Specifications

T4
T4.19
Staircase swithces
Also in this case, the function of the staircase time
switch or the circuit that it operates can be
indicated behind the circuit indicator
2 .
All electronic staircase switches can be used in a 3-
or 4-wire configuration (see below) without any
special wiring or hardware-setting. For the
electromechanical version however, the selection
between a 3- or 4-wire wiring is accomplished by
means of a switch on the side of the device as is
shown in figure 7.
3- and 4-wire wiring
Depending on the wiring execution in the field i.e.
the way in which the wire-conducts are physically
interconnecting the push-buttons, lamps and
staircase switch, the cabling can be carried out in
two different ways.
If there is only one tube or cable daisy-chaining all
push-buttons and all lamps, then, as is shown in
figure 8, a 3-wire wiring would be the most
economic way of doing. For simplicity reasons the
PE-conductor is not shown here.
However, in some cases one wiring-tube or cable is
interconnecting all lamps with the staircase light
switch and another tube or cable is interconnecting
all push-buttons as shown in figure 9. Obviously in
this case we cannot use one common wire for the
push-buttons and for the lamps as in the above
wiring diagram. For this setup, 4-wire wiring as
shown in figure 9 is required. Also in this case the
PE-conductor is not shown.
Wiring the dim add-on module
The dim add-on module is a universal usable add-
on that can be used in combination with all types of
staircase switches.
Operation (see fig.10 and fig.11)
When the staircase switch is energised through one
of the push-buttons, its output contact energises
the load and the dim add-on module. Therefore, the
output contact of the dim-module is in its ‘on’ state.
As soon as the time of the staircase switch has
elapsed, its output contact opens. As the dim-
module acts as a delay ‘off’ timer, its output contact
remains closed. The level of the voltage supplied
to the coil of the dim-module through its own
contact however is not high enough to keep the coil
energised. Indeed, because of the internal diode in
series with the output contact, half of the supply
voltage is cut away. This results in an RMS value of
the voltage supplied to the coil of the dim-module
and to the load being only half of the nominal
supply voltage.
fig.8
fig.7
fig.9
fig.10
3-4 wire
selection switch
dim add-on module