How dol starter control diagram works when we press the start button to start the motor the relay gets the phase and circuit completed thus coil energizes and contactors produce magnetic field the main contactor closes and motor gets the supply and the motor startswhen we press the stop button the circuit will interrupt and the motor stop. A dol motor starter contains protection devices and in some cases condition monitoring.
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Dol motor starter 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 thermal overload is supplied as a separate item. A wiring diagram of a dol starter is. In the above three phase dol starter wiring diagram. The direct on line motor starter dol consist a mccb or circuit breaker contactor and an overload relay for protection. 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.
Electromagnetic contactor which can be opened by the thermal overload relay under fault conditions. 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. Between the mains supply terminals and motor terminals the dol starter main terminals are connected and with the two terminals of the three phase power supply as described in figure 1 the control circuit is energized. The simplest form of motor starter for the induction motor is the direct on line starter. In the below dol starter wiring diagram i shown a molded case circuit breaker a magnetic contactor normally open push button normally close push button switch thermal overload relay motor trip indicator and 3 phase motor. A dol starter is a direct on line motor starter.
I dol starter wiring connection with start and stop buttons are shown in the above figure 1. It comprises an enclosure in steel or plastic a contactor start contact link wires and stop start buttons. The dol starter is made of a circuit breaker or mccb or fuse an overload relay and contactor or coil. The contactor is used for starting and stopping the motor where the green and red buttons are connected. Direct on line dol motor starter description the direct on line motor starter dol is designed to switch a single or three phase induction motor at rated voltage. All controlling of starter are controlled by this circuit.
Dol starter control circuit diagram consist components like main power contactor start button stop push button and overload relay is connected in series this circuit is called control circuit of dol motor starter. The circuit breaker is used for protection against short circuits while the overload relay protects the motor from overloading. All connection i shown with complete guide. Despite this direct connection no harm is done to the motor.
Gallery of Dol Motor Starter Diagram
