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  1. #1
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    Default Migomag Supamig 200c

    This is my first post here so apologies up front
    I have a migomag supamig 200c I can’t get the wire feed to work seem to be power to the moto,
    When I pull the trigger I do hear a click on the Wire doesn’t work but if I connect the wire feed to outside power source it works fine. Any ideas

  2. #2
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    Default

    Hi and Welcome to a TOP FORUM. It sounds as if you have a problem in the Contactor.
    MigOMags rarely give any problems. I've had a similar situation where the wire feeder would only work when the torch was held in a certain spot, caused by a break in the wire as it enters the torch handle.
    Sounds like a job for an electrician to inspect it. I would get someone to have a look at it if you're the least bit certain of what's going on in there.
    We like to try to keep our members alive, not crisp.
    Kryn
    To grow old is mandatory, growing up is optional.

  3. #3
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    Default

    Are you running gas? If so when you press the trigger is gas coming out of the gun?

  4. #4
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    Default

    I've had a similar issue with a Migomag 315 and it turned out to be the potentiometer that controls the wirefeed speed. It's a simple and cheap fix if it proves to be that - $5 at Jaycar and a simple de solder and resolder job, BUT, as others have posted, it requires entering the internals of the machine, so best to take it to someone if you are not competent and comfortable with electrical safety.
    As others have mentione, check that the gas solenoid is being energised and that current is reaching the contact tip when you pull the trigger (you can even scratch the contact tip over your earth clamp to verify that current is being delivered). If the answer is yes to both these questions, then most probably, your wire feed pot is at fault (you've already verified the motor works by externally powering it).
    Many people look down their noses at Migomag, but they are a solid, albeit basic machine that gives few problems and what problems they do give are usually easily rectified.

  5. #5
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    Default Thx for the replys

    Migomag Supamig 200c
    KBs PensNmore said:
    1st Feb 2020 05:19 PM
    Default
    Hi pensNmore
    wot exactly is a Contactor????

  6. #6
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    Default Com. Vc

    I’m try to convert it to gassless

  7. #7
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    Default Carl robbers

    When you say check that the gas solenoid is being energised and that current is reaching the contact tip.
    I have put a multi meter on the tip an the earth clamp an there is current there. Is that right????

  8. #8
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    Quote Originally Posted by Skippyroo View Post
    When you say check that the gas solenoid is being energised and that current is reaching the contact tip.
    I have put a multi meter on the tip an the earth clamp an there is current there. Is that right????
    Yes that is correct. I assume that your multimeter is set to Volts DC. You could get voltages up to 70 odd volts depending on the machine, but as long as there is a voltage present when you pull the trigger and no voltage when you release the trigger then that's fine. That tells you that the trigger circuit is working and that the main contactor is pulling in.
    First step, check all fuses that are externally accessible. Looking back at one of your earlier posts, you mention that there is power to the motor, but it doesn't go, but if you power the motor from an external source it will run. If you turn your wire speed dial up to full speed and connect a multimeter to the two wires that run the motor then pull the trigger, what voltage do you read? Now try the same with a few different settings on the wire feed control. What voltage do you observe? I think maximum voltage you should see will be 24V, but it could be up to 110V on some machines so please read my earlier post and remember to keep fingers and other bodily bits clear of any electricity. Does the motor run or try to run at any point while doing this? Make sure that you release the wire tension roller while doing this and also check for any up and down play in the shaft with the feed roller attached as this can bind up if excessive. when you powered the motor from an external source, what voltage did you use and did the motor run consistently, strongly and smoothly?
    At this point, turn off and unplug the machine.
    Your next step will be to remove the cover and check the potentiometer (commonly known as a pot) that the wire feed control knob is attached to. You are looking for broken wires firstly. If no wires broken off at either end, then check out the numbers on the pot as these describe the resistance value of the pot. At this point, you will want to get the compressed air and give the machine a good blow out if you can. Have a look at the circuit board for any obvious damage such as burned components You now have two choices, option 1 will be to attempt to put a multimeter on the pot and test the values. Option 2 is to just go to Jaycar or a similar electronics shop and buy a new pot then swap them over. Personally for the price of them, I would just replace the pot and be done with it. It is easier in many cases to take the old pot with you. Make sure that you mark the wires and either draw or photograph where they go on the pot (I like to use masking tape for this as you can write on it, then wrap it around and stick it to the wires. I should add a caution at this point that not all pots are mounted to the case of the machine and connected to the board with wires, some are soldered to the board directly and then mounted to the machine case. If yours is one of these, take all care not to force or damage the board and work out how it unplugs and releases before you remove the board as you don't want to damage the circuit board at all. All Migomags that I've been involved with (4 or 5) have been of the type where there are wires connecting the pot, so I reckon you will be okay. It is possible that this could be a circuit board issue, but Migomags are simple and every fault I have ever seen with them has been more to do with wires and mchanical components then circuit boards.
    If you aren't sure at any point, then upload a photo and a lot of people here can walk you through what you are looking at and how to proceed.
    I did notice that you wanted to convert the machine to gasless. Had you started any of that before the welder quit and if so, what had you done? Just making doubly sure that you may not have accidentally done something that has induced the fault.
    I will say once more that once you take the covers off to investigate, you are entering a world of high voltages and high currents. If you are not sure that you can do this safely, then take it to a welder repair shop or enlist a sparky.
    Let us know how you get on.

  9. #9
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    Default

    Quote Originally Posted by Skippyroo View Post
    Migomag Supamig 200c
    KBs PensNmore said:
    1st Feb 2020 05:19 PM
    Default
    Hi pensNmore
    wot exactly is a Contactor????
    The contactor is the main switch gear for the internals. It supplies current to the gas solenoid, the wire feeder and the transformer to supply your welding current.
    When you squeeze the trigger, you should hear a click, that's the contactor operating.
    As someone else said, it sounds like your speed control pot is not working, have you tried turning the wire feed up and down while squeezing the trigger, as sometimes they get a spot where it won't work.
    As Karl mentioned about using compressed air to blow the dust out. It's a good habit to get into of every 2-3 rolls of wire, that the insides be cleaned out, even blowing out the liner to the torch. The wire, when energised, can pick up minute particles of metal and deposit them inside the liner. The liner is similar to the stretch wire spring that is used in
    some station wagons to convert them into a sin bin, don't try to use similar, as the proper ones are made to a tight tolerance.
    HTH
    Kryn
    To grow old is mandatory, growing up is optional.

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