CONDITION POSSIBLE CAUSES SOLUTION
6 Actual total volume applied in GPA, A Speed sensor not calibrated correctly. Recalibrate the magnetic or radar speed pulses in
G/1000 ft
2
, or l/Ha does not match the the Calibrate Speed section of the System Setup
total area covered. Mode on page 18-19 of the 844 Installation Manual.
B Incorrect nozzle spacing Check the Nozzle Spacing section in the System
Setup Mode on page 15 of the 844 Installation
Manual to ensure the correct nozzle spacing
has been entered. This number should reflect
the distance between nozzles in inches (cm)
on the boom.
If banding, enter the band width as your spacing.
If directed spraying enter the row spacing divided by
the number of nozzles per row.
C Incorrect capacity nozzles The Nozzle Selection section in the Application Setup
Mode on page 24 of the 844 Installation Manual does
not match closely enough to the tips on the boom.
Compare the value in this section with the flow rate of
the nozzles being used at
40 psi (2 bar).
D Flow meter pulses incorrect In the System Setup mode, move to the Flow meter
Pulses section on page 14 of the 844 Installation
manual. Enter the factory flow meter pulse rate
located on the tag accompanying the flow meter.
It might be necessary to recalibrate the flow meter.
Follow the flow meter calibration procedure(s) on page
35 and 36 of this manual.
E Speed sensor installed incorrectly One or more of the wheel sensor magnets are not
consistently sending a pulse to the monitor.
The distance between the sensor and the magnets is
incorrect. Ground debris can accidentally move the
sensor out of position. The red LED on the back side
of the sensor should be lit when placed within the
correct distance form the magnets.
A proximity sensor has an orange LED on the top of
the sensor that should be lit when placed within the
correct distance from the sensing surface.
F Radar installed incorrectly Precise installation of the Radar is critical to it working
correctly. Thoroughly review the manual provided with
the Radar sensor you are using.
6 No regulation in Auto Mode A No speed sensing Check speed sensor to ensure it is sending pulses to
the controller. Check the Calibrate Speed section in
the System Setup Mode on pages 17-20 of the 844
Installation Manual to ensure speed sensors are
correctly calibrated.
B Regulating valve malfunction Check wiring from controller to the regulating valve.
Make sure there is voltage to the
regulating valve.
Both wires leading to the regulating valve are 12V(+).
With the Master Switch on, and the console set to
MAN Mode when either the or key is
pushed, the appropriate wire goes to ground (–)
to complete the circuit.
34
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