Mechanical brake closing failed

What does 71A2 mean?

A mechanical brake control fault has occurred because the brake acknowledgment signal was not as expected during the brake closing sequence. This implies either the brake did not close, its feedback mechanism failed, or an obstruction is present, leaving the motor potentially unsecured or unable to hold position.

• Mechanical brake solenoid or coil failure (e.g., open circuit, short circuit, coil seized).
• Brake feedback switch (e.g., microswitch, proximity sensor) malfunction or incorrect physical adjustment.
• 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., P20-01 Brake delay) causing a timeout before physical closure.
• Excessive mechanical resistance or foreign material in the brake mechanism preventing full closure.

Click steps to track your progress.

1. 1

   Measure the resistance of the brake coil at terminals X5-1 and X5-2 to confirm coil integrity (e.g., 20-50 Ohms).

2. 2

   Verify the operation of the brake feedback switch by manually actuating 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., P20-01 Brake close delay) to ensure sufficient time for brake closure and feedback activation.

5. 5

   Mechanically inspect the brake mechanism for debris, wear, or misalignment preventing full closure.