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#1
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can we do it?
Hi guys
is it legal to attach the compressor's electricity cable to the pressure switch instead of using the code? Thanks Team Artemis #3083 |
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#2
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Re: can we do it?
Hi May,
The pressure switch is not built to withstand the currents needed to power the compressor, and at least from that perspective it is not possible to connect it that way. It may also be illegal. if you need help programming it in let us know... -Leav |
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#3
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Re: can we do it?
No. Aside from the legal issues (see <R78>), you'll also likely blow the switch with that much current running through.
Last edited by Billfred : 09-04-2010 at 08:25. |
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#4
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Re: can we do it?
It is against the rules, however, I'm not sure I agree with the notion that its likely to break the switch. We've used a setup such as this in a system without an RC or cRIO and achieved expected behavior, though its worth noting that we may well have been operating outside of the switch's specifications, and shortening its life.
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#5
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Re: can we do it?
As others have said, it's against the rules and will likely blow out the switch. Check out page 5 here (it is the catalog page for the switch provided in the KoP):
http://www.nasonptc.com/pdf/catalog_switch.pdf The switch is rated at 5A, 30V DC. Go above that, and you will burn it out sooner or later (given how these things go... mostly like on the field, in the finals ). |
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#6
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Re: can we do it?
Don't forget that the compressor is an inductive load. Simply turning it on and off with a contact switch will result in arcing at the switch which will eventually destroy the switch (and create lots of EMI in the process) unless a suitable snubbing circuit is employed to dissipate the energy in the motor inductance.
The switch probably can't handle the currents anyways as described by eagle33199. And it's illegal as described by Billfred. Sometimes it is very nice to have a hardware solution to a simple problem, though, isn't it... Russ |
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#7
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Re: can we do it?
I probably should not post this, but.....
The pressure switch for a well pump, available at the local hardware store. It's the same switch that is used on shop air compressors to cycle them. Definitely NOT FRC legal! |
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#8
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Re: can we do it?
Quote:
I did something similar on our old cart. I used the old pressure switch and connected it to a simple automotive relay rated at 30A to run the compressor. It worked well, but I like your solution much better. It looks so cool. |
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