Schneider Electric · Altivar ATV320Fault Code SCFCritical
Schneider Altivar — SCF Output Short Circuit
Raised when a phase-to-phase or phase-to-ground short is detected on the output. Motor/cable or output stage related.
Updated: 2026-07-05
Symptoms
- SCF and stop on start
- Immediate fault with motor connected
- Fault may change when cable removed
Probable Causes
- Short in the motor cable
- Motor winding insulation breakdown
- Output stage (IGBT) short
Checkpoints
- Megger the motor and cable separately
- Check the IGBT with diode-test
- Inspect the output terminals
Solution
If an IGBT short is confirmed, the gate-driver circuit must also be checked before fitting a new module; otherwise it will fail too.
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