Issue:
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

Causes

• 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 (Megger test with the motor disconnected from the drive).
• Verify motor nameplate data has been entered properly in the drive and that an autotune has been completed (when motor is at room temperature).
• Go to Diagnostics menu and perform the IGBT test with motor when the motor is connected.  If Not OK, then disconnect the motor and perform the IGBT test w/o motor.
• Reduce the switching frequency.
• Connect a load reactor (output choke) between the drive and the motor.
• Test the drive in an open loop mode (motor disconnected) to verify that the drive can operate without the error and generate balanced output voltages at several different speeds:
  • Disconnect motor from drive and deactivate Output Phase Loss [Complete settings] [Error/Warning handling] [Output phase loss],
  • Change Motor control type [Complete Settings,/Motor parameters to U/F VC 5pts
  • run the drive with no motor connect.
    • Check for balanced output voltages (phase to phase) at several speeds.

Publicerad för:Schneider Electric Sverige