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What is an inFb fault code on an ATV320 drive?

Issue:
What is an inFb on an ATV320 drive?

Product Line:
Altivar 320, Altivar Machine ATV320

Environment:
All

Cause:
inFb - Internal th. sensor fault
The drive temperature sensor is not operating correctly.

Resolution:
The temperature sensor is not available as a replacement part. 
Replacement of VFD may be needed.
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