Near Intersection of I-35 & I-90 Southern Mn. | The above are correct.
What is possibly confusing you is the fact that there are four wires and it appears that three should suffice. The reason the drawing shows the black and green being tied together to ground is that this will work with a simple switch as shown. This fourth wire could be used in other situations so that connecting/disconnecting it to ground would cause action. This would rarely be used.
Inside the motor area there is a Double Pole Double Throw relay, that applies power to the motor. The polarity going to the motor changes based on the position of the relay. Limit switches are also used to stop the action.
Since the motor needs power/ground to run the motor, it needs both to move. The white wire is the trigger to control the relay so it turns the motor one direction or the other. With the white wire "hot" the relay moves so power turns the motor to open the valve but is stopped by the limit switch. With no power to the white wire, the relay relaxes and sends the opposite polarity to the motor so it turns the other direction until it reaches that limit switch.
I wouldn't be overly concerned about key switched power since the motor will not be drawing power when it reaches either limit switch. I'm not saying that key switched power is a bad idea but you must find a source that can handle the load of all valves cycling at the same time as if often the case with a sprayer.
In an Ag Leader system, the power to run the ball valves and the modules are always "hot".
Edited by tedbear 3/25/2017 09:10
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Banjo ball valve wiring?
