chatron miiBIO, Quick Start Manual, Page: 6 / 12

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Any damage caused by inattention to these notices
will not be covered by the warranty.
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MC4
Multibreach
Connector MC4
Multibreach
Connector
Figure 7 - Connection diagram of photovoltaic panels
The photovoltaic panels used to power the
Biocooler have a nominal power of 250Wp at
270Wp. They are connected in a parallel of two
series (positive terminal with negative) and can
produce about 76 VDC, open.
It is recommended to use MC4 type connectors
and suitable cable for photovoltaic installations
with UV protection, with a minimum cross-section
of 4 mm2. The greater the distance between the
fan and the photovoltaic panels the greater the
section should be, to avoid large voltage drops.
5.1.3. Biocooler links
In order for Biocooler to work in the right direction, you
must make sure to connect:
•
The motor power cable to the respective motor terminals,
in the frame of the Biocooler (U, V, W), please check the
direction of rotation, if necessary change a phase;
•
The power cable of the control board to the terminals of
the board, in the frame of the Biocooler (F, N, T);
•
The motor speed signal cable to the signal terminals on the
Biocooler board (AV, BV, COM), together with the interfa-
ce relays.
Figure 8 - Identification of cables and terminals to be connected in the Biocooler.
5.2 Earth connection, lightning protection
Due to their exposure PV systems are subject to the
effect of direct atmospheric discharges or surges due
to indirect discharges in the vicinity of the installation.
Precautions should be taken to prevent or limit the da-
mage caused by them.
Caution: Local laws, regulations and good practices
for protection against direct and indirect atmospheric
discharges should be followed.
To mitigate the effects of indirect lightning strikes:
•
Connect all metallic structural elements of the photovol-
taic panels to each other and the ground bus, in order to
create an equipotential bond between all the elements.
Proper grounding is important, allowing static electricity
to discharge to the earth - preventing lightning.
•
It is recommended to use connecting conductors with a
minimum cross-section of 10 mm2 (copper).
• It is recommended that the conductive wires of the pho-
tovoltaic panels be put together in order to avoid inducti-
ve phenomena of indirect discharges.
• It is recommended that the elements of the photovoltaic
panels be separated from the atmospheric discharge
systems.
• It is recommended to use shielded cables in exposed
locations and / or over long cable distances.
If the building does not have a lightning protection
system, the support structure of the photovoltaic
generator must be connected to the ground bus
and incorporated in the equipotential bonding.
If there is a protection system against direct at-
mospheric discharges already implemented in
the building, all metallic structural elements of the
photovoltaic panels must be connected to it and
by the shortest possible path. The goal is to pre-
vent the beam from being able to directly reach
the photovoltaic module. The distance between
the photovoltaic generator and the shaft should
be greater than 2 meters in order to avoid lateral
discharge to the generator.
6 - Maintenance
Caution: All maintenance must be carried out by qua-
lified personnel in accordance with local laws, regula-
tions and good practice.
Each photovoltaic panel produces a voltage greater
than 35V, even without load. Care must be exercised
when handling all elements that are in contact with
their terminals.
On the electric panel will be a DC Booster that will
raise the photovoltaic voltage to about 440 Vdc. There
is danger of serious injury, even death. There is a war-
ning sign on the equipment.