Cause : Monitoring U_ce comes when the monitoring of the collector-emitter voltage (U_ce) of the semiconductor has responded.

F30022 fault in siemens 6RA80 DC Drive indicate Monitoring U_ce condition. This means there is an hardware issue in drive power card.

Possible causes:

• Fiber-optic cable interrupted.
• Power supply of the IGBT gating module missing.
• Short-circuit at the power unit output.
• Defective semiconductor in the power unit.

Remedy:

1. Check the fiber-optic cable and if required, replace.
2. Check the power supply of the IGBT gating module (24 V).
3. Check the power cable connections.
4. Select the defective semiconductor and replace.