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power draw allowed on solenoid breakout
So the manual says that if I have a 4 port crio the maximum power I can draw from the solenoid breakout is 21w. Does it matter if that is all from one set of pins or is there a limit to how much I can draw from a pair of pins?
We are running 4 valves that draw 3w each and want to wire them all to the same set of pins to be controlled all at once. 12W at 24V is .5A Can a set of pins handle 500mA? |
Re: power draw allowed on solenoid breakout
Never mind. I found my answer here
http://www.usfirst.org/sites/default...20Breakout.pdf A set of pins has a max current of .75A. Thanks |
Re: power draw allowed on solenoid breakout
By rule (R51) you can only hook up one solenoid per output. So in this case can & may means two different things.
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Re: power draw allowed on solenoid breakout
As Frank pointed out there is a legal issue here.
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In any case, there's not much advantage in ganging multiple solenoids to one channel. Enabling multiple channels on the breakout board at the same time is trivial to do in programming and gives you far more flexibility. If you're out of outputs on the breakout you're also probably pushing the wattage limit defined in <R69>; not great for legal and technical reasons. If you really want to run multiple solenoids off a single 'output', you can gang multiple pneumatic relays off a single Spike relay. This requires the use of 12v solenoids, obviously, but it is explicitly allowed for in the rules. |
Re: power draw allowed on solenoid breakout
Hoping Big Al chimes in here but the issue is running out of ports. THe cumulative draw is no where near the 21W limit however.
We could add another 24V solenoid breakout but we really didn't want to. If we use a spike and four 24V solenoids we could put connect them in 2S2P and this would also work I think. |
Re: power draw allowed on solenoid breakout
We can only have a single 24v solenoid breakout per the R42 rule.
We can have more 12v solenoid breakouts. The Spikes can be used for 12v solenoids, but not for 24v. They aren't rated for that. |
Re: power draw allowed on solenoid breakout
Dang
Thanks |
Re: power draw allowed on solenoid breakout
ya the spikes are out I was thinking backwards on the voltages.
Thanks again |
Re: power draw allowed on solenoid breakout
The rules actually say you can only power one solenoid breakout from the PD 24 supply. The question becomes can you use a custom circuit to power the second solenoid breakout at 24 V. Al was checking on that from another thread.
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Re: power draw allowed on solenoid breakout
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