Air system adjustments, Air system settings, Fan speed suggestions – Great Plains NTA2007 Operator Manual User Manual
Page 91
Great Plains Manufacturing, Inc.
Adjustments
87
2012-01-05
166-372M
Air System Adjustments
There are two adjustments for the air system:
1.
Fan rpm (this page),
which controls manifold air pressure, hopper air
pressure, and material delivery velocity.
2.
Inlet Manifold Diverter angle (page 89),
which controls the balance of air flow to each meter
on dual-hopper drills (whether single- or double-
shoot). This adjustment is not present on single-
hopper drills.
There is no direct adjustment for hopper pressure. The
table figures are included for setting alarm limits in the
seed monitor. If a pressure alarm occurs, do not adjust
the fan or diverter to compensate. The cause is usually a
leak or a major blockage.
Fan Speed Suggestions
The specific fan rpm required varies considerably with
drill configuration, material density, application rate, field
speed and material properties. Develop and record
settings that are suitable for your operations.
Machine Damage Risk:
Always engage the fan with the tractor at a low engine speed.
Engaging the fan when the tractor is at high speed may cause
fan damage. Do not reverse hydraulic flow with the fan
running.
At ideal fan speed:
• flow is more than high enough to avoid blockages
(from both meters on dual-hopper drills),
• flow is even across all hoses from each meter; and,
• flow is low enough to minimize seed cracking and
bounce.
Fan speed is monitored and reported by the seed
monitor, but is manually controlled.
If the fan cannot reach 3000 rpm, one or more hoses
may be mis-connected. Air moves toward the air box in
either rotation direction, but reverse spinning airflow is
too low to operate the system.
If the fan is operating properly, and at desired rpms, and
the diverter is correctly adjusted, but the pressure gauge
is out of limits, see “Magnehelic® Gauge
Troubleshooting” on page 108.
Air System Settings
Fan RPM
Limits
Minimum
Maximum
2000 rpm
to
4500 rpm
Typical Range
Minimum
Maximum
Milo
3250 rpm
to
4000 rpm
Soybeans
2750 rpm
to
3500 rpm
Sunflower
2250 rpm
to
3000 rpm
Wheat
3250 rpm
to
4000 rpm
Typical Range
Minimum
Maximum
12 in H2O
to
25 in H2O
30 cm H2O
to
64 cm H2O
30 kPa
to
64 kPa
3050 bar
to
6350 bar
4.4 psi
to
9.2 psi
Alarm Limits
Minimum
Maximum
1.3 kPa
to
8.6 kPa
130 bar
to
860 bar
13 cm H2O
to
88 cm H2O
0.19 psi
to
1.25 psi
5 in H2O
to
35 in H2O
31184
Manifold
Pressure
Hopper
Pressure
Limits
Figure 66
Dual Manifold Pressure Gauges
31189