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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 12 Mounting, electrical installation and service 13.08.2004
Basic unit LMV5... in the control panel, actuator on the burner;
CAN bus cable «LMV5...
↔ SA» > 20 m
Jumper
Max. bus cable length
ACT4 - ACT1: 20 m
AGG5.640 / 641
Max. bus cable length
LMV5...- ACT1: 75 m
AGG5.640 / 641 or
AGG5.630 / 631
Only
CANH
CANL
GND
Max. cable length
of power supply
for actuators 3 m
F T4
AC1 12 V
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...: 5 m
AGG5.630 / 631
Control panel
CANL
CANH
GND
Shielding
5
12 V
230 V
12 V
ACT 4
SQM4...
ACT 3
SQM4...
ACT 2
SQM4...
ACT 1
SQM4...
No bus
termination
230 V 12 V
F T2
N
F T4
AC2 12 V
Power supply
max. 3 m AC2 12 V
M
CANL
555
3
3
X3-04
N
Not used
L
M
7550a04e/0304
L
AC1 12 V
AC2 12 V
CANL
CANH
GND
Shielding
Sub-D
connector
Fixed internal
bus termination
AZL5...
F2 T4
Power trafo 2
AGG5.2...
Burner
Bus
termination
No bus
termination
No bus
termination
Total length of CAN bus cable ≤ 100 m
Whenever the distance between the LMV5... and the last actuator exceeds 20 m, a
second transformer is required for powering the actuators.
In that case, transformer 1 supplies power to the basic unit of the LMV5... and the
AZL5...
With the CAN bus cable connections from the LMV5... to the first actuator,
the 2 voltages AC1 and AC2 on the LMV5... side will
not be connected and
only the cables CANH, CANL and M (+shield) will be connected to the first
actuator.
In that case, the actuators are powered by a second transformer which must be located
near the actuators.
The power from that transformer (cables AC1, AC2 and GND) is fed to the actuator
(ACT4 in the example above) and then connected through via bus cable AGG5.640
(Type1) to all the other actuators.
The fuses required for transformer 1 are accommodated in the LMV5... basic unit.
For transformer 2, these 3 fuses must be located close to the transformer.
Example 2
Notes on example 2
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