On the display
The panel prints VSD - HIGH PHASE A MOTOR BASEPLATE TEMPERATURE, and the manuals use only this wording for the message — there are no variants. It is listed among the safety shutdown messages, so it appears because the chiller has tripped and shut down.
What it means
The chiller has shut down because the motor baseplate temperature of phase A exceeded its high limit, which the chiller manual gives as 190°F (87.7°C). The VSD manual describes the measurement behind the message: the motor/inverter IGBT module temperatures are continuously monitored by the gate driver board, which reads the highest temperature for each phase and sends it to the VSD logic board. The logic board compares that temperature against a threshold value, and this shutdown occurs if any IGBT module on the motor/inverter exceeds it.
Why it appears
- Motor baseplate overtemperature on phase A: the temperature rose past the high limit of 190°F (87.7°C), so the chiller shut down.
- Seen from the drive side: the highest phase A IGBT module temperature read by the gate driver board exceeded the threshold value checked by the VSD logic board.
Setpoints and thresholds
- Shutdown limit, motor baseplate (phase A): 190°F (87.7°C) per the chiller manual.
- Shutdown value by VSD drive model: 190°F (87.8°C) on drive models including 0490 and 0774; 180°F (82.2°C) on the drive rated 380-414 VAC; 170°F (76.7°C) on the drive rated 460 VAC.
- Fault-reset threshold: 165°F (73.8°C) per the chiller manual — the baseplate temperatures of all phases must drop below it; the VSD manual gives 165°F (73.9°C) for all the IGBT modules.
- Post-trip fan and pump control: the shutdown control was changed in April 2016 so that the VSD fans and water pumps run for 2 minutes after the fault and are then de-energized; without this change they remain energized until the reset threshold is reached.
Reset and restart
After the trip, the VSD fans and water pumps stay energized until the motor baseplate temperatures of all phases drop below the fault-reset threshold of 165°F (73.8°C); the VSD manual states the cooling fans and pumps run until all IGBT modules fall below 165°F (73.9°C). On units with the April 2016 change, they instead run for 2 minutes after the fault and are then de-energized. The manual then states: When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed.
Questions engineers ask
What does VSD - HIGH PHASE A MOTOR BASEPLATE TEMPERATURE mean on a YORK YMC2?
The chiller has shut down because the phase A motor baseplate temperature exceeded its high limit of 190°F (87.7°C). In the drive, the trip occurs when the highest phase A IGBT module temperature read by the gate driver board exceeds the threshold checked by the VSD logic board.
How do I reset the VSD - HIGH PHASE A MOTOR BASEPLATE TEMPERATURE fault?
Once the temperatures of all phases are below the fault-reset threshold of 165°F (73.8°C), press the CLEAR FAULTS button. The chiller can then be started.
Why are the VSD fans and water pumps still running after this shutdown?
After the trip they remain energized until the temperatures of all phases drop below 165°F (73.8°C). With the April 2016 change they instead run for 2 minutes after the fault and are then de-energized.
At what temperature does the YMC2 VSD trip on baseplate temperature?
The chiller manual gives a high limit of 190°F (87.7°C). The VSD manual's table lists 190°F (87.8°C) for drive models including 0490 and 0774, 180°F (82.2°C) for the 380-414 VAC drive, and 170°F (76.7°C) for the 460 VAC drive.
Messages next to this one
Source
Written from the manufacturer's manuals for the YORK YMC2; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YMC2 messages: fault codes · YORK YMC2 documentation · YORK manuals