpoint. | If the extended run feature is disabled, the chiller shuts down as soon as the count exceeds the limit; if enabled, the shutdown occurs only if the count exceeds the limit at completion of the 10 min extended run period. The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details Screen. | 235 | |
| Thrust bearing – Proximity probe uncalibrated | The high speed thrust bearing proximity reference position has not been calibrated. Only applies to compressors that use proximity thrust bearing protection. | This fault can only be released when the compressor switch is placed in the stop position and the high speed thrust bearing proximity reference position is successfully calibrated. For MVVSD applications, a password is required to acknowledge the fault on the Proximity Probe Calibration Screen before the Clear button is pressed next to the listed event on the Systems Details Screen. | 235 | |
| Thrust bearing – Proximity probe clearance | The clearance between the compressor high speed thrust collar and the tip of the proximity probe has increased more than 10 ml or decreased to less than -25 ml for 0.2 s from the reference position (minimum allowed clearance 23 ml). Checked only during the last 20 s of system prelube, during system run and during coastdown. Only applies to compressors that use proximity thrust bearing protection. | The fault is released when the proximity position is less than +10 ml or greater than -25 ml from the reference position, or the proximity position is greater than 22 ml. The message is released when the compressor switch is placed in the stop position and the Clear button is pressed next to the listed event on the Systems Details Screen; a password is required to acknowledge the fault on the Proximity Probe Calibration Screen first. CAUTION: a qualified service technician must evaluate this shutdown before starting; restart is inhibited until the clearance is within acceptable limits and a special reset procedure is performed by the service technician. | 235 | |
| Thrust bearing – Proximity probe out of range | The clearance between the compressor high speed thrust collar and the tip of the proximity probe has decreased to less than 18 ml. Checked/detected only during the last 20 s of system prelube, during system run and during coastdown. Only applies to compressors that use proximity thrust bearing protection. | The fault is released when the proximity position is at least 18 ml. The message is released when the compressor switch is placed in the stop position and the Clear button is pressed next to the listed event on the Systems Details Screen; a special password is required to acknowledge the fault on the Proximity Probe Calibration Screen first. CAUTION: a qualified service technician must evaluate this shutdown before starting; restart is inhibited until the clearance is within +10 ml to -25 ml of the reference position and a special reset procedure is performed by the service technician. | 236 | |
| Thrust bearing – Limit switch open | The high speed thrust bearing limit switch contacts, connected to TB3-81, have opened — the bearing position has decreased to less than the allowed position. Only applies to compressors that use a sacrificial limit switch for thrust bearing protection. | The message is released when the chiller is in a stopped state and the Clear button is pressed next to the listed event on the Systems Details Screen; a special password is required to acknowledge the fault on the Proximity Probe Calibration Screen first. CAUTION: a qualified service technician must evaluate this shutdown before starting; restart is inhibited until the switch contacts have closed and a special reset procedure is performed by the service technician. | 236 | |
| 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; generally indicates a severe electrical power disturbance or impending microboard failure. | The result is a safety shutdown and re-initialization of the program. The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details Screen. | 237 |
Liquid cooled solid states starter safety fault messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| LCSSS – 105% motor current overload | The highest phase of the compressor motor current increased to greater than 105% of the programmed 100% chiller FLA continuously for 40 s. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 238 | |
| LCSSS – High instantaneous current | The LCSSS logic/trigger board detected that the compressor motor current in any phase exceeded 1.15 (1.414 x RMS value of the programmed start current) for a minimum of 1 s. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 238 | |
| LCSSS – High phase A, B, or C heatsink temperature | The LCSSS logic/trigger board detected that the temperature of the phase A, B, or C SCR modules has exceeded 212°F (100°C) while the chiller was running. | The safety can be reset after all SCR temperatures are less than 210°F (98.9°C) and the Clear button is pressed next to the listed event on the Systems Details screen; however, the chiller cannot be started until all SCR temperatures are less than 109°F (42.8°C). During the shutdown, the starter cooling pump runs until the temperature is less than 109°F (42.8°C). | 238 | |
| LCSSS – Motor or starter – Current imbalance | Set by the LCSSS trigger/logic board; the calculation is the same as the OptiView uses. | 238 | ||
| LCSSS – Phase A, B, or C shorted SCR | A shorted SCR in phase A, B, or C has been detected by the LCSS logic/trigger board; the voltage across each SCR is monitored. The shorted condition must exist continuously for 5 s to annunciate the fault. This check is disabled while the chiller is running. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 238 | |
