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Great Plains NTA2007HD Operator Manual User Manual

Page 80

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76

Great Plains Manufacturing, Inc.

Contents

Index

NTA607/2007HD

166-283M

Contents

Index

04/04/2011

21. Wipe all the material off the flanges around the

meter doors, on the chute, and capture that material
in the calibration bag.

22. Accurately weigh the calibration bag plus material. If

you set a “tare” on the scale, the reading is the
sample net weight, so skip step 23.

23. Subtract the empty container weight to determine

the application rate for

1

10

hectare (or

1

10

acre).

24. Press the Stop softkey

on the monitor

and enter the sample net weight (SampleWeight).
The monitor responds with a Calibration Constant.

Push the Save softkey

to accept this

value.

25. If the sample was based on

1

10

hectare

(or

1

10

acre), multiply the sample size by 10 to deter-

mine application rate per acre (hectare) at the cur-
rent variable rate gearbox setting.

If the calibrated rate matches the target rate, skip to
step 31. Otherwise…

26. Subtract the calibrated rate per acre (or hectare)

from the target rate to determine a correction differ-
ence.

Null4:

27. Refer to the seed rate chart for Seed Rate gearbox

setting values for the target rate.

Null4:

Manual Seeding Example; Net Weight (step 23):
TotalWeight is 20.96 kg
for bag plus sample
BagWeight is 0.91 kg

SampleWeight is 20.96 - 0.91, which is:

20.96 kg

SampleWeight

TotalWeight

BagWeight

=

If the calibrated rate turns out to match the desired tar-
get rate, record the material details and final Calibration
Constant for future reference.

Manual Seeding Example; Calibrated Rate:
CalibratedRate = 20.96 x 10, which is:

209.6 kg/ha

This is 4.8% higher than our target rate of 200 kg/ha.
However, because the gearbox actuator effect is not lin-
ear, we cannot simply adjust the control arm by 4.8%.

CalibratedRate

SampleWeight

10

×

=

Null4:

USc Example:
TargetRate =

67.6

RateDifference =

67.6 - 75.6,

which is:

-8 pounds

Metric Example:
TargetRate =

200

RateDifference =

200 - 217,

which is:

-17 kg

The calibration run metered too much.
You must lower the gearbox setting to compensate.

RateDifference

T

etR

arg

ate

CalibratedRate

=

TargetRate

Null4:

USc Example:
Initial Variable
Rate Gearbox
Setting: 38

56.9

63.7

35

77538

60.4

67.6

36

77591

63.9

71.7

37

77640

67.6

75.8

38

77683

71.4

80.0

39

77723

75 2

84 3

40

77760

31374

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