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How to troubleshoot an SCF3 fault on an Altivar Process Drive?

Published date: 19 March 2019

Troubleshooting an SCF3 fault on an Altivar Process Drive.

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

All products of Altivar Process Drive



SCF3 - Ground Short Circuit Fault
Earth fault at the output

Possible causes
  • Short circuit or earth fault at the inverter output.
  • Short circuit on a motor with long cables.
  • Insulation fault in the motor or in the cables.
  • Perform Diagnostic Test
    • IGBT or Transistor Test
  • Check the cables connecting the drive to the motor and the motor insulation.
    • Megger motor from cables. Use at least 1000v
    • Check for proper grounding
  • Check distance between drive and motor
    • Over 165 ft may require the use of a load reactor or filter
  • Check Switching Frequency
    • Lower it if possible


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