Light Sensor 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
Safety class
Isolation category
18 2CDC507128D0202 | DLR/A 4.8.1.1
®
The ABB i-bus KNX Light Sensor LF/U 2.1 is a brightness sensor for closed rooms. The
light sensor is mounted 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 4 Light Sensors LF/U 2.1 can be connected to a DALI Light Controller DLR/A
4.8.1.1. The light sensor measures brightness values in closed rooms. When combined
with the detected values, the DLR/A is used for constant lighting 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 control of the lighting in rooms
with difficult lighting conditions.
The electrical connection of the LF/U to the DLR/A 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/A 4.8.1.1
Max. cable length per sensor
Lighting control operating range
Optimum installation height
IP 20
II
Overvoltage category
Pollution degree
Atmospheric pressure
Implemented via DLR/A 4.8.1.1
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..1200 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. 3000 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
Atmosphere up to 2,000 m
1)
.