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Field IQ Trimble for 28 % Applicator
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Fingers77
Posted 2/1/2025 19:51 (#11084337 - in reply to #11083367)
Subject: RE: Field IQ Trimble for 28 % Applicator



I believe you have several options. A lot of my knowledge is from the early days of FIQ and we haven't changed setups much over the years so I am not sure of the new functionalities they added over the years.

I don't think FIQ really cares too terribly much what it controls as long as it has something to control and a feedback so it can decide how to get the proper flow rate.

You can use the hypro pump (PWM controlled) with a flow meter I do believe.

Our DB90 for NH3 ran a PWM controlled vane pump and a flow meter so as a similar setup it should work for liquid. We also have section valves to kill flow on the end rows and while stopped for faster on/off control on the end rows.

HOWEVER in our setup with the pump (positive displacement as a John Blue) allows flow of the 50 psi NH3 through the pump even if rate is supposed to be zero and the section valves are open. I am in the process of changing the setup now. I am adding a servo valve to throttle flow, a hydraulic dump valve on the pump hoses to turn the pump off on the end rows, and still utilize the flow meter. I'll set the pump pressure to a "pressure" by hydraulic flow from in the cab and let the servo valve control actual flow. It will give me much better control over flow at low speeds.

You may need a dump valve to allow the flow back to the tank on the ends so the pump can stay running at or (close to) your running pressure and speed to keep a lag from happening as you get back started on the next pass. It will take several seconds to change pump pressure.

For instance our sprayer has a PWM controlled pump, section valves, a flow meter, and I do believe a dump valve. I know our older one did, but with this newer one, I have never really researched what happens to the pump when turning on the ends, we just left it stock and it doesn't spike pressure while turning. I am guessing there is a dump valve.

Another way to run the system would to have a static pump pressure with a bypass and then a control flow servo valve and flow meter that meters the flow along the output line from the pump similar to what I described above I am changing the DB 90 to.

Our dry box has a hydraulic servo valve and shaft encoder that measures belt RPM and adjusts the speed of the belt as needed to keep rate.

The John Blue pump we run on a planter is controlled with a (now obsolete) Rawson drive that measures RPM and controls the rotation speed all in it's own module, it doesn't utilize a RSCM, rather a Rawson module since Rawson's are their own thing.

The hydraulic drives on the planter we used to also have Rawson's control rate but as they died, I changed them back to Deere hydraulic drives I got cheap from NAT classifieds. Deere drives utilize a hydraulic motor controlled with a PWM valve and a shaft encoder that tells FIQ the speed of shaft rotation. Input a gear ratio and it calculates population.

I would think one of these would also work fine for driving a John Blue pump. That's my plan when my last Rawson drive dies and I'll need to drive it with something else, I plan on keeping the John Blue.

I am not sure that you can use a flow meter to control the rate of a hydraulic drive on a John blue I believe monitoring the shaft rotation vs a flow meter would give you better results. Once calibrated John Blue pumps just work. They're positive displacement so you really don't NEED a flow meter, a shaft rotation monitor of the pump is adequate. You can easily calibrate a pump stroke based on a RPM you want from the hydraulic drive, then fine tune all rates with the hydraulic drive controlled by FIQ.

Did this confusing wordy explanation help any?

I fear have the same problem I fear TedBear has, we can get (a little) wordy with our replies (not an insult Ted, a compliment!), but especially in his case he's a wealth of knowledge and wants to convey possibilities and pitfalls of what he's seen.

As you can tell, I have been around the Trimble stuff a while and a lot of what we have is not the "norm". To my knowledge we have the only Trimble controlled dry box within about 100 miles of here based on conversations I have had with several dealers over the years. Our older Hagie was one of the first controlled with what at the time was FIQ's precursor, TAC.

I hope this helps more than it confuses.

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