Thermal Arc 350 Ultra Flex CC/CV Connected to Lincoln LN-7 Wire Feeder
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  1. #1
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    Jul 2015
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    Default Thermal Arc 350 Ultra Flex CC/CV Connected to Lincoln LN-7 Wire Feeder

    Very cautiously working towards hooking up a LN7 wire feeder to my Thermal arc base welder. Have ordered the Amphenol connector.

    I have attached photographs of what I think are the relevant parts of the respective wiring components. I have full schematics that I could post as well if requested.

    BASE WELDER (Amphenol 19 Pin Connector)(only detailing pins that had a wire soldered).

    Pin A (red) Contactor Ckt. (+15v)
    Pin B (brn) Contactor Ckt. (A-B closure turns power source on)
    Pin E (blk) 120 VAC
    Pin F (wht) 120 VAC Neutral
    Pin G (grn) Chassis Frame Ground


    D 115 VAC
    C 115 VAC
    F Work
    B To Contactor Circuit
    A to Contactor Circuit
    E Ground

    Questions (very basic):

    Is wire feeder E Ground the same as Pin G Chassis Frame Ground?

    Is wire Feeder wire F Work the large welding cable that hooks to the work to be welded?

    The Wire D & C 115 VAC of the FEEDER does not specify which one is Neutral, How can I figure which is nuetral so I can hook it up to the nuetral of 120 VAC Neutral of the WELDER?

    The Wire B & A to Contactor Circuit of the FEEDER does not specify which is positive, nor the voltage. Does the order, or voltage, matter when I hook it up to the corresponding two wires on the WELDER?

    Any details or suggestions would be appreciated.


  2. #2
    Join Date
    Feb 2013
    Northern califorina, usa
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    There are a bunch of serial number changes through the LN-7 feeder series.
    You can check out the sequence of operation for your serial number LN-7 on Lincoln's web site under operators manuals.
    This should answer your questions.
    E is chassis ground.
    F is used when the feeder is equipped with meters.
    I don't believe D and C are neutral sensitive.
    Contact closure between A and B when used with a Lincoln power source completes the circuit of the primary contactor. Your power source A and B should preform the same function.

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