Light Sensor Lf/U 2.1; Technical Data Lf/U 2.1 - ABB i-bus KNX Product Manual

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ABB i-bus KNX
Device technology
2.2

Light Sensor LF/U 2.1

LF/U 2.1
2.2.1

Technical data LF/U 2.1

Supply
Connections
Brightness detection
Degree of protection
Protection class
Isolation category
18 2CDC 507 100 D0202 | DLR/S 8.16.1M
®
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.
SELV
On the DLR/S 8.16.1M
Max. cable length per sensor
Lighting control operating range
Optimum installation height
IP 20
II
Overvoltage category
Pollution degree
Implemented via DLR/S 8.16.1M
1 connecting terminal white/yellow
(connecting terminals are supplied with the
device)
Per sensor 100 m, Ø 0.8 mm,
P-YCYM or J-Y(ST)Y cable (SELV), e.g.
shielded KNX bus cable
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)
2...3 m
To EN 60 529
To EN 61 140
III to EN 60 664-1
2 to EN 60 664-1
1)
.