'84 QT20, T1 powering itself off randomly.
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  1. #1
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    Default '84 QT20, T1 powering itself off randomly.

    Sunday I was indicating some crappy part in on the lathe, and it just powered off... The turret dropped and squished my indicator...

    Powered it back on, and it powered off, then again, then again... Then it was fine, then it powered off again.... Then it was fine
    for a few hours and then it did it one more time later on... Haven't needed it since...

    When it did happen, nothing special was happening... No thunderstorms(that I saw), never dropped out in a cut.. If there was some funky
    power surge it didn't effect any other machines or computers, or the TV... If there was a short power blip the TV is usually the
    first to shut off.... I won't discount the power blip.. It is summer time, and there is a thunderstorm somewhere close almost constantly.

    Anyways... My plan is to run her here again and see if it happens again.....

    What I'm asking is if there is a common failure or common point(crappy relay?) that would make this happen? Before I start chasing power
    wires and swapping breakers, all the while hoping to not dig deeper into the machine.

  2. #2
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    Quote Originally Posted by Bobw View Post
    Powered it back on, and it powered off, then again, then again... Then it was fine, then it powered off again....
    Exactly HOW did it power off? Did the machine trip the main breaker or did it act like someone pushed the off button on the control?

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    Quote Originally Posted by Philabuster View Post
    Exactly HOW did it power off? Did the machine trip the main breaker or did it act like someone pushed the off button on the control?
    Just like somebody hit the "power off" button on the control... Nothing tripped... Hit the green button and it came right back up, then right back down, then up,
    then down... Then it stayed on for a few hours, then down again, and right back up for a few hours, and then we all went home.

  4. #4
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    failing nc power supply is my first thought

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    On my rotary phase converter, before I swapped the phases around, my QT10 would "power off" under heavy load. The problem was that the control power was coming from the manufactured leg and one of the regular legs. Once I moved the phases so that the control power was only hooked to the two normal legs it never did it again. I suppose that I could make some adjustments to my phase converter, but I really don't want to have the no load voltage way high.

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    Update,

    The powering off issue only happened that one day, I haven't run the machine a whole lot since then, a little thing
    here, a little thing there. Last week I ran her 3 days straight with no problems...

    Weird.

  8. #7
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    My T1 did this a couple times in the past week. Anybody else ever see this? Bob did you ever find out what was causing it? Thanks.

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    Anybody else have any suggestions? This is happening to me now once or twice a day. I've checked power supply voltages, re-seated the power on ice-cube relay, tightened all the line connections into the machine. Still doing it occasionally. Only seems to be while in auto with a program running. What else should i check?

    Where are you Bobw? Would love to know what happened to your machine after.

  10. #9
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    Make sure all the fans in the rack of boards for the control are running at full force.

    Next I would swap power supplies for the control.
    My experience starts with T/M-2 controls, and I have replaced several in those machines for the same problem.

    P.S you do not have any location in your setup.

    Bill

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    All the fans seem to be running fine. I did get the machine to shut down once by tapping the electrical cabinet, which seems to suggest a loose connection somewhere. I've wiggled all sorts of wires/connectors trying to find whats loose with no real luck. Machine hasn't shut down in the past 3-4 days. Maybe I improved the poor connection slightly while looking for it? I guess I will have to wait for it to show up again and look for it then.

    Bob, looks like your back online now, any update on what happened to yours?


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