Cause : Speed feedback configuration comes when speed feedback configuration has changed due to adapter not found in specified slot.

The fault code A797 in your ABB ACS880 drive indicates a Speed feedback configuration warning. This warning signifies a potential issue with the configuration of the system used to provide feedback on the motor's speed to the drive.

Check the auxiliary code (format XXYY ZZZZ). “XX” specifies the number of the encoder interface module (01: 91.11/91.12, 02: 91.13/91.14, “YY” specifies the encoder (01: 92 Encoder 1 configuration, 02: 93 Encoder 2 configuration). “ZZZZ” indicates the problem (see actions for each code below).