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Originally Posted by KenWittlief
the solonoids are not polarity sensitive - if current flows through the two wires they will trip
and I would be really surprized if the compressor cares which way it runs - the motor makes the piston go up and down - I dont think it cares if it goes down and up instead.
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I believe the single solenoid was connected to an external ground not on the spike (as we generally do for all our double or single solenoids, but I did not wire it personally). I will have to take a good look at the program, wires, and pneumatics to figure it out.
Quote from the 2004 Pneumatics Manual:
"Ensure that the relay is programmed to provide “forward” power only to the
compressor. Do not reverse the compressor!"