Cause : Auxiliary fan broken comes when an auxiliary cooling fan is stuck or disconnected. This auxiliary fan can provide extra cooling when needed, particularly during periods of high load or operation in hot environments.

A 5E01 fault code in your ABB ACS880 drive indicates a faulty auxiliary fan. The auxiliary fan is a secondary cooling fan within the drive that helps maintain proper airflow and prevent overheating.

1. Check the fan operation and connection.
2. Replace the fan if faulty.