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Thread: Industrial Overhead Door Control wiring

  1. #1
    Join Date
    Dec 2005
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    Industrial Overhead Door Control wiring

    A customer just installed two, used, Overhead Door openers on his shop building. The motor control is "old school" and I am drawing a blank. The up/down/stop control has a 5 conductor cable to it. I figured out 3 of them.

    Up and Down have a N.O. contact, and the stop has a N.C.

    I can make the up/down work, but not the stop. The customer thinks that UP should be pressed once and the contact on the opener should hold until the limit switch is made. But, right now, UP or DOWN have to be held the whole time. (Release and the motor stops). I believe it is because I don't have the STOP wired in properly.

    On the Diagram:

    UP = C31 - C4
    Down = LS4 - C4

    Any help?

    My son is one of the Few, the Proud, the Infidel.
    Sgt. Mickey, 0311 USMC

  2. #2
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    I'm having a hard time with the drawing. I can't find any way that the LS's would hold in the contacts. Maybe because I stayed too long at the VFW last night! Many of the industrial overhead doors are designed so that someone has to keep the buttons pushed in to avoid accidents. The limit switches are to keep someone from going up or down too far.
    Military wives deserve the Purple Heart Medal. They are wounded every time their Soldier goes off to protect our freedom!

  3. #3
    Join Date
    Jul 2006
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    Same here. Most, if not all, of the roll-up doors I've seen will only move when the button is held. The stop button seems redundant.

  4. #4
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    Cocoa, Florida, USA
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    Wink

    Think I would go directly to the fountainhead . . .
    www.overheaddoor.com

    You may even find the guy who drew up that confusing 1991 drawing.

    Best Wishes
    Steve
    Be Safe Out There

  5. #5
    Join Date
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    East of 480sparky
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    it looks to me as if e1 thru e2 should control the coils for up and down and the c's should be the holding contacts, just a guess. LS's should open the holding contacts..............again, just a guess:-?

  6. #6
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    Oct 2007
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    Maryland
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    overhead door

    all the overhead door we have on site require you to hold the up and down button to keep it moving. We have a couple that are older and will maintain contacts and go out on limits. They have problally been modified though with an extra relay.

  7. #7
    Join Date
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    I did not get a chance to go by there today.

    http://overheaddoor.com was NO HELP at all!

    The limit switches must be connected internally on the board though, as they are part of the circuit. Customer is adamant that the Up be momentary - held by contacts.
    My son is one of the Few, the Proud, the Infidel.
    Sgt. Mickey, 0311 USMC

  8. #8
    Join Date
    Oct 2007
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    British Columbia, Canada
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    It's difficult to figure out without seeing how the rest of the terminal block is wired.

    This is my first time trying to draw ladder logic in ASCII...

    Momentary to open and close:
    Code:
    <--- [/]STOP ---+---+--- []UP ---+--- [/]LS-UP --- (/)DN --- ()UP --->
                    |   +--- ()UP ---+
                    |
                    +---+--- []DN ---+--- [/]LS-DN --- (/)UP --- ()DN --->
                        +--- ()DN ---+
    From this I'd suggest wiring the terminal block as such:
    Connect C2 and C4
    Connect C31 and LS3
    Connect LS2 and E2
    Connect C32 and LS4
    Connect LS1 and E1
    Connect the Stop switch between C and C2/C4
    Connect the Up switch between C2/C4 and C31
    Connect the Down switch between C2/C4 and C32

    I'm working on the assumption that LS2/LS3 is fully open and LS1/LS4 is fully closed,
    and that the guy who designed this used those stubby golf-ball sized crayons.

    Last edited by Rampage_Rick; 11-13-07 at 12:27 AM.
    "The Doppler effect means red lights will appear to be green if you drive fast enough..."
    1) Wait for disaster 2) Determine it's not your fault 3) Blackmail the culprit 4) Profit

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  9. #9
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    Hey, thanks Rick!

    Yes, I would think the designer rode to school on the short bus.
    My son is one of the Few, the Proud, the Infidel.
    Sgt. Mickey, 0311 USMC

  10. #10
    Join Date
    Jul 2007
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    The OHDs I've installed will go up without being held, but not down... that must be held in.

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