Run Command Fault

What does EF mean?

This fault indicates an issue with the run command or a conflict in the command source (e.g., local/remote, digital input, serial). It prevents the inverter from starting or continuing operation. This can happen if the run command is unexpectedly lost, or if there's a discrepancy in how the inverter is commanded to run.

• Conflicting run commands from multiple sources (e.g., digital input and serial communication) due to P0-01 (Run Source Selection) parameter misconfiguration.
• Digital input terminal (e.g., S1, S2) assigned for run command is not activated or has an open circuit.
• External safety interlock or E-stop circuit connected to a digital input preventing run command.
• Local/Remote mode switch on the inverter is in an unexpected position, overriding the intended run command source.
• Serial communication (MODBUS, network) run command not being sent or sent incorrectly.

Click steps to track your progress.

1. 1

   Verify parameter P0-01 (Run Source Selection) is set correctly for the intended run command source (e.g., 0 for Keypad, 1 for Digital Inputs, 2 for Serial).

2. 2

   Measure voltage at the assigned digital input terminal (e.g., S1-SC) when a run command is expected (e.g., 24VDC for ON).

3. 3

   Check the state of external safety interlocks or E-stop buttons connected to the inverter's control terminals.

4. 4

   If using serial communication, confirm the run command bit (e.g., Bit 0 of register 0001h for MODBUS) is being written correctly.

5. 5

   Cycle power to the inverter and re-attempt the run command from a single, verified source.