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  1. #1
    Nick H is offline Aluminum
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    Default Fanuc OT controller buttons randomly not working.

    Several buttons and switches on the Fanuc OT controller randomly stop working and randomly start working again from time to time. At first it was only the "coolant on/off/auto toggle switch. After a while the "jog" buttons have stopped working at times, and the "incremental feed" toggle switch sometime seems to get stuck in the .01" setting reguardless of toggle switch position. It just seems to come and go as it pleases. Sometimes it works fine for days, weeks, months, them sometimes it acts up for hours or days at a time.

    Any ideas at all what it could be?

    Of course it never acts up when the CNC service tech is here.

  2. #2
    Milacron's Avatar
    Milacron is online now Diamond
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    I had the same trouble on a Fanuc 0M.... it was the buttons themselves. See here-

    Ever have a Fanuc keypad go bad ? I have..

    If I ever have to do this again, next time I'll just pry up the yellow vinyl enough to insert a drop of Stabilant 22 and that will fix it way easier than removing the clickers individually.

    The problem is a very fine film of corrosion on the clickers below the sealed yellow vinyl. How some buttons get that way and others don't, is beyond me. The ones that didn't work at all, no matter how much finger pressure, clicker contact surfaces looked fine...maybe just a slight dullness in finish compared to the ones that worked...wierd but true.

  3. #3
    Nick H is offline Aluminum
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    So it was your keypad that had the problems? What about any of the other buttons, and toggle switches? All of my keypad buttons work flawlessly, never had an issue with those.

  4. #4
    Milacron's Avatar
    Milacron is online now Diamond
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    Quote Originally Posted by Nick H View Post
    So it was your keypad that had the problems? What about any of the other buttons, and toggle switches? All of my keypad buttons work flawlessly, never had an issue with those.
    Oh...I see now you just mean buttons in general, not Fanuc specific buttons..hell, they could be anything then...would be more helpful to know who made the machine, not the control in that case.

    Look at them from the rear...if they happen to be made in Switzerland by EAO you will just have to replace them...Newmark Electronics has them...price is a rip, esp considering they aren't made all that great in the first place...but that's the easiest way out. Hard to believe they make pushbuttons so crappy in Switzerland, but I've had many, many EAO failures.

  5. #5
    cncmek is offline Cast Iron
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    Another possibilty is a bad cable or connection. If the control swings or moves at all you could have a cable going bad.

    Could also be a lose connection on the OP panel.

    You could reseat all the plugs/tighten the connectors and the next time a button stops working you could move/pivot/whatever the control and see if the button starts to work again.

    Dave

  6. #6
    Milacron's Avatar
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    Quote Originally Posted by cncmek View Post
    Another possibilty is a bad cable or connection. If the control swings or moves at all you could have a cable going bad.
    Just out of curiosity, have you ever had a bad cable ? I've troubleshooted hundreds of machines and a cable was never the issue. Except once...and in that case the bad "cable" wasn't really a cable in the usual sense but a paper thin ribbon cable inside a digitial height gauge where the fold over crease in it cause a ribbon break after 25 years.

  7. #7
    alphonso is online now Stainless
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    Quote Originally Posted by Milacron View Post
    Just out of curiosity, have you ever had a bad cable ? I've troubleshooted hundreds of machines and a cable was never the issue. Except once...and in that case the bad "cable" wasn't really a cable in the usual sense but a paper thin ribbon cable inside a digitial height gauge where the fold over crease in it cause a ribbon break after 25 years.
    GE 1050. 4 ribbon (36 wire) cables from control station (operator's panel) to rest of machine. Got so bad, I finally made my own using the connectors and individual wires.

  8. #8
    Nick H is offline Aluminum
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    Quote Originally Posted by Milacron View Post
    Oh...I see now you just mean buttons in general, not Fanuc specific buttons..hell, they could be anything then...would be more helpful to know who made the machine, not the control in that case.

    Look at them from the rear...if they happen to be made in Switzerland by EAO you will just have to replace them...Newmark Electronics has them...price is a rip, esp considering they aren't made all that great in the first place...but that's the easiest way out. Hard to believe they make pushbuttons so crappy in Switzerland, but I've had many, many EAO failures.
    Machine is a Daewoo Pump 10HC, buttons seem to be made by Fuji Electric.
    Back view of the switches.. the cluster with the thick yellow wire.


    One of the switches removed



    Front view of the switches. (the white and yellow rapid, jog buttons)

  9. #9
    Milacron's Avatar
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    Quote Originally Posted by Nick H View Post
    Machine is a Daewoo Pump 10HC, buttons seem to be made by Fuji Electric.
    Back view of the switches.. the cluster with the thick yellow wire.

    OK, Fuji buttons are typically much better than EAO but they can go bad as well. Check resistance between terminals as you press the button and if not near zero, then you know that button needs some attention or replacement.

    I can't remember who sells Fuji buttons but seems like one of the usual suspects has them..maybe even McMaster Carr...or Digi-Key...

  10. #10
    cncmek is offline Cast Iron
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    Milacron,

    Yes, several times I have run across a bad cable, even on newer machines. Usually where the wire takes a sharp bend at the pivot point of the control.


    Nick,

    I have run across, on a few instances, on the Daewoos ( and a few others ) a bad solder joint on the daisey chained neutral (N24) Can be a bummer to find though.

    Dave

  11. #11
    wippin' boy is offline Diamond
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    All World machinery supply
    815-943-9111

    has Fuji buttons at great prices
    just about any other machine tool wijjies you can imagine also
    great supplier
    no relationship

    chuck foot switch cable
    second most common breakdown after
    "I'm sure i hit reset before it just went berserk"

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