TeeJet 844-AB Sprayer Control - Manual (Page 12)

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844-AB
Automatic calibration
To automatically calibrate the radar speed sensor, mark a distance
of exactly 100 metres. Press the Plus and Minus keys
simultaneously to clear the contents of the display and to activate
auto calibration mode. Once auto calibration mode is activated,
“RAD” will be displayed on the lower left of the screen.
Figure 32: Radar speed sensor automatic calibration
CAL
118 rAd
1 2 3 4 5 6 7 8 9 10 11 12
Drive toward the initial point of the designated 100 metres. At the
starting location, press the Plus key once to begin the calibration
process. Continue driving the course. The 844-AB will count the
impulses as the sprayer moves. The speed at which the vehicle
travels is not important. As the ending point is reached, press
the Plus key again. The console will display the radar speed
calibration number.
NOTES: The radar speed calibration process should take place in a
field-like environment with the sprayer tank at least half full.
It is recommended to repeat the radar speed calibration
process at least twice and use an average of the speed
calibration numbers.
Manual calculation
It is not possible to manually calculate the calibration value of a
radar. However, the value can be entered manually if it is known
from a prior calibration. To manually enter the radar calibration
value, press the Auto/man key to enter Radar mode. Once radar
calibration mode is activated, “RAD” will be displayed on the lower
left of the screen. Use the Plus or Minus keys to adjust the
value. Press the Programme key to save the value and advance
to the next programme step.
Simulated ground speed
Simulated ground speed allows the console and sprayer to be tested
(and actually spray water) without physically moving the sprayer.
This can and should be tested prior to any spraying activity.
The 844-AB has a low and high simulated ground speed. This allows
the operator to switch between the two to simulate a speed change
and ensure the console is regulating properly during the sprayer
checkout.
Figure 33: Simulated ground speed
Km/H
SPD
LO
SIM
9.7
1 2 3 4 5 6 7 8 9 10 11 12
Km/H
SPD
HIgH
SIM
9.0
1 2 3 4 5 6 7 8 9 10 11 12
To enter simulated speeds, determine whether the low or high
simulated speed is displayed on the console. Change from low to
high by pressing the Auto/man key.
Use the Plus or Minus keys to adjust the values. Press the
Auto/man key to switch to the other setting (either low or high)
and adjust the value with the Plus or Minus keys. Once both
values are entered, press the Programme key to advance to the
next step.
The console will display the simulated speed upon exiting System
Setup mode. The simulated speed will remain on the Operation
mode display until the console receives actual speed impulses. While
in Operation mode, with the Master switch in the “On” position, press
the Programme and Minus keys for low simulated speed;
press the Programme and Plus keys for high simulated speed.
NOTES: The simulated speed feature will be deactivated once
the sprayer begins moving and the 844-AB receives actual
speed impulses. If a radar speed sensor is being used,
disconnect the radar connection from the main console. Any
movement can disable the simulated speed test due to the
sensitivity of the speed sensor.
The LOW SIMULATED SPEED will be used during the first
3 seconds after Master is set in the ON position whatever the
real forward speed. This will help starting a new row in the
best conditions.