Siemens LMV5 Series - Determination of Maximum Cable Length; Cable Length Chart for SQM45...;SQM48...

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Building Technologies Division CC1N7550en
Industry Sector 24.05.2011
Power supply for the LMV5... system (cont´d)
The maximum cable length between power transformer and CAN bus users is depend-
ent on the type of cable (cross-sectional area), the number of actuators and the type of
actuator (supply current). The charts below can be used to determine the maximum
CAN bus cable lengths between the transformer and the group of actuators or display
and operating unit, depending on the influencing factors. The assumption is made here
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 length for the specified system cables AGG5.641 and AGG5.631 re-
sult from the points of intersection with the curves in the chart.
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
AGG5.631 AGG5.641
4
6
AGG5.631 (cable type 2)
AGG5.641 (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
755 0d13e/0308
Determination of the
maximum cable length
Diagram for cable
length
SQM45.../SQM48...