Cause : External Fault (input terminal S3) comes when external fault at multi-function input terminal S3. When an external device tripped an alarm function or wiring is incorrect or multi-function contact input setting is incorrect.

A Yaskawa V1000 drive displaying an EF3 fault code indicates an external fault detected at the multi-function input terminal S3. This means an external device connected to the drive has triggered an alarm or there's an issue with the wiring or configuration related to that terminal.

1. Remove the cause of the external fault and reset the fault.
2. Properly connect the signal lines to the terminals assigned for external fault detection.
3. Reconnect the signal line.
4. Change the terminal settings.