Video System: Connection Of Devices On The External Bus; Utilization Of The Two Internal Bus Lines; Connection Of Floor Call Buttons - ABB Welcome User Manual

Video system: Connection of devices on the external bus

Fig. 13 Fig. 14 Fig. 15
The following devices, aside from the system controller and
the previously listed devices, are usually connected to the
external bus of an video system:
» ABB-Welcome video outdoor station
» ABB-Welcome video outdoor distributor
For a video system only, branch connections with one
outdoor video distributor each are permitted for wiring several
ABB-Welcome video outdoor stations. Additional devices –
such as the corridor/light switch actuators or ABB-Welcome
audio outdoor station – can be connected via looping. For
systems with up to four ABB-Welcome video outdoor stations
we recommend the topologies shown.
It is irrelevant whether the external bus is terminated from an
audio outdoor station or a switch actuator.

Utilization of the two internal bus lines

Two internal bus lines can be connected to the system
controller via the two terminal pairs. Depending on the layout
of the building, the following divisions are recommended:
» All devices are connected to an internal bus line. The second
internal bus line remains unoccupied for later applications.
» The devices are distributed uniformly on the two internal
bus lines. This allows two rising mains to be implemented,
for example.
For the second version one internal bus line can be used for
audio only. This is wired according to the rules for audio
systems. No video distributors are required on the branch
connections and the terminal resistors are to be set on
"OFF". The other internal bus line – for video and, if
necessary, for audio – is to be wired according to the
rules for video.
22 Planning ABB-Welcome systems | User Manual ABB-Welcome
The following applies to the system limits:
» When calculating the consumer units, all devices without
a power supply that are connected to the internal bus line
must be taken into consideration.
» For a pure audio internal bus line the signal range is 300 m.
» For a video internal bus line the signal range is 100 m.
» For each internal bus line the upper limits for the device
apply which are listed in the Table on page 18, Chapter 02.
Notes:
» The twisted pairs of both internal bus lines must not be
installed in the same cable.
» The two internal bus lines must not be connected together.

Connection of floor call buttons

In multifamily houses the floor call buttons for ringing at the
apartment door are mostly installed in the stairwell or cor-
ridor.
In an ABB-Welcome system a floor call button for connecting
Fig. 16
to an indoor station is provided for each apartment. If available,
two wires of the cable can be used, which also includes the
2-wire bus. The maximum distance from the indoor station
to the floor call button can be 50 metres. When the button
is pressed all indoor stations will ring. At the indoor station a
separate bell sound can be selected for the floor call and the
call from the outdoor station.