Different starting methods are employed for starting induction motors because induction motor draws more starting current during starting. Direct on line starter direct on line starter method is a common method of starting of cage induction motor.
Direct Online Starter Dol Starter Working Principle Control
Direct online motor starter diagram. A dol starter or direct on line starter or across the line starter is a method of starting of a 3 phase induction motorin 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 starter. The 3 phase dol starter wiring diagram is shown below. The direct on line starter method figure is shown below. What is dol starter. Generally the direct online starter working can be done in two different stages namely dol starter control circuit and dol starter power circuit.
Three phase and single phase. A dol starter is a direct on line motor starter. To prevent damage to the windings due to the high starting current flow we employ different types of starters. Direct on line starter is the simplest kind of starter that connects the motor directly to the power supply through a three phase contactor. The direct on line starter usually consists of a contactor circuit breaker and an overload relay for protection against any damage. It consists a coil operated contactor c controlled by start and stop push button as shown in the connection diagram below.
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. In this post we are going to know the details of each part of dol starter diagramall parts of the dol starter power circuit diagram and control circuit diagram are explaineddirect online starter or dol starter is very useful and commonly used ac starterdol starters are mainly used with up to 5 hp motors. This is why such a starter is used with induction motors rated below 5 hp. Despite this direct connection no harm is done to the motor. Schematic and circuit diagram.
Sometimes known as an across the line starter this type of motor controller is used as a simple starter for larger electric motors providing. The motor is connected through a starter across the full supply voltage. 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. The dol starter joints the 3 phase main wiring with the induction motor namely l1 l2 and l3 when the start switch is pressed. Three phase motor control and design power circuit and installation. Direct online motor starter square d.
Gallery of Direct Online Motor Starter Diagram
