Control power only with start signal

What does E.OC1 mean?

This error occurs if a start signal is entered when only the control circuit power (connected to R1, S1 <L11, L21> terminals) is supplied to the inverter, and the main circuit power (R, S, T <L1, L2, L3> terminals) is not connected. This improper power sequencing can potentially damage the inverter.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   For FR-A520-5.5K to 55K and FR-A540-5.5K to 55K models, confirm that the control power supply cables are connected to the *upper* terminals R1, S1 (<L11, L21>), and not the lower terminals.