urmet domus 826 DIGITAL CALL SYSTEM, Руководство пользователя

Страница: 19 / 118

826
LINE CAPACITANCE LIMITS
For purpose of line capacitance, maximum system extension must not
exceed the following limits:
•
Single riser cable systems: 1200 m
•
Complex systems: 1500 m
For single riser cable systems, maximum system extension is defi ned
as the distance between the calling device and the decoder unit
located farthest from it.
For complex systems, maximum system extension is the total length
of all line runs, excluding the branch lines from the decoder units to the
apartment stations.
Example:
GENERAL REQUIREMENTS
The following rules must also be observed:
1) Do not connect several conductors in parallel in order to reach
the required cross-section (e.g., multi-core telephone cable). A
single, and preferably stranded-core, conductor of appropriate
cross-section must be used.
2) In complex installations, do not leave open cable runs (i.e., with no
decoders connected to the system backbone cable): each cable
run must be connected to at least one powered device.
If this is necessary to accommodate future expansion or for maintenance
purposes, disconnect the open run from the backbone cable.
3) Never exceed the maximum limit of 400 devices (where the term
device means any item connected to the data line).
4) NEVER connect power supply units in parallel.
5) Position power supply units in the vicinity of calling devices as
indicated on the installation diagrams.
6) Never exceed the maximum number of devices that can be
connected to a single power supply unit
7) ALL apartment station equipment in a system must be of the same
type (i.e., either all electronic call tone signaling or all conventional
buzzer type).
Mixed confi gurations cannot be used.
8) Do not connect more than one apartment station for each decoder
(with four-port decoders 826/23, a maximum of four apartment stations
can be connected, i.e., one - and only one - for each branch).
If several doorphones or video doorphones must be connected in
parallel to the same branch, see the applicable URMET DOMUS
installation diagrams.
9) All codes used in a system must be unique. Never assign two
identical codes in order to make two apartment stations ring at the
same time.
SYSTEM MAINTENANCE
Another import aspect to be considered when designing a system
(and one which is often underestimated) is that of maintenance. Thus,
future maintenance needs should be borne in mind at the outset in
order to facilitate work should a problem arise.
The following measures are recommended:
1) Where possible, use different colored conductors for each signal,
as indicated in the examples below.
Riser cables:
BLUE = 1
GREEN = 2
BLACK = -24
WHITE = D
RED = + 24
Branch lines:
LIGHT BLUE (BLUE) = 1
LIGHT GREEN (GREEN) = 2
BLACK = 6
ORANGE (RED) = 7/CA
PURPLE (WHITE) = 9
BROWN = C
If all of the colors suggested for branch lines are not available, use the
same colors as in the riser cable (indicated in brackets), separating
the conductors with tie wraps and marking them appropriately.
2) If wires cannot be identifi ed by using different colors, mark them
with tie wraps or other suitable means.
3) Always write down the codes programmed in the decoders on the
labels provided for this purpose on the entrance module.
4) Where doorphones or other devices with single-port decoders
are used (826/14, 1204/94), disconnectable junctions should be
installed outside of the apartment so that work can be carried out
on the riser cable even if the occupant is not at home. This applies
to all devices which must be located on private premises.
5) In systems with several riser cables whose wiring is grouped
together at the same point, mark each conductor with the codes for
the riser cable of which it is a part (e.g., “conductor D, riser cable
1”, “conductor D, riser cable 2”, and so forth).
TYPES OF INSTALLATION
The URMET DOMUS Model 826 Digital Call System can be used in
the following types of installation:
•
Digital doorphone systems.
•
Digital doorphone systems combined with video doorphone
installations.
•
Installations with a digital guard door switchboard station serving a
doorphone and/or video doorphone system.
To facilitate installation work, always base the system to be set up on one
of the four basic confi gurations described in the following paragraphs.
Regardless of the theoretical considerations expressed below, it should
be borne in mind that there is a physical limit to the maximum number
of devices that can be simultaneously connected in any system.
Model 826 DIGITAL CALL SYSTEM
TYPES OF INSTALLATION
a + b + c + d + e + f + g =
≤
1500 m
NO YES
Disconnect
M
o
d
el
826
D
IG
ITAL CALL S
Y
STEM
1
- 11
MT124-019