3 Phase Direct Online Motor Starter Circuit Diagram

In the 3 phase motor forward reverse starter wiring diagram.

3 phase direct online motor starter circuit diagram. The maximum size of a motor allowed on a direct on line starter may be limited by the supply utility for this reason. A dol starter or direct on line starter or across the line starter is a method of starting of a 3 phase induction motor 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. Direct on line motor starter dol is suitable for. 1 the following links are pre fitted to the starter.

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 dol starter basically consists of two main protection parts. This is why such a starter is used with induction motors rated below 5 hp. And the normally open and normally close push button shown.

The coil of the contactor is 380 vac. Three phase motor connection schematic power and control wiring installation diagrams. All other control and power connections have to be made by the installer. Direct on line starter is the simplest kind of starter that connects the motor directly to the power supply through a three phase contactor.

13 17 with a flying lead to be connected to overload terminal 95. The r y b is the three phase 380 volts supply. The contactor connection with thermal overload relay and the motor connection with overload relay is shown. In short this the complete guide of forward reverse starter.

Despite this direct connection no harm is done to the motor. In the above dol starter diagram. Three phase motor connection star delta without timer power control diagrams. I shown the 3 pole mccb circuit breaker 2 magnetic contactor normally open normally close push button switch thermal overload relay 3 phase 4 wire system supply 3 phase motor with connection trip indicator light etc.

The direct on line starter usually consists of a contactor circuit breaker and an overload relay for protection against any damage. A2 14 18. 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. What is dol starter.