Direct Online Starter Control Circuit Diagram

A direct online starter consits of two buttons a green button for starting and a red for stopping purpose of the motor.

Direct online starter control circuit diagram. Green and red or start and stop buttons control the contacts. The maximum size of a motor allowed on a direct on line starter may be limited by the supply utility for this reason. A2 14 18. This is why such a starter is used with induction motors rated below 5 hp.

Direct online starter dol. L3 of the main contactor with the induction motor the working of dol starter is done in two different stage namely dol starter control circuit and dol starter power circuit. 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. All other control and power connections have to be made by the installer.

It consists a coil operated contactor c controlled by start and stop push button as shown in the connection diagram below. 13 17 with a flying lead to be connected to overload terminal 95. The dol starter comprises of an mccb or circuit breaker contactor and an overload relay for protection. The direct on line starter method figure is shown below.

1 the following links are pre fitted to the starter. The l1 contactor is connected from normally open no to r phase using mccb. 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. The wiring of direct on line control circuit starter is following.

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. 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. The motor is connected through a starter across the full supply voltage. Direct on line starter direct on line starter method is a common method of starting of cage induction motor.

The connection of contactor can be done among relay coil supply voltage as well as thermal overload. These two buttons i e. Direct on line motor starter dol is suitable for. Dol starter control diagram three phase.