516 / 582
BETA Monitoring
Monitoring of Plants and Devices
7
LQ2 1, 5TT3 3 dusk switches
14/20
Siemens ET B1 · 10/2008
14
■
Overview
Dusk switches are used for the demand-oriented switching of
lighting installations for shop windows or paths in order to cut
operating costs.
A light sensor measures the level of daylight. Switching depends
on the desired brightness. A time delay and the switching
hysteresis prevent clock-pulse behavior.
The sensor must be mounted so that it is not influenced by the
lighting feedback.
■
Benefits
•
The 7LQ2 101 and 7LQ2 103 devices have 2 switching channels
that can be set independently of each other. This requires a
light sensor
• 12
dusk switches can be switched parallel to a light sensor.
This saves the multiple installation of light sensors in a single
system and all dusk switches operate independently of each
other and can be adjusted individually.
■
Technical specifications
7
LQ2 100 7LQ2 101
7
LQ2 102 7LQ2 103
5
TT3 303
Standards
EN 60730
Rated control voltage U
c
V AC 230
Operating range
At 50/60 Hz
× U
c
0.8 ... 1.2
Rated frequency f
n
Hz
45 ... 65
Measuring ranges, setting ranges
Lux
2 ... 500 2
× 2 ... 500 2 ... 500 2 × 2 ... 500 2 ... 2000
Time delay
Non-adjustable
s
75
± 25 No
75
± 25 No
50
Adjustable
No
2
× 50 ... 100
± 25
No
2
× 50 ... 100
± 25
No
Status indication, LED
Switching status indication
Instantaneous
No
Switching state OFF
Green
No
Switching state ON
Red
No
Incandescent lamp load
W 2000
2
× 2000
2000
2
× 2000
1200
Different phases
Actuator/contact permissible
Yes
No
Contact/contact
No
Yes
No
Yes
No
Electrical isolation
Creepage distances and
clearances
Actuator/contact
mm 4
No
Contact/contact
mm No
4
No
4
No
Rated impulse withstand voltage U
imp
Actuator/contact
kV
> 2.5
No
1.2/50
s
Contact/contact
kV
No
> 2.5
No
> 2.5
No
Contacts
contact
1
NO 2 NO
1
NO 2 NO
1
NO
•
Rated operational voltage U
e
V AC 250
•
Rated operational current
I
s
-
At p.f. = 1
A
16
10
-
At p.f. = 0.4
A
4
2
•
Minimum contact load
V; mA 10; 100
•
Contact switching
Closes with approaching
darkness
Terminals 3/4
5/6
and 9/10 3/4
5/6
and 9/10 No
Terminals
•
Terminals
±
screw (Pozidriv)
PZ 1
•
Conductor cross-sections
-
Rigid
mm
2
1.5 ... 6
1.5
-
Flexible, with end sleeve
Min.
mm
2
0.75
0.5
Environmental conditions
•
Permissible ambient temperature
-
Device
°C
-10 ...
+55
-
Light sensor
°C
-30 ...
+70
--
•
Permissible humidity
-
Device
%
< 80
-
Light sensor
%
< 98
--
•
Degree of protection
Acc. to EN 60529
-
Device
IP20, with connected conductors
IP54
-
Light sensor
IP55
IP65
No
•
Safety class
Acc. to EN 61010
II
© Siemens AG 2008