Specifications

T4
Multilevel/multichannel light sensitive operation
with 1 photocell
Based on the external light intensity, the light
intensity of a (large) room can be adjusted in order
to keep the overall light intensity in the room
unchanged (see fig.4 and table 1).
Remark
When using only 1 photocell with several (max 10)
2-channel light sensitive switches, only on 1 light
sensitive switch terminal 10 needs to be connected
to terminal 12 while on all others, terminal 10 is to
be left open (see also fig.4 and table 1).
Features and benefits
DIN-rail mountable devices
Photo 1 shows the front views of the 1- and
2-channel and 1-channel with integrated
digital timer together with the photocell.
An LED
1 indicates the status of each output
contact (LED on: output relay energised, LED off:
output relay de-energised).
By means of a potentiometer
2 , the user can
select in a continuous way the light intensity that he
wants the twilight switch to switch. This threshold
can be set between 2 and 500 lux. The hysteresis
between the switch-on and switch-off threshold is
fixed at 30% of the switch-on level. This means that
the switch-off light intensity is at 130% of the
switch-on light intensity.
In order to reduce instability and also to avoid
nuisance switching, the user can also preset an on-
and off-no-response delay, also by means of a
potentiometer
3 .
As always, the function of the twilight switch or the
circuit that is operated by it can be indicated
behind the circuit indicator
4 i.e. garden lights,
blinds, etc.
The clearly marked Pozidriv safety terminals
5 are all captive. Both the 2-channel as well as the
1-channel twilight switch with integrated digital
timer can be sealed
6
.
From the programming point of view, the 1-channel
twilight switch with integrated digital timer has
exactly the same features and possibilities as the
GLX Q 21 W 20 digital timer (see page T4.26),
except for the number of programming steps
which is 30 instead of 20. Figure 6 shows the
correct mounting of the photocell. The photocell
has an IP65 degree of protection.
Wall mountable device
This all-in-one device is shown in photo 2.
This complete device, including photocell, amplifier
and output contact, has an IP54 degree of protection.
T4.30
GE Power Controls
Comfort Functions
fig.4
photo 1
fig.6
photo 2
Lux
> 700
< 600
< 500
< 400
< 300
Window
row
Group 2
off
on
on
on
Group 4
off
off
off
on
1
2
5
1
2
3
6
4
5
all lights on at all time
Group 1
on
on
on
on
Table 1
Inner
rows
Group 3
off
off
on
on