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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 12 Mounting, electrical installation and service 13.08.2004
12.1 Power supply to the LMV5... system
In principle, the CAN bus topology always has a line structure and, therefore, has a
start and an end node.
The individual CAN bus users are connected in series, whereby the respective end nodes
are terminated by CAN bus terminating resistors.
The basic unit is a component of the communication line and is looped in between the
AZL5… and the actuators.
In the system, the AZL5… always assumes the function of a CAN bus end node. The
required CAN bus terminating resistor is already integrated in that case.
With the actuators, the last user becomes the CAN bus end node (here, the internal
CAN bus termination must be activated via a connecting plug).
The other node users within the line structure are configured without terminating resis-
tor.
Installation of all components in the burner;
CAN bus cable «LMV5…
↔ ACT» < 20 m
X50
RAST3.5
Trafo
X52
Power trafo 1
AGG5.2...
12 V
AC1 12 V
LMV5... basic unit
CANH
F1 T6.3
X10-01
F3 T4
X51
Max. bus cable length
LMV5...-AZL51...: 80 m
AGG5.630 / 631
Sub-D
connector
AZL5...
AC1 12 V
AC2 12 V
CANL
CANH
GND
Shielding
12 V
230 V
12 V
Power supply
max. 3 m AC2 12 V
M
CANL
X3-04
N L
7550a03e/0304
Fixed internal
bus termination
Jumper
Max. bus cable length
LMV5...-SQM4...: 20 m
AGG5.640 / 641
ACT 4
SQM4...
ACT 3
SQM4...
ACT 2
SQM4...
ACT 1
SQM4...
No bus
termination
AC1 12 V
AC2 12 V
CANL
CANH
GND
Shielding
F2 T4
No bus
termination
No bus
termination
Bus
termination
Total length of CAN bus cable ≤ 100 m
Example 1
Note on example 1
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