I need to find a DPDT or DPST switch to replace "q029 limit switch".

I have a good client that wants to operate and know the status of her Chamberlain elite swinging gate.

The controller board doesn't have any outputs that I can tie into.
The board does use a nylon lobed wheel that engages one of two q029 limit switches.
When gate is fully open, bottom wheel closes the switch, when gate is fully closed, top wheel closes top switch and opener stops.

Replacement switch can be a little taller, but other dimensions need to be the same.

If you can think of any other solutions, I'm all ears.
Looks like the board uses about 5VDC thru the switch.
I even though about using the existing SPDT switch to energize a DPDT relay and use one leg for original gate controller and the other leg for my usage. I would rather not go that route if I can avoid it.

www.digikey.com

This is a great approach. Building something custom into the existing engineered product is miles above adding on some external something.

First, get as much detail as you can. Take measurements. Call the gate company and see if they have a mfr's spec on the existing switch.

THEN call around. Also try Grainger and McMaster-Carr.

Document it so the next guy to work on it won't be baffled.

Would a wireless contact closure switch from a alarm work?

Tampering with the limit switches (replacing with different ones) would violate the UL 325 gate safety certification - that would be a HUGE no-no!

You didn't say which model Elite swing gate it was. But the limit switch wires must go back to the control board somewhere. Connection into those "with diode isolation" would work. That assumes there are not already terminals built onto the board for this exact thing. Looking thru some of the manuals for Elite swing gates, shows many have alarm contacts for monitoring the state of the gate.

Just as Brad said. We used that approach to trigger lights along a 1000ft driveway when the gate opened and turn them off when closed.

I don't want to go custom if I can avoid it for the reasons stated above.

The opener is made by Chamberlin (now Liftmaster). It is the Elite commercial series.
Board doesn't list specific model beyond OmniControl Commercial.

Some googling revealed that it's Q400E - Omni Main Control Board.
[Link: controlledproducts.com]

And for ultimate score, here is the manual that appears to use the exact board the customer has: [Link: liftmaster.com]

Here are few pics of what the limit switch looks like: [Link: photos.app.goo.gl]
Talking to DigiKey guy, we figured that it's the D2VW-5-1HS
Unfortunately, there doesn't appear to be a DPDT nor DPST equivalent.

As you can see in the pictures, I can move the cam wheels on the vertical shaft if I could find switches that would fit, even if there were thicker (but same mounting holes and length/width).

That is one of my last resort options.
I'm using Control4's new C4-Z2IO module. I have it configured in type 3, which gives me 2 contacts and 1 relay.

Idea is to read gate Open/Close positions for automation/notification and relay for actual control.

Those micro switches are both NC and NO, that is what the unused tab is on the switch. Figure out which one the open tab is ie NC or NO and figure out a way to make that be your trigger.

From your pictures: It appears the limit switches have N.O. & N.C. contacts on them. The gate system is only using the N.O. contacts (Red & Orange wires) of the outputs. You can easily connect to the N.C. contacts and use that for what you want. The Common wires are the Brown & Yellow which can also be found at the J3 connector on the board (Pins 5 & 9).
This would give you precise tracking of when the gate is fully closed or fully open. This however will require 2 inputs on your C4 dry contact board. Or you could just use the close limit switch to let you know when the gate is closed and program the alternate signal as being gate open.
The benefits of using both contacts would be a message saying the gate is active, when in between open & close. Which could show you a stuck gate if it stayed like that for a long time.
The simplest way is to just use 1 contact and if so, you do not even need to touch the limit switches - see below.

Alternately as I mentioned before: There are terminals to do exactly what you want already built into the system. Connector J6 has alarm outputs to connect the C4 system to, that will indicate if the gate is open. This is how you are 'suppose' to tie into the gate system. If the gate system has the optional "Omni Option Board" installed on connector J2, then there is also a set of alarm outputs there to tie into.

Want help? PROVIDE MODEL NUMBERS.


People just won't think to do this. I wrote my signature probably ten years ago after counting actually more than a thousand times when people -- yes, smart people -- asked for help but left out the model number and sometimes even the brand.

If you leave out the model number you make it impossible to get an instant response from the one wacko out here who has figured out all the things that can be done with that model. And that wacko is probably out here! Sure, sooner or later someone will tell you to provide the model number... why is it so hard to imagine that it might be helpful to do that at the start?


If there aren't terminals made for this, you have to be sure not to draw too much current with whatever you piggyback onto the circuit. Don't want a simple add-on to kill the unit!


Too bad the model number isn't known. Someone took the time to look through "some of the manuals" for you but could not actually help you.

Didn't read the entire post again huh Ernie. Mario answered those questions at 8-9am this morning with the links and multi-posts.

'Insert quarter to play again'

Right. I started on it last night and didn't check this morning. Oops.


Fortunately, it's free.

Using the unused terminal on the switch is really smart! Just be sure that the switch is wired with the voltage on the C terminal.

But, wouldn't any unsanctioned connection to the existing electronics void the UL certification?