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  1. #11
    Quote Originally Posted by Wobbin View Post
    What's the 'brain' function then ? Forgive what may be a dumb question, as I said I'm new to CNC...
    This is the info that Bruce is using for his machine, see the Zip file attachment for the Brains.
    http://www.mycncuk.com/threads/6565-...2213#post52213

    Brains are a feature of Mach3 software, you can get an overview here;

    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  2. The Following User Says Thank You to EddyCurrent For This Useful Post:


  3. #12
    I had an issue with a PMDX A few months ago with prox switches on Home switches (Inputs) not being pulled to ground and the cure was a small resisistor between ground and the pin. It sounds like you are having a similiar thing so worth a try.?
    Last edited by JAZZCNC; 11-07-2014 at 07:05 PM.

  4. #13
    Jazz... close I think.....

    It is now working after receiving an email from Steve @ PMDX. In his email he indicated that I needed to connect the negative from the 24v supply to GND so the transistor had a reference to it. I did that and it works. I now know why Eddy's worked from the start (at least I think I do), his BOB is powered by the same 24v supply as the flasher circuit and therefore the tx already had a reference to the 24v neg side. I am thinking now if I replaced the 24V LED with one suited more to 5v whether it would work without grounding to the supply. However, that would probably be a moot point given that I have a PMDX 126 winging its way to me as we speak and it is powered by 240v.....

    Thanks to everyone who ran around in circles with this, I really appreciate the help given

    Cheers
    Bruce

  5. #14
    Quote Originally Posted by ozspeedway View Post
    Jazz... close I think.....

    It is now working after receiving an email from Steve @ PMDX. In his email he indicated that I needed to connect the negative from the 24v supply to GND so the transistor had a reference to it.
    Ah ah.!! . . . Assumption being the mother of all F'#&up's me and suspect others presumed you would be doing this as it's a given that you must use the same ground for any circuit to work correctly.!
    Last edited by JAZZCNC; 12-07-2014 at 08:33 AM.

  6. #15
    And with me being a follower and not a guru in electronics I managed to completely miss that principle. Lesson learned I can tell ya because now I just feel like a wally :)

  7. #16
    Assumption being the mother of all F'#&up's
    LOL... when I was fixing drives a while back I had that very phrase on a label on my bench to remind me :-)

    No 0v reference - yep, that would do it. We've all been there. Glad you're sorted.

    Cheers
    Robin

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