Siemens LMV5 Series Manual page 18

Power supply for the LMV5... system (cont´d)
Determination of the
maximum cable length
Diagram for cable
length
SQM45.../SQM48...
18/39
Building Technologies Division
Industry Sector
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
AGG5.631
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
0.5
AGG5.631 (cable type 2)
AGG5.641 (cable type 1)
1 x SQM45... 2 x SQM48...
1 5
2 x SQM45... 1 x SQM45... + 1 x SQM48...
2 6
3 x SQM45... 2 x SQM45... + 1 x SQM48...
3 7
4 x SQM45... 3 x SQM45... + 1 x SQM48...
4 8
AGG5.641
1.25
Cross-section area in mm
2
CC1N7550en
24.05.2011