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Old 09-06-2010, 09:29 PM #1
Powkoa
 
 
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mq2 valve wiring

putting an mq2 in a pump with a utb board/capacitor/microswithc to run it.

Anyone know how I can identify the power vs. the ground wires for the valve??

I know where to solder all of the other wires, except which valve wire gets the positive and which gets the ground.
thanks
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Old 09-07-2010, 05:15 AM #2
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They should be colour coded, no?

Normally black is negative and red is positive. Pretty sure if you get it backwards, the valve won't open. If you get it right it will open.

Best to test it before soldering together. Use some tape to mark which lead is which and then I would suggest a quick disconnect for the actual solenoid leads to the UTB.

That'll save you some hassle in the long run.
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Old 09-07-2010, 12:30 PM #3
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i want to say that it doesn't matter, seeing as a) the wires on my mQ2 are both red, and b) there's a distinct possibility that i switched which one went where when i re-soldered them. i think i remember seeing somewhere that someone had asked and been told that there wasn't a wrong way to do it.

also, like spitle said, you might want to go a different route than soldering if you ever want to get the valve back out of the gun, or at least keep an extra 8" or so of wire between the board and the valve.


pro-tip: if you're going to put together a mockup of your project gun and click the noid, at least pull the sear out first so you don't cut the wires.
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Old 09-07-2010, 03:36 PM #4
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Like the clapper noids, there is no polarity on the MQ.

If you want plugs and such but never wanted to try because of the special tools you would need to do it right (doing them manually is a pain i know) 3M has made a solution for you. You can get them at Mouser among other places i'm sure. Only real problem with them i see is that they only come in 3, 4, 6 or 8 position plugs. But all you need to put the wires in is a pair of normal pliers to squeeze the housing which pierces the wires. Hell they are even color coded (or for the braver people, you can color them all the same to match your gun... you should know which wire does what). Maybe a little overkill with the locking tab and everything, but taking apart a gun is much easier with plugs...
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Last edited by Henkka : 09-07-2010 at 03:41 PM.
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Old 09-07-2010, 09:54 PM #5
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You guys saved my day. I will try to post some before/during/after pics here for anyone interested.

I know it's a minor deal to most of the custom/modifiers in here, but it's a big step outside the box for me.
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