Testing a constant voltage source without a feeder
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  1. #1
    Join Date
    Aug 2016
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    Michigan
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    84

    Testing a constant voltage source without a feeder

    I have to send a buddy to go look at a welder for me. It's a Mig power source, but there's no feeder with it. I have a couple here, but he does not.
    How can i get this welder tested without a feeder available?

    Just power it up, short the contactor pins, and test for voltage? It obviously wouldn't be under load then. It's very unlikely it's a bad power source, but you never know.

    Any ideas?
    Miller 330 A/BP w/ WP-18 torch / WP-26 torch
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  2. #2
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    Mar 2010
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    Ceres, California
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    3,261

    Re: Testing a constant voltage source without a feeder

    First you will need a clamp on amp meter. 25 foot length of weld lead with the right terminals to short the welder output terminals. Lay lead out in a big circle and connect to welder.
    put meter on weld lead. power up welder with output set to minimum. key welder output on.
    Measure current. check data plate for max output current. first.
    once you can measure current turn it up toward max. just long enough to get a reading then turn out put off. This will only tell you if the welder can produce rated raw output and it might weld. The only real way to guaranty it can weld is to take a feeder or spoolgun and wire weld with it. If the cap bank or output inductor are bad a load test will not see it. only a live arc will tell.

  3. #3
    Join Date
    Mar 2015
    Location
    Milwaukee, WI
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    222

    Re: Testing a constant voltage source without a feeder

    As a very basic test, you could see how it behaves when shorted with different diameter wire (fusing current) -
    http://www.powerstream.com/wire-fusing-currents.htm

  4. #4
    Join Date
    Aug 2016
    Location
    Michigan
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    84

    Re: Testing a constant voltage source without a feeder

    It's a big transformer welder, diodes only inside it. CP-200.
    Miller 330 A/BP w/ WP-18 torch / WP-26 torch
    Miller CP-300 Haas / Kamp'd
    Homemade tig cooler
    Miller HF-15-2WG
    Compakomatic 300A power supply (Free to WW members)
    Miller 30A feeder (for sale)

  5. #5
    Join Date
    Apr 2018
    Location
    TN
    Posts
    162

    Re: Testing a constant voltage source without a feeder

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  6. #6
    Join Date
    Mar 2014
    Posts
    559

    Re: Testing a constant voltage source without a feeder

    Quote Originally Posted by 86turbodsl View Post
    Just power it up, short the contactor pins, and test for voltage?
    You got it.

  7. #7
    Join Date
    Aug 2016
    Location
    Michigan
    Posts
    84

    Re: Testing a constant voltage source without a feeder

    Funny responses, but in the end it was easier to just bring my feeder the 100miles and test myself.

    Sent from my LG-TP450 using Tapatalk
    Miller 330 A/BP w/ WP-18 torch / WP-26 torch
    Miller CP-300 Haas / Kamp'd
    Homemade tig cooler
    Miller HF-15-2WG
    Compakomatic 300A power supply (Free to WW members)
    Miller 30A feeder (for sale)

  8. #8
    Join Date
    Mar 2014
    Posts
    559

    Re: Testing a constant voltage source without a feeder

    Cool! You wasted posters time but I kinda think that's what this is all about anyway...

  9. #9
    Join Date
    Jul 2014
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    Bulldog Heaven at the end of my chain
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    2,485

    Re: Testing a constant voltage source without a feeder

    Quote Originally Posted by ccawgc View Post
    First you will need a clamp on amp meter. 25 foot length of weld lead with the right terminals to short the welder output terminals. Lay lead out in a big circle and connect to welder.
    put meter on weld lead. power up welder with output set to minimum. key welder output on.
    Measure current. check data plate for max output current. first.
    once you can measure current turn it up toward max. just long enough to get a reading then turn out put off. This will only tell you if the welder can produce rated raw output and it might weld. The only real way to guaranty it can weld is to take a feeder or spoolgun and wire weld with it. If the cap bank or output inductor are bad a load test will not see it. only a live arc will tell.
    I used to do it with a shunt type meter also. However most don't have a correct shunt, or meter to use. Needed that when thawing frozen pipes, or jump starting a dozer, (for instance)with a welder.
    Slob

    Purveyor of intimate unparalleled knowledge of nothing about everything.

    Oh yeah, also an unabashed internet "Troll" too.....

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