| LCSSS – Open SCR | An open SCR in phase A, B, or C has been detected by the LCSSS logic/trigger board; the open condition must exist continuously for 5 s to annunciate the fault. This check is disabled when the chiller is shut down. In certain applications, local power line conditions could interfere with the open SCR detection technique. | The chiller can be started after the condition has been corrected and the chiller is in a stopped state. Interference from local power line conditions requires a qualified service technician to disable this check. | 239 | |
| LCSSS – Phase rotation | The LCSSS logic/trigger board has detected the three phase compressor motor power line voltage phase rotation is not correct. | The chiller can be started after the phase rotation is correct and the Clear button is pressed next to the listed event on the Systems Details screen. | 239 |
Medium voltage solid state starter safety fault messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| MVSSS - Failed SCR | The starter has detected an open or shorted SCR. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 240 | |
| MVSSS – High instantaneous current | The starter controller board detected that the motor current in any phase exceeded the maximum rated amps for a minimum of 1 s. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 240 | |
| MVSSS – 105% motor current overload | The highest phase of the compressor motor current increased to greater than 105% of the programmed 100% chiller FLA continuously for 40 s. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 240 | |
| MVSSS – Motor or starter current imbalance | A current imbalance greater than 30% difference between phases has been detected for 45 s consecutively by the starter controller board. Bypassed for the first 45 s of runtime, and when motor current is below 80% FLA. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 241 | |
| MVSSS – Disconnect fault | The disconnect feedback indicates the switch has opened while running. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 241 | |
| MVSSS – Control board fault | The control board in the medium voltage solid state starter has detected a hardware or software problem. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 241 | |
| MVSSS – Ground fault | The ground fault current as detected by the starter has exceeded 50% FLA for 3 s. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 241 | |
| MVSSS – Contactor fault | The auxiliary hardwired contacts do not match the contactor status. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 241 | |
| MVSSS – Phase rotation | The starter controller board has sensed the three phase power line voltage phase rotation is not correct. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 241 | |
| MVSSS – High Heatsink 1, 2, or 3 temperature | The temperature sensed on the stated phase stack has exceeded 194°F (90°C) while running. | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 241 |
Medium voltage variable speed drive safety fault messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| VSD - High instantaneous current | Becomes a safety fault when the cycling fault has occurred three times in 90 min. See Cycling faults. | The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 242 | |
| VSD - High phase A, B, or C inverter baseplate temperature | The stated phase heatsink temperature exceeds 175°F (79.4°C). | The drive releases the fault when all the heatsink temperatures fall below 145°F (62.8°C). The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 242 | |
| VSD - Main control board fault | The drive controller board has detected a hardware or software problem. | The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 242 | |
| VSD - Power transformer high temperature | Any one of the three input power transformer temperature sensors exceeds 392°F (200°C) (Hammond transformer) or 374°F (190°C) (Hitran transformer). | The drive releases the fault when the temperatures drop below the trip values. The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 243 | |
| VSD - High output frequency | The drive detects the output voltage frequency has exceeded 65 Hz for 60 Hz units or 55 Hz for 50 Hz units. | The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 243 | |
| MVVSD - Interlock fault | The drive has detected that one of the cabinet door interlocks or microswitches is open, indicating a door is not closed or secured. | The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 243 | |
| MVVSD - Ground fault | During startup and while running, the drive monitors the peak value of the current conducted through the neutral connection of the three inverter power assemblies and the earth (ground) lug; the ground current continuously exceeds 6 mA for 200 ms. | The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 243 | |
| VSD - 105% Motor overload current | The average of the three phase currents exceeds 1.05 times the 100% job FLA limit. | The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 243 | |
| MVVSD - Contactor fault | The auxiliary contact for the input contactor is not in the correct state (precharge contactor open fault), or the auxiliary contact for the input disconnect switch is in an incorrect state (input contactor open fault). | The chiller can be started after the fault is cleared on the starter, and the Clear button is pressed next to the listed event on the Systems Details screen. | 243 |
Variable speed compressor drive safety fault messages
