Cause : Mechanical brake opening not allowed comes when the drive is preventing the mechanical brake from disengaging when it is supposed to. This fault typically occurs due to safety or operational reasons to prevent unintended movement or damage.

The fault code "A7A5 Mechanical brake opening not allowed" on the ABB ACS560 drive indicates that the drive is preventing the mechanical brake from opening (disengaging) due to a detected fault or safety condition.

1. Check mechanical brake settings in parameter group 44 Mechanical brake control.
2. Check that the acknowledgment signal (if used) matches the actual status of the brake.