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Thread: Idealarc 250 polarity switch layout.

  1. #1
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    Idealarc 250 polarity switch layout.

    My switch was burn on one side. add first I hardwired the burn side to test the welder out. But I wanted to remove the switch and just add Quick disconnect sockets to it. But now I'm confused. I see 5 connection . I know which on are for AC but how do you connect for DC.

  2. #2
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    Re: Idealarc 250 polarity switch layout.

    You can download the manual from Lincoln Electric. But...I don't think you will find anything with a picture of the polarity switch. You should have taken a picture of the switch before you started disconnecting stuff; I would have also label each wire. You should be able to figure this out if you know how to read schematics; if you don't, then you need to learn. Replacement switches are not cheep; and if connected wrong; the smoke will spill out.

  3. #3
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    Re: Idealarc 250 polarity switch layout.

    is your welder have a round top or a flat top. I found a drawing for the flat top that might help.
    If your welder is real old the sequence DC+ DC- AC might be in a different order.
    I will try to post it tonight. Have to copy it out of a service manual as a single page and then it can be posted here. List price on that switch is around $200.
    You might be able to bypass the switch and have 4 terminals on the welder front. 2 AC and 2 DC.
    Need the code number for more help. If you can't read the diagram pasted to the cover, call Lincoln with your code number and the will fax or e-mail you a clean copy.

  4. #4
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    Re: Idealarc 250 polarity switch layout.



    This switch is the newer codes that has DC+ in the center position.


    Sent from my iPhone using Tapatalk
    Steve

    1990 Miller Dialarc 250
    1993 Miller Maxstar 140 STR
    2015 Lincoln MP210
    1966 Lincoln SA200 Redface

  5. #5
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    Re: Idealarc 250 polarity switch layout.

    Here is the lay out of the switch used in the flat top model.
    Should be close. DC+ and DC - may be backwards from your model.
    need code number
    Attached Images Attached Images

  6. #6
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    Re: Idealarc 250 polarity switch layout.

    If you cannot find the schematic, you can use a meter to find the output information too. Pictures can also be used to help.
    Snap some photos of the wiring involving the switch and any other circuits connected to the switch. If you wish to install 4 quick connect cam terminals, we can identify the wires without much doubt. Replacement of the switch is also possible.
    Stay safe and have fun.
    Kolas

  7. #7
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    Re: Idealarc 250 polarity switch layout.

    I am interested in purchasing the Polarity ac/dc switch assembly can you recommend where i can please

  8. #8
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    Re: Idealarc 250 polarity switch layout.

    Quote Originally Posted by koon koon View Post
    I am interested in purchasing the Polarity ac/dc switch assembly can you recommend where i can please
    First look up machine for manual. Then check parts lists for correct number. Then search the number online.

    There are at least 2 numbers one with -1 and other with -2 at the end.

    https://www.shopwelderparts.com/weld...ric-9sm12522-1

    https://www.shopwelderparts.com/weld...ric-9sm12522-2

  9. #9
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    Re: Idealarc 250 polarity switch layout.

    Lincoln uses code number on machine for parts.

  10. #10
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    Re: Idealarc 250 polarity switch layout.

    Quote Originally Posted by koon koon View Post
    I am interested in purchasing the Polarity ac/dc switch assembly can you recommend where i can please

    If you have this machine and have a bad switch you can take the switch apart, clean the contacts, and rebuild it. See the post in the link below from my restoration thread.
    https://weldingweb.com/vbb/threads/7...92#post8764192

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