K1-Trip (Main contactor K1 stuck)

What does 111 mean?

This fault indicates that the main contactor K1 is stuck, meaning it has failed to open or close as commanded (KPS-600). This can prevent the system from safely powering up or shutting down, and can lead to continuous power supply to the drive even when disengaged, posing a safety risk.

1. 1

   Verify the coil voltage for main contactor K1 during commanded open and close states.

2. 2

   Manually actuate K1 (if safe to do so with power off) and verify proper mechanical movement.

3. 3

   Measure the continuity of the main power contacts of K1 when commanded open and closed.

4. 4

   Inspect K1 contacts for signs of welding, pitting, or other physical damage.