Need Help! Plasma blows relay..........!!!!WHY - Page 2


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Thread: Plasma blows relay..........!!!!WHY

  1. #13
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    Default Re: Plasma blows relay..........!!!!WHY

    or can I ground it on the body where all the other grounds are? It is currently on the the earth on the power supply. Any idea why my relay switches on when i touch my signal wire to the ground. As I understand it must open when i touch the 5v......but it shorts out when i touch the 5v



  2. #14
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    Default Re: Plasma blows relay..........!!!!WHY

    is this how your machine is wired?

    Plasma blows relay..........!!!!WHY-wiring-jpg

    your diagram of the arduino relay does not have the "snubber " across the relay contacts (100 ohm resistor in series with 0.1uF)
    the "snubber" helps to reduce the arc as the relay opens

    assuming all of your power supplies have no connection between the output and the supply ground

    the connection shown between the work piece and the 24V negative can explain why touching a wire from the relay boards input to ground switches on the relay

    it will also explain why connecting the +5v to ground short circuits it

    John

    PS
    wiring diagram V2
    a possible alternative relay board connection
    with opto-isolator input circuit powered by USB motion card +5V

    Plasma blows relay..........!!!!WHY-wiring-v2-jpg

    PPS

    part of photo of relay board posted
    Plasma blows relay..........!!!!WHY-relay-v2-jpg
    when the jumper is fitted
    JD-VCC & VCC are connected together

    relay boards circuit diagram adapted from diagram found on line

    Plasma blows relay..........!!!!WHY-optorelay-x2-connection-bob-jpg

    Last edited by john-100; 06-13-2018 at 05:57 AM. Reason: add PPS and correct relay board


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Plasma blows relay..........!!!!WHY

Plasma blows relay..........!!!!WHY