A105 warning in ABB DCS880 drive indicates Dynamic braking acknowledge. This means dynamic braking is still pending.

The firing angle is forced to the value of 30.45 Maximum firing angle and single firing pulses to suppress the DC current are given, thus the drive cannot be started or re-started while dynamic braking is active, except if 21.01 Start mode = Flying start dynamic braking.

1. Check the setting of 20.43 Dynamic braking acknowledge source.
2. Check the setting of 21.01 Start mode.