Mechanical brake opening failed

What does 71A3 mean?

A mechanical brake control fault has occurred because the brake acknowledgment signal was not as expected during the brake opening sequence. This implies either the brake did not open, its feedback mechanism failed, or it is stuck, potentially preventing motor rotation or causing excessive load.

• Mechanical brake solenoid or coil failure (e.g., high resistance, coil seized, insufficient force).
• Brake feedback switch (e.g., microswitch, proximity sensor) malfunction or incorrect adjustment (stuck in 'closed' position).
• Wiring fault in the brake control circuit or feedback circuit (e.g., loose terminal X5-1, X5-2 or X6-3, X6-4).
• Incorrect brake timing parameter (e.g., P20-02 Brake open delay) causing a timeout before physical opening.
• Insufficient voltage or current from the drive's brake control output to fully release the brake.

Click steps to track your progress.

1. 1

   Measure the voltage output at brake terminals (e.g., X5-1, X5-2) when attempting to open the brake (e.g., 24VDC or 230VAC).

2. 2

   Verify the operation of the brake feedback switch by manually releasing the brake and checking continuity across feedback terminals (e.g., X6-3, X6-4).

3. 3

   Inspect all wiring connections between the drive's brake control terminals (e.g., X5) and the brake assembly for looseness or damage.

4. 4

   Adjust brake delay parameters (e.g., P20-02 Brake open delay) to ensure sufficient time for brake release and feedback activation.

5. 5

   Mechanically inspect the brake mechanism for debris, wear, or binding preventing full release.