What is a IGBT desaturation error (HDF) on an ATV320 drive?

Issue:
What is a control eeprom (EEF1) error on ATV320 drive?

Product Line:
Altivar 320

Environment:
All

Cause:
shorting or grounding at the output of the drive.

Resolution:
Check motor for issues.
Check wiring, output contactors if any, insulation.
Attempt to run VFD without a motor by turning off output phase loss under FLT-, Set OPL to no.
If drive fautls out on same issue with no connections on T1/T2/T3 then it could indicate an internal issue with VFD.