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Miller 330A/BP Problems

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  • Miller 330A/BP Problems

    Having issues with my 330A/BP on the low and medium amp range DC stick. I can weld ok on the high amp range setting on DC stick. I can't start a weld in either low or medium DC stick. I tried the use the tig and that would only work on the high amp range also. Wire connections all look good. I have all new leads with a new clamp on the ground and a new stinger. Nothing obvious looks wrong. I bought it a couple years ago but have only used it for heavy duty repairs up until now. Now I have a need for the low and medium amp range settings Help!!!!!!! Thank you for any Help I Can Get!!!!!!!

  • #2
    First thing I would check are the contacts on the range selector.

    Mine will give me no power in the midrange sometimes, if I just move it back and forth a couple times it will make a connection and work.

    I've not taken it apart to find out why - but I suspect my contacts are either worn or dirty.

    My AC/DC selector does the same thing sometimes - but it's a 1963 machine so a few quirks don't bother me

    Here's a tech manual I have stored in a drop box:
    https://www.dropbox.com/sh/7ijbgx67wuq6ivd/sYvAlvq_LC
    "Beware of false knowledge; it is more dangerous than ignorance." ~George Bernard Shaw~

    Airco 300 Heliwelder
    Dialarc 250 AC/DC
    ESAB 161
    Invertec v250 and v300 Pro
    SA200
    Spectrum 700 plasma
    MM210
    Miller HF-15-1
    Dirty ugly tools - perfect

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    • #3
      Originally posted by MinnesotaDave View Post
      First thing I would check are the contacts on the range selector. Mine will give me no power in the midrange sometimes, if I just move it back and forth a couple times it will make a connection and work. I've not taken it apart to find out why - but I suspect my contacts are either worn or dirty. My AC/DC selector does the same thing sometimes - but it's a 1963 machine so a few quirks don't bother me Here's a tech manual I have stored in a drop box: https://www.dropbox.com/sh/7ijbgx67wuq6ivd/sYvAlvq_LC
      I greatly appreciate the help!!!! I'm going to check out the tech manual and see if I can find the problem. Thank you again very much!!!!

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