how to automate relay testing

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  • redwire
    Badcaps Legend
    • Dec 2010
    • 3900
    • Canada
    #21
    Re: how to automate relay testing

    Sometimes I have to troubleshoot relay failures when in the field. This is for heaters, furnaces, stoves, refrigerator control boards.

    Ideally it should be a board-level swap, but it's easier to carry around a box of assorted relays and do a primitive test... tapping them... whack... and use a 12V car light bulb like #1156 and separate DC power supply to pull in the coil.

    Ageing relay contacts have increasing resistance and will melt the case or burn the PCB if higher current (>10A) is flowing. Dishwasher fires/recalls caused by this.

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