Great Plains NTA2007HD Operator Manual - Manual (Page 70)

66 Great Plains Manufacturing, Inc. Contents Index NTA607/2007HD
166-283M Contents Index 04/04/2011
Find Your Chart and Rate
Standard “2 star” rates are in the main section of the
Seed Rate manual. “3 star” and “4 star” rates are in the
Appendix.
If you are planning to operate both hoppers, perform the
setup steps separately for each hopper, as the configura-
tions (including stars) may be completely different.
1. Confirm that the chart is for the material and star
configuration you have.
2. Find your target population or application rate.
Note: If you have a choice of charts, for most consistent
results, pick one that results in a variable rate gear-
box value between 30 and 70.
Dual Hopper Considerations
If you are applying the same material from both hoppers,
what chart rate to start with depends on whether you will
run both meters simultaneously, or sequentially (run one,
then the other).
The charts do not account for “twin” hopper operation. If
both hoppers are metering the same material, at the
same rate, and at the same time, the output is twice the
chart rate. If run sequentially, or metering different mate-
rials at the same time, treat them as single-hopper oper-
ation.
High Rate Flute Considerations
“High Rate” charts are provided for some seeds, but the
charts do not cover all possible combinations of high-rate
flutes. You can use any standard-rate single-hopper
chart.
Adjustment for Dual Metering / High Rate Flutes
To find the initial chart rate for dual hopper and/or alter-
nate flutes:
anchor
To find the rate to check at calibration:
Null4:
Target Rate Adjustments
Hoppers for This Material
Single or
Sequential
Dual
Simultaneous
2 Stars
(std.)
Chart would be 1x rate
LookupFactor = 1.0
TwinFactor = 1.0
Chart would be 2x rate
LookupFactor = 0.5
TwinFactor = 0.5
3 Stars
Chart would be 1.5x
rate
LookupFactor = 0.67
TwinFactor = 1.0
Chart would be 3x rate
LookupFactor = 0.33
TwinFactor = 0.5
4 Stars
Chart would be 2x rate
LookupFactor = 0.5
TwinFactor = 1.0
Chart would be 4x rate
LookupFactor = 0.25
TwinFactor = 0.5
Null4:
For Example:
Drill: NTA607HD-3275
Crop: Barley (no high rate flute chart available)
Field rate: 500 kg/ha (above 2 flute chart coverage)
Flutes: 3 star
Metering: simultaneous dual hopper
165 = 500 x 0.33
Lookup the settings for 165 kg/ha
ChartRate FieldRate LookupFactor
×
=
Null4:
Continuing the example:
Field rate: 500 kg/ha
250 = 500 x 0.5
Calibrate each meter to 250 kg/ha
CalRate FieldRate TwinFactor
Ч
=