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  1. #1
    Join Date
    Mar 2011
    Posts
    3

    Question Syncrowave 180 SD stuck on max current

    I'd appreciate some advice with resolving the following problem with my Syncrowave 180 SD - After being stored for the past 4 months in the garage I started the welder up today and to my surprise it seems to be stuck on max power using both stick and TIG. Striking an arc results in a hole blown in the metal ( a big surprise in TIG!); switching the polarity, current dial changes, etc. do not solve the problem.

    The welder is 10 yrs old, used for small projects and probably has no more than 15 hrs of running time on it. There were some cob webs inside the welder case but nothing obviously wrong. I'm totally stumped!! How could the welder go bad just sitting!?

    Thanks for any advice /help! - M. Brown

  2. #2
    Join Date
    Sep 2009
    Location
    Colorado
    Posts
    199

    Default Check the pot

    I would open the cover, and look at the potentiometer, which is connected to the amp knob. If you have an ohmmeter, turn the knob and watch the values change. Look for any kind of short or bad connection.

    Sometimes things are really obvious when you look, worth taking the time to look. Maybe you will see parts on the control board that have had the smoke let out.

    Richard

  3. #3
    Join Date
    Sep 2008
    Location
    Charlotte Court House, VA
    Posts
    105

    Default

    While you have the covers off, remove the connectors from the control board and apply some dielectric grease such as Super Lube synthetic grease to them and re-insert. Also, if I remember correctly, on the left side is the current sensor, which also has a connector on it (4 pin, I think). Unplug it and do the same thing with the grease. The sensor has a large copper bar running through it. If the problem persists after doing this, it is likey a bad current sensor. If that is the case, you can get one from Miller (very expensive) or from Digi-Key Electronics for about 1/3 the cost. Feel free to PM me if you need a sensor, and I'll try to find my records from when I ordered one.

  4. #4
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,167

    Default

    What GerryR said. The output current sensor sends a very low voltage signal to the control board so even a slight corrosion at the 4-pin connector can be the cause of the problem. Same would hold true for other control board inputs.

    There were a number of early 180 SDs that experienced CT (current transducer) failures and if it's not simple corrosion and turns out a new one is needed, another source for a replacement is miller4less.com http://miller4less.com/advanced_sear...b01ae3&x=4&y=9.
    MM200 w/spot controller and Spoolmatic 1
    Syncrowave 180 SD
    Bobcat 225G Plus LPG/NG w/14-pin*
    *Homemade Suitcase Wire Feeder
    *HF-251D-1
    *WC-1S & Spoolmatic 1
    PakMaster 100XL
    Marquette "Star Jet" 21-110

  5. #5
    Join Date
    Mar 2011
    Posts
    3

    Default

    Many thanks for the excellent advice! I put dialectric grease on all connections to the board and the 4 pin connection to the current sensor, although they all looked in real clean condition. Unfortunetly the problem continues so I will order the replacement current sensor part # 191941 in the hopes the issue is with the sensor. I will also update this thread once I have the new part installed.

  6. #6
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,167

    Default

    I might suggest you give Milller service a call tomorrow as they can give you some checks to make to confirm or narrow it down to the problem if something else.

    I was just pointing out that failed current transducers have resulted in what you describe is happening but you should confirm that's the case with yours before dropping $50.
    MM200 w/spot controller and Spoolmatic 1
    Syncrowave 180 SD
    Bobcat 225G Plus LPG/NG w/14-pin*
    *Homemade Suitcase Wire Feeder
    *HF-251D-1
    *WC-1S & Spoolmatic 1
    PakMaster 100XL
    Marquette "Star Jet" 21-110

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