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

®
ABB i-bus KNX
2.2

Light Sensor LF/U 2.1

LF/U 2.1
2.2.1

Technical data

Supply
Connections
Brightness detection
Enclosure
Safety class
Isolation category
© 2008 ABB STOTZ-KONTAKT GmbH
Device technology
®
The ABB i-bus 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.
On the Light Controller LR/S x.16.1 (x = 2 or 4) up to two or four Light
Sensors LF/U 2.1 can be connected. The light sensor measures brightness
values in closed rooms. When combined with the detected values, the Light
Controller 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 achieve control of the lighting
in rooms with difficult lighting conditions.
The electrical connection to the Light Sensor on the Light Controller is
carried out with a twin core MSR cable (SELV), e.g. KNX bus cable.
The total length of this cable may not exceed 100 m.
The Light Sensor is supplied with a Plexiglas rod which snaps into the
sensor housing. The registration area can be limited using the Plexiglas rod
with the white coating.
The Light Controller and the connected Light Sensor are supplied with power
via the KNX and do not require any additional auxiliary power supply.
SELV
1)
to LR/S x.16.1
Max. cable length per sensor
Lighting control operating range
Optimum installation height
IP 20
II
Overvoltage category
Pollution degree
via LR/S x.16.1 (x = 2 or 4)
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
Optimised 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 DIN EN 60 529
to DIN EN 61 140
III to DIN EN 60 664-1
2 to DIN EN 60 664-1
2)
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