IndustrialDriveDataDrive Board & Diagnostic Database
Diagnostic workflow

PowerFlex F12 / F13 Output Fault Diagnostic Workflow

Entry symptom: PowerFlex drive reports F12 hardware overcurrent, F13 ground fault, or both around the same start/run event.

Safety controls before proceeding
  • Isolate supply and verify DC bus discharge before output work.
  • Do not megger through the drive.
  • Do not repeatedly reset into a suspected short or ground fault.

Investigation sequence

1

Classify event timing

Record whether the trip happens at enable, acceleration, steady load or intermittently with moisture/cable movement.

2

Preserve fault queue

Record whether F12, F13 or another protection fault occurred first.

3

Inspect external path

Check motor terminal box, cable, shielding, output terminals, mechanical jam and brake release.

4

Isolate motor/cable

Perform insulation and cable tests only after the motor/cable is correctly disconnected from the drive.

5

Escalate internally

If the fault persists with a proven external path, inspect output bridge, gate-driver and current-sense evidence.

Stop conditions

  • Motor/cable isolation is not possible
  • Fault persists with output path disconnected
  • Previous module replacement is undocumented
  • Machine brake/load cannot be secured

Linked records

F12
HW Overcurrent Fault

The hardware current protection has detected a severe current event. The first split is motor/cable/load versus output bridge, gate-driver, current sensor or power-module damage.

Open →F13
Ground Fault

The drive has detected output current imbalance or leakage to ground. The route begins with motor, cable, moisture, output terminals and output-stage evidence.

Open →Circuit
PowerFlex Output Current and Ground-Fault Path

Routes F12 and F13 evidence through output bridge, current sensing, motor cable, motor insulation, grounding/shielding and mechanical load conditions.

Open →