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  1. #16
    Join Date
    Jul 2009
    Location
    Melbourne
    Posts
    114

    Default

    You need to replace a 4.7 Ohm 10W resistor. The one I recommended is 25W same resistance. It should be more than adequate. You can go higher wattage, but I feel it's overkill and would rather try see the cause of the problem.

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  3. #17
    Join Date
    May 2013
    Location
    Brisbane
    Posts
    38

    Default

    Got it. I'll troubleshoot the motor and sheath and check the voltages first as suggested.

  4. #18
    Join Date
    Oct 2006
    Location
    Armidale NSW
    Age
    50
    Posts
    1,938

    Default

    If you look at the specs of the one I linked to it is only 50W if mounted on an appropriate heatsink ... otherwise it is 20W (note the 25W one is only 12.5W). I selected that one because it was the highest wattage in that price range. If you don't have space constraints I would go for the highest wattage one (within reason).
    Cheers.

    Vernon.
    __________________________________________________
    Bite off more than you can chew and then chew like crazy.

  5. #19
    Join Date
    Jul 2009
    Location
    Melbourne
    Posts
    114

    Default

    Yeah I get that, my only concern is if something is drawing so much current to generate to generate so much heat, it should be addressed. My original thought was to get the heat away from the soldering and PCB to prevent further damage if no further examination of the fault was going to be done.

    Regards

  6. #20
    Join Date
    May 2013
    Location
    Brisbane
    Posts
    38

    Default

    Ok I checked the wire feed and everything looked fine. Moves smoothly through the sheath etc. Pushed the resistor back into place and wire fed through fine. Soldered it back in place and did a few really crappy welds (another story). All was going fine then clunk clunk ... No feed. Same problem no doubt and I thought i was being careful not to overload it. Beginning to wonder if this thing is worth bothering with.

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