Polar 55 EM Cutter weird backgauge fault

Discussion in 'Cutters and Trimmers' started by superstardeejay, Dec 22, 2010.

  1. superstardeejay

    superstardeejay Member

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    Hi, we have a Polar 55EM we have a strange problem with the backgauge display/controller.

    The cut position readout is accurate, and we can cut in full-manual, but if we type in a cut position and ask it to move to that position, the backgauge goes fast first, then slow approach, then stop as it should; however the position readout (big LED on the right) and the required cut readout (small LED on the left) don't match!

    For example if we type in a cut of 100.00 then press 'go' (* key then enter-enter) the backgauge will move to 117.57 and stop, then bleep and the display flashes an error.

    If we type in a cut of for example 50.00 then the backgauge will move to 67.57. etc.

    The error is always more or less consistently out by 17.57mm between the two readings; the actual position display and the actual cut that it makes concur if we measure with a ruler.

    The display always flashes and beeps when it over-runs.


    This is a weird one, can anyone help out?

    Thanks,

    Kevin
     
  2. panos greece

    panos greece Member

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    there is a trick to cancel the wrong measure first type 10 cm when its stop push the the button to move the backgauge back dont type,,,,,push the button and while is moving turn off the machine.....restart the machine after a while
    dont forget the oil in the backgauge
    thats for start .............if the same happen you need to check the sensor down of the backgauge ..........not easy.......you must call for assistant from an expert near you
     
  3. superstardeejay

    superstardeejay Member

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    Hi Panos
    The backgauge will not accept any value less than 50cm because that is the minimum cut
     
  4. panos greece

    panos greece Member

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    sorry for my delay to answer but i work 2 jobs and i have not free time anyway..............
    the mimimum cut of your machine i think is 9 cm my friend
    anyway put your machine manually to the minimum cut and after push the button to move the backgauge to the maximum cutting position ......while is moving switch off the machine ....... switch on............ after that the machine has reset no indicates ..............you need to push the manuall button backward or forward for the backgauge
    to find for new the true measures if not ............you need assistanse and may spare parts
    happy christmas...........
     
  5. exceed engineering

    exceed engineering New Member

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    i think you are mixed up with cm and mm,normal display for Polar 55 is mm,
    dependant on age of your machine the above will not work.
    If when you first turn your machine on,you need to run the backguage back to get a size on the display the above advice will not work.
    if however when you turn your machine on it has retained the last entered size the above advice will work.
    We specialise in service/repair of Guillotines and i would guess at
    1,if the fault has just appeared it will be either an encoder fault or require the TAM card adjusting
    2,if the machine has always had this fault i would guess it has never been commissioned correctly and requires the TAM card calibrating.
     
  6. superstardeejay

    superstardeejay Member

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    Hi Guys
    The backguage never needs running back to a stop after power-off, it always remembers where it is. The memory is backed up by lithium battery and the calibration is via rotary switches under the front plate. The battery is ok (3.7V) and the switches have not been altered.
    This is a fault that started happening suddenly.
    The fault is the left 'cut' display and the right 'position' display dont match after the backguage has moved to its new position. The 'position' display matches the cut depth when measured with a ruler. So to get a proper cut, we have to type in the wrong value to allow for this.
     
  7. panos greece

    panos greece Member

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    i think that i write a trick its up to you......................in the factory i work a problem must solve in hours not days or weeks
    anyway.......i like to help.............
     
  8. exceed engineering

    exceed engineering New Member

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    sounds like maybe the switch off position has been altered or the brake is sticking ???
    the machine must think its within tolerance,otherwise it would not allow the cut,you would have to switch into manual to complete the cut.
    have you tried knocking the isolator of when the backguage is running and getting the machine to recalibrate ?
     
  9. mightyandy

    mightyandy Senior Member

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    50cm is half a metre this can't possibly be the minimum cut
     

  10. superstardeejay

    superstardeejay Member

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    sorry thats a typo (obviously). 55mm is the minimum cut, it was adjusted by the last engineer to 50mm a few years ago.
     
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