Servo Magazine ( February 2009 )
An Introduction to Pneumatic Sytems | Part 2
Now that the basic pneumatic system is operating manually, let's add some electronics to control it. If we add an electromechanical relay and two limit switches, we can make the piston travel back and forth continuously; check out the electrical schematic in Figure 1. The limit switches being used are momentary SPDT miniature switches (Photo 1) and the electromechanical relay is a DPDT 24 VDC coil relay with a socket (see Photo 2). By adding electrical limit switches at the fully retracted ...
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