Cause : Inverter temperature comes when the temperature inside the drive's inverter section has exceeded its safe operating limit.

The A022 alarm in siemens master drive an inverter temperature alarm. This alarm indicates that the temperature inside the drive's inverter section has exceeded its safe operating limits.

1. Measure intake air or ambient temperature.
2. Observe the derating curves at theta >50°C (Compact PLUS) or 40°C.
3. Check whether the fan is operating.
4. Check whether the air entry and discharge openings are restricted.