External Fault (Terminal S1)

What does EF1 mean?

This fault indicates that an external device triggered a fault via the Multi-Function Digital Input (MFDI) terminal S1, or there is incorrect wiring to S1, or the terminal is incorrectly configured for an external fault despite not being in use. This causes the drive to halt operation based on an external signal, potentially stopping connected machinery.

• External safety device (e.g., E-stop button, limit switch) wired to terminal S1 has opened, triggering the fault.
• Loose or corroded wiring connection at terminal S1, causing intermittent contact loss or an open circuit.
• Multi-Function Digital Input S1 (e.g., P2-01) configured as a Normally Open (NO) input, and the input device is in an open state.
• External device wired to S1 is faulty, continuously sending an open signal despite normal operating conditions.
• Excessive electrical noise or inductive coupling onto the S1 input line, causing false triggering of the fault.

Click steps to track your progress.

1. 1

   Inspect the wiring connection to terminal S1 and ensure it is secure. Check wire continuity from S1 to the external device with a multimeter.

2. 2

   Verify the state of the external device (e.g., limit switch, E-stop) connected to S1. Manually actuate and observe its contact status.

3. 3

   Check the drive parameter (e.g., P2-01) assigned to S1 to confirm it is configured correctly (e.g., NO or NC, external fault function).

4. 4

   Measure the voltage at terminal S1 relative to SC (common) using a multimeter. Compare with expected logic level (e.g., 24VDC for active, 0VDC for inactive).

5. 5

   Temporarily bypass the external device by jumpering S1 to SC with a short wire. If the fault clears, the external device or its wiring is the cause.