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Grain Moisture and Weight Calibration (cont.)
Do not attempt to make the first load harvested a calibration load.
•
Frequent stops and starts (as harvest begins) to adjust
the machine will result in inaccurate calibration. Once
calibration is performed, calibration values can be applied
to the initial loads harvested prior to calibration.
•
Do not harvest calibration loads until headlands are harvested
•
Prior to harvesting the calibration load, make sure the grain
tank and truck, cart or trailer used to transport the calibration
load is completely empty. Attempt to harvest calibration
loads of nearly the same size for best accuracy. Loads of at
least 10,000 lbs. are suggested.
•
Be sure to select a new load prior to harvesting any of the
crop to be used for calibration
•
Empty the load into the truck or trailer. Immediately select
a new load after unloading. Failure to change loads will
add to the original calibration load and lead to high
calibration errors.
•
Do not unload on-the-go when harvesting calibration loads
More than one calibration load is suggested, using a range of
speeds and throughputs that are expected in normal operation.
Harvest at least 4 calibration loads for each crop (6-8
is recommended).
•
The objective is to "teach" the flow sensor what different
flow rates "feel" to the sensor
•
The high output rate should be near that which the operator
would prefer to operate the machine
•
Medium and low rates are also suggested since variations in
yield throughout the field, or conditions that result in reduced
ground speed, can periodically lower throughput during
normal harvest
•
A medium flow rate is 30% less than the high flow rate.
A low flow rate is 30% less than the medium flow rate.
Example: If the maximum observed flow – instant dry bu.
is 2,000 bu./hr. on the display this is considered the high
flow rate. The medium flow rate would be 1400 bu./hr. and
the low flow rate would be 800 bu./hr. Reduced flow rates
are achieved by driving slower or taking a reduced swath.
•
The operator should attempt to maintain a consistent flow
rate when harvesting each of the loads. Use the
"Instantaneous Flow-Dry" display to monitor throughput.
•
Take 4-5 moisture tests in each load. Use the average value
as the "Actual" moisture reading.
An understanding of these basics is essential in achieving
accurate AFS data records. The AFS Universal Display Plus
Operator's Manual for Harvesting Operations provides step-by-
step and detailed instructions for performing AFS operations,
calibrations, and managing the display information and harvest
data (see table 31.1).
•
Follow instructions to "Apply Cal Values" as necessary to
loads harvested prior to calibration
BASIC START-UP REQUIREMENTS
STEPS FOR A SUCCESSFUL HARVEST
The following are the basic steps required to start harvesting:
N
OTE: Ensure ATA Flash Data Card is installed prior to
powering the system and performing any set up functions.
Check time, date, and units of measure. (MAIN Screen>
SETUP Screen>Display Screen)
Select correct machine model, 44/66 or 77/88. (MAIN
Screen>SETUP Screen>COMBINE Screen>Vehicle
Setup
)
Enter grain flow sensor calibration number. (MAIN
Screen>SETUP Screen>COMBINE Screen>Vehicle
Setup
)
Set up farms, fields, and loads. (MAIN Screen>HARV
Screen>{as determined by user defined screens})
Check that proper crop type is assigned before
harvesting a given farm field, load. (MAIN Screen>HARV
Screen>{as determined by user defined screens})
Check % Crop Trade Moisture and Crop Trade Weight
("USA" units) to be used as the dry basis for the crop
being harvested. (MAIN Screen>SETUP Screen>
COMBINE Screen>Crop Setup
Associate header type and size with each crop type.
(MAIN Screen>SETUP Screen>COMBINE Screen>Crop
Setup
)
Set Header Stop Height for each crop type. (MAIN
Screen>SETUP Screen>COMBINE Screen>Crop Setup
Set Header Alarm Beep to 1, 2, 3, 4, or 5 Beep. (MAIN
Screen>SETUP Screen>COMBINE Screen> Vehicle
Setup
)
Set GPS configuration and logging interval (if equipped).
(MAIN Screen>SETUP Screen>COMBINE Screen>
Vehicle Setup
)
Perform Distance Calibration (MAIN Screen> CAL Screen>
DISTANCE Screen)
Harvest a sample of the grain.
Calibrate moisture sensor. (MAIN Screen>CAL Screen>
LOAD Screen>MOISTURE
Harvest calibration loads at different throughput
levels and then perform full calibration. (MAIN Screen>
CAL Screen>AREA and LOAD Screens)
Calibrate yield sensor. (MAIN Screen>CAL Screen>LOAD
Screen>YIELD
)
Repeat calibration process for each crop type.
AFS
)
)
)
Table 31.1
31
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