DOL Starter Wiring Diagram

The given figure shows the DOL starter wiring diagram and this shows that the DOL Starter has two buttons which are used for the starting and stopping the motor working and thus control the contacts.

DOL Starter Wiring Diagram

This consist of circuit breaker, contactor and overload relay for the protection purpose. So the motor s started by pushing the green button and voltage appears on the motor , since it contains 4 pole type contactor and contains three normally open contacts which connects the motor to the supply and the fourth one is used to push the contactor coil as the start button gets released which is turn leads to the de-energization of the coil in case of occurrence of the fault and hence the starts gets disconnected from the main supply.

DOL Starter

For cases to avoid damage to the motor, various techniques are used to reduce the starting current with the use of a motor starter, these techniques vary on different factors and also protect the motor from overcurrent and overloading. DOL starter is one of the techniques used and in this article, we are going to discuss DOL starters and the starting of induction motors. We will cover what is starting induction motors and their functions, what are DOL starters, their application, terminologies, theory, construction, working, and the difference between DOL and star-delta starters.

Table of Content

  • DOL Starter
  • Important Terminologies
  • Construction and Working
  • 3 Phase Motor Starter with Overload Protection
  • DOL Starter Wiring Diagram
  • Advantages , Disadvantages and Applications

Similar Reads

What is a DOL Starter?

Direct on-line is the simplest form of motor starter. This method involves directly switching the polyphase stator onto the supply mains. This is also called an “across-the-line starter.” Depending upon size and design, the motor takes a low-power factor starting current of 5 to 7 times its full-load current. Such large currents of short duration don’t harm the rugged squirrel cage motor, but the high currents may cause objectionable voltage drops in the power supply lines feeding the induction....

Important Terminologies

Contactor: The magnetic contractors act as electromagnetically operated switches. It uses electromagnetic energy to close switches, which consist of a coil placed on the iron core. Overload Relay: Overload relay prevents motor damage. It monitors the current in the motor and breaks the circuit when a fault is detected. Start Button: It helps to supply power to the motor to start the motor. Stop Button: It helps to cut down the electrical supply to the motor. Auxiliary Contacts: Auxiliary contacts are electromechanical devices used in switching equipment such as contactors, circuit breakers, switches, and relays. These secondary switching devices are physically connected to the main switching equipment and work at the same time....

Construction and Working

Here, will have Construction, Working and Connection of DOL Starter given below :...

3 Phase Motor Starter with Overload Protection

In order to fulfill the load requirements , the current exceeds its limit that means current draws more and the load requirement also goes higher which is called as overloading. The 3 Phase Motor Starter with Overload Protection is the protection or security performed when the excessive current or load is drawn by the motor which leads to heating also and effects the equipment....

DOL Starter Wiring Diagram

The given figure shows the DOL starter wiring diagram and this shows that the DOL Starter has two buttons which are used for the starting and stopping the motor working and thus control the contacts....

Advantages , Disadvantages and Applications

The Advantages , Disadvantages and Applications of DOL Starter are mentioned below:...

Conclusion

DOL Starter are suitable for various applications such as in small motors because of the dip in voltage. It connects the motor to line voltages directly and designed for switching and protection of induction motors , we can also say that it is method to start a 3- phase induction motor. It is cost effective for the smooth operation of the motor and reduces the stress from the electrical equipment. Thus it protects the motor from being damage because of high current or overload applications and so they are operated manually....

FAQs on DOL Starter

Why is R-DOL Starter used?...