IGBT Desaturation

What does HdF mean?

A hardware detected error, specifically related to IGBT desaturation. This indicates a very high voltage drop across an IGBT, often due to a short circuit in the motor or power wiring, or an internal IGBT failure. This is a critical fault that can lead to immediate hardware damage if not addressed.

• IGBT (Insulated Gate Bipolar Transistor) has detected an overcurrent or overvoltage condition.
• Inadequate heatsink temperature (P1-30) leading to IGBT thermal protection.
• Power supply fluctuations (e.g., P3-01) causing IGBT stress.
• Short circuit on the motor or output terminals.

Click steps to track your progress.

1. 1

   Immediately inspect motor wiring and connections for any signs of short circuits to ground or phase-to-phase.

2. 2

   Measure insulation resistance of the motor phases to ground and between phases using a megger (expect >1 MΩ).

3. 3

   Check the drive's output terminals for signs of arcing, carbon buildup, or damage.

4. 4

   If external wiring is verified clear, the drive's power section (IGBTs) may be damaged and require replacement.