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Thread: 220 or 110...how does the machine know?

  1. #1
    Junior Member SpEd's Avatar
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    220 or 110...how does the machine know?

    How does my LP-40D know whether it's plugged into a 110 outlet or a 220? I understand it'll have a different plug at the end of the wire, but is there a switch somewhere inside I can't find a reference to in the manual that I need to change?

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  2. #2
    I don't thin it knows I just think it does the same thing it would on 220 it's just weaker because there is less juice coming in. I really don't know anything about electricity though and just pulled that out of my you know what.
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  3. #3
    I think your you know what is pretty close Freddy.
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  4. #4
    Senior Member jbman45's Avatar
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    Pretty sure what happens is you only use one leg of the sine wave, or one half of the full wave; therefore you have only half the amps available for input; and reduce the output probably by the same. Not so much of how does it know, more like it will put out only as much as you put in. Would be great for portability for small welds and that sort of thing when 220 is not avail; but I would use 220 when ever you have a heavy load on the machine, seems like it would be easier on the machine to split the load.

    Reminds me of the age old question...since a thermos keeps hot liquids hot; and cold liquids cold....... how does it know what to do????
    jbman45
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  5. #5
    Moderator KHK's Avatar
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    No matter, 220, 110 power that you use the machine changes it to DC, then, it is changed to AC, like 400 cps, then it is run through a transformer to get high amps low voltage. The last step is a welding voltage & current. It is a little more complicated than this, but this is the basic idea.
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  6. #6
    Junior Member SpEd's Avatar
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    220v of electrical killing power! GreenSmoking God bless electricity. rockonicon

    Hobart Stickmate LX235 AC/DC Stick Welder
    Northern Tool MIG 135 Welder
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    Couple 4 1/2" angle grinders
    Lots (I mean LOTS!) of old grinder wheels

  7. #7
    So to just to make sure, if you use 110 instead of 220 you can still cut the same metal, just it will have a bigger load, right?
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  8. #8
    The thickness capability will be thinner with the 110 source.
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  9. #9
    Senior Member jbman45's Avatar
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    22Lambo, you sort of are thinking the right way. If you're on 110 you use more amps than on 220, so yes if you're cutting the same size material you are using about twice the amps. But you won't be able to cut as thick material on 110 as Gadget said. You are limited by the current draw or "load" as you put it. Your machine as a max current or load it will permit, so does your house/shop wiring. When your shop or machine hits it's max it will show the overcurrent light and shut down the machine or trip a breaker in your shop. So 220 is always better, 110 is convenient for using your machine somewhere else when 220 is not available.
    jbman45
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  10. #10
    Junior Member SpEd's Avatar
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    Using it this weekend, I really had to turn it down a bunch cutting some 1"square tubing, probably 1/8" thick. I still need to practice with it a bunch!
    Hobart Stickmate LX235 AC/DC Stick Welder
    Northern Tool MIG 135 Welder
    Klutch ST80i Stick/Tig
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    LONGEVITY ForceCut L40D Pilot Arc Plasma Cutter
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    Couple 4 1/2" angle grinders
    Lots (I mean LOTS!) of old grinder wheels

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