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Verfügbare Sprachen
Verfügbare Sprachen
COMMUNICATION BUS NETWORK
The cables of the bus network (transmission line) must be laid in
such a way as to avoid electromagnetic interference.
Do not lay transmission and power cables in the same conduit.
Connect the cables as follows:
•
The combinations between internal and external sections
must be the same in terms of the refrigerating connections
and electrical connections.
•
Use the "in and out" type of connection even if the lines work
with connection in parallel.
•
In case of connection with a controller of a higher level
(centraliser), a transmission line is required between each
external line.
•
Do not connect the power cables to the terminal block of the
bus network.
•
Do not perform joints but only carry out soldering using a
heat shrink sheath. Respect the lengths indicated in the
technical manuals.
•
Junction boxes are not allowed.
•
Correctly address the components of the system.
•
The cable used must be of a type suitable for data
transmission with RS 485. If not suitable for such use it can
cause interference and difficulties in the transmission of
packets.
•
The insulation and voltage characteristics of the cable must
be in accordance with the electrical regulations in force.
•
The insulation of the cable must have flame or fire retarding
characteristics, commensurate with the electrical standards
of reference for the type of system used.
•
The cable must be laid to standard.
•
The cable must be laid separately from other cables,
especially from power cables or from cables of different
voltages.
•
The cable must be laid far from cables or devices that can
cause electromagnetic interference.
•
The RS485 serial line must always be of the "Bus in-out"
topology. Different topologies are not allowed (star or ring-
type, etc.).
•
The serial line must be laid by personnel trained and
qualified in data communication networks.
CAUTION
Connecting the shield
•
For the bus network, use 0.75 mm
Using other types of cables may result in interference or
malfunctions.
•
The shield of the bus cable used for serial communication
must be connected to an earth free from interference.
•
The shield must be earthed at one point only.
•
The continuity of the shield must be ensured the entire
length of the bus cable.
These requirements are generally valid.
In some areas characterised by the presence of particular types of
EMI coupling, a different type of connection of the shield may be
required.
Make sure that the metal braiding of the cables does not touch any
live points.
Use dedicated wire terminals.
4
21
2
-pole shielded cables.
WARNING
CAUTION
(MODBUS)
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