External terminal

What does F-26 mean?

An external fault signal has been read in via a programmable input terminal. This indicates a problem or alarm originating from an external device or system connected to the inverter. The inverter's response to this signal is configurable, but it signals an issue outside its direct control.

• External E-stop circuit (e.g., X10/S1 terminal) incorrectly wired or activated, causing a normally closed contact to open.
• Programmable input terminal (e.g., DI3, DI4) configured as an external fault input (Parameter P2-11 = 2) receiving a false trip signal from a faulty sensor.
• Auxiliary contact of an upstream circuit breaker or motor contactor configured for fault feedback has opened due to an overload condition.
• Noise or transient voltage on the control wiring to the programmable input terminal, causing an intermittent fault signal.
• External safety relay contact (e.g., for safety gate) wired to a fault input has opened or failed.

Click steps to track your progress.

1. 1

   Identify the specific programmable input terminal (e.g., X10/S1, DI3) configured as an external fault input by checking Parameters P2-11 through P2-16 (Digital Input Functions).

2. 2

   Measure the voltage across the identified input terminal and its common (e.g., X10/COM) to verify the state of the external signal (e.g., 24VDC for active, 0VDC for inactive).

3. 3

   Trace the wiring from the identified input terminal back to the external device (e.g., E-stop button, thermal overload relay) to locate the source of the signal.

4. 4

   Inspect the external device's status and connections. For a safety circuit, perform a continuity test across the device's auxiliary contacts.

5. 5

   Temporarily disconnect the external device's signal wire from the inverter's input terminal (if safe to do so) and observe if the fault clears to isolate the issue to the external circuit.

6. 6

   If the external circuit is confirmed faulty, repair or replace the component (e.g., E-stop button, sensor, wiring) causing the signal.