Great Plains NTA2007 Operator Manual User Manual
Page 86
82
NTA607 or NTA2007
Great Plains Manufacturing, Inc.
166-372M
2012-01-05
28. Determine the amount of rate change for each
degree of control arm rotation from the target setting.
If the calibrated rate was
higher than target (as in our example),
examine lower gearbox setting values.
If the calibrated rate was
lower than target,
examine higher gearbox setting values.
29. Adjust the control arm by the number of degrees
needed to adjust for the calibration difference.
The rate of the arm adjusting crank is more than one
scale degree per turn, and the crank can only be
pinned at quarter turns. Pin it when the indicator is
closest to the corrected setting.
30. To validate the adjustment, run the calibration again,
starting at step 14 on page 80, using the new
Variable Rate Gearbox scale setting.
This validates the gearbox adjustment, and will
generate a new, more precise Calibration Constant.
31. With the present meter satisfactorily calibrated, re-
mount the final drive gear removed (if any) from the
meter on the other hopper.
32. Repeat the calibration procedure for the other
hopper, starting at step 1 on page 78.
33. Continue at “Calibration Close-Out” on page 84.
TargetRate
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
Metric Example:
USc Example:
1 degree lower reduces rate by
201.3 - 195.4, or 5.9 kg
67.6-63.9, or 3.7 lbs
2 degrees lower reduces by
201.3 - 189.4, or 11.9 kg
67.6-60.4, or 7.2 lbs
3 degrees lower reduces by
201.3 - 183.5, or 17.8 kg
67.6-56.9, or 10.7 lbs
Metric Example:
USc Example:
The calibration difference was:
17 kg
8 pounds.
Adjusting down 3 degrees
would slightly over-correct,
at a difference of 17.8 kg
Adjusting down 2 degrees
would correct by 7.2
pounds, but adjusting by 3
would over-correct to 10.7
lbs.
So adjust the gearbox
setting to just under 3
degrees lower, to a final
scale setting of:
So adjust the gearbox
setting to just over 2
degrees lower, to a final
scale setting:
slightly above 59
slightly below 36