SM 52 Delivery pile fails to raise

Discussion in 'Heidelberg Printing Presses' started by arkprint, Jun 8, 2024.

  1. arkprint

    arkprint New Member

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    Location:
    Ukraine
    Hello all,
    The delivery pile on our sm52 recently stopped working correctly. The only way to raise the delivery pile is to lower the feeder pile the whole way, idle the press, and engage the feeder. While the feeder pile is rising automatically, repeatedly pressing the delivery pile up button raises the delivery pile in tiny increments. Otherwise it won't rise at all. The limit switches seem to be working and the delivery pile lowers automatically as it should when printing, so I assume the top of delivery pile height sensor is working.
    Any ideas?

    Thanks in advance!
     
  2. CHOCK

    CHOCK Senior Member

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    Hi Sir:

    I strong recommend to review + and test the following Limit Switch + Sensors, for loose, wires, dirty, lack of voltages, or Faulty and Replace it.
    12S33 Upper main pile limitation
    12S34 Bottom main pile limitation
    12B35 Upper edge of pile Receiver (light barrier)
    12B35a Upper edge of pile Transmitter (light
    barrier)
    12S38 Overshooting control
    12S41 Pile stop
    12S42 Pile down
    12B122 Automatic pile height control


     
  3. arkprint

    arkprint New Member

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    Thanks very much for answering. The function of these switches seems correct, except for 12B35 and 12B35a, which I can't seem to find. Maybe this press doesn't have them?? As far as I can tell, the only sensor for top of delivery pile position is the 12B122. I did discover that if I insert the fork for nonstop delivery cart change (triggering both 12S41 and 12S42) everything works as it should! Does this sound like a problem with 12S41 or 12S42, or does it sound like a workaround covering up another problem?
    Thanks!
     
  4. CHOCK

    CHOCK Senior Member

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    By that reason, test it.

    Always there are some the same problem, limit switch or sensors.

    Good luck

     
  5. Adil

    Adil Senior Member

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    Hi sit
    sir the lateral tabs there is a sensor, clean it and ensure that the tab on the tab is not blocked, as chock said this type of problem is mainly due to dirty or defective sensors, alignment of the sensors
     
  6. CHOCK

    CHOCK Senior Member

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    Remember, test the regulated power supply!! .in tolerance!!
     
  7. CHOCK

    CHOCK Senior Member

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    Test the regulated power supply, in tolerance.

    Blessings
     
  8. arkprint

    arkprint New Member

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    Thank you both, Chock and Adil for your help! This puts us on the right track. Very much appreciated!!
     
  9. CHOCK

    CHOCK Senior Member

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    Ok, Sir.
    Blessings
     

  10. Adil

    Adil Senior Member

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    Be welcome .
    Good luck
     
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