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Low Volt Relay Control Wiring Diagram


By Dave Rongey - Summary:

When the 24V is applied to the relay the relay just “Buzzes” but contacts in the relay don’t close to pass through the 240V AC. The relay has a manual test button and if I press this everything works fine…


Considerations When Wiring Low Voltage Control Relays

Question: I am using 24VDC relays to switch 240VAC (15Amp)on irrigation line. My 24V DC supply is only 1000 MAmp. When the 24V is applied to the relay the relay just “Buzzes” but contacts in the relay don’t close to pass through the 240V AC. The relay has a manual test button and if I press this everything works fine.The Relay is a 782-2C-24D DP relay. I have tested the input voltage at 25.7V DC. Any suggestions.

This electrical question came from: Gerry, a Homeowner from Fernvale Queensland

Dave’s Reply:
Thanks for your electrical question Gerry.
Gerry, you may have to increase the size of the control voltage power supply. Check the operational power requirements for the relay. Check the wire size and length of the control wiring as well.

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2 Responses to “Low Volt Relay Control Wiring Diagram”
  1. earle says:

    I want to use two power supplies ( 100 metres apart )to operate one 24 volt ac relay which in turn turns our bore on, how do I do this? Are diodes required?

    • Dave Rongey says:

      Hi Earle,
      When electrical equipment needs to operated or monitored over a long distance then I would recommend considering the use of a telemetry system. Telemetry, also know as SCADA, is where communications such wireless or a cable system such as a standard telephone cable or fiber optics cable may be used to start or stop any device as well as monitor just about any function. Telemetry devices are available from several manufacturers and have the capabilities for Digital I/O which may be used for Starting and Stopping equipment, and Analog Inputs and Outputs which may be used for controlling speed or reading temperature etc.. Software packages may also be installed to provide a graphical user interface of the real time operations, or even a video display of the equipment. I have installed several SCADA systems and found them to be extremely beneficial.
      If a SCADA system such as this is not needed for one start stop function then a low voltage relay may be used, however the wire size will have to be adjusted for the distance and a separate DC power supply may be provided for part of the system to power the control relay.
      Dave


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