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  1. #1
    Join Date
    Jan 2014
    Posts
    6

    Default Trailblazer 250G runs but doesn't generate anything

    Need a little assistance, I have a welder s/n KB145838 that doesn't generate much voltage. I tried flashing it at wires 17 &19 and didn't get and sustainable change. Fuses are good, I get .6 volts across wires 14&15 with unit running and 2 volts at outlet. Any ideas? Thanks

  2. #2
    Join Date
    Feb 2012
    Posts
    224

    Default

    Have you checked your brush length or cleaned the slip rings ?

  3. #3
    Join Date
    Jan 2014
    Posts
    6

    Default

    Do you have what the tolerances should be, I ohmed them out and they seem ok. Also can you clarify for me, how does the exciter coil create the AC voltage. Is it through the rings and brushes? Thanks

  4. #4
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,825

    Default

    Didn't have much time to look up what year machine you have but read through this.
    http://www.millerwelds.com/resources...highlight=250G
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  5. #5
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,825

    Default

    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

  6. #6
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,597

    Default

    Manually exciting it probably was stupid, as the unit has an exciter board. You likely took out a diode in the line. Since your f1 fuse was ok, the brige it protects is ok. Your exciter board is the likely culprit and the the diode inline with wire #18 is now poofed.

  7. #7
    Join Date
    Jan 2014
    Posts
    6

    Default

    Thanks for info fellas. Cruzier, this unit has only one board and it's called the Field Current Regulator Board. Is that the same thing as the exciter board?

  8. #8
    Join Date
    Jan 2014
    Posts
    6

    Default

    I meant Cruizer

  9. #9
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,597

    Default

    You want to check for resistance between wires #28 and #15. pull these wires of bridge SR3. If you get less than 5 ohms, this circuit is happy, if not then this circuit is toast, and there is nothing you can do about it. Generator is trash.

    If it measures well, brushes are good, clean the the slip rings with a fine emery cloth splashed with brake cleen. If this all fails then yes its that regulator board

  10. #10
    Join Date
    Jan 2014
    Posts
    6

    Default

    Cruizer, wires 15 & 28 ohmed at .4 ohms between them disconnect from the SR3. We swapped the board out with a good one from our other 250g trailblazers as one of the first things that we tried and got the same results. I'll try to clean the rings and take a another look at the brushes . Thanks again.

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