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Voltage dump for diy cnc, larken dr.

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  • Voltage dump for diy cnc, larken dr.

    I have read some of David's posts on building an excess voltage dump. I’m looking for a link or some info on building one.

    I think it has a zener, transistor, resistor? I’m striving for 70vdc so a 75 to 80v zener? I’m not sure how many amps will be created during de acceleration? I have a bunch of replacement transistors for the original drives, will these work if needed?

    I’m converting the BP boss5 to Mach3, and Larkens. I found a nice toroid and rewound the secondary to get 50v ac in series. It came out of a bat. charger I think. The original secondary was 12x14guage wires x2 at 20vac. I ended up running 4x14guage wires 25 turnsx2. It worked out perfect 25v on each.
    In it’s original condition.


  • #2
    Goto the Geckodrives group on Yahoo, look in files and select the folder on 201 and 210 drives.
    there are some in there that are built and proven.

    http://finance.groups.yahoo.com/grou...%20and%20G210/

    You will have to sign up for the group.

    Sir John.
    .

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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    • #3
      Much thanks John.

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      • #4
        > de acceleration?

        There is a perfectly good word deceleration,
        the opposite of acceleration. There is no need
        to do what a former president did with the
        word escalate. :-) :-)
        ...lew...

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        • #5
          I got a cube relay right now. ( is on back side of rectifier) It dumps through a finned resistor from the original boss hardware. Zener. Hopefully on-time will be sufficient to dump before overvoltage is achieved. The Larken drives are very forgiving and tough.

          I lost a drive. TUrbocnc was pulsing the cube relay turning power on and off. I did it in the configuration. Too damn many cnc programs and config files.

          I have had one on order now for two weeks. WHen the new one arrives I'll look into doing the repair on the old one. No smoke, no burned chips, I guess it is the fixed control voltage regulators on top of the board. I have not looked yet. Too many thing on my mind.
          Excuse me, I farted.

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