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  • voltage left over

    there is voltage at the RS plug when the power is turned off(19v). this was measured between the hot & common, also between the hot & ground. RS plug is fine, hot to #1, common to #2. Also found the same situation on other machines. Could this be an issue with the way the service is wired at the breaker panel?

  • #2
    Re: voltage left over

    Very possibly, and it's something that should be checked ASAP... you have a potentially dangerous situation there. If you are unfamiliar or uncomfortable with working around mains lines, call an electrician... and even if you are comfortable and familar with working on line voltage, approach this situation VERY cautiously.

    First of all, are you reading 19v AC or 19v DC? Sometimes if you have a lot of wires bundled together near high-amp lines, you can get an inductive DC reading, but no amperage... it's a fairly rare situation... some meters might not even pick it up. If it's reading AC, to put it mildly... "Somethin' Aint Right". Next is to see if it is also common to the rest of the building... what happens if you down the front-end feed and check a receptacle behind the counter? Do you get voltage there was well? How about if you leave all the feeds turned on, but shut off the main to the whole building? Is there still voltage there? Knowing that will point you where to start looking. (one important note: if you are going to shut off the whole building, DO NOT just 'throw the switch' to power everything back on. Before turning the main back on, shut off all the feed breakers, power up the main, then power on all your high-current devices one at a time (coolers, hvac, etc...), leaving about a 5-second pause between each to allow start-up loads to distribute evenly.)

    Because it's common to all the machines, I would say that's where to start looking. If you have one panel that feeds the machines, turn off the feed breaker to that panel, and all the individual breakers to the machines, then check the RS plugs... if the voltage drops to zero, turn all the individual breakers on, and leave the feed breaker to the panel off. If the voltage comes up, have the feed breaker replaced and recheck the wiring.

    If you've ever had a leak in the roof or moisture problems anywhere near the feeds to the building, have all the wiring and panels checked for residue moisture and corrosion, both which can cause voltage leaks.
    <span style="font-style: italic">Educatio est omnium efficacissima forma rebellionis</span>

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