Direct Online Motor Starter Circuit Diagram

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Direct online motor starter circuit diagram. The coil of the contactor is 380 vac. Generally the direct online starter working can be done in two different stages namely dol starter control circuit and dol starter power circuit. Direct on line starter direct on line starter method is a common method of starting of cage induction motor. 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.

In the above dol starter diagram. The direct on line starter method figure is shown below. This is why such a starter is used with induction motors rated below 5 hp. Direct on line starter is the simplest kind of starter that connects the motor directly to the power supply through a three phase contactor.

A wiring diagram of a dol starter is. And the normally open and normally close push button shown. The dol starter basically consists of two main protection parts. Despite this direct connection no harm is done to the motor.

In this article we will discuss dol starter direct online starter working principle and construction dol starter diagram control diagram power circuit and wiring single 3 phase starter direct on line is the simplest and cheapest method used for starting three phase motor. Wiring of the direct on line dol motor starter 1 three phase supply 230volt coil see wiring diagram. The maximum size of a motor allowed on a direct on line starter may be limited by the supply utility for this reason. The r y b is the three phase 380 volts supply.

The motor is connected through a starter across the full supply voltage. In this post we are going to know the details of each part of dol starter diagram all parts of the dol starter power circuit diagram and control circuit diagram are explained direct online starter or dol starter is very useful and commonly used ac starter dol starters are mainly used with up to 5 h p motors. Direct on line motor starter dol is suitable for. The dol starter joints the 3 phase main wiring with the induction motor namely l1 l2 and l3 when the start switch is pressed.

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. In dol starter an induction motor is connected directly across its 3 phase supply and the dol starter applies the full line voltage to the motor terminals. A dol motor starter contains protection devices and in some cases condition monitoring. The 3 phase dol starter wiring diagram is shown below.

It consists a coil operated contactor c controlled by start and stop push button as shown in the connection diagram below. All other control and power connections have to be made by the installer. The contactor connection with thermal overload relay and the motor connection with overload relay is shown.