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Thread: screen 8300s ctp take very long time load particular size of plate.

  1. #1
    Junior Member gerbercage is on a distinguished road
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    screen 8300s ctp take very long time load particular size of plate.

    Recently the CTP take long time load 510x400mm plate compare to last time. (The longest will be 1 minutes)
    Normally when the CTP running other size of plate (let say 670x560mm) after that if next job is not this size, it will have to adjust according to plate size and then load it then punch then start imaging.
    But now when putting 510x400mm size, it take quite long to adjust the size before it can start imaging. (I suspect it keep adjusting to correct plate size but fail then it auto retry again and again. Then the louder sound-I think is clamp keep open and close then adjust plate size again)
    So far no error code out. After loading and imaging it, the next 510x400mm that it load will not have this problem(because the size correct already, it just punch hole, clamp it then start imaging.)

    So far if I load other size such as 525x459mm, 650x550mm, 670x560mm, 1030x800mm.... and so on, none of these need to take that long to adjust, clamp, punch hole and load. Only face this problem for 510x400mm plate. Last time this size also don't have problem(for 9 years)until now.

    Anyone can know what is the problem? Is that related to this plate 510x400mm which one edge of it a bit lighter cyan coating compare to other area which make the ctp cannot check out the correct size? or ctp sensor got problem for this size?

  2. #2
    PRC Member saifou will become famous soon enough
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    try to center your plate correctly in table before loading , if the problem perciste you have problem in centering cable sensor

  3. #3
    Junior Member gerbercage is on a distinguished road
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    Quote Originally Posted by saifou View Post
    try to center your plate correctly in table before loading , if the problem perciste you have problem in centering cable sensor
    Someone just tell me it related to balancing problem. It stuck at balancing.
    Anyone know how to clean it at there?

  4. #4
    PRC Member saifou will become famous soon enough
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    this is true balancing can cause delay in that case try to clean bancer sensor
    Last edited by saifou; 04-24-2019 at 07:25 AM.

  5. #5
    Junior Member gerbercage is on a distinguished road
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    Got any photo show out where is it?

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    PRC Member saifou will become famous soon enough
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    sorry the upload manager refuse to add photo

  7. #7
    Donor trafs is on a distinguished road
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    This can be related to balancing. There are two counterweights on the each side of drum. When plate size changes, balancer relocation program is executed and counterweights are moved one by one. Open the side cowers and electronics cabinet to watch the progress. You can check the counterweights and move by hand too - they should be moving smoothly, but stay in place firmly once left (they are fixed to drum by magnets embedded in bronze weights). Probably you need to clean the groove. And probably the plastic bushing are worn out, and you need to replace the counterweights.

    Blue colored stripe on plate edge on bottom side is remains from aluminium roll production. It can be problem for plate detection sensor in rare cases, but then the plate will not be detected correctly at all. Then you can turn plate 180 degrees, and probably it should go (edge detection sensors are different in front and trailing edges).

  8. #8
    Junior Member ng_quen is on a distinguished road
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    It could be from the balancer.

    Other way, I think you can fix by declaring the plate size with some tolerance.
    510 +/- ( 0.1--->0.5 ) x 400

  9. #9
    Junior Member gerbercage is on a distinguished road
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    Quote Originally Posted by trafs View Post
    This can be related to balancing. There are two counterweights on the each side of drum. When plate size changes, balancer relocation program is executed and counterweights are moved one by one. Open the side cowers and electronics cabinet to watch the progress. You can check the counterweights and move by hand too - they should be moving smoothly, but stay in place firmly once left (they are fixed to drum by magnets embedded in bronze weights). Probably you need to clean the groove. And probably the plastic bushing are worn out, and you need to replace the counterweights.

    Blue colored stripe on plate edge on bottom side is remains from aluminium roll production. It can be problem for plate detection sensor in rare cases, but then the plate will not be detected correctly at all. Then you can turn plate 180 degrees, and probably it should go (edge detection sensors are different in front and trailing edges).
    yah, finally I found it. It work well after I clean that area. Thanks

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