HBBF fault in YASKAWA drives indicates a Safe Disable Signal Input circuit error. This means one Safe Disable channel is open while the other channel is closed.

Potential Causes of HBBF Fault Related to Safe Disable Signal Input:

• Safety Device Failure: The external safety device (e.g., emergency stop button, safety relay) might be faulty or not functioning correctly.
• Communication Issues: Problems with the communication between the VFD and the safety device can cause the HBBF fault.
• Wiring Errors: Incorrect wiring or loose connections between the VFD and the safety device can lead to communication errors.
• Configuration Issues: Incorrect configuration of the safety device or the VFD's safety settings.

Troubleshooting Steps:

1. Check Safety Device:
   • Inspect the safety device for any physical damage or signs of malfunction.
   • Test the device's functionality using a multimeter or other suitable method.
2. Verify Communication:
   • Ensure that the communication between the VFD and the safety device is functioning properly.
   • Check the communication cable for any damage or loose connections.
3. Inspect Wiring:
   • Verify that the wiring between the VFD and the safety device is correct and secure.
   • Check for any short circuits or open circuits.
4. Review VFD Settings:
   • Ensure that the VFD's safety settings are configured correctly for the specific safety device being used.
   • Check for any conflicts or errors in the safety settings.
5. Test Safety Function:
   • Manually activate the safety device and verify that the VFD responds as expected.