Siemens LMV51 Series Basic Documentation page 193

Example 2
Control panel
Power supply
max. 3 m
AC1 12 V
12 V
12 V
12 V
230 V
Power trafo 1
AGG5.2...
Notes on example 2
Siemens Building Technologies
HVAC Products
Basic unit LMV5... in the control panel, actuator on the burner;
CAN bus cable «LMV5... ↔ SA» > 20 m
Fixed internal
bus termination
AZL5...
Sub-D
connector
Max. bus cable length
LMV5...-AZL51...: 5 m
AGG5.630 / 631
5
RAST3.5
AC2 12 V
Trafo
M
X52
X51
F3 T4
F2 T4
X10-01
CANL CANH
F1 T6.3
LMV5... basic unit
X3-04
N L
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.
Basic Documentation LMV5...
12 Mounting, electrical installation and service
ACT 1
SQM4...
No bus
termination
3 5
Only
CANH
CANL
GND
3
Max. bus cable length
LMV5...- ACT1: 75 m
AGG5.640 / 641 or
AGG5.630 / 631
X50
7550a04e/0304
Jumper
ACT 2 ACT 3 ACT 4
SQM4... SQM4... SQM4...
Bus
No bus No bus
termination
termination termination
5 5
F T4
Max. bus cable length
ACT4 - ACT1: 20 m
AGG5.640 / 641
230 V
F T2
L
Burner
Max. cable length
of power supply
for actuators 3 m
F T4
Power trafo 2
AGG5.2...
12 V
Not used
N
193/301
CC1P7550en
13.08.2004