External Fault (Input Terminal S4)

What does EF4 mean?

An external fault has been triggered at multi-function input terminal S4. This signifies that an external device connected to S4 has activated an alarm function, or there's an issue with the wiring or configuration of terminal S4. This fault will typically cause the drive to stop operation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify that the multi-function input parameter for S4 (e.g., H1-04) is correctly set for external fault detection and that no unused terminals are inadvertently configured.