External Fault

What does EPF mean?

An external fault has been triggered, typically by a digital input signal from an external safety device or process interlock. This indicates a condition outside the drive's internal control that requires attention, such as an emergency stop, a limit switch activation, or another process safety interlock. The drive will stop operation to ensure safety.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Ensure the external safety circuit or interlock is in a safe and operational state, and reset it at its source if needed.

2. 4

   Verify the logic of the external fault input (e.g., normally open/closed) matches the drive's configuration.