General Question About Pneumatics

[dlavery]

Originally Posted by mta

Actually, you can just put the sensor inline with the power cables for the compressor. lilke This:

-------------------
= -sensor
|
x -compressor
+++++++++++++++


because if the sensor reaches over 115 psi it will return a zero, efectivly stopping the power to the compressor. This is what our team did on a practice build. it worked great.

There is actually no need to connect the sensor to the controler board at all. It works just a like a switch.

You should absolutely NOT do this!!! The compressor can have a start-up surge of 25 amps or more. The pressure sensor is not rated for this current, and it is almost certain that you will burn it up sooner rather than later.

To back this up, and basically to save you from yourself, Rule <R91> makes it clear that the Pressure Switch must be connected to the Robot Controller. Furthermore, Rule <R96> again makes it clear that the pressure switch muse be connected to the Robot Controller, and not anywhere else. The RC must then activate a relay to power the compressor. Connecting the pressure switch anywhere else is a violation, and will get you nailed during inspection.

-dave



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