The fault code FF83 in your ABB ACS800 drive indicates a warning related to the step-up module's output filter fan. This fan helps cool the filter components within the step-up module, which is a part of the drive used in specific configurations (like multi-component drives).

1. An FF83 warning signifies the drive has detected an issue with the fan's operation.
2. Stop drive. Let it cool down.
3. Check ambient temperature.
4. Check fan rotates in correct direction and air flows freely.