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| VSD – 105% motor current overload | All model drives. Generated by the VSD logic board when at least one of the three output phase currents has exceeded 105% of the chiller FLA value for greater than 7 s for TM model drives, and 40 s for VSD, LVSD, and HYP model drives. The chiller FLA value is set by the FLA potentiometer on the VSD logic board. | In a stopped state, the chiller can be started after the Reset push-button on the VSD logic board is pressed and the Clear button is pressed next to the listed event on the Systems Details screen. | 244 | |
| VSD - DC bus lockout - Do not cycle power | HYP model drives. 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 of 100 VDC every 5 min; the DC bus voltage is higher than the threshold value. | When the condition clears and the VSD rectifier modules are tested, the chiller can be started. If power is removed and reapplied without correcting this problem, more damage occurs to the drive and the repair is more costly. | 245 | |
| VSD – DC bus pre-regulation lockout | HYP model drives. The unit fails to complete pre-regulation due to the VSD – DC bus pre-regulation fault; up to three consecutive pre-regulation related faults are allowed, and this shutdown is generated after the third consecutive fault. | The VSD waits 10 s before clearing the fault and allowing another precharge to start; unit fans and water pumps remain energized during the wait time. | 245 | |
| VSD – Frequency > 0 Hz | Set when the chiller is shutdown and a compressor motor VSD output frequency greater than 0 Hz is detected. | The oil pump is started (starting frequency 45 Hz) as soon as this fault is detected. The fault is released and the chiller can be started after the operator presses the Clear button next to the listed event on the Systems Details screen; a system coastdown is performed whenever this fault is released. | 245 | |
| VSD – Ground fault | HYP model drives. The sum of the three phases of instantaneous input current values is greater than 200 A for a period of 1 s. | 245 | ||
| VSD – High phase A, B, or C inverter heatsink temperature | TM model drives. The heatsink temperature exceeds 158°F (70°C) on any of the output pole assemblies. | Ensure the coolant level is adequate, verify the pump is operating when the chiller is running, and check the strainer in the primary of the heat exchanger for clogs and silt. The fans and water pump remain energized until all inverter heatsink temperatures fall below 155°F (68.3°C). The chiller can be started after the fault condition clears and the Clear button is pressed next to the listed event on the Systems Details screen. | 246 | |
| VSD – High converter heatsink temperature | TM, VSD, and LVSD model drives. The heatsink temperature exceeds 170°F (76.7°C), or 150°F (65.6°C) for VSD 1300/1100 hp. | The fans and water pump remain energized until all converter heatsink temperatures fall below 160°F (71.1°C), or 140°F (60.0°C) for VSD 1300/1100 hp. The chiller can be started after the fault condition clears and the Clear button is pressed next to the listed event on the Systems Details screen. | 246 | |
| VSD – High input current TDD | HYP model drives. The 3-phase input current TDD is monitored while the chiller is running; the highest phase of TDD is greater than or equal to 25% for 40 s continuously. | The chiller can be started when the Clear button is pressed next to the listed event on the Systems Details screen. | 246 | |
| VSD – High phase A, B, or C input baseplate temperature | HYP model drives. The input/rectifier IGBT module temperatures are continuously monitored by the gate driver board; the highest temperature per phase is compared against a threshold by the VSD logic board and an IGBT module exceeds it. Shutdown threshold: 1100 model – 170°F (76.6°C); 1300 model – 150°F (65.5°C). | The cooling fans and pumps for the VSD continue to run for 2 min after the fault occurred. The chiller can be started after the fault condition clears and the Clear button is pressed next to the listed event on the Systems Details screen. | 247 | |
| VSD – High phase A, B, or C input current | HYP model drives. Three high input current cycling shutdown faults have occurred on any phase within 90 min; the third fault in the 90 min period causes a safety shutdown. See Cycling faults. | The chiller can be started after the fault condition clears, and the Clear button is pressed next to the listed event on the Systems Details screen. | 247 | |
| VSD – High total demand distortion | HYP model drives. OptiView-generated shutdown when the highest phase of TDD is greater than or equal to 25%. | The chiller can be started when the highest phase TDD is less than 25%, and the Clear button is pressed next to the listed event on the Systems Details screen. | 248 | |
| VSD – High phase A, B, or C instantaneous current | TM, VSD, and LVSD model drives. Becomes a safety fault when the cycling fault has occurred three times in 90 min. See Cycling faults. | The chiller can be started after the fault condition clears, and the Clear button is pressed next to the listed event on the Systems Details screen. | 248 | |
| VSD – High phase A, B, or C motor current | HYP model drives. Three high motor current cycling shutdown faults have occurred on any phase within 90 min; the third fault in the 90 min period causes a safety shutdown. See Cycling faults. | The chiller can be started after the fault condition clears, and the Clear button is pressed next to the listed event on the Systems Details screen. | 248 | |
