Progres AGRONIC 4000 Instruction Manual page 7

4.3. CONNECTION
The unit has to be installed following the
prevailing 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
emplacement, so that
interferences 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.
4.3.1. 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 standard power supply is at 230 Vac, being
neutral to the terminals marked as "N" and "F".
A 6 amp magneto-thermal switch is to be
included in the installation. It will be used as a
disconnection 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
The power supply input is protected by a fuse,
marked as General Fuse and a varistor.
The varistor might
automatically, on detecting an overload on the line
(lightning, etc.). Replace it with one of the same
characteristics.
For unstable or fluctuating voltages use grid
stabilizers.
4.3.2. Earth terminal connection
The "built-in" model has a terminal screw to
connect the protection earth terminal (in the "box"
model it is not necessary as it has not got a metallic
casing). A pressed terminal will be applied to the
cable when joining it to the screw.
The box terminal marked as
connected to the filters and protections.
Both the earth and the box terminals are used to
screen the circuitry, for this reason, it is very important
they do not receive
possible at 115
Vac. but it
necessary to ask
Progrés about this
last one.
Connect the
phase and the
power supply
2
.
short-circuit the fuse
is internally
that the earth line is correctly installed and free of
electric noise. It is also used to protect the unit by
directing all electrical sparks through the internal gas
discharger to the earth. These sparks can come in
through the output cables when lightning strikes
during a storm.
4.3.3. Digital input connection
The different elements of the installation, such as
pressure gauges, levels, counters, 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
is
the 24 Vac "COMMON".
Contacts must normally be open and free of volt-
age.
One of the 44 possible functions can be assigned
to everyone of the inputs in the section "Parameters-
Inputs".
The inputs are optically isolated from the internal
circuitry and depend on the same 24 Vac power
supply of the outputs.
4.3.4. Output connection
All outputs are ready to work at 24 Vac (it is very
important not to supply the unit with voltages above to
30V).
The unit must have a external transformer with 24
Vac output and double isolation according to the UNE
EN61010 norm. Its input will be connected to the out-
put of the magneto-thermal switch which protects the
Agrónic 4000. The 24Vac output is connected to the
terminals marked with this voltage, entering a pole of
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