33
Pre-Field System Checkout
-
Bypass Servo
Before beginning actual spraying, perform the following “pre-
field” procedure to ensure that your valve settings, nozzle
selection and desired speed range will allow the SprayMate II to
provide the required application control.This procedure should
be repeated for each new nozzle selection and/or application
rate. By performing all of the steps listed below, you set up your
system to allow the SprayMate II to perform at optimum level.
Fill your sprayer tank with clean water. DO NOT use chemicals
until the entire system is completely checked out and
operating properly.
IMPORTANT NOTE: Most nozzles will maintain a good pattern
over a maximum speed range of two to one. (For example, if
your maximum speed is 12, your minimum speed shouldn’t go
below 6.)
NOTE: Pre-field System Checkout is a procedure performed
while the console is in the CAL mode. The Red WARNING light
will be lit during the procedure and “CAL” on the display will be
flashing.
Completely close range adjust valve (if installed), and agitation
valve (if installed). Completely open throttle valve (must be
installed).
Start vehicle and pump, bring the engine up to normal
operating RPM. Do NOT exceed safe system pressure.
ENTER MAXIMUM APPLICATION TEST SPEED INTO
CONSOLE.
With console in HOLD, enter calibration mode.
Push and hold (CAL) button. The CAL icon will appear on
display and red light will be on. Turn rotary switch to TEST
SPEED position. Use “+” or “-” button to enter maximum
application speed. Do not exit calibration mode. CAL will flash
on the display indicating TEST SPEED mode.
Select manual “MAN” control mode and turn all booms ON.
T
ur
n r
otary switch to APP. RATE position and hold “+”button for
approximately 30 seconds to completely close the servo valve
(c
on
tr
ol valve).
NO
TE:
assume ser
v
o is plumb
ed in a bypass
line
.
(M
aximum b
ypass allowed - minimum flow output to
booms.)
CAN’T GET THERE? If you can’t get to the desired appli-
cation rate, you may need different nozzles, pump, or you may
need to make modifications to your plumbing configuration.
Please refer to Troubleshooting Plumbing on page 39.
Adjust agitation valve for desired agitation. If range valve is
installed, adjust range valve until display reads 20% higher
than the desired application rate.
Slowly close the throttle valve until the display reads slightly
higher (5% to 10%) than the desired application rate. If the
throttle valve is more than two-thirds closed, install range valve
and perform pre-field again.
• Now is a good time to confirm that GPA, GPM, MPH, WIDTH
and PSI all coincide with the nozzle manufacturer’s charts. PSI
may be slightly higher than indicated by the charts due to
pressure drop across the solenoid valves, nozzle diaphragm
check valves, nozzle screens, etc.
ENTER MINIMUM APPLICATION TEST SPEED INTO
CONSOLE. Turn rotary switch to TEST SPEED position. Use
the “+” or “-” button to enter minimum application speed. Do
not e
xit calibration mode. (Remember, the minimum
application speed is not normally less than half of the
maximum application speed.)
Turn booms ON (make certain system is in Manual mode), turn
rotary switch to APP. RATE position and hold “-” button for
approximately 30 seconds to completely open the servo valve
(control valve).
NOTE: assume servo is plumbed in a bypass
line. (Maximum bypass allowed - minimum flow output to
booms.) The display should now read less than the desired
application rate.
• It is not normally a problem if the application rate goes all the
way to zero when holding the “-”button for 30 seconds,as long
as it goes back up when the “+” button is held.
CAN’T GET THERE? If holding the “-” button does not get
the applic
a
tion rate to go below the desired application rate,
please refer to Troubleshooting Plumbing
.
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