Overhead Crane

Discussion in 'Automation & Control' started by jtomrai, Apr 8, 2019.

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  1. jtomrai

    Thread Starter New Member

    Apr 8, 2019
    I have an overhead crane rail/bridge system, with 4 crane rails, 3 bridges, and 2 hoists. This afternoon, one of the crane rails decided to stop working at correct speed in the north travel, only. The south travel runs at full speed. All 3 other crane rails run perfectly north/south as well.
    I am thinking it could be a plc issue, but I'm not sure. Any help would be appreciated.

    Thank you in advance,

  2. Yaakov

    Well-Known Member

    Jan 27, 2019
    Welcome to AAC.

    We'd need a lot more information to be able to help. Do you have drawings of the controller?

    I have concerns about safety, this is a potentially dangerous thing to modify or attempt to repair.

    In any case, we'd need schematics and part numbers, and quite possibly photographs.
  3. atferrari

    AAC Fanatic!

    Jan 6, 2004
    Have even tried to call your service? Sure you know they are no toys precisely.
  4. jpanhalt


    Jan 18, 2008
    Call the crane man. How much would an injured/killed worker be worth to your company compared to a DIY'er who has no idea what happened?
  5. MaxHeadRoom


    Jul 18, 2013
    I have worked on a few overhead gantry cranes, it depends on how old the design is and what type of speed control, from wound rotor AC induction motor to modern AC motor with VFD.
    I assume you have the schematics?
    As already said, quite a bit more info needed.
    Also many that are radio control from a ground operator.
  6. spinnaker

    AAC Fanatic!

    Oct 29, 2009

    It wold be completely inappropriate to troubleshoot via the forum anyway. TS needs to have a qualified tech on site to repair the issue. One wrong mistake and someone could end up being hurt or worse killed. This thread needs to be locked.

    I just wonder if the TS would try to perform surgery via the internet?
  7. MisterBill2

    Distinguished Member

    Jan 23, 2018
    I have serviced an overhead crane and of course there are a few things that can more often go wrong. BUt in this case the very best choice is to clearly identify each of the failure modes and then switch off the power to that crane and contact a service person who understands what they are doing. You will need to be able to clearly describe which functions have the problems, and what those problems are.
    BUT there is an exception, which is that if the cranes are part of a model train layout and use low voltage for the motors and controls. In that case we can possibly help. Those projects can be very interesting and certainly challenging but usually totally safe.
  8. BR-549

    AAC Fanatic!

    Sep 22, 2013
    There are some things we just can't do over the net. Like airplane maintenance. Or an appendectomy on your son or daughter.

    Other than that......we do it all.
    spinnaker likes this.
  9. Tonyr1084

    Distinguished Member

    Sep 24, 2015
    Repairing this will require a skilled, trained and experienced crane service technician. Best I can do with this thread is get somebody killed. And that would not only ruin my day it would also ruin theirs as well. My advice: Refer to qualified service personnel.
  10. bertus


    Apr 5, 2008

    Please hire a professional to have the equipment fixed.

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