Cause : Fan comes when cooling fan is stuck or disconnected, which is crucial for maintaining the appropriate temperature of the drive components.

An AE73 "fan" fault in ABB ACS880 drive indicates a cooling fan issue. This fault signifies that the drive has detected a problem with the fan responsible for maintaining proper internal temperature.

1. Check the auxiliary code in the line-side converter program to identify the fan.
2. Check fan operation and connection.
3. Replace fan if faulty.