ABB i-bus KNX Product Manual - page 20
ABB i-bus
KNX
Device technology
18 2CDC 507 100 D0202 | DLR/S 8.16.1M
2.2
Light Sensor LF/U 2.1
LF/U 2.1
The ABB i-bus
®
KNX Light Sensor LF/U 2.1 is a brightness sensor for closed rooms.
The Light Sensor is installed in a standard installation box in the ceiling. The cover (white)
of the sensor is stuck firmly onto the device. The complete unit is then screwed into a
flush-type box.
Up to eight Light Sensors LF/U 2.1 can be connected to a DALI Light Sensor
DLR/S 8.16.1M. The Light Sensor measures brightness values in closed rooms. When
combined with the detected values, the DLR/S is used for constant light control. It is
possible to combine the brightness values from several Light Sensors for the calculation of
an individual control circuit. It is thus possible to implement light control in rooms with
difficult lighting conditions.
The electrical connection of the LF/U to the DLR/S is undertaken with a twin core MSR
cable (SELV), e.g. KNX bus cable. The total length of this cable may not exceed 100 m.
The LF/U is supplied with a Plexiglas rod, which snaps into the sensor housing.
The registration area can be limited with the Plexiglas rod with the white coating.
2.2.1
Technical data LF/U 2.1
Supply
SELV
Implemented via DLR/S 8.16.1M
Connections
On the DLR/S 8.16.1M
1 connecting terminal white/yellow
(connecting terminals are supplied with the
device)
Max. cable length per sensor
Per sensor 100 m, Ø 0.8 mm,
P-YCYM or J-Y(ST)Y cable (SELV), e.g.
shielded KNX bus cable
Brightness detection
Lighting control operating range
Optimized for 500 Lux.
200
…1,200 Lux for rooms with average
furnishing level, degree of reflection 0.5
Max. 860 Lux in a very brightly furnished room
(reflection 0.7)
Max. 3,000 Lux in a very darkly furnished room
(reflection 0.2)
The Lux values are measured values on the
work surface (reference surface)
1)
.
Optimum installation height
2…3 m
Degree of protection
IP 20
To EN 60 529
Protection class
II
To EN 61 140
Isolation category
Overvoltage category
Pollution degree
III to EN 60 664-1
2 to EN 60 664-1
2
CD
C 0
7
1
0
1
8
F
0
0
0
8