YORK YMC2 — VSD - HIGH PHASE A INPUT BASEPLATE TEMPERATURE

The control center shows VSD - HIGH PHASE A INPUT BASEPLATE TEMPERATURE when this safety shutdown trips the chiller. The manuals print the message in this one wording; there are no display variants. The unit is stopped, and the message stays on the panel until the fault has been cleared and the chiller is started again.

The message reports an input rectifier phase A baseplate overtemperature. The Input Baseplate Temperature monitored on the VSD rose above the shutdown value that applies to the drive model installed in the chiller, and the drive tripped the unit. The message names phase A of the input rectifier; clearing the fault nevertheless requires the temperatures of all three rectifier phases to be below the fault-reset threshold.

• The Input Baseplate Temperature exceeded the shutdown value for the given model of drive. The manuals list one trip value per drive model (see the values under Settings) and give no other cause for this shutdown.

1. After the trip, expect the VSD fans and water pumps to stay energized: the manuals require them to keep running until the temperatures of all three rectifier phases drop below the fault-reset threshold of 165°F (73.8°C).
2. Note which post-trip behavior the drive shows. With the software versions introduced in April 2016, the shutdown control keeps the fans and pumps running for 2 minutes after the fault, and they are then de-energized — this is the intended sequence, not a second fault.
3. Wait for the condition to clear: the temperatures of all three rectifier phases below the reset threshold.
4. Press the CLEAR FAULTS button and start the chiller, as described under Reset.

• 190°F (87.8°C) — shutdown value for drive models 490 and 0490A; one manual adds two further drive models to this row.
• 170°F (76.6°C) — shutdown value for drive model 744.
• 170°F (76.7°C) — shutdown value for drive model 0774.
• One further drive model is listed with a supply-dependent value: 170°F (76.7°C) at 380-414 VAC and 150°F (65.6°C) at 460 VAC.
• 165°F (73.8°C) — fault-reset threshold; the temperatures of all three rectifier phases must be below it before the fault can be cleared.
• 2 minutes — how long the VSD fans and water pumps run after the fault with the software versions introduced in April 2016, after which they are de-energized.

Reset is done with the CLEAR FAULTS button once the condition has cleared; the manuals give one reset path for this shutdown: When the condition clears, the chiller can be started after the CLEAR FAULTS button is pressed. The condition is cleared when the temperatures of all three rectifier phases are below the fault-reset threshold of 165°F (73.8°C).