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ATV71 or ATV61 What causes the drive to show a PRF fault code?

Issue:
What causes the drive to show a PRF fault code?

Product line:
Altivar ATV71 ATV61

Environment:
All models, all serial numbers 

Cause:
This fault is displayed when internal diagnostics determines that the drive has lost its ability to detect when power is removed from the PWR terminal..

Resolution:
Cycle power on the VFD to reset the fault.  This fault is not related to an activation of the safety function.
This fault is due to damage on the drive.  Repeated faults will require repairing the drive by replacement of the control board and/or power board. Consider returning the VFD for repair.

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