Case 2: PLC access to line contactor

The line contactor K3 is closed or opened by the supply and regenerative module via the coupling relay K1 according to technical requirements. Additionally, the PLC can open the line contactor K3 via the coupling relay K4, e.g. in an emergency.

Precharge inhibit is not active. The contacts X13:PCE and X13:GND are jumpered at the supply and regenerative module.

K1	Coupling relay for line contactor K3
K3	Line contactor
K4	PLC coupling relay for line contactor K3