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What can cause an OC3P fault on the ATV21 and ATV212 drives?

Published date: 06 June 2019

Issue:
S-Flex 212 drive is going into 0C3P fault on power up.  What can cause this to happen?

Product Line:
Altivar 21, 212, S-flex

Environment:
All

Cause:
Drive is detecting a ground short or a motor short circuit on the output of the drive.

Resolution:
OC3P means you are getting a ground fault.  Its as short circuit  or ground fault during constant speed operation.

Troubleshooting Tips:
-Try turning off the OPL F605= 0 and running the drive open circuit at 20hz 40hz and 60hz. Using a digital true RMS meter, measure output voltage from the drive (phase to phase) to see if they are balanced at each frequency.
If the drive's output voltages are ok,:
-Try dropping the motor leads and megger out the motor and cables with a 1KV megger.
Check your grounding connections
- Double-check all of your motor parameters settings in the drive. See the article on basic programming for assistance.


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