What are the probable causes of HDF fault on Altivar 71 drive.

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HDF(IGBT Desaturation) fault appears only on the drive >90KW when a short-circuit is present on the IGBT module by measurement of the transistor desaturation.

Probable causes:

Short circuit or grounding on the output phases.
Transistor IGBT in short circuit

Remedies:

Check the insulation motor and the wiring.
There is a cabling mistake in the drive (bad connection of connector on the boards)
Bad tightening of nuts on the gate drive boards
Disturbances on the control cable (logic input, power removal PWR, +24V...)
Made transistor diagnostic.
Change power board, gate drive board or transistors.

Note: The insulation test on the motor and motor cables must be made at 1000V.