14
5
USE
For detailed information on operation or adjustment of unit valves, ALWAYS refer to
the operating and maintenance instructions manual relevant to your control device.
Pressure readings are indicated by the pressure gauge or displayed at the control
device (where unit is equipped with a pressure transducer).
5.1
Calibration of operating pressure
1
Select the type of nozzle and the relative operating pressure according to the litres/hectare
(l/ha) to be sprayed and the speed of progress.
2
With the machine off, start the pump and take it to its operating level.
3
Close the discharge valve with the switch on the control unit
(set to OFF): this delivers product to the unit.
4
Set the relevant switches on the control device to "ON" to open all
section valves.
5
Now set the unit’s pressure to the spraying value.
The operating pressure is set with the proportional valve: proceed as follows, depending on the type of
valve mounted to the control unit, to set the desired operating pressure.
•
manual proportional valve:
turn the knob on the valve itself.
- clockwise to increase the pressure;
- anticlockwise to decrease the pressure.
•
proportional electric valve:
use the respective switch on the control unit.
- push up to increase the pressure;
- push down to decrease the pressure.
In this case, the propor
-
tional valve must be used
for pressure adjustment
and not the maximum pressure
valve since the proportional
valve would not compensate
the variations in speed correctly
should the operating pressure
be too close to the calibration of
the maximum pressure valve.
