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How do I troubleshoot an Altivar Process Drive with an SCF1 (Motor Short Circuit) Fault?

Published date: 13 August 2019

Issue:
Needs to Troubleshoot an Altivar Process Drive with an SCF1 (Motor Short Circuit) Fault.

Product Line:
Altivar Process Drive (ATV630, ATV930, ATV650, ATV950, ATV660, ATV960, ATV680, ATV980)

Environment:
All serial numbers for Altivar Process Drive

Cause:
N/A

Resolution:

Description
The drive is protected against short circuit between the phase output and phase and phase to the ground. When there is a short circuit, the inverter indicates the fault message SCF1

Cause
  • Short circuit at the inverter output.
  • Short circuit or earth fault in the motor or motor cable.
  • Earth fault.

Remedies
  • Verify the cables connecting the drive to the motor, and the motor insulation.
  • Adjust the switching frequency.
  • Connect chokes in series with the motor
  • Increase the [Time to restart] ttr
  • Connect chokes in series with the motor.
  • Verify the adjustment of speed loop and brake.
  • Disconnect motor from drive and disable Output Phase Loss [Complete settings] [Error/Warning handling] [Output phase loss], then run the drive with no motor connect.
    • Check voltage for balancing.

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