External Fault (Terminal S2)

What does EF2 mean?

This fault indicates that an external device triggered a fault via the Multi-Function Digital Input (MFDI) terminal S2, or there is incorrect wiring to S2, 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., safety relay output, pressure switch) wired to terminal S2 has changed state, triggering the fault.
• Damaged insulation on the cable connected to S2, causing a short circuit to ground or another potential.
• Multi-Function Digital Input S2 (e.g., P2-02) configured incorrectly (e.g., set as a different function than intended, or wrong contact type).
• Auxiliary contact of a contactor or circuit breaker connected to S2 is stuck open or closed, sending an erroneous signal.
• Power supply issue to the external sensor or device connected to S2, causing it to report a fault state.

Click steps to track your progress.

1. 1

   Visually inspect the wiring to terminal S2 for any damage, loose connections, or incorrect termination.

2. 2

   Check the state of the external device connected to S2. For example, if it's a pressure switch, verify the pressure reading and output status.

3. 3

   Confirm the drive parameter (e.g., P2-02) assigned to S2 matches the intended function and contact type (Normally Open/Closed).

4. 4

   Measure the voltage between S2 and SC (common) with a multimeter to verify the input signal level.

5. 5

   Temporarily disconnect the external device from S2 and jumper S2 to SC. If the fault clears, the external device or its wiring is faulty.

6. 6

   If using a sensor, verify its independent power supply (e.g., 24VDC from terminal +24) and functionality.