VMB3PS
Power Supply Module
for VELBUS system
Velbus manual VMB3PS– edition 1 – rev.1.0
1
INDEX
Features ......................................................................................................................................... 3
Connection .................................................................................................................................... 4
Transformer with 2 x 6V secondary voltage ............................................................................ 4
Transformer with 2 x 6V secondary voltage and centre tap .................................................... 4
Transformer with 1 x 12V secondary voltage .......................................................................... 5
Transformer with 2 x 12V secondary voltage .......................................................................... 5
Transformer with 2 x 12V secondary voltage and centre tap .................................................. 6
USE................................................................................................................................................. 7
Use of a common transformer with 2 x 12V secondary voltage on different power modules .. 7
Use of a common transformer with 2 x 12V secondary voltage and centre tap on different
power modules........................................................................................................................ 8
Velbus manual VMB3PS– edition 1 – rev.1.0
2
Features:
◊ Three 12VDC/1A outputs for powering VELBUS modules.
◊ Short-circuit safe
◊ LED indicators for input voltage and the 3 output voltages.
◊ Connectable to transformer with 1 x 12V or 2 x 12V secondary voltages.
◊ Required input tension: 12VAC/3A
◊ Standard DIN-rail housing (2 modules)
◊ Dimensions (L x W x H): 90 x 36 x 58mm.
◊ Weight : 80g
Velbus manual VMB3PS– edition 1 – rev.1.0
3
CONNECTION
The power module is equipped with three 12VDC outputs, each delivering 1A. Connect the 12V voltage outputs of
the power module to the 12V power inputs of the preceding modules (mind the polarity). Note that the total
consumption of the connected modules on one DC output may not exceed 1A. Make sure to use an appropriate
wire gauge (1mm2 or more) with very long connections. Connect a 12V transformer delivering min. 3A to the
power module input. Refer to one of the following connection diagram depending on the transformer:
Transformer with 2 x 6V secondary voltage :
To power loads
N
Circuit breaker
L
6V Sec.
ABCDE F
6V Sec.
Prim.
12V
--
N
AC Power
L
Transformer with 2 x 6V secondary voltage and centre tap:
To power loads
NL
AB CDEF
Circuit breaker
6V Sec.
6V Sec.
VMB3PS
+
12V+12V
-
1A max.
12V/1A max.
12V/1A max.
VMB...
BUS
12V
+
-
+
LH
+
-
+
-
N
AC Power
VMB3PS
Prim.
12V
12V+12V
+
--
L
-+
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
12V
-
+
VMB...
BUS
LH
Velbus manual VMB3PS– edition 1 – rev.1.0
4
Transformer with 1 x 12V secondary voltage:
To power loads
N
Circuit breaker
L
12V Sec.
ABCDEF
Prim.
NL
AC Power
Transformer with 2 x 12V secondary voltage:
To power loads
N
L
12V Sec.Circuit breaker
12V Sec.
12V
-
+
VMB...
BUS
LH
VMB3PS
12V
12V+12V
+
--
+
-
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
ABCDEF
12V
-
+
VMB...
BUS
LH
N
AC Power
VMB3PS
Prim.
12V
12V+12V
+
--
L
+
-
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
Velbus manual VMB3PS– edition 1 – rev.1.0
5
Transformer with 2 x 12Vsecondary voltage and centre tap:
To power loads
NL
ABCDEF
12V Sec.Circuit breaker
12V Sec.
N
AC Power
VMB3PS
Prim.
12V
12V+12V
+
--
L
-+
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
12V
-
+
VMB...
BUS
LH
Velbus manual VMB3PS– edition 1 – rev.1.0
6
USE
Use of a common transformer with 2 x 12V secondary voltage on different power modules:
To power loads
N
L
Circuit breaker
N
AC Power
AB
12V Sec.
L
Prim.
12V Sec.
VMB3PS
12V
12V
-
+
-+-
A BFDCE
VMB3PS
FCDE
12V
+
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
12V
-
+
VMB...
BUS
VMB...
HL
12V
-
+
12V12V
-+-
+
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
12V
-
BUS
+
H
L
Velbus manual VMB3PS– edition 1 – rev.1.0
7
Use of a common transformer with 2 x 12V secondary voltages and centre tap on different power
modules:
To power loads
N
L
Circuit breaker
NL
AC Power
12V Sec.
Prim.
12V Sec.
AB
VMB3PS
12V
12V
-
+
-
A BFDCE
VMB3PS
+
FCDE
12V
+
-
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
12V
-
+
VMB...
BUS
VMB...
HL
12V
-
+
-+
12V12V
-
+
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
12V
-
BUS
+
H
L
Remark:
Do not connect a transformer with 1 x 12V secondary voltage to more than one power module!
When using a common transformer, make sure it can deliver the total current!
Connect the negative output of each power module to one another when using several power modules.
Velbus manual VMB3PS– edition 1 – rev.1.0
8
To power loads
N
L
Circuit breaker
N
AC Power
To power loads
N L
L
12V
12VCircuit breaker
Prim.
Prim.
12V
12V
AB
VMB3PS
12V
12V
-
-
+
A
BFDCE
VMB3PS
12V
12V
-
+
-+-
FCDE
12V
+
-
+
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
12V
+
12V
-
12V
-
VMB...
+
VMB...
+
N
AC Power
To power loads
NL
Circuit breaker
NL
AC Power
L
12V
Prim.
1A max.
ABCDEF
VMB3PS
12V
12V
--
12V
+
-
+
1A max.
+
12V/1A max.
-
+
12V/1A max.
-
VMB...
12V
+
-
+
+
12V/1A max.
+
12V/1A max.
-
Velbus manual VMB3PS– edition 1 – rev.1.0
9
Velbus manual VMB3PS– edition 1 – rev.1.0
10
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