Hoist mechanical brake

What does 22 mean?

This warning/alarm signals a problem with the hoist mechanical brake control. It can be triggered if the required torque reference is not achieved before the timeout specified in parameter 2-27 Torque Ramp Up Time expires, or if the expected brake feedback is not received within the time limits set by parameter 2-23 Activate Brake Delay and parameter 2-25 Brake Release Time. This prevents proper control of the mechanical brake, which is critical for hoisting applications.

• Mechanical brake failing to open fully or sticking, preventing motor rotation.
• Incorrect setting of parameter 2-27 Torque limit before brake release timeout (duration too short).
• Motor output torque insufficient to overcome the load and fully release the brake (e.g., motor parameters P1-20/P1-22 incorrect).
• Malfunctioning brake control circuit (e.g., faulty brake relay, brake rectifier module).
• Motor encoder feedback issue, leading to inaccurate speed or position information affecting torque control (if encoder present).
• Brake coil wiring open circuit or short circuit (e.g., measured at terminals 96/97).

Click steps to track your progress.

1. 1

   Measure the actual current drawn by the brake coil at the brake terminals (e.g., 96/97) when commanded to open. Verify against nameplate current.

2. 2

   Check parameter 2-27 Torque limit before brake release timeout for appropriate duration (e.g., 0.5-2.0 seconds) relative to brake response time.

3. 3

   Verify the mechanical brake gap (e.g., 0.2-0.5 mm) and ensure free movement of the brake pads when energized.

4. 4

   Confirm motor parameters (e.g., P1-20 Motor Rated Current, P1-22 Motor Rated Voltage) are correctly configured for the connected motor.

5. 5

   Inspect the brake rectifier and any associated control relays for proper operation (e.g., measure output voltage to brake coil).

6. 6

   Observe motor current (P5-03 Actual Motor Current) during brake release attempt to confirm motor torque production.