Siemens Albatros2 Technical Manual page 12

2 Engineering use
Room units Q AA74
Orientation
Protection against
foreign objects and water
protection
Power supply
Bill of quantity for wiring
variants
Extern al supply
12
Siemens
Building Technologies
It is normally installed vertically (90°), e.g. on a wall surface. The mounting surface
may be inclined however.
Device
QAA74
The following table shows possible power supplies.
Power supply
Via bus (2-wire)
Via controller (3-wire)
Via external power supply
Application
Renovation
New building, simple
New building, extended
BSB (CL+)
2x QAA55
GND (CL-)
1x QAA74
1x AVS74
N1
Extern al supply
DC +12 V SELV
Graphical User Interface UI400
Protection as per EN 60529
IP40
Mounted
l
Explanation
Bus power BSB
At connection G+ on the
controller
Observe section "External
power supply"
Wiring
2-wire
3-wire, to controller
3-wire with external power
supply
BSB (CL+)
GND (CL+)
DC 12 V (G+)
1x QAA74
1x AVS74
N1
Notes
Power consumption: 36 mA per device
l
Power limitation: 1 A
l
Note
Not backlit
Backlit
Backlit
Bill of quantity (maximum)
1x AVS74, 1x QAA74, 2x
QAA55
1x AVS74, 1x QAA74
1x AVS74, 3x QAA74
BSB (CL+)
GND (CL-)
~
DC 12 V AC 230 V
3x QAA74
1x AVS74
N1
CE1U2348en
2014-06-03