12
4.5. CONNECTION OF UNITS AT DOUBLE
VOLTAGE
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 according
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 em-
placement, so that they do not receive interferences
from power elements which might be in their sur-
roundings.
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.
4.5.1. 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 nega-
tive poles on the
battery to the posi-
tive (+) and nega-
tive (-) 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 pos-
sible, 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 detecting
an overload on the line (lightning, etc.). Replace it with
one of the same characteristics.
4.5.2. Digital input connection
The different elements of the installation, such as
pressure gauges, levels, meters, etc. are to be con-
nected 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 every one of the inputs in the section “Parameters -
Sensors”.
4.5.3. Output connection
In double-voltage equipment, the first four out-
puts operate at 12 Vdc (- negative) and the remainder
at 24 Vac (it is very important not to supply the unit
with voltages above to 30 V).
Connect the solenoids, relays, etc. between the
output common “OUTPUT ” and their
corresponding output, except for the first four outputs,
whose common will be the battery’s positive pole.
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 cha-
racteristics.
Outputs 1 to 4 control the diesel engine and op-
erate at 12 volts. They are grounded by an interior
thermal fuse.
The “AUX” terminal corresponds to the “PHASE”
of the 24 Vac 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.
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 radio” 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 sec-
tion of “Parameters - Sectors” or “Parameters - Gen-
erals”.
When a diesel engine is controlled in equipment
outfitted with “double-voltage”, it is necessary to as-
sign outputs for the contact, start-up, stopping, and
pre-heating mechanisms in the first four outputs.
