How to Test a Relay?
Some techniques to test if the Relay is working are
DIAGRAM
- With a multimeter
- By build a simple circuit
- By use a DC power supply to see the proper functioning.
Steps to Test a Relay
Given below are the Steps to Test a Relay
1. Identify Relay Terminals
- Coil Terminals which are marked or can be found on the relay data sheet.
- Common (COM) these terminals change between NO and NC Contacts
- Normally open (NO) these terminals are open when the relay is de-energized.
- Normally Closed(NC) these terminals are closed when the relay is de-energized.
2. Test the Coil
- Set the multimeter to the Resistance Mode
- Measure the coil Resistance
3. Test the Contacts (Without Power)
- Set the multimeter to the Resistance Mode
- Measure the NC Contact
- Measure the NO Contact
4. Activate the Relay
- Apply the rated voltage to the coil.
5. Test the Contacts (With Power)
- Measure the NC Contact
- Measure the NO Contact
What is Relay?
A relay is an electrically operated switch in the context of electronics and electrical engineering. It is made up of a coil and one or more contact sets. When an electrical current runs through the coil, a magnetic field is created that activates the contacts, allowing them to open or close the circuits. Relays are frequently employed in automotive applications, industrial automation, and control systems to control high-power or high-voltage devices with a lower-power signal.
Table of Content
- Electrical Relay Definition
- Electrical Relay Structure and Operating Principles
- Contact Types of Relay
- Electrical Relay Types and Classification
- Applications of Relay
- How to Test a Relay?
- Advantages and Disadvantages of Relay