EBA 721-06 LT 2013 Guillotine Technical Issue

Discussion in '4-Color Offset Presses +' started by Shuka, Mar 7, 2023.

  1. Shuka

    Shuka Member

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    Hi all

    I don’t know this machine problem can ask here or not,

    facing a technical issue on our machine.
    EBA 721-06 LT GUILLOTINE SL NO: B 6374798 Y2013


    Problem 1: knife not coming down
    Problem 2: after trying to cut with two push buttons, the back gauge does not move forward.

    Details of problems and observations:
    After Power ON, press start button, initialisation could complete and stop at position 72cm as like normal operation, this time back gauge can move front and back many times without any issue,
    When we try to cut with two push buttons, two problems occurs

    Problem 1: Knife does not come down, insted we can see the knife motor(M1) gear rotates clockwise. ( main gear not getting engaged with motor shaft gear)
    We checked that the power of Y2 solenoid is getting 24v.

    Problem 2: after try for cut, back gauge cannot move forward by entering sizes, but it can move backwards by entering sizes.

    At the same time we realized the hydraulic oil was empty, so filled hydraulic oil upto max level. but no improvement.

    Safety light guard, right side is green and left side is always red, when object detects, the right side LED turns to RED, hope it is normal, Relay K11, K12, K13 and K14 are getting activated by keeping a hand between the safety light guard.

    Please find below photos and videos for your understanding.
    Could you please help us to solve this issue ASAP.

    With Regards
    Shuka
     
  2. CHOCK

    CHOCK Senior Member

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    Hi sir;

    I believe after check his commentary about status Paper cutter;

    1) Must fill the hydraulic recipient with properly hydraulic oil, according his operator manual , ordered by the manufacturer.

    2) Bleed the system for air, this WILL be Interrupt the knife +Clamp is down......!

    3) Look for any leak in the hydraulic system, in order to seal very well, or replace some part, like Hoses, O ring , Retainer, or Included hydraulic pump( if have ).

    4) If after the hydraulic was tested o.k , if the problem persist, you must test the Y2 +y3 solenoids, for defective ! 24Vca must be arrive to the coil from any Solenoids( possible winded) can be reheating, NOT burn, by use Normal.

    5) Test and clean all contacts for K2+K3 for wear, and replace, tight very well +clean all connections, for loose, and oxide in the terminals.

    6) The backgauge motor, Will not move until the defective for Knife+Clamp will be fix it. Must be sure, the backgauge motor work with +24Vdc !
     
  3. Shuka

    Shuka Member

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  4. Shuka

    Shuka Member

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    Hi Mr. Chock

    Thanks for your detailed reply, Back gauge problem and knife problem have sorted out, position sensor was the reason.

    Existing issue is, clamp pressure, not enough even after adjusted the adjusting knob.
    In hydraulic tank, oil level was below minimum.
    So I filled with available hydraulic oil 37, instead of Shell tellus C32 as mentioned in the operation manual, photo attached.
    It could be the problem? (Y2 & Y3 solenoids are working)

    I have tried air bleeding in all connection points.
    There is no pressure pump, pressure generating is by piston cylinder, need to add oil inside? Could be air inside,? Please see the attached photos

    Thanks in advance
     

    Attached Files:

  5. CHOCK

    CHOCK Senior Member

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    Ok:
    1);test Y2+Y3x possible defective

    2) however bleeding hydraulic air in all points, must be checking.

    3) hydraulic pump, must be test with Manometer x how many Bars vs ID plate in hydraulic.

    Blessings .
     
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  6. CHOCK

    CHOCK Senior Member

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    Fix it sir?

    Let me know

     
  7. Shuka

    Shuka Member

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    Not yet Sir,
    Let me change the hydraulic oil and check
    (I couldn’t attend the machine today)

    Shell tellus C32 is the mentioned oil in the book.
     
  8. CHOCK

    CHOCK Senior Member

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  9. Shuka

    Shuka Member

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    Changed hydraulic oil and air bleed done in the piston cylinder, now clamp pressure getting perfect..

    Thank you for support..!!
     

  10. CHOCK

    CHOCK Senior Member

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    Great job.
     
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