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AutoTrac Universal 200 Setting up the Steering Wheel Correctly
When first installing the ATU steering unit or transferring it to a different
machine (combine or another tractor), please note the following:
1) Enter the dimensions of the tractor / self‐propelled machine to the nearest
centimeter (the dimensions will be permanently stored and can be accessed at
any time if needed) in:
Main Menu => GreenStar 3 => Equipment => Machine tab => Offsets
2)
Enter the dimensions of the implement / header to the nearest centimeter (the
dimensions
d
e s o s will be pe
permanently
a e y sstored
o ed aand
d ca
can be accessed aat aanyy timee if
needed) in:
Main Menu => GreenStar 3 => Equipment => Implement 1 tab => Offsets
Note: Make sure to include any lateral implement offsets that might not be
visible initially. In many cases, it is worthwhile to take measurements with a tape
measure.
1
3)
Define implement width and track spacing for your machine in:
Main Menu => GreenStar 3 => Equipment => Implement 1 tab =>
Change Widths
Note: Please see the following definitions:
 Implement width: Used for Documentation (with area counter) or Coverage
Map (painted in "blue").
 Track Spacing: Used for automatic steering with AutoTrac Universal 200.
 Physical Width (only required for iTEC Pro, which is not compatible with
ATU. To avoid confusion, uncheck the check mark next to "iTEC Pro" on the
display's Activations page, so the physical width will no longer be displayed).
4)
Enter the correct StarFire receiver height to the nearest centimeter (measure
from the ground to where the yellow receiver shroud begins) in the following 3
locations:
 In Main Menu => GreenStar 3 => Equipment => Machine tab => Change
Offsets (also enter the remaining machine offsets accurately; see item 1
above)
 In Main Menu => GreenStar 3 => Guidance => ATU Steering Wheel icon =>
Page 3/3
 In Main Menu => StarFire Receiver => Settings tab => Enter StarFire Height
in bottom left corner
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AutoTrac Universal 200 Setting up the Steering Wheel Correctly
5)
Enter the distance between the front wheels and the GPS receiver
to the nearest centimeter in:
Main Menu => GreenStar 3 => Guidance => Guidance Settings tab =>
General Settings
(! Not required for combine / forage harvester; setting of 0 does not have to be
changed.)
6)
Park the machine on a level surface (e.g. vehicle scales or equivalent) and
configure the StarFire receiver spirit level (TCM) in:
Main Menu => StarFire Receiver => Settings tab =>
Press "CAL" in lower center area.
7)
For combines / forage harvesters: In the ATU control unit select "Harvester"
instead of "Row Crop Tractor" in the selection menu above as follows:
Main Menu => GreenStar 3 => Guidance => Click on ATU Steering Wheel icon
8)
Adjust the AutoTrac control unit settings for the operation to be performed and
for the working conditions:
Main Menu => GreenStar 3 => Guidance => Click on ATU Steering Wheel icon.
Adjust
d
ATU settings for
f
the
h
vehicle's inertia:
For example, tractors with dual
wheels and/or with an implement
with unilateral pull (= more difficult
to steer), should use lower settings
than tractors with cultivation tires
and/or with a light implement (=
easier to steer).
IMPORTANT:
The main adjustment range for ALL
values is from 80 to 120. All
settings above or below this range
have no significant effect on the
system's response.
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AutoTrac Universal 200 Setting up the Steering Wheel Correctly
re 8) Only change one setting at a time (in increments of 5‐10).
Make sure that all settings match, i.e. they all should be either
inert (low) or sensitive (high).
Example:
Acquisition 180, Tracking 90, Heading 95, Curve Track 90 = INCORRECT
Acquisition 105, Tracking 90, Heading 95, Curve Track 90
= CORRECT
Acquisition 130, Tracking 160, Heading 120, Curve Track 110 = CORRECT
For tractors, start with the following initial values:
 Line Sensitivity, Tracking (ATU Settings Page 1):
 Line Sensitivity, Heading (Page 1):
 Acquisition sensitivity (Page 2):
 Curve Sensitivity (Page 2):
90
90
90
90
9) Optimizing Steering Response in Track (Track Sensing)
 Establish Track 0 (straight track) and drive it once in each direction, observing
the steering/acquisition response, and note the distance between point of
activation to first off‐track error < 10cm (green).
 Increase ‘Acquire Sensitivity’ by an increment of 10 to 100; drive along the
track again and observe the steering/acquisition response.
response The distance
between point of activation to first off‐track error < 10cm (green) should now
be less.
…90…100…110...120…
 Increase ‘Acquire Sensitivity’ by an increment of 10 to 110 etc., until the
result worsens again (nervous steering/oversteering),
/
then reduce acquisition
sensitivity by 10 and check again. The optimum acquisition response should
now be reached (it cannot be improved any further).
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AutoTrac Universal 200 Setting up the Steering Wheel Correctly
10) Optimizing Steering Accuracy in Straight Track
Observe off‐track error while driving in the track. It should always be
less than 5cm (see red circle). If this is not the case, increase the setting for Line
Sensitivity Tracking in increments of 10 and drive the track again.
 The steering response (accuracy) should improve at first, until it worsens again
after another adjustment increment (becomes more nervous,
nervous deviates more
than 10cm); then reduce setting by 20!
(Example: change setting from 90 to 100, 110 and finally to 120 ‐> becomes
noticeably more nervous ‐ change back to 100)
…90…100…110...120…
 Now increase setting for Line Sensitivity ‐ Heading in increments of 10 and
drive along the track again. Observe the steering response (accuracy). If it
worsens after this first input (more nervous, off‐track by more than 10cm),
reduce setting by 10! (Example: change setting from 90 to 100, to 110 ‐> if
worse, change back to 100).
…90…100…110...120…
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AutoTrac Universal 200 Setting up the Steering Wheel Correctly
11)
Optimizing Steering Accuracy for Adaptive Curves or AB Curves
For curve sensitivity, select also an initial setting of 90. Increase this setting
in increments of 10 as well, until the steering response worsens, then reduce
by 10.
…90…100…110...120…
Notes:
 If time permits, increments of 5 can be used for fine tuning, i.e. increase or
decrease the setting in increments of 5, until optimum results are achieved.
 For low speed applications (growing vegetables) of under 5 km/h, the settings for
Line Sensitivity ‐ Tracking and Heading have to be increased considerably (e.g.
T ki 180,
Tracking
180 Heading
H di 140).
140)
 Higher settings for Line Sensitivity ‐ Tracking and Heading are also required at
times for combines/forage harvesters.
 Also check the GPS Accuracy indicator. The more the bar is filled in, the higher
the accuracy from one track to the next.
 These Setup guidelines are no substitute for reading the operator's manual.
precautions in the operator's
p
manual.
Please follow the safetyy p
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| AutoTrac Universal 200 ‐ Setting up the Steering Wheel Correctly
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