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Bobcat 225g plus hertz

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  • Bobcat 225g plus hertz

    I've been checking my welder by the ac plugs keeping it close to 120volts with meter could you explain how to do it by hertz i use a little tiny tac to check rpm says in manual 3600 + or - 50 I believe I keep it on the low end it's running aright just don't understand hertz thanks what setting on my meter do i use
    Last edited by Kpack; 05-17-2012, 06:19 AM.

  • #2
    Your 150 rpm ish too low, if you measure it via your tiny tac.
    These engine drives run in at 3700 to 3750 high idle

    The true generator measurement is taken in HZ with your meter probes stuck in the 120 aux terminals with the engine adjusted to 62.5hz high idle no load. With around 43-44 hz low idle.

    Yours set the way it is, drops in frequency to less than 60hz when something is pluged into it.

    Plus when you weld the low rpm fudges the weld wave forms, you should be much happier with the welder capability when its adjusted correctly
    Last edited by cruizer; 05-17-2012, 09:13 AM.

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    • #3
      You need a meter that measures frequency-don't know if yours has this function. Down into the range of 60 cycles per second. From the bad ole days-- 1 cycle per second=1 hertz.
      Meltedmetal

      Or you could use an oscilloscope but unless you already have one that's the pricey complicated way to go.
      Last edited by Meltedmetal; 05-17-2012, 10:56 AM.

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      • #4
        Bobcat 225 hertz

        Thank you i am going to work on setting it right

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        • #5
          Bobcat

          Hey cruiser read miller manual it does say 3700 RPMs but in onan p216 manual says 3600 RPMs maybe that's we're I got it I've got it set now over 3700 have not welded with it yet thanks

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          • #6
            Bobcat rpms

            Hey cruizer we talked awhile back about setting the rpms up to 3750 rpms I did it and it did weld better thanks

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            • #7
              I bought a newer bobcat with a Subaru engine and they had it set right on 60 hz and it would blow some holes. I reset it to 62.5 and it welds a lot better.
              I wonder why they don't set it like this at the factory ?

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              • #8
                Originally posted by Kpack View Post
                I bought a newer bobcat with a Subaru engine and they had it set right on 60 hz and it would blow some holes. I reset it to 62.5 and it welds a lot better.
                I wonder why they don't set it like this at the factory ?
                I can't answer this question, though at 60HZ, you'd be blowing boards (if you had boards, bobcat doesn't), and have an inconsistant arc at best. Lincoln sets them way high and Miller often too low. Maybe this is to keep the repair shops busy.

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                • #9
                  Bobcat 225g plus hertz

                  Cruizer; I have 1988 area Big 40 Diesel
                  Ser. # JJ404151 has Stanadyne injection sys. I think manual said set to 1850 rpm. Had pump rebuilt couple month ago & ask them to set to 1850 rpm. I installed & timed myself but hv not cked rpm. Welds fine but how do u recommend fine tuning this machine.
                  Thx Greg

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                  • #10
                    60.5hz measured at the auxillary 120 vac terminals

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                    • #11
                      Bobcat 225g plus hertz

                      Thank you. I'll check it out.
                      Thx Greg

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                      • #12
                        Bobcat 225g plus hertz

                        Cruizer friend gave me his hertz meter. Cked and Big 40 running at 62.0 - 62.1 (high) will adjust today.
                        Question my low idle seems high also? Can I adjust with hertz or do I need tach.
                        Thx Greg

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                        • #13
                          A two pole alternator will produce 60 HZ at 3600 RPM (60 HZ X 60 seconds in a minute) I'm not familiar with the governor on these machines, but most AC loads will do fine at anything close to that speed. If weld performance is improved go for it. Servicing generators (Generac) I use a mechanical tach on the generator shaft, or on a motor shaft running no load.
                          Dynasty 280DX
                          Bobcat 250
                          MM252
                          Spool gun
                          Twentieth Century 295
                          Twentieth Century 295 AC
                          Marquette spot welder
                          Smith torches

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                          • #14
                            I think Briggs offers a tach that measures vibration.
                            Dynasty 280DX
                            Bobcat 250
                            MM252
                            Spool gun
                            Twentieth Century 295
                            Twentieth Century 295 AC
                            Marquette spot welder
                            Smith torches

                            Comment


                            • #15
                              All engine driven welders ,and I MEAN ALL, are set via frequency measured at the auxillary terminals NOT via a tach or what ever other measurement (except for the likes of a SA200, which sits around the 107VDC mark NOT 98 as posted on the data plate)
                              Last edited by cruizer; 05-22-2014, 01:17 PM.

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