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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
    226

    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
    1,847

    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
    1,847

    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
    7,742

    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.

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