IndustrialDriveDataDrive Board & Diagnostic Database
Diagnostic workflow

Schneider ATV61 / ATV71 OCF and SCF Diagnostic Workflow

Entry symptom: ATV61/ATV71 trips on OCF overcurrent or SCF short circuit at start, ramp or load.

Safety controls before proceeding
  • Lock out and verify discharge before internal work.
  • Do not repeat powered tests into a suspected short.
  • Isolate motor/cable correctly before insulation testing.

Investigation sequence

1

Classify timing

Record whether the trip is instant at enable, during acceleration, during steady load or after a machine event.

2

Remove load assumptions

Check brake release, jammed machine, blocked pump/fan or load change before assuming electronics failure.

3

Prove motor/cable boundary

Inspect terminals and perform site-approved motor/cable insulation checks with the drive isolated.

4

Review parameters

Compare motor data, current limit, acceleration and control mode with the real machine.

5

Escalate to output stage

If evidence points inside the drive, check IGBT/static output and driver/current-sense path before replacing modules.

Stop conditions

  • Motor/cable insulation is not proven
  • Trip persists with unsafe test setup
  • Power module was recently replaced
  • Qualified discharge procedure is unavailable

Linked records

OCF
Overcurrent Fault

The drive has detected current beyond the permitted boundary. The first split is mechanical load, motor/cable condition, acceleration/current-limit setup and output-stage evidence.

Open →SCF
Motor or Output Short-Circuit Fault

The route begins at output cable, motor insulation, output-connected devices and the inverter power stage. It should not be treated as a keypad or control-terminal fault.

Open →Circuit
Schneider ATV61 / ATV71 Output Motor and Short-Circuit Path

Routes OCF and SCF evidence through motor cable, motor insulation, output terminals, optional output devices, IGBT bridge, current detection and gate-driver integrity.

Open →