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What would cause the ATV61 or ATV71 drive to trip on an SOF overspeed fault?

Issue:
What would cause the ATV61 or ATV71 drive to trip on an SOF overspeed fault?

Product Line:
Altivar ATV61, ATV71

Environment:
All

Cause:
This fault appears when an overspeed is present on the drive.  Unstable or to large an overhauling load.

Resolution:
The threshold is 110% of the TFR parameter and during 250 ms in open or closed loop mode.
Check the motor parameters and the speed feedback loop if it applies.
Adding a breaking resistor.
Check the size of the motor, drive and or load.

 

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