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Troubleshooting 37
TROUBLESHOOTING
Do not overlook the obvious. Check pump, boom
control valves, hoses, improper installation, etc.
The 8605 is easy to troubleshoot if you approach
it in an organized manner. There are four prima-
ry parts. 1) The 8605 Controller, 2) The Speed
Sensor, 3) The Flowmeter, and 4) The Servo
Valve. Your main objective when troubleshoot-
ing is to isolate the problem and find out which
of the four parts is defective.
The 8605 has been designed with internal and
external protective circuitry. These protective
circuits protect the controller from damage due
to shorts caused by pinched wires, or connec-
tors being plugged in wrong. Excessive current
draw from the servo valve is also protected.
If the controller display shows “Low Battery
Power” or is dead, turn the power switch to the
off (down) position for 1 or 2 minutes, then back
on. If the display is still dead, then disconnect
all cables except power from the controller and
try again. By trial and error you can find the bad
cable or device.
If your RATE or % ERROR becomes erratic, one
possible cause could be the servo valve is start-
ing to require excessive current to operate. The
controller will begin to protect itself by limiting
this current.
Extreme overheating of the controller will cause
it to shut itself off until the temperature is re-
duced.
The following table will help you avoid unneces-
sary testing by isolating the affected sensor(s)
and calibration numbers used for each mode.
The next step is to narrow the problem(s) down
to one of the two sensors. The top half of the
following table indicates which sensors are used
for the various modes.
For example, assume Total Gallons is not work-
ing properly. From the table we can see that only
one calibration number is used, the Pulses Per
Gallon.
First double check the calibration number, mak-
ing sure that it is programmed in correctly, then
check the flowmeter.
If the table indicates two sensors are used for
a mode, such as Rate Gal/Acre, then you can
isolate the faulty sensor by testing other modes
which depend upon only one of the sensors. Us-
ing the AREA or SPEED or DISTANCE modes
will test the speed sensor accuracy.
TROUBLE SHOOTING CHART
SELECTED MODE
SPEED
MPH
VOLUME
TOTAL
GALLON
AREA
TOTAL
ACRE
RATE
GAL/ACRE
GPA%
ERROR
DISTANCE
VPM
SENSOR
USED
SPEED
SENSOR
X
X
X
X
X
FLOWMETER
X
X
X
X
CALIBRA
TION
NUMBERS
DISTANCE CAL.
FACTOR
X
X
X
X
X
PULSES/GALLON
X
X
X
X
BOOM WIDTH
X
X
X