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Plasma Cutter burnt up a resistor, need to identify it.

Discussion in 'Troubleshooting and Repair' started by tallfescue, Dec 22, 2011.

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  1. tallfescue

    tallfescue

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    Dec 22, 2011
    Hello, I have a plasma cutter which is made in Italy. When using it, it produced two loud pops. I opened it up and found these two resistors blown up. I cant seem to find them anywhere. Can someone help me read the values of these things (I don't know anything about electronics) And where I can buy a similar or compatible product.

    Thank you very much.
    [​IMG]

    [​IMG]
    [​IMG]
    [​IMG]
     
  2. jackorocko

    jackorocko

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    Apr 4, 2010
    Is the company still in business that makes the plasma cutter? I would assume they could tell you the required part value.

    The question is why did they blow? Had to be excessive current due to what? Did you double check them with a meter to make sure they where open?
     
  3. jackorocko

    jackorocko

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    Apr 4, 2010
    Last edited: Dec 22, 2011
  4. tallfescue

    tallfescue

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    Dec 22, 2011

    They are no longer in business from the research that I have done.


    Not sure why they blew, I was using using the torch, cutting metal, and then I herd two loud pops. I'm not sure what you mean by checking them with the meter to see if they are open. I have a meter, but very little knowledge in electronics. I'm a fabricator/ mechanic.
     
  5. jackorocko

    jackorocko

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    Apr 4, 2010
    do a continuity test. Set your meter to the Ohm setting, is normally green label. Put the probes on the resistor and check the value. An infinite amount of resistance means they are "open circuit" and have failed. current only flows in a closed circuit. If you get a value less then infinite, then what is that value?
     
  6. tallfescue

    tallfescue

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    Dec 22, 2011
    I have seen those resistors on eBay, and I have previously contacted this seller about it. But he doesn't have the exact ones that mine are calling for.

    The other link you provided contains lots of information, and I dont know what I'm looking for...any other link where I can order a compatible item? Thanks again.
     
  7. tallfescue

    tallfescue

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    Dec 22, 2011
    I did this, I get a value of 0, or closed circuit I assume.
     
  8. davelectronic

    davelectronic

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    Dec 13, 2010
    That is a pair of 1 ohm 50 watt aluminum clad power resistors. 1R0 = 1 ohm, the power rating 50 is on the case, ive used these resistors. :)
     
  9. davelectronic

    davelectronic

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    Dec 13, 2010
  10. tallfescue

    tallfescue

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    Dec 22, 2011
  11. davelectronic

    davelectronic

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    Dec 13, 2010
    Absolutely fine, the same component, but closer to home. :)
     
  12. jackorocko

    jackorocko

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    Apr 4, 2010
    Be better off going with the TE con. on digikey, they have the same flange as the original. http://search.digikey.com/us/en/products/2-1625984-2/A102158-ND/2055334

    digikey is in USA, ND to be exact. I use them exclusively. 2 day shipping most anywhere.

    sorry my first link somehow got messed up.
     
    Last edited: Dec 22, 2011
  13. tallfescue

    tallfescue

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    Dec 22, 2011
    Thank you guys, I am getting closer to having my question answered, and will be placing my order soon with digi key.

    Another question: it seems that these two resistors are connected in a series. Why not just get one resistor with double the value -- I assume in this case 2 ohm, 50 watt? What is the benefit of having 2 over 1 resistor, or a greater number of resistors over a fewer number of resistors?
     
  14. davelectronic

    davelectronic

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    Dec 13, 2010
    I am not sure if 100 watt aluminium units exist, and one end of your resistors is connected, the other end is not in the picture, so they could have been parallel or series orientated. But i would think parallel. Thinking about it 100 watt units probably do exist, it could have been anything from manafacturer avalibility, or cost etc.
     
  15. jackorocko

    jackorocko

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    Apr 4, 2010
    price is mostly why they do this sort of thing. Availability of parts is the second most reason. I am with you though, it looked like it was wired in series. One side was connected to the other side of the second resistor. The sides missing the wire is where I assume you disconnected the resistors (In other words, you didn't touch the side where the wire is still connected?) Then it was wired in series.
     
  16. tallfescue

    tallfescue

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    Dec 22, 2011

    Correct, I did not touch the connected contacts.
     
  17. tallfescue

    tallfescue

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    Dec 22, 2011
    I want to thank everyone for helping me in this matter. My didi key order came here Tuesday. As you can see from the pic, part is nearly identical to my original. Installation went smooth. Plasma cutter fired up and working. Thank you again, Merry Christmas and a Happy New Year !!!!

    [​IMG]
     
  18. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Good job :)
     
  19. davelectronic

    davelectronic

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    Dec 13, 2010
    Glad your getting it running again. Merry Christmas and a Happy new year to you. :)
     
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