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Miller SRH-333 HOT HOT HOT

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  • Miller SRH-333 HOT HOT HOT

    Community College I go to has me working with an (VERY) old SRH-333. Not happy since there are Dynasty 200DXs like the one I have at home locked in the cage where we cannot use them.

    Anyway, I have a query in to Miller for a manual as this one's S/N is so old it's not listed. S/N starts with U.

    Has anyone ever worked with one of these machines? This thing burns hot like there's no tomorrow. For example 7018s I'd run on 130 amps I have to run at 70. Have to adjust down similarly for all other rods.

    Is this just the way these machines were or is it this specific machine with a problem? Possible to fix this thing?

    Think I'm going to have to make them let me do my classwork from home so I can run beads well enough to pass the class. :-)
    =======================
    Miller 211 AutoSet
    Miller Dynasty 200 DX
    Thermal Dynamics Cutmaster 42

    "The Sleep of Reason Produces Monsters"
    Francisco Goya

  • #2
    Originally posted by stickermigtigger View Post
    Anyway, I have a query in to Miller for a manual as this one's S/N is so old it's not listed. S/N starts with U.

    . :-)
    Unless I am mistaken.. a Serial beginning with "U" would fall between Serial Numbers T453406 through HG065957

    So this should be the proper manual..

    http://www.millerwelds.com/om/o230_mil.pdf

    anyway... it sure looks like it to me..

    Last edited by H80N; 01-17-2014, 10:24 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


    • #3
      Field control bridge is weak/damaged. No biggy, just get someone to change from the old style to the new style. Part costs like 5 bucks. Get it from an electroniics store. Looking for a 30 amp 800 volt unit. (volts is just the heat rating)

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      • #4
        Miller said this machine was mfgr'd in 1969 (I was a senior in HS :-)) and the manual can't be downloaded. They sent me the one published for it in 1971 - iom230e_mil.pdf

        Looking through the parts list I don't see anything called a "Field control bridge".

        Could it be called something different?

        Thanks folks.
        =======================
        Miller 211 AutoSet
        Miller Dynasty 200 DX
        Thermal Dynamics Cutmaster 42

        "The Sleep of Reason Produces Monsters"
        Francisco Goya

        Comment


        • #5
          Rectifier, 40 amp 800 volt left side upper center frame. All SRH's are the same for the last 50 years, body has changes, but not the inside

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          • #6
            Originally posted by stickermigtigger View Post
            Miller said this machine was mfgr'd in 1969 (I was a senior in HS :-)) and the manual can't be downloaded. They sent me the one published for it in 1971 - iom230e_mil.pdf

            Looking through the parts list I don't see anything called a "Field control bridge".

            Could it be called something different?

            Thanks folks.
            Could be wrong but it looks like "SR2" on figure 7-1 page 11 of this one

            http://www.millerwelds.com/om/o230_mil.pdf

            if they were using selenium rectifiers... the resistace across the junctions increases over time .. dropping the control voltage for the magnetic amplifier allowing greater current flow than the knob setting would indicate...

            the upshot is to do what Cruizer says and replace the bridge with a modern silicon rectifier bridge,,
            Last edited by H80N; 01-17-2014, 03:48 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

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