Cause : Cooling fan comes when the scheduled maintenance time for the cooling fan has been reached. This is a preventive measure to ensure the cooling fan is functioning properly to avoid overheating issues and ensure the longevity of the drive. 

A88F warning in abb acs560 drive indicates that maintenance timer limit exceeded, so replace the cooling fan to correct the fault.

1. Replace the drive cooling fan.
2. Parameter 05.04 Fan on-time counter shows the running time of the cooling fan.