External Fault

What does EF8 mean?

This fault indicates that an external protective device or interlock connected to a specific digital input (corresponding to EF8) has been activated, triggering a trip in the inverter. The specific cause depends on the external device wired to that input. This is a safety feature to stop the drive based on external process conditions, preventing damage to the system or injury.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the wiring between the external device and the inverter's digital input for continuity or loose connections.

2. 4

   Verify the inverter's digital input parameter settings (e.g., normally open/normally closed logic) for the external fault input.

3. 5

   Reset the external device if it's a manual reset type, then attempt to restart the inverter.