Cause : Heat sink sensor comes when no feedback from the heat sink temperature sensor. The signal from the IGBT thermal sensor is not available on the power card.

• This alarm is equivalent to alarm 39, Heat sink sensor.
• The report value in the alarm log indicates which drive module generated the alarm: 1 = Left drive module. 2 = Second drive module from left. 3 = Third drive module from left (in 4-module module systems). 4 = Fourth drive module from left (in 4-module module systems).

Check the following:

1. Power card.
2. Gatedrive card.
3. Ribbon cable between the power card 
4. the gatedrive card