Safety System Fault

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This fault encompasses diverse issues related to the drive's safety functions. It can be triggered by an active Safe Off signal preventing drive readiness, incorrect safety configuration (e.g., wrong safety switch installation, incorrect STO board placement or count, incompatibility), safety diagnostics failures (e.g., STO input status mismatch, ATEX thermistor connection issues or short circuits), or the activation of the Safe Torque Off (STO) function itself (e.g., via emergency stop). These faults indicate a compromise in the drive's ability to maintain a safe operating state and require careful investigation.

• Active Safe Torque Off (STO) signal (e.g., terminals STO1, STO2) preventing drive readiness, either intentionally or due to a wiring fault.
• Incorrect safety function parameter configuration (e.g., P6-50 Safety Function Type) not matching the application's safety requirements.
• Failure of an external safety device (e.g., emergency stop button, safety gate switch) connected to the drive's safety inputs.
• Internal self-test failure of the drive's safety circuit components.
• Mismatch in parameter checksums or safety firmware version after a configuration change.

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1. 1

   Verify the state of all safety inputs (e.g., STO1, STO2) using a multimeter to confirm the expected voltage levels (e.g., 24VDC for active, 0VDC for inactive).

2. 2

   Check the wiring of external safety devices connected to the drive's safety inputs for breaks, short circuits, or incorrect connections.

3. 3

   Review the safety-related parameters (e.g., P6-50, P6-51) in the drive and ensure they match the certified safety configuration.

4. 4

   Cycle the drive's input power after confirming all safety inputs are in their 'safe' or 'ready' state, as required by the application.

5. 5

   Perform a safety circuit test (if available through HMI or software) to verify the internal logic and hardware of the drive's safety functions.