Individual circuit without quick-discharge resistors

Individual circuit with quick-discharge resistors

R1 discharge resistors fitted in capacitor

R1 discharge resistors fitted to contactor

Two-way pushbutton

For connection of further control circuit devices: → section Control circuit devices for star-delta starting

In the case of actuation by means of power factor correction relay, check that this has sufficient power to actuate the contactor coil. Interpose a contactor relay if necessary.

Pushbutton I energizes contactor Q11. Q11 energizes and maintains itself via its own auxiliary contact 14–13 and pushbutton 0. Capacitor C1 is now energized. Discharge resistors R1 are not operative when contactor Q11 is energized. Actuation of pushbutton 0 effects de-energization. Normally closed contacts Q11/21–22 then switch discharge resistors R1 to capacitor C1.