Hardi ZENIT A750, Инструкция

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EVC/2
Electrical operating.
By way of an electrical control box fitted to the tractor, the swit-
ches that open or close the sections individually or together are
activated. The control box is also fitted with another switch to in-
crease or decrease pressure.
The functions of the control box are described below:
Switch to increase or decrease pressure.
Main On/Off Switch
Switch to open left-hand section.
Switch to open right-hand section.
Inside the box is the electronic circuit board and fuses for each
motor. Inside the box there are two spare fuses.
It is of utmost importance for the operating unit to be well
adjusted. For this reason, before using the equipment for
the first time, it is necessary to adjust the pressure equali-
sation valve.
During this procedure, the return manifold of each section is regu-
lated, so that it returns the same amount of liquid to the tank as is
expelled through all its nozzles when open.
This avoids variations in pressure when one or two sections are
shut off.
The regulation procedure is the following:
1. Open the two sections and on the electrical control box.
2. Put the pressure at, for example, 3 bar.
3. Close one of the sections.
4. With the pressure equalisation valve
of the closed section,
adjust the pressure until the pressure gauge indicates 3 bar.
5. Open the section again and repeat the operation with the other
section.
6. Carry out a test by opening the two sections at the same time
or one by one. If the operating unit is perfectly adjusted the pres-
sure ought to be the same.
It is recommendable to carry out this adjustment at as near a pressure as that at which the equipment is
going to work.
Carry out this adjustment every so often as somebody may accidentally change the position of the pressure
equalisation valve.
A
B
C
D
E
E
3 - Description
3.9
B
A D C
D C