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Thread: push button contact

  1. #11
    Join Date
    Apr 2017
    Location
    Ulsan, Korea
    Posts
    3

    Tank for reply

    Quote Originally Posted by petersonra View Post
    How often does this happen?

    It could be that you are using poor quality contact pushbuttons. If so, changing to a better quality of pushbutton may solve your problem.

    Maybe there is some environmental factor that is causing the failure. Could be corrosive fumes, even vibration. Maybe sealed contact blocks would help with corrosion. Vibration is a little tougher but you might be able to find mounting locations that are less susceptible to vibration.

    It could also be that you are using them outside of their ratings, although that seems unlikely.

    Without more information it is hard to give you any good advice.

    I don't know how going to some kind of voting scheme is going to solve the failures. Better to fix the problem than to mask it.

    I dont think it happen much, maybe once a 5 years even though we have huge amount of push button swich in our site.
    I know voting scheme is not a best solution and cannot apply all of push button considering efficiency but it can be reduce failure rate.
    As you mention above, we are trying to mitigate environment factor to push button, for example, exmergency stop switch is hard to do maintenace during normal operation.
    More, if it' faiure could happen, we are going to lose alot of money on refinery plant characteristic.
    If you have any experience with that kind of matter, I would love to share the best practice or let us know if you know where I can refe to code/standard.
    I think if we apply voting scheme for pushbutton, we must set criteria up considering engineering effiency.


    Please let us discuss and I want to be always with you as engineer.

    from Korea

  2. #12
    Join Date
    Dec 2007
    Location
    NE Nebraska
    Posts
    30,820
    Quote Originally Posted by webfst View Post
    I dont think it happen much, maybe once a 5 years even though we have huge amount of push button swich in our site.
    I know voting scheme is not a best solution and cannot apply all of push button considering efficiency but it can be reduce failure rate.
    As you mention above, we are trying to mitigate environment factor to push button, for example, exmergency stop switch is hard to do maintenace during normal operation.
    More, if it' faiure could happen, we are going to lose alot of money on refinery plant characteristic.
    If you have any experience with that kind of matter, I would love to share the best practice or let us know if you know where I can refe to code/standard.
    I think if we apply voting scheme for pushbutton, we must set criteria up considering engineering effiency.


    Please let us discuss and I want to be always with you as engineer.

    from Korea
    Switch built to higher specifications sounds like a start, presuming you aren't already using what you have beyond it's design specifications. Most of the 30 mm switch designs seem to take more abuse then 22 mm switch designs when it comes to general purpose pushbuttons and their associated contact blocks.

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