Direct Online Motor Control Circuit Diagram. This is why such a starter is used with induction motors rated below 5 hp. The wiring of direct on line control circuit starter is following.
Dol starter control circuit diagram consist components like main power contactor start button stop push button and overload relay is connected in series this circuit is called control circuit of dol motor starte r. 3 easy to build speed controller circuits for dc motors are presented here one using mosfet irf540 second using ic 555 and the third concept with ic 556 featuring torque processing. The maximum size of a motor allowed on a direct on line starter may be limited by the supply utility for this reason.
The dol starter comprises an mccb or circuit breaker contactor and an overload relay for protection.
A direct online starter consists of two buttons a green button for starting and a red for stopping purpose of the motor. The direct online or dol starter employs full voltage or across the line starting technique where the motor is directly connected to full voltage through mccb or circuit breaker and relays for overload protection. A direct on line starter can be used if the high inrush current of the motor does not cause excessive voltage drop in the supply circuit. A circuit which enables a user to linearly control the speed of a connected motor by rotating an attached potentiometer is called a motor speed controller circuit.
