F30021 Ground Fault fault in siemens drive

F30021 Ground Fault fault in siemens drive indicates that the drive has detected a current flowing to earth (ground). 

Cause
 
1. Insulation failure in motor cables.
2. Water/Moisture in motor.
3. Cable touching ground shield.
 

Remedy
 
- Disconnect motor cable and megger/test cable insulation. 
- Check motor termination box for moisture.

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