DOL Stater ON Lamp, OFF Lamp & TRIP Lamp Wiring Connection

Direct online Line Stater or DOL Motor Starter

• The Direct On Line starter is the simplest form of motor starter. The direct online starter is a basic and simple starter used for starting the induction motor.
• In DOL Starter the stator winding of the induction motor is directly connected to  three phase supply voltage. Thus, the full line voltage is applied to motor terminal.
• The DOL motor starter is suitable for starting small rating motors.  because the motor draws about 6 to 8 times of its rated current at starting time when  the full rated voltage is applied to stator terminals of the motor.

All Topic Cover 

DOL Stater Wiring Diagram
DOL Stater wiring Connection
DOL Stater ON Lamp Connection
DOL Stater OFF Lamp Connection
DOL Stater TRIP Lamp Connection
Thermal Overload Relay Connection

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Advantages of DOL Starter 

1. Simple, most economical, easy to understand starter.
2. More comfortable to design, operate and control.
3. Provides nearly full starting torque at starting.
4. Easy to troubleshoot.
5. DOL starter directly connects the supply to the delta winding of the motor so there is no complexity of the  circuit diagram

Disadvantages of DOL Starter

1. High starting current (5-8 times of full load current). The higher rating of switch gears are required to be installed.
2. DOL Starter causes a significant dip in voltage hence suitable only for small motors. However, it can be used for starting a large rating motor up to 90 KW if the power transformer capacity permits. 
3. DOL Starter reduces the lifespan of the machine because of higher thermal and mechanical stresses on the system.

Applications of DOL Starter

• DOL starters are used to start the small rating motor like water pumps, compressors, conveyors etc. The compressor motor starts at no load therefore the DOL starting is suitable for compressor motor. The Squirrel cage induction motor coupled through fluid coupling can also be started with DOL starter.

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Created By :- Deepakkumar Yadav