Adjusting Idle to meet RPM/Hz Requirements TB 302 Airpak
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  1. #1
    Join Date
    Apr 2010
    Posts
    15

    Adjusting Idle to meet RPM/Hz Requirements TB 302 Airpak

    I decided to check the Hz output on my Carburated 302 airpak this weekend and on High idle (No load) the meter was registering 58/59 Hertz. I read the manual and the only thing I could find was how to get the machine to display RPM (Start welding machine, then flip start switch from Run-Idle 3 times) and it displayed a RPM of 35xx-36xx. It seems to be welding okay, but I recall reading somewhere if the machine isn't running at the proper output it can be hard on the board and possibly destroy one. I remember reading a while ago the 120VAC at high idle should display 62.5Hz and the machine should be at 3700RPM high Idle. The manual I have I downloaded from Millers site but it doesn't seem to have a lot of information about adjusting the idle speed (Kohler CH750). Any pointers or tips would be appreciated. Thanks.

  2. #2
    Join Date
    May 2008
    Location
    Orange, TX
    Posts
    16,726

    Re: Adjusting Idle to meet RPM/Hz Requirements TB 302 Airpak

    Your TB302 Airpak incorporates an electronic governor controlled stepper motor to regulate engine speed is non-adjustable and self calibrates upon start-up. As a result, the no-load 62.5Hz you've read about doesn't apply to the Kohler CH750 in this application as it doesn't experience the same 100-150rpm speed droop when under load that a mechanical flyweight governor does.
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  3. #3
    Join Date
    Apr 2010
    Posts
    15

    Re: Adjusting Idle to meet RPM/Hz Requirements TB 302 Airpak

    Perfect thanks a lot that's probably why I couldn't find any information about this in the manual. Much appreciated thanks!

  4. #4
    Join Date
    Mar 2014
    Posts
    139

    Re: Adjusting Idle to meet RPM/Hz Requirements TB 302 Airpak

    Quote Originally Posted by duaneb55 View Post
    Your TB302 Airpak incorporates an electronic governor controlled stepper motor to regulate engine speed is non-adjustable and self calibrates upon start-up. As a result, the no-load 62.5Hz you've read about doesn't apply to the Kohler CH750 in this application as it doesn't experience the same 100-150rpm speed droop when under load that a mechanical flyweight governor does.
    Now I know why Welding Web pays you the big bucks.

  5. #5
    Join Date
    May 2008
    Location
    Orange, TX
    Posts
    16,726

    Re: Adjusting Idle to meet RPM/Hz Requirements TB 302 Airpak

    Well they tell me the check must be lost in the mail but then, I just make it up as I go anyway.
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save 2nd Base!

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