Understanding The Starter Motor Relay, And What It Does

In heavy equipment, starter motor relays play an important role. As one of the important components in the circuit, they are used to control the starting and stopping of the motor. This article is for readers to better understand the starter motor relay. MyMROmarts will introduce the definition, function, and connection method of the starter motor relay in detail.

What Is A Starter Motor Relay

A starter motor relay is an electrical relay that is commonly used in a variety of heavy equipment. It is an electromagnetic switch that can control the start and stop of high-power motors according to the input of external signals. In the industrial field, much large-scale equipment requires a large starting current, and a starter motor relay is required to complete this task. Therefore, starter motor relays play a vital role in industrial automation and control systems.

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What Does A Starter Motor Relay Do

a. When we need to start the motor, the starter motor relay will receive the signal from the control system. A magnetic field is generated through the coil to attract the relay contacts to close. Thereby connecting the power supply to the motor to make it run.

b. The starter motor relay usually includes a thermal overload protection mechanism that monitors the operating current of the diesel engine starter. When the current exceeds the set threshold, the relay will disconnect the power supply. Protect starter motors from overload or catastrophic damage.

c. The starter motor relay also plays an important role in isolating the circuit. By using relays, we can completely isolate the control circuit from the high-voltage power circuit to ensure the safety of users.

How To Wire Up A Starter Motor Relay

a. First, it is necessary to select the appropriate starter motor relay type according to the requirements of heavy equipment. The appropriate relay should be selected according to the electrical parameters and control requirements of the heavy equipment.

b. The relay has a coil, which is used to generate electromagnetic force to control the switch action. Generally, the voltage and other information will be marked on the coil. It needs to be properly connected to the control circuit to ensure that the control signal can trigger the relay normally.

c. Relays usually have multiple sets of contacts, including normally open contacts, normally closed contacts, etc. According to the control needs of heavy equipment, select the appropriate contact to connect. Normally open contacts are in a conduction state when the relay is not controlled. Normally closed contacts are the opposite and are normally open when the relay is uncontrolled.

d. For the characteristics that the relay has a protection function, it is necessary to set the protection parameters according to the electrical parameters of the heavy equipment. For example, the overload protection current value and start delay time can be set. This can ensure that the electric motor is reasonably protected during the start-up and operation of other diesel engine components and large equipment.

e. Usually, the triggering of the relay requires an external control signal, which can be manual control or a signal from other automatic control equipment. It is necessary to ensure the stability and reliability of the control signal so as not to affect the normal start and stop of the equipment.

f. Finally, connect the power wires from the motor to the contacts of the relay. Enables the motor to be controlled by a relay. At the same time, connect the protective device of the motor with the protective contact of the relay. In order to realize the comprehensive protection of the motor.

Starter motor relays play a very important role in heavy equipment. Through the control circuit start, stop, and current protection functions. It ensures the normal operation of heavy equipment and the safety of users. When connecting the starter motor relay, it is necessary to make a corresponding layout and adjustment according to the specific requirements and design.