Flint & Walling Commander 3 Manual page 6

• Using a 7/32" Allen-wrench (2), turn the adjusting screw
clockwise to increase pressure and counter-clockwise to
decrease pressure. The adjustment range is between 25 and
80 psi (1.7 and 5.5 bar). Note: 1/4 turn = approximately 3 psi
(0.2 bar).
• Replace the rubber end cap.
• Cover the pressure switch terminals with the rubber boot
provided. Do not place boot in direct sunlight.
IMPORTANT: Do not exceed the mechanical stop on the
pressure sensor.
Pressure Transducer: When using a 4-20 mA pressure
transducer, the desired system pressure is set by using the
pressure setpoint adjustment knob. The knob is factory set to
50% of the transducer range and is adjustable from 10% to 90%
in 5% increments. This allows any range of pressure transducer
to be used. Refer to the indicator lines surrounding the knob and
the corresponding legend printed on the divider when setting the
desired pressure setpoint.
PRESSURE
SETPOINT
Refer to the following table for percentage to PSI conversions for
popular transducer ranges.
%
100
10
10
15
15
20
20
25 25
30 30
35 35
40 40
45 45
50 50
55 55
60 60
65 65
70 70
75 75
80 80
85 85
90 90
The pressure setpoint must be adjusted with the drive powered
OFF. The new setting will not take effect until the drive power is
cycled.
Transducer Range
120 150 300
12 15 30
18 22 45
24 30 60
30 37 75
36 45 90
42 52 105
48 60 120
54 67 135
60 75 150
66 82 165
72 90 180
78 97 195
84 105 210
90 112 225
96 120 240
102 127 255
108 135 270
Flint & Walling © Copyright 2024. All rights reserved.
NOTE: This knob is only compatible with a 4-20 mA pressure
transducer. A pressure transducer must be installed in the
system, and DIP SW2 Position 1 must be in the XDCR (RIGHT)
position.
Drawdown Feature (DIP SW2 – Pos. 5)
When using a pressure transducer, the default cut-in pressure
is 5% of transducer range below the system pressure setpoint.
Setting DIP SW2 Position 5 in the DD (RIGHT) position will
change the cut-in pressure to 20% below the system pressure
setpoint.
The 20% setting can be used to allow for more water to be drawn
from the tank. For example, a system setpoint pressure of 50
PSI and the cut-in pressure at 20% would be 30 PSI. This would
cause the drive to maintain system pressure at 50 PSI when
running, but when the system is standby, the drive will not start
the motor until the system pressure drops below 30 PSI.
(RIGHT) position. The new setting will not take effect until the
drive is powered up.
IMPORTANT: The pre-charge of the pressure tank should be less
than the cut-in pressure when to prevent emptying the pressure
tank.
Additional Performance Settings
Underload Sensitivity
UNDERLOAD
The Commander 3 is configured at the factory to ensure
detection of Underload faults in a wide variety of applications. At
times (as in shallow wells with some pumps), this trip level may
result in unnecessary faults. If the pump is installed in a shallow
well, let the drive run and observe system behavior. Once the
system begins to regulate pressure, check operation at several
flow rates to make sure the default sensitivity does not cause
nuisance Underload faults.
NOTE: When set for use with an above ground pump, the drive
includes a set delay to allow the pump to fully prime. Each time
the pump is started, any underload condition will be ignored for a
period of two minutes to allow the pump to prime.
If it becomes necessary to adjust the Underload trip level, power
down and wait ten minutes for the controller to discharge the
stored energy. Once the internal voltages have dropped, locate
the Underload Potentiometer on the upper-right corner of the
Interface Board.
Shallow Set: If the pump is installed in an extremely shallow or
artesian well and the controller trips on an underload fault, the
Underload Potentiometer will need to be turned counterclockwise
to a drop the sensitivity setting. Check operation of the system
and repeat as necessary.
Deep Set: In cases where the pump is set very deep, run the
system at open discharge to pump the well down and observe to
make sure that an underload is detected properly. If the system
does not trip as it should, the Underload potentiometer will need
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