SI CU: Brake Control Error

What does 201630 mean?

The drive's Safety Integrated (SI) function on the Control Unit (CU) has detected a brake control fault, leading to a STOP A reaction. Causes vary widely depending on the fault value, encompassing issues such as incorrect parameter p1278, missing or broken brake connections, ground faults in the brake cable, short-circuits in the brake winding, or internal faults within the CU's brake control circuit or its communication with the Motor Module.

• Discrepancy between the Safety Integrated (SI) brake control output and the actual brake feedback signal (e.g., limit switch).
• Wiring fault (e.g., open circuit, short circuit, incorrect connection) in the brake control circuit or brake feedback loop.
• Excessive wear or mechanical obstruction of the holding brake, preventing it from reliably engaging or disengaging.
• Brake test (e.g., P1215 "Brake control test") failure due to insufficient brake torque during the test sequence.
• Incorrect parameterization of brake control functions (e.g., P1210 "Brake control mode", P1216 "Brake holding torque") in the CU.

Click steps to track your progress.

1. 1

   1. Record the fault value (r0949) for a precise sub-code description of the brake control error from the Control Unit (CU).

2. 2

   2. Measure the voltage and current at the brake terminals (e.g., X52) during brake engage and disengage commands.

3. 3

   3. Inspect the brake feedback switch (e.g., F1) for proper operation and verify wiring continuity back to the Control Unit.

4. 4

   4. Manually check the mechanical brake for free movement, wear limits, and proper adjustment (e.g., air gap measurement).

5. 5

   5. Review and adjust brake control parameters (e.g., P1210, P1215, P1216) according to the machine's safety manual and specifications.

6. 6

   6. If equipped, perform a functional safety test of the brake system, ensuring the brake holding torque meets specified values.