Operating instructions

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 19
2013-03-25 Table of Contents Index 403-362M
Fan General Operating Information
Adjust the fan rpm and butterfly valves to provide
sufficient air flow for consistent transport of seed and dry
fertilizer. Suggested values are shown at right.
Fan rpm is controlled by the tractor circuit, and reported
by the seed monitor. Always start the fan with a low flow
setting. Gradually bring fan up to the target rpm.
Fan air pressure is measured by a sensor in the fertilizer
hopper, and reported by the seed monitor. Air pressure is
controlled by fan rpm, butterfly valve settings, material
density and rates. System settings may vary with
material mix, material density and rates.
Recommend initial butterfly valve setting is 0° (wide
open) at both valves (assuming material application from
both hoppers). If one hopper is unused, set the valve for
that hopper to 30° to simulate the normal back-pressure
of material flow from that hopper.
Butterfly Valves
Use tractor remote hydraulic valve flow control to set fan
speed and butterfly valves to balance flow. Precise
technique depends on tractor capabilities:
• For any setup adjustment, operate the tractor engine
at typical field rpms, and not at idle.
• Preset the butterfly valves. Use any settings that you
previously developed for the material mix and rates,
otherwise:
If the tractor has fine control of remote flow rates, and
consistent flow at varying tractor engine rpm, initially
set the butterfly valves to 0°.
If the tractor has only coarse control of flow, initially set
the butterfly valves to 45°.
• Set the fan circuit flow to bring the pressure sensor to
near the recommended value.
• If the tractor has marginal flow available, or the list
circuit has priority, you may need to experiment with
combinations of fan flow and butterfly valve settings.
At excessive rpm, too much air flow can cause:
Symptoms of Insufficient Air Flow
• Excessive skips (low seed population) at seed meters.
• Blockage reported at fertilizer applicators.
• Plugging of delivery hoses at low spots.
Symptoms of Excessive Air Flow
• Blockage reported at openers or coulters.
• Plugging of delivery hoses near air boxes.
• oil heating
• slow lift times
Note: If desired pressure cannot be reached, or requires
unusually high oil flow at low butterfly valve
settings, chances are the fan is running
backwards. Reverse the inlet/return lines at the
hitch.
Butterfly Valve Operation:
To adjust, loosen bolt and rotate the handle .
Re-tighten bolt.
0° is wide open - maximum air flow.
90° is closed - minimum air flow.
The valve provides the most effect at settings between
20° and 70°.
Starting at 30° reduces the fan workload.
Starting at 45° provides the most adjustment range up or
Figure 8
Fan Butterfly Valve Handle
25137
1 2
1
2
20°
45°
70°