F070 fault in WEG CFW900 Drive indicates a DC Link Short Circuit. This means a massive current spike was detected at the output or DC link, usually caused by a physical short circuit.
Cause:
- Short circuit between two motor phases.
- Short circuit on the connecting cables of the dynamic braking.
- IGBT modules are short-circuited.
Remedy:
Check output motor cabling for phase-to-phase short-circuits. Check dynamic braking connection leads. Verify IGBT module conditions.
