Great Plains 3N-4020 Operator Manual - Manual (Page 51)

Great Plains Manufacturing, Inc. Table of Contents Index Hydraulic Drive Operation 47
2013-10-29 Table of Contents Index 196-359M
Full Calibration
Make sure the seed meter cups are full, and seed can
flow at initial motor rotation. To prime the cups, see
page 44.
Refer to Figure 56
31. Turn the console on with the ON/VR button. Check,
and as necessary, repeat step 1 through step 18.
32. Enter the amount of seed you want to measure. This
should be at least 1 ⁄
4
of a pound (0.1 kg). Press
FUNCTION button to advance to next window.
The amount shown at right is from the example esti-
mate at step 2.
Refer to Figure 57
33. Normally, the console display informs you of the
length of time, in seconds, that the drive will be oper-
ating, in order to meter the amount of seed you have
requested, at the calibration number, drill width, and
number of rows you have selected. Press FUNC-
TION button to advance to next window.
Refer to Figure 58
34. If the screen reads instead:
TIME TOO LOW, or
TIME TOO HIGH,
change the amount of seed that you will count or
measure. For calibration accuracy, the Controller
firmware does not allow calibrating at settings that
would result in the drive rotating for less than 4 sec-
onds, or more than 255 seconds.
Press FUNCTION button to return to step 31.
Note: If modest adjustments to the sample size continue
to result in HIGH/LOW errors, chances are some
other parameter is zero or incorrect by a large fac-
tor (such as decimal place error). To start over,
press OFF, and then ON.
Figure 56
Cal. Mode Seed Target
28255
Figure 57
Cal. Mode Time Window
28256
Figure 58
Cal. Mode Time Limit Error
28257