Heatsink sensor fault

What does 39 mean?

The frequency converter is not receiving a temperature signal from the heatsink sensor, specifically the IGBT thermal sensor on the power card. This loss of feedback means the drive cannot monitor critical internal temperatures, posing a significant risk of overheating and damage to the power semiconductors if not resolved.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the integrity and connections of the gate drive card, as it processes the sensor signal.

2. 4

   If all previous checks are inconclusive, the power card itself may be defective and require replacement.