MM Safety Test Stop Fault

What does F30773 mean?

A safety test stop fault has occurred on the Motor Module (MM) side. This fault indicates that while the MM's internal states may be as expected, the required state was not present on the readback input of the other channel (Control Unit). This suggests an inconsistency in the safety test routine between the CU and MM, affecting the overall safety integrity and requiring investigation.

• Feedback signal for a safety-related output on the Motor Module (MM) (e.g., STO feedback, safe brake control) is not present or incorrect during a safety test.
• External wiring from the Motor Module's safety output to its feedback input is broken, short-circuited, or has high resistance.
• Mismatch between the expected state (set by SI parameters) and the actual readback state for a safety output on the MM.
• Internal fault within the Motor Module's Safety Integrated (SI) feedback monitoring circuitry or output stage.
• Incorrect parameterization of Safety Integrated functions specifically on the Motor Module (e.g., related to Safe Brake Control or STO feedback monitoring).

Click steps to track your progress.

1. 1

   Review the Safety Integrated (SI) parameters and configuration specific to the affected Motor Module (MM), especially those related to Safe Torque Off (STO) and Safe Brake Control feedback.

2. 2

   Perform a controlled safety test stop and use a multimeter to measure the state of the relevant safety inputs/outputs on the Motor Module (e.g., X21 terminals) to verify expected signal levels.

3. 3

   Inspect the wiring connected to the Motor Module's safety terminals (e.g., X21) for integrity, correct routing, and secure connections.

4. 4

   Check for any external safety components (e.g., contactors, relays) whose feedback is monitored by the MM; verify their correct mechanical and electrical operation.

5. 5

   If multiple Motor Modules are present, try swapping the suspected faulty MM with a known good one (if possible and safe) to isolate the component.