Relays are discreet devices that are used to permit a low power logic signal to control a much higher power circuit. The relay isolates the high-power circuit. It helps to protect the lower power circuit by providing a small electromagnetic coil for the logic circuit to control.
These easy steps can teach you how to test a relay device.
• Determine the coil requirements of the relay.
• View the applicable datasheet and verify the voltage and current requirements of the control coil.
• This info may also be written on the case of larger relays.
• Find out if the power coil is diode protected.
• A diode is applied to safeguard the logic circuitry from harm due to noise spikes. The bar will be linked to the input or positive connection of the control coil.
• Examine the contact configuration of the relay.
• Test Drive the de-energized condition of the relay contacts.
• Use a digital multimeter to scan the resistance between each pole of the relay and corresponding contacts for that pole.
• Energize the relay.
• Use independent voltage source appropriate for a rating of the relay coil. Listen In for a click when the relay is revitalized.
• Safety Check the energized condition of the relay contacts.
• Use a digital multimeter to test the challenge between each pole of the relay and the corresponding contacts for that pole.
• All NO contacts should read O ohms.
