Seedcleaner. We actually have done a fancy version of this using our Horizon controller; its called Draper Hybrid mode. It uses a combination of off ground sensors and the flex lateral sensors in combination to allow control over both off-ground and flex mode seamlessly--however we currently only offer it with the Horizon/Terrahawk system and its probably the single most complex and advanced system we offer!
The Lexion already does this for you "sort of". The lift pressure is always part of the height equation (0-50). If your float pins were locked, the change in lift pressure as the head hits the ground should cause the combine to raise the head. However, I agree the MacDon float optimizer should be more "responsive" in motion.
Your suggestion may work, as long as you set things right. Obviously your float optimizer is not locked for this sensor to even move. However, there is a "problem" with the logic.
Theory: Consider every sensor on the head (including the float) to have a 4.0V up, 1V smashed range. Our "normal" software, the lowest voltage sensor "wins" and is passed on to the combine. So, on level ground, with the head frame just touching the ground...every "drag rod" sensor should already be smashed at 1V, while the float sensor would still be 4.0. So the float sensor literally would not affect the outputs to the combine at all even if it reached 1.0V too, since the others are already fully "smashed".
Now I realize that high centered on a terrace is not sitting on flat ground...so this approach MAY still work...you can certainly try. I would recommend blocking the feeder travel as normal during calibration so we get the maximum sensitivity out of the float optimizer setting.
I believe there is a better way--using our Feathersight (FT) software. Feathersight is a software tool that basically does in our Insight or Horizon controller what the Lexion does internally--sums the lift pressure sensor with the height sensors to create a full range. By running your float optimizer sensor into the Feathersight input, you could do exactly what you want...height sensors control off the ground, but immediate change when the float optimizer starts changing. Our software also includes settings to adjust balance (FT to drag rod) which lets you adjust how sensitive that is.
Unfortunately, your current adapter harness does not have the FT input wired in. However, by moving one wire in the Insight plug, we could make your "Center" input into a FT input, which I believe would make this work. It may not have the correct power source (5V instead of 12V) for your MacDon/Lexion header sensor though. Contact me if you wish, and we can figure that out.
There are some downsides:
1)Any bounce in your float optimizer will make the AHHC respond. If your springs are set too light, you could end up with a "feedback" loop with the head bouncing uncontrollably.
2)Depending on settings, AHHC may be slightly less sensitive off the ground. FT transfers some control from the drag rods to the "pressure". You may need to turn up AHHC sensitivity in Cebis.
So again, proper settings and adjustments are going to be critical!
Last edited by Jeff-C-IL; 06-18-2019 at 11:54 AM.