A Direct on Line (DOL) motor starter is a type of motor starter that is used to control the power supply to a motor. It is a simple and cost-effective way to start and stop a motor, making it an ideal choice for many different applications.
Introduction to DOL Motor Starter Wiring Diagram
Before we discuss the wiring diagram of a DOL motor starter, let’s first understand what a motor starter is and what its functions are.
A motor starter is a device that is used to start and stop an electric motor. It provides protection to the motor by preventing it from drawing excessive current, and it also protects the circuit from overloading. The motor starter consists of a contactor and an overload relay, which are housed in a single enclosure.
A DOL motor starter is the most basic type of motor starter, and it is commonly used for single-phase motors up to 5 horsepower and three-phase motors up to 15 horsepower. The wiring diagram of a DOL motor starter is quite simple and easy to understand.
Wiring Diagram of a DOL Motor Starter
The wiring diagram of a DOL motor starter consists of three major components: the power supply, the contactor, and the overload relay. Let’s discuss each component in detail.
Power Supply
The power supply is the first component of the wiring diagram. It supplies the voltage to the motor starter. In a three-phase system, the power supply consists of three wires – L1, L2, and L3. In a single-phase system, the power supply consists of two wires – live and neutral.
Contactors
The contactor is the second component of the wiring diagram. It is an electromechanical switch that is used to connect and disconnect the power supply to the motor. The contactor has three main terminals – L1, L2, and L3. It also has a control circuit, which is used to switch the contactor on and off. The control circuit consists of a start button and a stop button.
Overload Relay
The overload relay is the third component of the wiring diagram. It is a protection device that is used to protect the motor from overloading. The overload relay is connected in series with the motor, and it detects the current flowing through the motor. If the current exceeds the set value, the overload relay trips and disconnects the power supply from the motor.
FAQ about DOL Motor Starter Wiring Diagram
| Question | Answer |
|---|---|
| What is a DOL motor starter? | A DOL motor starter is a type of motor starter that is used to start and stop a motor. It is a simple and cost-effective way to control the power supply to a motor. |
| What are the components of a DOL motor starter wiring diagram? | The components of a DOL motor starter wiring diagram are the power supply, contactor, and overload relay. |
| What is the function of a contactor in a DOL motor starter? | The function of a contactor in a DOL motor starter is to connect and disconnect the power supply to the motor. |
| What is the function of an overload relay in a DOL motor starter? | The function of an overload relay in a DOL motor starter is to protect the motor from overloading. If the current flowing through the motor exceeds the set value, the overload relay trips and disconnects the power supply from the motor. |
Conclusion
A DOL motor starter is a simple and cost-effective way to control the power supply to a motor. The wiring diagram of a DOL motor starter consists of three major components – the power supply, contactor, and overload relay. Understanding the wiring diagram is essential for proper installation and maintenance of the motor starter. We hope this article has provided you with a clear understanding of the wiring diagram of a DOL motor starter.
