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

    Issue:
    How do I 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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