Brake Output Fault

What does 12.1 mean?

This fault indicates issues with the brake output, such as no brake connected, a disconnected brake cable when the brake is commanded 'ON', or an overload condition due to excessive current or frequent operation. This can lead to uncontrolled loads, mechanical damage, or safety hazards if the brake fails to engage or disengage correctly.

• Motor brake coil resistance too high or open circuit, indicating a disconnected brake or internal coil fault.
• Overcurrent condition on the brake output, potentially due to a short circuit in the brake cable or within the brake coil.
• Incorrectly configured brake control parameters (e.g., P1-60 brake current limit, P1-61 brake release time).
• External mechanical resistance or obstruction preventing the brake from releasing, causing sustained high current.
• Frequent brake operations exceeding the drive's output capability for the configured brake.

Click steps to track your progress.

1. 1

   Measure the resistance of the motor brake coil directly at the drive's brake output terminals (e.g., TB1/B+ B-) and compare to motor nameplate data.

2. 2

   Check for continuity of the brake cable wires from the drive's output terminals to the brake's connection point (0 Ohms).

3. 3

   Verify the brake current limit (P1-60) is set correctly based on the motor brake's rated current (e.g., from motor datasheet).

4. 4

   Monitor the actual brake current (e.g., P1-62) during a brake release command to detect overcurrent conditions.

5. 5

   Inspect the mechanical state of the brake for binding, foreign objects, or excessive wear preventing release.