What is a Relay System ? | Summary and Q&A

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May 14, 2018
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RealPars
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What is a Relay System ?

TL;DR

Learn about relay systems, their functions, and their common applications.

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Questions & Answers

Q: How does a relay system work to control car headlights?

In a car's relay system, when the headlight switch is turned on, a coil circuit is completed, energizing the electromagnet inside the relay. This causes the contacts to close, connecting the 12-volt power source to the headlights and turning them on.

Q: Why are relay systems commonly used in industrial settings?

Relay systems are often used in industrial settings, especially for motor control, because they allow for the use of lower voltage and current in control circuits while allowing higher voltage and current to pass through the relay contacts to operate the motor.

Q: What are the benefits of using relay systems for safety purposes?

Using relay systems for safety purposes allows for the control of high voltage or high current devices while using a lower voltage to power the controls that energize the relay. This helps protect operators from potential harm and ensures the proper functioning of the equipment.

Q: How are relay systems commonly controlled?

Relay systems can be controlled using switches, push buttons, and sensors. These input devices are used to energize the relay and initiate the closing or opening of the relay contacts.

Q: What is the purpose of using a relay system in an industrial conveyor belt?

In an industrial conveyor belt system, a photoelectric sensor is used to detect the presence of boxes on the belt. When a box blocks the sensor's beam, it acts as a switch to send a low voltage signal to the coil of a motor starter relay. This energizes the relay and allows high voltage to pass through the contacts, turning the motor on and running the conveyor belt.

Relay systems are an essential part of modern control systems, enabling remote or automatic control of various devices and equipment. They are used in everyday applications like car headlights and are especially prevalent in industrial settings for motor control and safety purposes. By using relays, higher voltage and current devices can be powered while using lower voltage and current for control, ensuring safety for operators and equipment.

Summary & Key Takeaways

  • A relay is an electromagnetic device that controls the opening and closing of circuits in remote or automatic control systems.

  • Relay systems are commonly used in everyday applications such as car headlights, as well as in industrial settings for motor controls and safety reasons.

  • These systems use a lower voltage and current for control, while allowing higher voltage and current to pass through the relay contacts.

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