On the display
The panel prints SYS X HIGH VSD BASEPLATE TEMP, where X is the system number. In the manual's full display string the message is preceded by a status field shown as YYYYYYY, which reads FAULT while the condition is present (the system restarts when cleared) or LOCKOUT after repeated trips.
What it means
This is a software-generated VSD safety: the IGBT baseplate temperature in a compressor's inverter power module has exceeded the software trip point. It is a system fault for all units, and the unit shuts down with a controlled ramped shutdown. The manual notes that 3-compressor chillers operate at higher baseplate temperatures than 4-compressor chillers, which is why their trip limit is set higher.
Why it appears
- The inverter power module baseplate temperature on one or more compressors rose above the software limit for the chiller size.
- Each compressor's inverter power module contains an internal temperature sensor that monitors baseplate temperature; the control compares these sensor readings in software against the limit for the configuration.
Setpoints and thresholds
- 2-compressor chillers: each system's sensor is compared individually to a limit of 218°F.
- 3-compressor chillers: the baseplate temperatures of compressors 1 and 3 are OR'd together and the highest is compared in software to 232°F; compressor 2's individual power module sensor is also compared to 232°F.
- 4-compressor chillers: compressors 1 and 3 are OR'd together and compressors 2 and 4 are OR'd together, each compared in software to a limit of 218°F.
- Restart threshold: the system is allowed to restart when the inverter power module baseplate temperatures fall below 165°F.
- Lockout threshold: the safety locks out on the 3rd fault within 90 minutes.
Reset and restart
This is an auto-restart safety. After a fault the fan(s) and water pump remain energized until the inverter power module baseplate temperature(s) fall below 165°F; the system is allowed to restart once the baseplate temperatures drop below this value. If the safety trips a 3rd time within 90 minutes, the unit locks out and will not restart until the operator clears the fault using the keypad.
Questions engineers ask
What does SYS X HIGH VSD BASEPLATE TEMP mean on a YORK YCAV?
It is a software-generated VSD safety: the IGBT baseplate temperature in a compressor's inverter power module exceeded the software trip point, and the unit shuts down with a controlled ramped shutdown. It is a system fault for all units.
What temperature trips the HIGH VSD BASEPLATE TEMP fault?
218°F on 2-compressor and 4-compressor chillers, and 232°F on 3-compressor chillers. On 3-compressor units the sensors of compressors 1 and 3 are OR'd together and compressor 2 is compared individually, both against 232°F.
How does the YORK YCAV recover from a VSD baseplate temperature fault?
The fan(s) and water pump stay energized until the baseplate temperature falls below 165°F, after which the system is allowed to restart automatically. On the 3rd fault within 90 minutes the unit locks out and must be cleared by the operator via the keypad.
Why do the fans and water pump keep running after this fault?
The manual specifies that after the fault the fan(s) and water pump remain energized until the inverter power module baseplate temperature(s) fall below 165°F, the value below which a restart is allowed.
Messages next to this one
Source
Written from the manufacturer's manuals for the YORK YCAV; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YCAV messages: fault codes · YORK YCAV documentation · YORK manuals