ABB Welcome, User Manual

Page: 32 / 58

The conversion of old bell and intercom systems to ABB-
Welcome ("1+n" technique, with coaxial cable for video if
necessary) The multifamily house has available:
» At the door: bells (with "1+n" wiring) + loudspeakers /
microphones
» Indoors: in each apartment, one indoor station with gong
and a button for opening the front door
» In the sub-distribution: one bell transformer for the buzzer/
electronic door opener, one transformer for the house
telephones
For systems with "1+n" wiring as rising mains installation with
branch connections to the indoor stations only two wires are
required from the multi-wire cable. The indoor stations of the
ABB-Welcome system are also connected to the rising mains
via the branch line. For a video system one indoor FM video
distributor should be installed in the branch box.
The layout of a system in "1+n" wiring as star-shaped
installation – which comes from the main distribution, for
example – can easily be used in an ABB-Welcome system.
Here all cables to the indoor stations are connected to
the system controller. For a video system, indoor MDRC
video distributors must additionally be installed. For an
existing "1+n" system without system controller a two-wire
cable must be laid from the outdoor station to the system
controller. Usually an existing cable can be used here.
Installation instructions for modernization
The modernization of a building is an ideal opportunity for
replacing an existing intercom with a modern ABB-Welcome
system within the design of the other electrical installations.
Here, as a rule – independent of the type of wiring of the old
system (pure bell system, intercom in "1+n“ technology or
comparable systems, 2-wire bus technique) – existing lines can
be used. In case of existing cable material a possible reduction
of the transmission range is to be checked.
It is recommended not to install the bus lines and power
supply for the electric door opener in the same cable, since
this may impair the quality of the picture in video systems.
We additionally recommend the use of high-impedance door
openers.
Conversion of old bell systems in one-family houses to
ABB-Welcome
Available:
» At the door: one bell
» Indoors: one gong
» In the sub-distribution: one transformer for the gong and
the name plate
The conversion of the bell system in a one-family house to an
ABB-Welcome system is easy if a cable is available from the
front door to the distribution and a cable from the distribution
into the building, e.g. in the hallway. This layout is used by the
system controller, outdoor station and indoor station.
This enables buildings with only a bell system to be retrofitted
with audio or video systems.
32 Installation |
User Manual ABB-
Wel
come