External Trip (EXT)

What does E12. mean?

This fault is triggered by an external error signal received on the multi-function input terminal configured for 'External Trip' (EXT). It means a peripheral system connected to the inverter has detected a fault condition and signaled the inverter to shut down for safety or process control. The inverter displays this code but does not clear the trip status until reset.

• External safety device (e.g., E-stop, limit switch, motor thermal overload relay) connected to a multi-function input (e.g., S3, S4) configured as 'External Trip' has opened its contacts.
• Broken wire or loose connection in the control circuit connected to the 'External Trip' input terminal (e.g., S3 to SC).
• Faulty multi-function input terminal or associated internal circuitry on the inverter's control board.
• Incorrect configuration of the multi-function input parameter (e.g., P7-01 set to 07) for external trip logic (NO/NC).
• Transient voltage spike or noise causing a momentary false trip signal on the external trip input.

Click steps to track your progress.

1. 1

   Identify which multi-function input terminal (e.g., S3, S4) is configured as 'External Trip' (e.g., P7-01 set to 07).

2. 2

   Measure the voltage between the identified input terminal and the common terminal (SC) to verify the state of the external trip signal (e.g., 24VDC when active, 0VDC when tripped).

3. 3

   Inspect all external safety devices (e.g., limit switches, E-stop buttons, thermal overloads) in the control circuit for their trip status and reset them if necessary.

4. 4

   Trace the wiring from the external trip input terminal back to the sensing device, checking for continuity, loose connections, or damaged insulation.

5. 5

   Verify the multi-function input logic (e.g., P7-08 source/sink setting or internal NO/NC selection) matches the external device's contact type.