Mechanical brake closing failed

What does 71A2 mean?

A mechanical brake control fault occurred during brake closing in the ACS880 drive. This is typically activated if the brake acknowledgement signal is not as expected, indicating the brake did not close properly.

• Mechanical binding or obstruction preventing the brake from closing fully.
• Incorrect wiring or a faulty sensor for the brake acknowledgement signal, providing incorrect feedback.
• Misconfigured parameters in group 44 Mechanical brake control (e.g., brake closing delay, acknowledgement signal source, 44.17 Brake fault function).
• Insufficient current or voltage supplied to the brake coil, preventing full engagement.

Click steps to track your progress.

1. 1

   Inspect the mechanical brake assembly for any physical obstructions, excessive wear, or damage that prevents proper closing.

2. 2

   Verify the wiring and functionality of the brake acknowledgement switch or sensor (e.g., limit switch, proximity sensor).

3. 3

   Check that the acknowledgement signal matches the actual brake status in the drive's I/O diagnostics.

4. 4

   Review parameter group 44 Mechanical brake control, specifically 44.17 Brake fault function and related settings for closing sequence and delays.

5. 5

   Measure the voltage and current supplied to the brake coil to ensure it meets the brake manufacturer's specifications for engagement.