Installation, user and maintenance manual
– GAHP-A
57
Terminal nodes are appliances or DDCs that are connected to one other element
•
only.
Intermediate nodes are appliances or DDCs that are connected to two other
•
elements.
The diagram in Figure 6.8 Example of CAN BUS
→
48 gives an example of a CAN BUS
network: 3 appliances are connected to each other and to 1 DDC. Appliance D and the
DDC (A) are terminal nodes, while appliances C and B are intermediate nodes as they are
connected to 2 elements.
It is possible to place one DDC at any point of the CAN bus network: appliances and DDCs
may act equally as terminal or intermediate nodes. One DDC can control and monitor up
to 16 appliances. If there are more than 16 appliances on the network, it is necessary to
connect more than one DDC on the same network, up to a maximum of 3.
What is the CAn BUs cable
The cable to be used must be suitable for CAN BUS applications.
Table 6.2 CAN BUS cables type
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48 gives details of some types of CAN bus cable, grouped
according to the maximum distance covered by each single type.
For overall distances to cover of ≤200 m and networks with a maximum of 6 nodes (a typ-
ical example: up to 5 GAHP + 1 DDC) a simple shielded cable 3x0.75 mm may be used.
As shown in Table 6.2 CAN BUS cables type
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48, the CAN connection requires a CAN bus
cable with 3 wires. If the available cable has more than 3 coloured wires, use the wires
with the colours indicated in 6.2 CAN BUS cables type
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48 and cut the remaining ones.
The ROBUR NETBUS cable is available as an accessory, see Section 8 ACCESSORIES
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77.
How to connect the CAn BUs cable to the appliance's electronic board
The CAN BUS cable must be connected to the dedicated terminals on the appliance’s
electronic board, as shown below (see Figure 6.9 CAN BUS cable connection
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49).
Before working on the electrical panel of the appliance, make sure that power supply is
off.
Cut a length of cable long enough to allow installing it without kinking.
1.
On one end of the cable, remove the jacket for a length of approximately 70-80
2.
mm, taking care not to cut the shielding (metal mesh and/or aluminium sheet and,
if present, the bare connector in touch with the shield) and the wires contained
within.
If the cable is too thin to be held in place in the cable holding bracket (detail C in
3.
Figure 6.9 CAN BUS cable connection
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49), make it thicker by wrapping insulat-
ing tape around the jacket close to the stripped part (to an approximate diameter
of 12-13 mm).
Pull back the shielding on the jacket; apply isolating tape to the end of the shield-
4.
ing as pulled back (detail A, Figure 6.9 CAN BUS cable connection
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49).
If the appliance is a
5.
terminal node of the network connect the three coloured
wires to the orange connector as shown in detail "A" of Figure 6.10 Electrical wir-
ing diagram
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50. Respect the correct indications L, H, GND provided in Table 6.2
CAN BUS cables type
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48, on the figure and on the electronic board below the
connector.
