A103 warning in ABB DCS880 drive indicates DC-breaker acknowledge. This means DC-breaker acknowledge at the DI is missing.

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 the DC-breaker acknowledge is missing.

• Check the setting of 20.35 DC breaker acknowledge source, if necessary invert the signal.