Working of Forward-Reverse Starter

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.

Forward-Reverse Starter Control circuit diagram

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