Great Plains ADC2220 Operator Manual - Manual (Page 36)

32 ADC2220 Table of Contents Index Great Plains Manufacturing, Inc.
167-073M Table of Contents Index 2012-10-17
Acremeter Operation
The acremeter, located on the air cart clutch shaft,
counts shaft rotations whenever the shaft is rotating - this
is with the drill lowered and in motion or during
calibration crank operation. The meter is programmed to
display rotations as acres or hectares
a
, when using all
rows, factory-specified tires and tire inflations.
Note: Unusual conditions and/or non-standard row
spacings can cause the acremeter tally to vary
from actual acres planted.
Normal Operating Sequence
Note: The acremeter counts rotations during air cart
calibration (and if so, can be useful for calibration).
1. Record the acremeter reading at the start of planting
(and after calibration). The large “12345.6” format
display is the grand total area since meter
installation. The smaller number in the lower left
corner is the number of revolutions per acre for
which the meter was factory-programmed. If the
display is blank, see “Dormant Display” below.
2. Lower air cart and plant. Acremeter counts shaft
rotations, calculates acres or hectares, and adds to
the running grand total.
3. During planting (air cart lowered and moving
forward), the display blanks (goes dormant), but area
tally continues.
4. When raised for turns, obstructions and transport,
the clutch disengages, the shaft stops, and the meter
counts no additional (non-planting) rotations.
5. Whenever shaft rotation stops, the LCD display
activates after 30 to 60 seconds, and remains visible
for 30 to 45 minutes.
6. At the completion of planting, record the final reading
or the grand total. If the display goes dormant before
you can read it, see “Dormant Display”.
7. Subtract the reading at Step 1 from the reading at
Step 6 for the total planted in the present session.
Dormant Display
Refer to Figure 28
To conserve power, the LCD display blanks itself most of
the time. If you need to read the display after it has
“timed out” and gone dormant:
• use the calibration crank to turn the jackshaft once, or
• gently tap or wave a magnet at either of the Great
Plains logo spots on the lower region of the display.
Be careful not to scratch the window.
a. See page 106 for replacement and alternate meters.
Figure 27
Electronic Acremeter
27378
Figure 28
Meter Display (Acres)
29016
1
1