Issue:
Troubleshooting an SCF3 fault on an Altivar Process Drive.

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

Environment:
All products of Altivar Process Drive

Cause:
N/A

Resolution:

Description
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.

Remedies

• 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

Publisert for: Schneider Electric Norway