Semiconductor soft starter 3RW3 3RW31 L1 (L+) N (L-) N (L-) L1 (L+) ON/OFF Ramp 2 K2 OFF F2 F1 F3 3RW31 3RT 3RT K2 K1 Ramp 1 Ramp 2 ON ON K1 K2 K1 K2 3RU/3RB10 F2 F3 3RU/3RB10 K1 K2 M 3 ~ . /.P Fig. 8-25: Wiring diagrams, 3RW31 Automatic operation Direct starting of the soft starter is possible as soon as the auxiliary voltage is applied to the terminals A1 and A2. To this end, a jumper is needed between the auxiliary voltage contact A1 and the cycling contact IN. Attention must be paid to the fact that:
an on delay of up to 4 s can occur depending on the size soft coasting is no longer possible after deactivation of the auxiliary volt- age Cycling via PLC The soft starter 3RW3 can be cycled via a programmable logic controller. The wiring is the same as for cycling via a switch. Important Always pay attention to the correct connection of A1 and A2! Although reverse voltages cannot destroy the unit, they may lead to malfunctions. Rev. 08/99 8-37 A2 A1 1 2 A2 A1 1 2