NTA907HD and NTA3007HD
Adjustments
Great Plains
| 166-207M | 02/26/2019
79
11. Turn the calibration crank for the number of turns to
simulate
1
10
hectare (or
1
10
acre).
It is important to turn the calibration crank rapidly. Use
a comfortable speed not exceeding 2 revolutions per
second, which would simulate 10 kph (6.2 mph)
planting speed. A longer calibration is always more
accurate, especially for low rates and small seeds.
1
10
hectare is easy to calculate and is a minimum
calibration run.
See table at right for revolutions per area.
12. Wipe all the material off the flanges around the meter
doors and capture that material in the calibration
container.
13. Accurately weigh the container plus material.
14. Subtract the empty container weight to determine the
application rate for
1
10
acre (or
1
10
hectare).
15. 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.
16. Multiply the sample size by 10 to determine
application rate per acre (hectare) at the current
variable rate gearbox setting.
If the calibrated rate matches the target rate, skip to
step 22. Otherwise…
17. Subtract the calibrated rate per acre (or hectare)
from the target rate to determine a rate correction
difference.
18. Determine a new chart rate, based on the previous
chart (not target) rate. To lower for the next rate:
To raise for the next rate:
Calibration Crank Revolutions
NTA907HD
Revs/hectare
1050
Per 1/10th ha
105
NTA3007HD
Revs/acre
425
Per 1/10th ac
42.5
Example:
MeasuredWeight
is 23.3 kg
for container plus sample
ContainerWeight
is 1.52 kg
SampleWeight
= 23.3 - 1.5, which is:
21.7 kg
SampleWeight
MeasuredWeight ContainerWeight
–
=
Example:
CalibratedRate
= 21.7 x 10, which is:
217 kg/ha
This is 8% higher than our target rate of 200 kg/ha. However,
because the gearbox actuator effect is not linear, we cannot
simply adjust it 8%.
CalibratedRate
SampleWeight
10
=
Example:
TargetRate
= 200
RateDifference =
217 - 200,
which is: 17 kg
The calibration run metered 17 kg too much.
You must
lower
the gearbox setting to compensate.
RateDifference
T
etR
arg
ate CalibratedRate
–
=
Example: Need to lower
RateDifference =
17 kg
OldChart
= 201.3
NewChart
= 201.3 - 17, which is:
183.9
nearest chart value is: 183.5
NewChart
OldChart RateDifference
–
=
NewChart
OldChart RateDifference
+
=
Содержание NTA3007HD
Страница 2: ...Great Plains 166 207M 02 26 2019 Table of Contents Index ii 166 207M Table of Contents Index ...
Страница 4: ...2SF24 and 2SF30 ...
Страница 177: ...Table of Contents Index Table of Contents Index ...
Страница 178: ...Great Plains Mfg 1525 E North St P O Box 5060 Salina KS 67402 Table of Contents Index ...