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.

Complete Troubleshooting Guide

1. 1

   Identify the specific external device or condition (e.g., E-stop button, safety guard switch, thermal switch) that activated the external fault input.

2. 2

   Check the wiring and functionality of the digital input assigned to the external fault on the drive.

3. 3

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

4. 4

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