External fault

What does EPF mean?

This fault is triggered by an external condition or device connected to a logic input configured for external fault detection. This input is typically connected to a safety circuit, thermal switch, or another protective device. If the external fault condition persists, the drive will remain in a fault state, preventing operation until the external issue is cleared, ensuring machine and personnel safety.

• A logic input (e.g., DI1) configured as an external fault opens or loses its signal.
• Safety circuit device (e.g., E-stop, light curtain) connected to external fault input is tripped.
• Thermal switch on the motor or cabinet opens due to over-temperature.
• Auxiliary contact of a motor contactor or circuit breaker opens unexpectedly.
• Wiring fault (broken wire) in the external fault circuit connected to the drive's digital input (e.g., DI1).

Click steps to track your progress.

1. 1

   1. Identify the specific digital input terminal (e.g., DI1, DI2) configured for external fault detection (P2-11).

2. 2

   2. Measure the voltage at the identified digital input terminal to confirm its state (e.g., 24VDC for active, 0VDC for fault).

3. 3

   3. Trace the external fault signal back to its source (e.g., E-stop button, thermal switch) and confirm its status.

4. 4

   4. Check for continuity in the wiring from the external fault source to the drive's digital input terminal.

5. 5

   5. Verify that the external fault device (e.g., thermal relay) is not physically tripped or damaged.