remember to swap the 20 amp fuse for a 20 amp breaker, otherwise, you'll find yourselves running through fuses like popcorn...
that's what happens then FIRST requires you to run a 40amp compressor through a 20amp fuse...
it's not a problem during competition matches, but if you ever have the compressor running more than once in a period of five to ten minutes, it'll pop the fuse... however, oddly enough, the breakers don't seem to have the same problem...
remember, the pressure switch is on-off, and does NOT tell you the pressure in PSI...
the way we (mechanical pandas) explained it to the control team is that, if poer can flow through the pressure switch, turn on the compressor, if power can't flow, turn it off...
i know, you're probably asking "why dont we just run the compressor directly through the pressure switch" well, it's because FIRST says so...
Quote:
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Originally Posted by FIRST Pneumatics Manual Rev B Page 3
Do NOT put the pressure switch in series with the power supply to
the compressor.
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I added the emphasis...
Quote:
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Originally Posted by FIRST Competition Manual, The Robot Rev H, Page 29, <R77>
The Nason pressure switch must be connected to the high-pressure side of the pneumatic circuit (i.e. prior to the pressure regulator) to sense the “stored” pressure of the circuit. The two wires from the pressure switch must be connected directly to a digital input and ground port on the Digital Sidecar, and the cRIO Mobile Device Controller must be programmed to sense the state of the switch and operate the relay module that powers the compressor to prevent over-pressuring the system.
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-Z
It's a game feature, they're helping us, please don't complain too loudly.... - MrForbes [more] 
11-02-2009, 03:51
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