P1 240V AC Discon

What does 11120 mean?

The 240V AC disconnect switch on port 1 is open when the precharge controller is in the ready state, but the molded case switch (MCS) is not closed. This prevents the drive from starting or operating.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Inspect the wiring connections from the disconnect switch to the precharge controller for any breaks, loose terminals, or incorrect wiring.

2. 4

   Ensure the precharge controller is correctly detecting the state of the MCS and the disconnect switch.

3. 5

   Test the disconnect switch for proper mechanical operation, ensuring it makes full contact when closed.