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ATV312 Why is the drive tripping on SCF or short circuit fault on power up?

ATV312; Why is the drive is tripping on SCF or Short Circuit Fault on power up?

Product line:
Altivar 312, ATV312, ATV31

All models, all serial numbers 

The drive trips on a SCF or a Short Circuit Fault if the drive detects a short circuit on the output of the drive.       

Make sure all of the motor parameters are set in the DRC menu to match the motor name plate.  
Check to make sure they don't have a long cable run of more them 100 feet if they do, we recommend installing a output load reactor.
Test the drive operation without the motor connected;  turn off OPL (output phase loss) in the FLT menu. Try running the drive open circuit at 15, 30, 45 and 60hz checking the output voltage phase to phase with a true RMS digital meter for balance at each frequency level.
Remedy for SCF -Check the motor and cables connecting to the drive for shorts phase to phase and phase to ground.  Check connections in the motor junction box for proper wiring.  Reduce the switching frequency (SFR).  Install a motor protecting output filter or load reactor at the output of the drive.
If the SCF fault occurs with no motor or wiring connected to the drive, the drive will need to be replaced.
Refer to the ATV312 Programming manual BBV46385.

Note that similar steps apply to the ATV12, ATV11, ATV32 and other Altivar Drive Products.
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