73A0 fault in ABB DCS880 drive indicates Speed feedback configuration. This means the speed feedback configuration via encoder interface modules has changed.

1. Adapter not found in specified slot.
2. Check module location.
3. Check the module type parameters 91.11 and 91.13 against status parameters 91.02 and 91.03.
4. Encoder type incompatible with interface module type.
5. Check module type parameters 91.11 and 91.13 against encoder type parameters 92.01 and 93.01.