Mechanical Brake Low

What does 63 mean?

The actual motor current failed to exceed the configured 'release brake' current within the specified 'start delay' time window. This indicates that the mechanical brake did not disengage as expected during the startup sequence, preventing the motor from moving.

• Mechanical brake itself is faulty or stuck, preventing disengagement despite receiving power.
• Brake control circuit (e.g., external brake relay, contactor) is not energizing the brake correctly, or the voltage is insufficient (e.g., below 90% nominal).
• Incorrect setting of Parameter P1-70 (Brake release current) or P1-72 (Brake start delay), causing an early or insufficient current check.
• High friction or physical obstruction preventing the motor from rotating freely even after the brake is commanded to release.
• Drive's current measurement is inaccurate or has a zero-offset error, leading to a false 'low current' detection.

Click steps to track your progress.

1. 1

   Manually actuate the mechanical brake (if possible) and observe its physical movement and release mechanism.

2. 2

   Measure the voltage supplied to the mechanical brake's coil during the release command, verifying it meets the brake's nominal voltage specification.

3. 3

   Verify Parameters P1-70 (Brake release current) and P1-72 (Brake start delay) are correctly configured for the specific brake and application.

4. 4

   With the motor decoupled from the load, attempt to rotate the shaft manually to confirm no mechanical binding (motor side).

5. 5

   Check the state of the digital output assigned to brake control (e.g., Terminal 29, 30) on the drive to confirm it is commanding the brake correctly.