10
4.4. CONNECTION OF UNITS AT 12 Vdc
The unit has to be installed following the prevail-
ing regulations for electrical installations. The unit will
not be completely protected if it is not used accord-
ing to the information given in the manual.
The unit has to be placed in such a way that the
elements which may get interferences, such as the
sensor inputs, the sensor power supply, the links to
the PC and modem, have their cables in the best
emplacement, so that they do not receive interfer-
ences from power elements which might be in their
surroundings.
All the connection terminals of the Agrónic 4000
can be switched which allows a fast maintenance.
PROGRÉS also offers a protection box for all the
terminals, in case there is a high risk of electrical
sparks from storms entering the cables.
4.4.1. Power connection
Before connecting the unit, it is necessary to
check its identification label where the characteristics
of the power supply are to be found.
The power supply is at 12 Volts of direct current.
Connect the positive and negative poles on the
battery to the positive (+) and negative (-) terminals
marked as “+12 Vdc”.
A 6 Amp magneto-thermal switch is to be in-
cluded in the installation. It will be used as a discon-
nection device and it has to be placed near the unit
at an accessible place for the user.
It is recommendable to do this as directly as
possible, avoiding that the same cable supplies
other devices. Use cable of the H05VV-F type, 1mm
2
.
The power supply input is protected by a fuse,
marked as General Fuse and a varistor. The varistor
might short-circuit the fuse automatically, on detect-
ing an overload on the line (lightning, etc.). Replace
it with one of the same characteristics.
4.4.2. Digital input connection
The different elements of the installation, such
as pressure gauges, levels, meters, etc. are to be
connected to the group of 12 terminals labeled as
“Digital inputs (D)”. This is done by connecting one
contact pole to the corresponding input and the other
pole to the “
NEGATIVE
” of battery.
Contacts must normally be open and free of volt-
age.
One of the 48 possible functions can be assigned
to everyone of the inputs in the section “Parameters -
Sensors”.
4.4.3. Output connection
All outputs are ready to work at 12 Vdc (it is very
important not to supply the unit with voltages above to
30 V).
Connect the solenoids, relays, etc., between the
output “COMMON O” and the correspond-
ing output.
Do not exceed the maximum power by output of 1
Amp. and the general of 6.3 Amp. If this happens insert
external relays.
The “output fuse” protects from overloads and
short-circuits; to replace it half turn the cover of the
fuses box and replace it by another one of similar char-
acteristics.
The “AUX” terminal corresponds to the “Negative”
of the 12 Vdc which goes through the fuse. It will be
useful to connect auxiliary elements of manual com-
mand and extensions of relays above to 32 outputs.
The outputs are isolated from the internal circuitry
by relays and protected by a varistor at everyone of
them, plus a general gas discharger in the lines of 12
Vdc.
The number of outputs can vary from 16 to 24, 32,
48, 64, 80 or 96 in the same unit. It is possible to extend
the outputs at a distance, in external modules “via ra-
dio” or “via cable”. The maximum number of sectors to
be controlled by the Agrónic 4000 is 99.
Every output can be assigned to an irrigation sec-
tor (one or more electrovalves) or to a general output
(pumps, filters, mixers, etc.). To do so, go to the section
of “Parameters - Sectors” or “Parameters - Generals”.
