57
JOB FUNCTIONS
15.3.2 Home > Automatic functions > Nozzles selection
Enables / disables automatic nozzle selection on all spraying points (DEFAULT: ON).
AUTOMATIC NOZZLE SELECTION
When spraying starts (general command ON), VT automatically checks the
flowrates: if the necessary conditions are not met, VT signals this with the
screen of
MANUAL NOZZLE SELECTION
Allows to select manually nozzles in use on the spraying points.
The number of nozzles displayed will vary according to the spraying point setting
(par. 10).
Press the button next to the nozzle to enable or disable the corresponding nozzle.
“HOME” SCREEN
“HOME” SCREEN
AUTOMATIC
selection
Fig. 121
“HOME” SCREEN
“HOME” SCREEN
MANUAL
selection
Fig. 122
Fig. 123
Correct setting
Wrong setting
HOW THE AUTOMATIC NOZZLE SELECTION WORKS (SELETRON and DUAL BOOM SYSTEM)
In a traditional system, the farming machine speed limits depend on the minimum and maximum pressure of the nozzle in use and on the desired spray rate. For
instance, if we were spraying 100 l/ha with a violet evenfan nozzle ISO110025, the minimum operating speed shall be 6.9 km/h (corresponding to a pressure of 1 bar)
while maximum speed shall be 13.9 Km/h (corresponding to a pressure of 4 bars). This operation field can be restrictive for the features of both crop to be treated and
machine.
Operation field of possible combinations of ISO11002 and ISO110025 nozzles
When automatic nozzle selection is enabled, the VT (using Seletron devices) will enable the nozzle, or combination of nozzles, according to the set spray rate and
driving speed.
This system allows to widen the machine operating range, i.e. in the above instance, using ISO11002 yellow (
A
) and ISO110025 violet (
B
) nozzles, that work correctly
at a speed from 5.5 km/h to 24.9 km/h.
Nozzle A
Nozzle A
Nozzle B
Nozzle B
Fig. 124
Speed (km/h)
Fig. 125
According to the set data and those detected by the sensors, the monitor selects the suitable nozzle configuration constantly checking that:
- the spraying pressure always remains within the job features set for each single nozzle;
- in case of many possible nozzle configurations, the operating pressure of the configuration in use is as close as possible to the operating range of the nozzle;
- required number of nozzle changes is as low as possible.
When setting a spraying, make sure to couple compatible nozzles.
For example:
• Compatible nozzles
).
• NON-compatible nozzles:
).
In the same way, the overall rate of both nozzles at MINIMUM pressure shall be LOWER than the rate of the high rate nozzle at MAXIMUM pressure.
OK
Fig. 126
NO
Fig. 127
Quits without confirming the
changes
Saves the changes
Cancel
Exits
Confirm
Goes back to previous menu,
or scrolls the pages of a menu
(previous page)
Scrolls the pages of a menu
(next page)
Goes back to main screen
Saves the changes to current
page
Summary of Contents for 4679004
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