Forward-Reverse Starter Control circuit

In this post, working of forward-reverse Starter Control circuit explained. The forward reverse starter is applicable where frequent forward and reverse of induction motor is necessary. The control circuit of forward-reverse starter consists of two contactors, one for forward direction and other for reverse direction. The complete working of Forward-Reverse Starter is explained in following steps.

Working of Forward-Reverse Starter

Forward direction

Push ON button (Forward).
The forward contactor coil gets supply through phase R – OFF push button – R2 – Forward contactor coil – F ON push button – phase Y.
The forward contactor coil energized and three phase induction motor runs in the forward direction.
As soon as forward contactor energized, its auxiliary contact F1 normally closed and F2 becomes normally open.

Auxiliary contact F1: NC from NO

Auxiliary contact F2: NO from NC

Now the forward contactor gets supply through phase R – OFF push button – R2 – Forward contactor coil – F1 – phase Y.

Reverse direction

Push ON button (Reverse).
The reverse contactor coil gets supply through phase R – OFF push button – F2 – Reverse contactor coil – R ON push button – phase Y.
The reverse contactor coil energized and three phase induction motor runs in the reverse direction.
As soon as reverse contactor energized, its auxiliary contact R1 becomes normally closed and R2 becomes normally open.

Auxiliary contact R1: NC from NO

Auxiliary contact R2: NO from NC

Now the reverse contactor gets supply through phase R – OFF push button – F2 – Reverse contactor coil – R1 – phase Y.