Cause : EXTERNAL FAULT comes when fault in external device. This information is configured through one of programmable digital inputs.

The code 9000 in your ABB ACS800 drive indicates an "External Fault". This is a general fault signifying that the drive has received a fault signal from an external device connected through one of its programmable digital inputs.

1. Check external devices for faults.
2. Check parameter 30.03 EXTERNAL FAULT.