sm74 di issues need help

Discussion in '4-Color Offset Presses +' started by CajunCowboy, Jun 12, 2020.

  1. CajunCowboy

    CajunCowboy New Member

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    We are currently running a sm74 di, The press will not boot without the imaging computer. We are using a platesetter so we really do not need the unit. There is a variant code to turn on and off the di portion. When we do it comes up with a dynamic fault red cannot run press. There is no location and nothing in service menu. We really want to disable this. If there is anybody that could help with this issue I am willing to pay a bounty. Thanks in advance.
     
  2. CHOCK

    CHOCK Senior Member

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    Hi sir:
    Hope you are well.

    If a malfunction occurs in the initilization phase, the detected Init-Error is displayed on the main control
    panel.

    Press operation is no longer possible.

    Can you send me a Pic what show in the imaging computer??

    In short, you must test first: 1) the power supply in the input of main transforme(primary winding)

    2) secondary winding of the main transformer, must be in 10% of tolerance up of down.

    3) if are o.k test the input and output of the GSM (bridege rectifier for to differents modules of machine) likr +48Vdc for G11+G12, use the schematic diagram.

    Let me know, if you have cptronic compact??

    Blessing
     
  3. mrheidelberg

    mrheidelberg Senior Member

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    74
    74 DI will NOT be Cptronic compact
     
  4. PWInc

    PWInc Member

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    Was this fixed? What does it show in the screen? What is the software version of CP2000 and IPC version of computer, MC-xx-xx..? Can you share a picture of the problem?
     
  5. CajunCowboy

    CajunCowboy New Member

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    The press will boot just will not let you do anything, No error di error. When we fixed di raid it all works fine.
     
  6. PWInc

    PWInc Member

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    I thought you were getting a dynamic test error when you turn off the DI variant code. Again, what is the dyn test error you're getting when the DI variant code is turned off ? What else was done or have been tried to disable the imaging section?
     
  7. CajunCowboy

    CajunCowboy New Member

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    All I want to do is turn off imaging and run free sanding. We use a platesetter now.
     
  8. PWInc

    PWInc Member

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    It can be done and was already done before.
     
  9. CajunCowboy

    CajunCowboy New Member

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    Who could I contact?
     
  10. PWInc

    PWInc Member

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    I can but I'm in Canada so travel is out. There must be somebody in States that has fine this before. Most ex-Heidelberg electrician must have known this.
     
  11. PWInc

    PWInc Member

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    There must be somebody in States that has done this before. Have you asked Heidelberg?
     
  12. Mathew

    Mathew Senior Member

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    Are you still struggling with this issue?
     
  13. satq

    satq Member

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    anyone can help me.....i want to bypass air sensor for sm-74
    can anyone tell me how i can do it
     
  14. CHOCK

    CHOCK Senior Member

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    Hi sir;
    Please do it in this way;

    1) If your machine is cptronic compact the pneumatic sensor for SM 74, go to the page # 4 in his schematic electrical diagram.

    2) Attached my schematic how to Bypass the pneumatic sensor.

    Good luck.

    Blessing
     

    Attached Files:

  15. Mathew

    Mathew Senior Member

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    No, no. Don't do that. You may damage the board.
    Dear Chock,
    Pressure sensor on SM74 machines is not a contact, it's transducer. First of all making a bridge over this sensor is not right way and recommended. Second and only for technicians and just for diagnosing the issue, a 10K poti should be connected to the wires to check the actual values.

    Good luck,
     
  16. CHOCK

    CHOCK Senior Member

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    Hi, a transducer is simple electronic switch, that sense the motion, and other.

    You can do that ,sir

    Blessing
     
  17. Mathew

    Mathew Senior Member

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    No, that's not correct. Transducers work as Current variable component. If you check the datasheet of pressure sensor you will see the current out put is 4-20mA.
     
  18. swilson513

    swilson513 Member

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    I find this thread very interesting as we are running a converted sm74\6c 2003. The transducer went out and a new one was ordered and replaced yesterday. Here comes the odd part, the new one did not work as expected. To get it to work the electrician plugged the electrical plug into the old transducer and used the new part to basically just bypass the block or at least I think that's the way I'm looking at it. See attached picture. The press is running but it can't be right or we could have put a brass plug it. image_6483441.JPG
     
  19. CHOCK

    CHOCK Senior Member

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    Great sir .

    Blessing
     

  20. Mathew

    Mathew Senior Member

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    Dear Swilson,
    It's good to hear that your machine is running. As you said also, it's quit strange. Just to be in safe side, do the following instructions and return back to us with feedback.
    To assure transducer functions properly, you have to check the respective analogue value. To do so, press service tab, press configuration and actual values tab, then select V/A and with two arrows on the bottom find a menu where there are values indicated with "I" on the left column. I_4 is for air pressure transducer. On the row, there are three values. From left to right they are related to min-average-max. Check these values once pneumatic compressor is not running or there is sufficient air pressure in the machine. You should see values between 17-20 for average and max. You can also check the indicating gauge in below of transducer. Then try to relief air from the regulator and at the same time check the average value. If the value drops, transducer is responding and functioning properly. If the value doesn't change, it means SAK2 module which converts these values is damaged.
    Send a photo from analogue inputs as well.

    Good luck,
     
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