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May_Walter 09-04-2010 08:12

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

Leav 09-04-2010 08:21

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

Billfred 09-04-2010 08:23

Re: can we do it?
 
Quote:

Originally Posted by May_Walter (Post 950652)
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

No. Aside from the legal issues (see <R78>), you'll also likely blow the switch with that much current running through.

Racer26 09-04-2010 09:22

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.

Jon Stratis 09-04-2010 10:52

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 :p).

Russ Beavis 09-04-2010 11:18

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

MrForbes 09-04-2010 11:43

Re: can we do it?
 
1 Attachment(s)
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!

RyanN 09-04-2010 12:54

Re: can we do it?
 
Quote:

Originally Posted by squirrel (Post 950770)
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!

Yea, definitely not FRC legal, but it is a creative solution for other projects.

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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