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  1. #1
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    Oct 2009
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    4

    Mitsubishi wired edm alarm

    Getting an alarm.. U796 Over run. PLEASE HELP

  2. #2
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    Jan 2009
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    64
    The alarm points to either a broken wire on an axis stroke limit or if this is a CX machine or similar it could be a SIFA card problem

    HTH

  3. #3
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    Oct 2012
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    7

    some help

    i'm having the same alarm on my fx20 any sugestions??

  4. #4
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    Jan 2009
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    64
    Hi, We have 8 mitsy EDM wire machines here. They've had all symptoms. Check the alarm page for which axis it points to! then you can simply find the cable. My bet is Y axis and the cable runs along the length of the machine and has probably got trapped and cut through. At the worst the SIFA card in the NC cabinet needs attention this could cost around £500-£800 (£1000-$1500) to repair. If you can't find a broken cable you'll need a service engineer to diagnose. HTH

  5. #5
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    Feb 2009
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    51
    If on the alarm screen the alarm tells you all axes are overrun, look at the PD21B in the control cabinet, is the red LED on at the top of the PD21? if so, disconnect the grey honda connector on the MW712, does red led go off? if so then it is definitely on the machine or the SIFA PCB? Let me know what happens.

  6. #6
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    May 2011
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    29

    Re: Mitsubishi wired edm alarm

    We have a FA20s i am getting same alarm. I have taken all the covers off, none of my 5 switches are hitting. All wires look good back to electrical cabinet. Any suggestion.

  7. #7
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    Feb 2009
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    51

    Re: Mitsubishi wired edm alarm

    It could be the fuse on the UPS pcb, do you know where that is situated?

  8. #8

    Lightbulb Re: Mitsubishi wired edm alarm

    So, I also got this problem on Mitsubishi FX20. At one point, I got an error u796 Over run. I tried all the tips in this thread, but nothing worked.
    I tried to fix it myself and it worked. In my case, the contact group was exposed at the back of the machine, and pieces of wire fell on it. I blew everything with a pneumatic gun and the error disappeared.

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