| VSD – Inverter program fault | HYP model drives. The drive is used on two different motor designs; the inverter software must be verified as correct for the motor design used. Three pieces of data must state that the correct inverter software is installed in the VSD logic board to prevent this shutdown. | 248 | ||
| VSD – Input DCCT offset lockout | HYP model drives. The drive contains three DCCTs to measure the input current; the Input DCCT offset cycling shutdown has occurred three times in a row on the same phase. | This safety shutdown is generated to require investigation and manual reset. See the Input DCCT Offset cycling shutdown for more details. | 248 | |
| VSD – Input current overload | HYP model drives. The input current overload value is 1.16 times the input job FLA value (not to exceed 1,305 A), accounting for installations where the input line voltage could be up to 10% below nominal, plus an additional 5% to reduce nuisance shutdowns; the value must be exceeded for 10 s continuously for this shutdown to occur. | To unload, the chiller can be started after the fault condition clears, and the Clear button is pressed next to the listed event on the Systems Details screen. | 249 | |
| VSD – Logic board plug | HYP model drives. A jumper is connected across the connector where the input and output currents connect to the drive logic board so the board can prove the connector is installed; the proof failed. | The chiller can be started after the fault condition clears, and the Clear button is pressed next to the listed event on the Systems Details screen. | 249 | |
| VSD – Logic board hardware | HYP model drives. After power is applied, the VSD logic board performs several internal tests to ensure correct operation of the input power device; the tests fail. | 249 | ||
| VSD – Low frequency detected | All model drives. After a 20 s bypass after entering system run, the VSD frequency decreases 1 Hz less than the minimum allowed frequency (25 Hz for 50 Hz units, 30 Hz for 60 Hz units) for 25 s continuously. | The message is released when the chiller is in a stopped state and the Clear button is pressed next to the listed event on the Systems Details screen. | 249 | |
| VSD - Motor current imbalance | All model drives. Generated by the drive logic board; becomes active when the highest of the three motor currents exceeds 80% of the programmed FLA and any one phase of motor current exceeds 30% of the average current for 45 s. | The chiller can be started after the fault condition clears, and the Clear button is pressed next to the listed event on the Systems Details screen. | 250 | |
| VSD – Motor current THD fault | HYP model drives. Protects the compressor motor from overheating due to current harmonics produced by the VSD; output voltage isolation board data determines the output frequency and output DCCT data determines the current harmonics presented to the motor, which are above the preset value determined by the drive logic board. | The chiller can be started after the fault condition clears, and the Clear button is pressed next to the listed event on the Systems Details screen. | 250 | |
| VSD – Phase A, B, or C motor DCCT | HYP model drives. Determines if the cable at the motor DCCT is connected; generated 1.5 s after the motor is commanded to run if the motor current does not exceed 25 A. | 250 | ||
| VSD – Phase A, B, or C input DCCT | HYP model drives. Determines if the cable at the input DCCT is connected; the input current in each phase to the VSD is measured during the precharge time and does not exceed 5 A in each phase. | 250 | ||
| VSD – Precharge lockout | All model drives. The VSD fails to make precharge; the precharge relay drops out for 10 s (fans and water pumps remain energized to cool the precharge resistors), precharge is retried, and fails on three consecutive tries. | The unit shuts down, locks out and displays this message. The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 250 | |
| VSD – Rectifier program fault | HYP model drives. After power is applied, the drive logic board verifies that the two software programs on the drive logic board are compatible with each other and that the application of the software matches the application of the VSD; they are not compatible. | 251 | ||
| Harmonic filter – High heatsink temperature | TM model drives. The temperature on any filter heatsink exceeds 167°F (75°C). | The chiller can be started after the fault condition clears, the OVERTEMP RESET button on the filter logic board is pressed, and the Clear button is pressed next to the listed event on the Systems Details screen. | 251 | |
| Harmonic filter – High baseplate temperature | VSD and LVSD model drives. The baseplate temperature exceeds the trip temperature. | The chiller can be started after the fault condition clears, the OVERTEMP RESET button on the filter logic board is pressed, and the Clear button is pressed next to the listed event on the Systems Details screen. | 251 | |
| Harmonic filter – High total demand distortion | TM, VSD, and LVSD model drives. OptiView shutdown indicating the filter is not operating correctly and the input current to the VSD/filter is not sinusoidal; the TDD exceeds 25% continuously for 45 s. In the YORK-supplied filter option, displayed TDD is the total RMS harmonic current supplied by the main power to the VSD divided by the chiller FLA, in percent (a standard VSD without the filter typically has an input current TDD of about 28% to 30%). | The chiller can be started after the Clear button is pressed next to the listed event on the Systems Details screen. | 251 |
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