Thanks-- Glad it helped! I suspected the MacDon type heads would be performing the same way as the cornheads, etc...same basic symptom of "slam to ground on Activation".

Here are a few paragraphs copied from the Headsight Lexion manual:

Symptom: When the CAC system is engaged, the header dives into the ground, then recovers to the preset height.

Cause:
For machines with 2011-2014 OEM Lexion software, play in the connection between the header and feeder house can cause the calibration process to not work correctly. If your feeder can drop more than ½” after the header solid frame (not flex cutterbar skids) touches the ground, it is recommended that you use one of the two following solutions.

(Note: the float springs on a MacDon head , or stubble stompers on a corn head, can cause the same results)

Solution 1:
6/700 series combines with SN’s starting with C67, C68, or C69 and later should have the software updated to at least VBM 3.6.3 to eliminate this issue. Earlier machines, see solution 2.


Solution 2:
1. Remove or chain up any stubble stompers so they do not carry header weight during calibration.

2. Use blocks under the feeder faceplate to stop further movement downward during the calibration process. The block height should be enough to stop the feeder just as the solid frame of the head contacts the ground (not flex cutterbar skids). This procedure works for all 6/700 combines.


Note: for the MAcDon, Seedcleaner's approach of stopping the feeder just as the float optimizer "bottoms out" the sensor(s) would be correct.

For those with inquiring minds...it has to do with the way Lexion early 700 software calibrates the Lift Pressure during the calibration. And the fact that the head drops looking for that calibrated pressure upon activation.


Your picture didn't come thru, But I assume it was the "Sensitivity CAC" page: The following three are pretty much your only settings.
"Cutting Height Adjustment" is actually height sensitivity.
"Lateral leveling" is tilt sensitivity.
"Automatic Drop Rate" controls drop in Auto, separate from "Fast Manual Lowering"

I will note that selecting a certain header type in Cebis can also affect AHC...for instance header width seems to affect lateral settings, and "Aftermarket Corn head" seems to be different from a standard Lexion head. I don't know details.

 

I'll try the picture again. I don't understand why it doesn't come up. I back them up online and "share" them before copying the image address for the forum. It even shows up when I go to an incognito mode on Chrome and view the thread signed out.

https://lh3.googleusercontent.com/n...fiOkiZaNawddlWJlHcVuURs_V4OMFXtz_MYbLp90kROYJ3fRG0trRdimM_bV2efQQ=w1440-h810-no

I am almost surprised that header width would affect lateral tilt.

So which header should I select for MacDon? I think I currently have it on "header from another make"

 

While on the topic, I have a question about AHHC.

Which of these settings alter vertical AUTOMATIC height control? I know the top one does.

Thanks

Pic?

 

Lol, Don, I see the picture clearly in your quoted reply. I give up. I'll do it the old fashioned way!