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EN EP tig start polarity? on 300dx 2004

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  • EN EP tig start polarity? on 300dx 2004

    I received my brand new 10 yr old 300dx today and I had a question with the tig start polarity. Would this setting for ac be better on EP(default) or EN, set balance to 75%, since this machine doesn't have independent amp control what is the purpose of the starting polarity. I am a little confused.

  • #2
    Miller says it's better starting. I would crank up the start amps and milliseconds as well. That is one of the main things Blue Lightning has is more start amps and time on default.
    Back when I had my "pre Blue Lightning" 200DX that was advised for me to do and it helped a bunch. The only time it was a problem was when I welded ultra thin material. Then had to turn down the amps and the milliseconds.
    I don't remember the numbers but you can look at default settings on newer 200 Dynasties and get in the ballpark.
    Unless there isn't any adjustments in the hidden menu....then never mind
    Miller Dynasty 700...OH YEA BABY!!
    Miller Dynasty 280 with AC independent expansion card
    Miller Dynasty 200 DX "Blue Lightning"

    Miller Bobcat 225 NT (what I began my present Biz with!)
    Miller 30-A Spoolgun
    Miller WC-115-A
    Miller Spectrum 300
    Miller 225 Thunderbolt (my first machine bought new 1980)
    Miller Digital Elite Titanium 9400


    • #3
      On AC you don't have polarity to set.
      Lincoln A/C 225
      Everlast PA200


      • #4
        He's talking about the start parameters. When in AC, the machine can fire the very first half cycle in EP or EN.
        Mike Zanconato
        Zanconato Custom Cycles
        @mzank on Instagram
        Dynasty 280DX
        Meco Midget


        • #5
          An educated guess; as EP means the arc has to overcome the non conductive nature of oxide and or contaminant on the surface of workpiece, and arcs initiate most easily from a pointed object, I'd try EN as the first step. Is it possible you can initiate an arc in one half cycle? If you don't initiate in the first half cycle, you won't have long to wait. The next half will come soon.
          Dynasty 280DX
          Bobcat 250
          Spool gun
          Twentieth Century 295
          Twentieth Century 295 AC
          Marquette spot welder
          Smith torches


          • #6
            EN EP tig start polarity? on 300dx 2004

            Thanks! I messed with it and set it with ep and welds great! I was just over thinking it and trying to understand it. Still don't but if it works guess don't mess with it!!