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  • XMT 350 prolems

    Ok I have a XMT 350 that would not turn on, tested to find bad mods. changed both mods and caps had holes in the side, changed the caps. it passed all the pre power checks as per millers tech manual.... now when its powered up it only clicks loudly down in the tunnel I believe that is where its coming from, then nut'n, any ideas??? thx Ty
    2007 Trailblazer 302G
    2004 Invision 354MP
    1999 60 series feeder
    2005 Maxstar 200DX
    2007 CST280
    1999 HF 251-1
    older Hobart hefty wire feeder
    Hyperthrem 600
    Maxstar 150S(such a cute welder)
    had and sold........
    2003 XMT 304CC/CV
    1947 Lincoln SA200G short hood
    1963 Lincoln SA200G
    1975 Lincoln SA200G(best machine ever had )
    1970's Lincoln SAE400G
    2 Maxstar's 200DX's
    1 Maxstar 200SD
    CST 280
    2 CST 250
    MM130


    Railmen

  • #2
    Just to clarify, did you perform the complete pre-power diagnostic checks described in the Miller XMT 350 CC/CV tech manual before you replaced the mods and caps? Or did you do them only after replacing the parts? Is the tech manual you are using the correct one for the serial number series of your machine (top right corner of cover page "Eff w/Serial Number XX0123456")?
    Miller XMT-350 CC/CV
    Miller S-22A wirefeeder
    Bernard 400A "Q" gun
    Miller 30-A Spoolmatic w/WC-24
    CK 210 & WP-18 GTAW torches
    Hypertherm Powermax 30
    O/A Rig, Enco 4x6 bandsaw, etc.

    Comment


    • #3
      Yes the tech manual is the correct one, I did the mod1 and mod2 test initially, figured the mods were bad, one cap had a hole in the side and the other had a large bulge in the side, so replaced Mods and caps, retested all pre power checks, everything was perfect and it’s not coming on??
      2007 Trailblazer 302G
      2004 Invision 354MP
      1999 60 series feeder
      2005 Maxstar 200DX
      2007 CST280
      1999 HF 251-1
      older Hobart hefty wire feeder
      Hyperthrem 600
      Maxstar 150S(such a cute welder)
      had and sold........
      2003 XMT 304CC/CV
      1947 Lincoln SA200G short hood
      1963 Lincoln SA200G
      1975 Lincoln SA200G(best machine ever had )
      1970's Lincoln SAE400G
      2 Maxstar's 200DX's
      1 Maxstar 200SD
      CST 280
      2 CST 250
      MM130


      Railmen

      Comment


      • #4
        The newly replaced parts may have disguised the condition of the board or other previously untested parts during your post-installation pre-power checks. Not only that, risking the new parts without having tested everything in the as-is condition may cost you more in the end. If the old parts are still available, if I were doing this I would remove the new ones and put the old back in place and perform the complete pre-power checks.
        Miller XMT-350 CC/CV
        Miller S-22A wirefeeder
        Bernard 400A "Q" gun
        Miller 30-A Spoolmatic w/WC-24
        CK 210 & WP-18 GTAW torches
        Hypertherm Powermax 30
        O/A Rig, Enco 4x6 bandsaw, etc.

        Comment


        • #5
          I'm not going to recommend you do this. The caps must balance after start up.

          Comment


          • #6
            Originally posted by 1997CST View Post
            I'm not going to recommend you do this. The caps must balance after start up.
            both caps test out within 3-5% of each other...
            2007 Trailblazer 302G
            2004 Invision 354MP
            1999 60 series feeder
            2005 Maxstar 200DX
            2007 CST280
            1999 HF 251-1
            older Hobart hefty wire feeder
            Hyperthrem 600
            Maxstar 150S(such a cute welder)
            had and sold........
            2003 XMT 304CC/CV
            1947 Lincoln SA200G short hood
            1963 Lincoln SA200G
            1975 Lincoln SA200G(best machine ever had )
            1970's Lincoln SAE400G
            2 Maxstar's 200DX's
            1 Maxstar 200SD
            CST 280
            2 CST 250
            MM130


            Railmen

            Comment


            • #7
              What pre-power DVM diode or resistance check was out of spec that led you to change both power mods? If the IGBTs go, they tend to take out their gate drives as well, which would show up on the PC2 pre-power checks, and possibly the PC1 pre-power checks too. It's been a while since I worked on one, but I remember there were indicator LEDs on either PC1 or PC2 to let you know if it is getting power to the auxiliary power supply.

              Comment


              • #8
                Back to your first post, you said you replaced the parts and now it just clicks.... What is the actual voltage on the caps when it does this? Need to know if it is just the rectified voltage on the caps or is the boost circuit working at all. The caps are supposed to have 470 VDC per cap when the bosst circuit is working properly.

                There is a status LED on PC1, but the blink data is very cryptic. I have the blink rate meanings, but most of them honestly mean the board is bad IF the LED is blinking.

                Comment


                • #9
                  The XMT 350 is a different system. There are very dangerous voltages inside the case when it is operating. It is a auto line machine. It takes any voltage between 200 and 600 AC in and makes around a 900 volt DC buss. 470 volts on each large electrolytic capacitor. First thing you can do is remove the cover and look at all plugs and the modules behind and below the caps. Shouldn't need to take anything apart at this time. If the input module fails it usually explodes and black soot will be on the case and pcb. See your private messages.
                  Second thought. Make sure the wires in the plug are connected right and are tight. Then go to the line switch. If those are good proceed to instructions above.
                  You would not believe how many welders come in with complaint " will not turn on" and the only problem is loose or disconnected wires in the line plug.
                  He gave it to me without, so I added a plug to allow me to plug into my 220 dryer outlet. The power in this thing definitely makes me nervous. I always Check large caps before I touch anything. No soot and connections all tight. I'll post some pics later today and I'll respond to you message ccawgc later today. For more details visit.

                  Comment

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