Overcurrent (Control Power Related)

What does E.OC1 mean?

This error indication occurs if power is supplied only to the R1 and S1 <L11 and L21> terminals (control power) and a start signal is entered, without the main circuit power (R, S, T) <L1, L2, L3> being present. This indicates an incorrect power supply sequence or missing main power when attempting to operate the inverter.

1. 1

   Verify that main circuit power (R, S, T <L1, L2, L3>) is supplied to the inverter before applying a start signal.

2. 2

   Ensure jumpers across R-R1 and S-S1 <L1-L11 and L2-L21> are removed if using a separate control power supply.

3. 3

   Confirm that main power is applied to R, S, T terminals *before* attempting to supply control power to R1, S1 or issuing a run command.