What You Need to Know about Dol Starter Circuit Wiring Diagram

The DOL (Direct On Line) starter is a common motor starter used in many industrial applications. It is typically used to start large motors and is one of the simplest ways to control the power supplied to the motor. In this article, we will discuss the wiring diagram of the DOL motor starter and the features that you need to be aware of when wiring a DOL starter circuit.

A wiring diagram is essential for understanding the proper connections that need to be made when wiring any electrical device. It can also help troubleshoot potential problems. For example, if you have a DOL starter installed and it does not start properly, looking at the wiring diagram can help pinpoint which parts of the connection have been wired incorrectly.

Components of a DOL Starter Circuit

DOL starter circuits typically have three components: the contactor, overload relay, and thermal overload. The contactor is the switch in the circuit that activates the current flow when the motor needs to start. The overload relay provides protection mechanisms for the starter and the motor, should a fault or overload condition occur. Finally, a thermal overload provides additional protection against short circuits or overloads in the motor circuit.

Wiring a DOL Starter Circuit

In order to wire a DOL starter circuit correctly, it is important to understand the different types of connections that need to be made. Here, we will examine the most common connections and how they should be wired.

Contactor Connections

The contactor is the main switch in the circuit and is typically wired with two line wires: L1, the line from the power source, and L2, the line to the motor. Additionally, there are three more wires that need to be connected: the start, stop, and common (C). The start and stop wires provide the start and stop signals, which control the contactor’s opening and closing. The common (C) wire is the ground for all of the other wires.

Overload Relay Connections

The overload relay needs to be connected to the contactor, as well as the motor. The connections for the overload relay are made with two line wires: L1, the line from the power source, and L2, the line to the motor. Additionally, two wires need to be connected: the start/stop wires, which control the activation of the overload relay, and the common (C) wire, which is the ground for all of the other wires.

Thermal Overload Connections

The thermal overload is a device that is used to protect the motor from short circuits or overloads. The thermal overload should be wired with three wires: the line (L1), the neutral (N) and the common (C). The line and the neutral wires will connect to the power source and the common wire will be connected to the ground for all other wires.

Conclusion

In conclusion, wiring a DOL starter circuit requires knowledge of the different components and their respective wiring diagrams. The contactor, overload relay, and thermal overload are the three main components that need to be connected and wired properly for the circuit to work correctly. By understanding the different types of connections and how they must be wired, one can ensure that the DOL starter circuit is functioning properly.

3 Phase Dol Starter Wiring Diagram