Cause : RUN DISABLED comes when no Run enable signal received due to external reason or faulty control wiring in drive.

The code FF54 in your ABB ACS800 drive indicates a "Run Disabled" condition. This means the drive is not allowing the motor to start or run, even though a start command might have been issued.

1. Check setting of parameter 16.01.
2. Switch on signal or check wiring of selected source.