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IndustryArena Forum > Machine Controllers Software and Solutions > Fanuc > Citizen A20 dual check safety, safe test over time alarms
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  1. #1
    Neuer Benutzer
    Join Date
    Jan 2013
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    Citizen A20 dual check safety, safe test over time alarms

    Hey all,

    I have a Citizen A20 that will randomly throw up the following alarm when first powering up and they will not clear....Sure hope someone can help !!!

    OT0501 (X1) - OVERTRAVEL (SOFT 1)
    SV0488 SAFE TEST OVER TIME
    SV1068 DUAL CHECK SAFETY ALARM
    EX1000 EMERGENCY BUTTON PUSHED

    So far i have checked all the door switches and all the e-stops... all seem to be working...ANY IDEAS ?!?!?!?!?!

    THANKS !!!

  2. #2

    Join Date
    Aug 2019
    Posts
    69

    Re: Citizen A20 dual check safety, safe test over time alarms

    The 488 and 1068 alarms relate to the MCC off test. Parameter 1946 establishes the time limit.
    The EX1000 in conjunction with those alarms is concerning as the MCC contactor should not be tested if in emergency stop. But that also depends on the timing of when the listed alarms are displayed.

    Use caution in changing parameters related to dual check.

  3. #3
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    Re: Citizen A20 dual check safety, safe test over time alarms

    The alarms occurred in the reverse order listed in my post. I checked the function of the e-stop, and it is working. To my knowledge, there is only the one on the machine. There are two on the barfeed, but the CNC hasn't even sent power to the barfeed at this point, so i doubt they could be at fault. Any ideas what else could be sending a bad signal? Feel free to break it down kindergarten style, because this is an area of the machine I am not familiar with at all.

    THANKS!!

  4. #4
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    Dec 2009
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    698

    Re: Citizen A20 dual check safety, safe test over time alarms

    what type of Fanuc is?
    what is the status of the G8.4 or X8.4?
    The barfeeder ,een it has no power,must be a short between the 2 pns to bypass the emergency and alos all the hard limit switches from the axis are also in the emergency circuit so when an emergency is on do not look only for the emergency psuh button,can be more on the circuit.

  5. #5
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    Feb 2011
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    352

    Re: Citizen A20 dual check safety, safe test over time alarms

    check for a short in the 24 volt system
    most likely in the knock out overload sensor
    also check the coolant low level sensor if it's not the knock out sensor
    there is also a 1 amp fuse on the small circuit board left side of the electrical panel

  6. #6
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    Jan 2013
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    10

    Re: Citizen A20 dual check safety, safe test over time alarms

    Fanuc series 32 I. Coolant level sensors is working, prox switches for knockout are working, this machine appears to not have a knock out overload sensor... we check the 1amp fuse every time...always good. And to clarify, this happens randomly and sometimes you can turn it off and right back on, and sometimes you can do it 50 times before it finally comes on with no changes to anything.....definitely pulling my hair out !!!!!!

  7. #7
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    698

    Re: Citizen A20 dual check safety, safe test over time alarms

    there is a menu for dual check safety inputs/outputs
    when alarm occurs you should check that page and see what signal is not on ,the left and right colums should show the same bits,if one is not the same like other colums,start from that input/output value

  8. #8
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    Re: Citizen A20 dual check safety, safe test over time alarms

    That is good info!! Thanks! Any idea where i can find this menu?

  9. #9

    Join Date
    Aug 2019
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    69

    Re: Citizen A20 dual check safety, safe test over time alarms

    Under "SYSTEM". Press the chapter key until you see "DUAL CHECK"

  10. #10
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    Jan 2013
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    10

    Re: Citizen A20 dual check safety, safe test over time alarms

    Attachment 471342

    So, i believe i found the menu. (pic attached). As of right now the machine is powered up, and the only one on the list that is showing anything odd is X0008. Bit 7 is different, and bit 6 is bouncing back and forth. Does this mean anything to anyone?

    THANKS!!!

  11. #11
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    Re: Citizen A20 dual check safety, safe test over time alarms

    look in the electric diagram to what is assigned X8.7 but i am guessing is the door keylock

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