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. Despite this direct connection no harm is done to the motor.
How To Wire A Contactor And Overload Direct Online Starter By Earthbondhon
Dol motor connection diagram. The 3 phase dol starter wiring diagram is shown below. In the above three phase dol starter wiring diagram. The electromagnet consists of a coil of wire placed on an iron core. The contactor is used for starting and stopping the motor where the green and red buttons are connected. The dol starter is made of a circuit breaker or mccb or fuse an overload relay and contactor or coil. I dol starter wiring connection with start and stop buttons are shown in the above figure 1.
Magnetic contactors are electromagnetically operated switches that provide a safe and convenient means for connecting and interrupting branch circuits. Magnetic motor controllers use electromagnetic energy for closing switches. All connection i shown with complete guide. The dol starter joints the 3 phase main wiring with the induction motor namely l1 l2 and l3 when the start switch is pressed. The circuit breaker is used for protection against short circuits while the overload relay protects the motor from overloading. The normally closed connection of this relay is connected to stop switch as well as the mutual connection of start or stop switch.
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. What is dol starter. 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.
Gallery of Dol Motor Connection Diagram
