Siemens LMV51 Series Basic Documentation page 138

Example 2
Control panel
Max. bus cable length
LMV - AZL: 5 m
AGG5.630 / 631
Power supply
line max. 3 m
AC2 12 V
M
AC1 12 V
12 V
12 V
12 V
230 V
Power trafo 1
AGG5.2xx
Notes on example 2
138/157
Siemens Building Technologies
HVAC Products
Basic unit LMV51... in the control panel, actuator on the burner;
bus cable «LMV « SA» > 20 m
Fixed internal
bus termination
AZL
Sub-D
connector
5 3
Rast 3.5
Trafo
X52
X51
F3 T4
F2 T4
X10-01
F1 T6.3 CANL CANH
LMV51... basic unit
X3-04
N L
Total length of bus cable £ 100 m
Whenever the distance between the LMV51... 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 LMV51... and the
AZL51...
With the bus cable connections from the LMV51... to the first actuator, the 2 voltages
AC1 and AC2 on the LMV51... 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 LMV51... basic unit.
For transformer 2, these 3 fuses must be located close to the transformer.
Basic Documentation LMV51...
9 Mounting, electrical installation and service
ACT 1 ACT 2
SQM 4x SQM 4x
No bus No bus
termination termination
X1 X2 X1
3 5
Only
CANH
CANL
GND
Max. bus cable length
LMV - ACT1: 75 m
AGG5.640 / 641 or
AGG5.630 / 631
X50
7550a04E/0202
ACT 3 ACT 4
Jumper
SQM 4x SQM 4x
Bus
No bus
termination
termination
X2
X2 X1 X2 X1
5 5
F T4 F T4
Max. bus cable length
ACT4 - ACT1: 20 m
AGG5.640 / 641
230 V 12 V
Not used
F T2
L N
Burner
Max. cable length
of power supply
for actuators 3 m
Power trafo 2
AGG5.2xx
CC1P7550en
29.05.2002