Cause : Mechanical brake comes when acknowledge brake applied (closed) is missing or torque actual does not reach StrtTorqRef (42.08), during torque proving.

A122 mechanical brake alarm in ABB DCS800 drive indicates an issue with the mechanical brake system. This could be related to the brake's engagement time, release time, or overall functionality.

Troubleshooting Steps:

1. Visually inspect the brake pads for wear and damage.
2. Ensure that the brake mechanism is free of obstructions and can move freely.
3. Review the brake parameter settings, such as engagement time, release time, and current limit.
4. Ensure that the signal is reaching the brake control system and triggering the brake as expected.