DOL Starter Wiring Diagram:

DOL Starter Wiring Diagram:

The wiring of 3 phase and single phase slightly differs from each other. Following are the wiring for 3 phase and single phase dol starter:

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MCCB or Circuit Breaker: The R, Y and B phase are connected through MCCB to the contactors.

Magnetic Contactor: The contactor has 3 types of contacts:

1) Main Contacts: The contactor has 3 main (NO) contacts known as L1, L2 and L3.

L1 is connected to the R phase through MCCB

L2 is connected to the Y phase through MCCB

L3 is connected to the B phase through MCCB

Point 1 is connected to R-phase while point-2 is connected to overload relay T1 point.

Point 3 is connected to Y-phase while point-4 is connected to overload relay T2 point.

Point 5 is connected to B-phase while point-6 is connected to overload relay T3 point.

2) Auxiliary NO Contacts: the auxiliary NO contact 53 and 54 closes when the coil energizes.

It is connected through the green and red push button.

The point-53 is connected to the point-96 start button

The point-54 is connected through the stop button.

3) Auxiliary NC Contacts: the NC contact 95 and 96 is normally closed contacts of overload relay and it opens when the current exceeds a certain limit.

The point-96 is connected to the stop button.

Relay Coil: The relay coil points A1 and A2 are connected to the voltage supply through OLR, start button and stop button.

The Point A1 is connected to R-phase from point 1.

Point A2 is connected to the NC terminal of overload relay point 95.

Overload Relay: The overload relay has normally connected terminals T1, T2 and T3 that supply power to the motor.