Connection examples, DM4 - Bypass connection

Bypass connection [t-head1-pg]

After the run-up (full mains voltage reached) the DM4 soft starter actuates the bypass contactor. Thus, the motor is directly connected with the mains.

Advantage:

The soft starter’s heat dissipation is reduced to the no-load dissipation.

The limit values of radio interference class "B“ are adhered to.

The bypass contactor is now switched to a no-load state and can therefore be AC-1 rated.

If an immediate de-energization is required in the event of an Emergency-Stop, then the bypass contactor must also switch the motor load. In this case it must be AC-3 rated.

Control section [t-head3]

Emergency-Stop

S1: Off

S2: On

Position 1 Enable

Position 2 Soft start/Soft stop

DM4-340 with bypass [t-head3]

Position 1 Control voltage through Q1 or F1 or through Q2

Position 2 See Control section

Position 3 Motor current indication