Cause : Pre-charging contactor simultaneity monitoring time exceeded comes when a feedback signal for the pre-charging contactor (ALM, SLM, BLM diode) or the line contactor (BLM thyristor) interconnected and the simultaneity monitoring (p0255[4, 6]) activated.

After opening or closing a contactor of the parallel connection, after a monitoring time has elapsed, not all of the contactors have assumed the same state.

- check the monitoring time setting (p0255[4, 6]).
- check the contactor wiring and activation.
- if required, replace the contactor.