Cause : Mechanical brake closing failed comes when the drive has detected an issue with the mechanical brake not engaging properly. This could be due to a variety of reasons such as wiring issues, brake coil faults, or incorrect parameter settings. 

The A7A1 "Mechanical Brake Closing Failed" fault on an ABB ACS560 drive indicate an issue with the mechanical brake not engaging properly. This can be due to various factors such as wiring issues, brake coil faults, mechanical obstructions, or incorrect parameter settings.

1. Check mechanical brake connection.
2. Check mechanical brake settings in parameter group 44 Mechanical brake control.
3. Check that acknowledgment signal matches the actual status of the brake.