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Light Sensitive Switches
Light Sensitive Switches
Using light sensitive switches can prevent the unnecessary use of
lighting circuits where sufficient daylight exists. The benefit of
modular devices is the facility to set the ambient lighting level at
which the device will operate, and as the device is fitted at the
distribution point prevent unauthorised tampering. The remote pho-
tocell unit can be mounted up to a distance of 50 metres from the
device. Two devices are available the standard EEN100 light sensitive
switch and an enhanced programmable version the EE171 that also
allows time clock control.
Principle of Operation
Both devices control lighting systems according to natural
illumination;
• The user sets the working level:
• The photo cell measures the external light level
The output of the EEN100 is:
• ON, when the measured level is lower than the pre-set
light level
• OFF, when the measured level is higher than the pre-set
light level
The output of the EE171 during the programmed ON time period is:
• ON, when the measured level is lower than the pre-set
light level
• OFF, when the measured level is higher than the pre-set
light level
The output of the EE171 during the programmed off time period is:
• OFF, regardless of the lighting level
The light sensitive switches include a built in time delay which avoids
unnecessary switching due to temporary factors such as car
headlight beams etc...
Description
The programmable light sensitive switch EE171 has two main
functions:
• Light sensitive switch comprising
1 Override selector switch to allow permanent ON or OFF, auto or
test mode
2 Lighting range selector
3 Potentiometer to set light level
4 Indicator to show output switching status
• A programmer to establish the automatic operating cycle
The programmer comprises 4 keys:
5
ON / OFF
to choose whether the circuit is on or off.
6
Prog
to set the program and scroll program steps
7
Reset
8
+
and
-
to change settings
Lux
T
6:00 8:00
17:00
23:00
ON
ON
OFF
OFF
OFF
11
10
12
N
5
1
2
L
6
6E0585a
230V 50Hz
μ
16A 250V
10
11
12
AC1
test
auto
2000
50
Lux
100
5
12
7 8 9 10 11
6
1 2 3 4 5
on/off Prog
+
3
4
2
1
3
4
2
1
6
5
7
8
L
N
10 11 12
5 6
1 2
Modular
Devices