Citizen A20 dual check safety, safe test over time alarms
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  1. #1
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    Default 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
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    Is your 24V solid?


    -------------------

    Think Snow Eh!
    Ox

  3. #3
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    I think you might have drive problems

    Attached Thumbnails Attached Thumbnails sv0488.jpg  

  4. #4
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    I would start with OX's suggestion of the 24 volt system

    1st check your knock out sensor
    2nd look at you low coolant sensor
    3rd there is a 1amp fuse on the small circuit board on the left hand wall of the electrical box

  5. #5
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    Default

    Most likely one of your door switches is the fault, if they are open during start up the machine will throw those alarms (with the exception of the X1 over travel, that's unrelated).

    If the doors appear to be closed, check the small brackets that hold the keys, mine have cracked over time and failed to get the key into the switch all the way reliably.

  6. #6
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    Good morning all,

    thanks for the input! Did finally get it to come on, and have left it on since. So far the 24v seems solid, its reading 25.18 consistently at the output source. Coolant sensor, door switches, and the 1amp fuse are all good. Machine does not have a knockout overload sensor attached. Does anyone know what all is in this test circuit? Or at least know where to look it up? Are there any screens on the control that could give me a hint? If i remember right, these controls have hidden menus and I don't recall how to access them. ALL input is appreciated !!! THANKS!!

    Also, if it matters, it is a Fanuc 32 I series

  7. #7
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    Well, IF it's a Fanuc front end, AND the newer ones are the same as a 20+ yr old unit - then you would hit:

    SYSTEM on the keypad
    PMC soft key
    PMC LAD soft key


    ------------------

    Think Snow Eh!
    Ox


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