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What does the IGBT desaturation HDF fault mean on the ATV61 and ATV71 drives?
Altivar ATV61 and ATV71
Short circuit or grounding on the output phases
Transistor IGBT is shorted out.
Check the motor insulation and wiring
Run the Transistor test in the diagnostics menu
Try dropping the motor leads, turn off OPL and try running the motor open circuit at 20, 40 and 60hz. Check the output voltage at each speed to see if they are balanced.