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  • #1

    Foot pedal trips breaker

    Have a older AIRCO/MILLER 300 AMP. AC/DC HELIWELD model 3A/DDR-224HPA/BD. Periodically, as soon as I activate the foot pedal switch the 100 amp
    breaker trips.Have bypassed the switch to see if problem goes away,does not. Any ideas?
    Tags: None
  • #2
    Originally posted by HPM View Post
    Have a older AIRCO/MILLER 300 AMP. AC/DC HELIWELD model 3A/DDR-224HPA/BD. Periodically, as soon as I activate the foot pedal switch the 100 amp
    breaker trips.Have bypassed the switch to see if problem goes away,does not. Any ideas?
    What if anything shares that circuit..?? what else is turned on..at the same time??

    If I am not mistaken.. that is an orange Miller 330A/BP... and is a Magnetic Amplifier controlled machine that draws a LOT of inrush current at start....

    https://www.millerwelds.com/files/ow...s/O340_MIL.pdf
    Last edited by H80N; 12-19-2015, 06:03 PM.
    .

    *******************************************
    The more you know, The better you know, How little you know

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

    My Blue Stuff:
    Dynasty 350DX Tigrunner
    Dynasty 200DX
    Millermatic 350P w/25ft Alumapro & 30A
    Millermatic 200

    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

    Comment

    • #3
      nothing else on that circuit

      Comment

      • #4
        Originally posted by HPM View Post
        nothing else on that circuit
        Your 100amp breaker is undersized/marginal @ 230 VAC they specify a 175amp fuse

        See "TABLE 3-1" page 6 (Page 14 of the PDF)

        https://www.millerwelds.com/files/owners-manuals/O340_MIL.pdf
        .

        *******************************************
        The more you know, The better you know, How little you know

        “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

        Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

        My Blue Stuff:
        Dynasty 350DX Tigrunner
        Dynasty 200DX
        Millermatic 350P w/25ft Alumapro & 30A
        Millermatic 200

        TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

        Comment

        • #5
          HPM,

          Sounds like the circuit breaker trips as soon as the main contactor pulls in.
          If the fan runs when you power it up and then trips when you push the foot pedal,
          my suggestion would be to check the primary power connections at the main terminal block.

          There may be a short which is tripping your breaker.

          I have an old Airco Heliweld IV unit which is very similar and I run it on a 75 amps at 220 volts with no problems.
          Miller Dynasty 350, Dynasty 210 DX, Hypertherm 1000, Thermal Arc GTSW400, Airco Heliwelder II, oxy-fuel setup, metal cutting bandsaw, air compressor, drill press, large first aid kit, etc.

          Call me the "Clouseau" of welding !

          Comment

          • #6
            Ah, maxed out the unit inputs 104 , sooooo, you'd burn the house down with a 175 breaker. Never the less, you have a failed diode I'd guess. That's the only thing that would blow the breaker immediately

            Comment

            • #7
              Originally posted by cruizer View Post
              Ah, maxed out the unit inputs 104 , sooooo, you'd burn the house down with a 175 breaker. Never the less, you have a failed diode I'd guess. That's the only thing that would blow the breaker immediately
              I'll defer to Cruizer on this one...
              .

              *******************************************
              The more you know, The better you know, How little you know

              “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

              Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

              My Blue Stuff:
              Dynasty 350DX Tigrunner
              Dynasty 200DX
              Millermatic 350P w/25ft Alumapro & 30A
              Millermatic 200

              TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

              Comment

              • #8
                I agree, shorted internal part.

                Comment

                • #9
                  Outside of the issue youre having with yours, how do you like that airco 3a?

                  The reason I ask is because I just got my grubby mitts on one on the cheap. Just a 6 hour drive, round trip, to pick it up.

                  Shop kept, taken out of service 3 years ago because the shop no longer had the need for tig. Guy still has the manual for it too.

                  Opinions please?

                  Comment

                  • #10
                    I think its a 100 A service machine with a modern breaker..

                    Comment

                    • #11
                      Originally posted by ryanjones2150 View Post
                      Outside of the issue youre having with yours, how do you like that airco 3a?

                      The reason I ask is because I just got my grubby mitts on one on the cheap. Just a 6 hour drive, round trip, to pick it up.

                      Shop kept, taken out of service 3 years ago because the shop no longer had the need for tig. Guy still has the manual for it too.

                      Opinions please?
                      Ryan

                      make sure you have something hefty ready to unload it

                      it is an 870lb lump...

                      FWIW... the 330 was a great machine in it's day.... just be aware that it is Pre AC Balance adjustment....it has 50-50 balance only

                      https://www.millerwelds.com/files/owners-manuals/O340_MIL.pdf
                      .

                      *******************************************
                      The more you know, The better you know, How little you know

                      “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                      Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                      My Blue Stuff:
                      Dynasty 350DX Tigrunner
                      Dynasty 200DX
                      Millermatic 350P w/25ft Alumapro & 30A
                      Millermatic 200

                      TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

                      Comment

                      • #12
                        Well, hopefully this one won't trip the breaker when I mash the foot pedal. This will be my catalyst to improve the electrical service to the shop. I'm just squeeking by as it is, so I'll be dogging a trench for a new underground service here soon.

                        Probably should sell off my thunderbolt. I don't use it much anyway, but it was my first machine.

                        Comment

                        • #13
                          Originally posted by ryanjones2150 View Post
                          Well, hopefully this one won't trip the breaker when I mash the foot pedal. This will be my catalyst to improve the electrical service to the shop. I'm just squeeking by as it is, so I'll be dogging a trench for a new underground service here soon.

                          Probably should sell off my thunderbolt. I don't use it much anyway, but it was my first machine.
                          Ryan

                          I would be cautious about second guessing the published fusing specs... this a machine capable of 470 amps at full output

                          Originally posted by H80N View Post
                          ... @ 230 VAC they specify a 175amp fuse

                          See "TABLE 3-1" page 6 (Page 14 of the PDF)

                          https://www.millerwelds.com/files/ow...s/O340_MIL.pdf
                          You can always fuse it for less with the understanding that it will be used at reduced output... a pretty common practice...
                          Last edited by H80N; 12-22-2015, 07:30 AM.
                          .

                          *******************************************
                          The more you know, The better you know, How little you know

                          “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                          Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                          My Blue Stuff:
                          Dynasty 350DX Tigrunner
                          Dynasty 200DX
                          Millermatic 350P w/25ft Alumapro & 30A
                          Millermatic 200

                          TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

                          Comment

                          • #14
                            Which is precisely why I need more power. As it is, I have 125 amps coming from the house but budget that to 100 to give myself a little safety buffer. I do trip breakers from time to time, but it's always the 20 amp circuits.

                            My plan is to add another service from the pole of an additional 200 amps for my new addition and future expansion, i.e.; lathe and a mill.

                            Comment

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