Near Intersection of I-35 & I-90 Southern Mn. | Yes, my documentation says Driver 13 also but I have information indicating that this is a Master.
On Friday, I was making cables to go from a Deere Rate Controller on an NH3 bar to a Raven Accu-flow system with two sections. We firmly believe that using a Standard Control Valve, Master ON/OFF and two Section ON/OFF valves is the proper way to go with a two section rig. This approach has been argued here before but we stick with our plan.
This cable goes from the Deere RC to the various components. I believe I could have used Pin 18 as the Trigger for the Master Valve, Pin 4 for the Left Section Valve and Pin 5 for the Right Section Valve. I chose to use a diode bridge which makes a logic "OR" gate with the Left and Right sections as Input and the output goes to the Master Trigger. The flowmeter goes to Pins 21, 25 & 28. The control circuit uses Pins 15 & 16. This is all consistent with your chart.
Apparently the Deere doesn't have a minimum pressure setting? I haven't worked with the RC personally but my Brown Box in my 4720 has a minimum pressure setting to handle a situation such as you have described. I''m surprised that they don't have a setting for such a situation. Possibly there is such as setting but this would require an electronic pressure transducer which may be more trouble than its worth.
The suggestion of creating a minimum flow mechanically should work as long as the system has a way to stop the pump via another valve controlled by a separate switch. This must be the case as you are running in Fast rather than Fast Close.
Mechanically setting a low limit without the ability to stop the pump via another method could cause problems in certain situations. For example, suppose you ran the tank dry (never a good idea but happens), you need a way to stop the pump.
Edited by tedbear 6/14/2010 07:07
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JD Rate Controller in Rogator 854 answers
