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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 12 Mounting, electrical installation and service 13.08.2004
The maximum cable length between transformer and CAN bus users is dependent on
the type of cable (cross-sectional area), the number of actuators and the type of actua-
tor used (current).
The following graphs can be used to determine the maximum CAN bus cable lengths
between the transformer and group of actuators or the AZL5…, depending on the rele-
vant influencing factors.
The assumption was made that the actuators within the group are close to one another.
The
minimum cross-sectional area for the system examples shown results from the
start of the curve.
The
maximum cable lengths for the defined system cables AGG5.640 and AGG5.630
result from the points of intersection in the graph.
50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
0.5 1.25
2
3
5
7
8
AGG5.630 / 631 AGG5.640 / 641
4
6
AGG5.630 / 631 (cable type 2)
AGG5.640 / 641 (cable type 1)
1
1 x SQM45
2
2 x SQM45
3
3 x SQM45
4
4 x SQM45
5
2 x SQM48
7
2 x SQM45 + 1 x SQM48
8
3 x SQM45 + 1 x SQM48
6
1 x SQM45 + 1 x SQM48
Cross-section area in mm
2
Maximum cable length in m
7550d13e/0204
CAN bus connection between transformer and actuator group
When connecting a PLL52... O2 module, the maximum permissible cable
length of a network is to be reduced by 2 m.
Example: - System cable: AGG5.640 (connecting cable to the actuators)
- Actuators: 2 x SQM45...
The point of intersection of the vertical line for the AGG5.640 (1.25 mm
2
) and curve §
(2 x SQM45...) gives a maximum cable length of 33.4 m between the transformer and
the group of actuators.
The minimum cross-sectional area is 0.33 mm
2
.
Determination of the
maximum cable length
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