SSS Siedle HT 740-0, Product Manual

Page: 2 / 12

8
English
Montage
Application
The in-house telephone HT 740-0 is
microcomputer-controlled and can
be used in conjunction with the
Siedle- Multi system. Typical fields of
application include:
• Office and business presmises
• Mixed-use buildings
• Large residential complexes
• High-security premises
• Apartment blocks
• Old peoples’ homes
• Nursing homes
• Residential complexes for the han-
dicapped
By using a simple bus installation
with a maximum of 8 cores, it is
possible to eliminate the confusing
number of call lines associated with
multi-systems.
Up to 500 system users, of which
up to 254 may be door loud-spea-
kers, can be directly connected to
this bus line. A system controller
SCO 740-... is required for each
system for archiving the system user
data and for servicing purposes.
System upgrades are possible at any
point of the line network without
problems at any time.
Use of the Siedle Multi system also
makes sense in small systems due to
the comprehensive performance fea-
tures offered and the simplicity of
installation. Different user-oriented
configuration variants are available.
In conjunction with one or more in-
house telephone switchboards, door
loudspeakers with direct call buttons
or code input keypads, control units
and the Siedle video control system,
convenient door access and monito-
ring systems as well as emergency
call systems can be implemented.
System performance features
• Micro-computer controlled decen-
tral system
• A maximum of 500 users subdivi-
ded into a maximum of 15 groups
• A maximum of 2 programmable
global speech channels, or 1 global
speech channel and additionally 1
speech channel for each of the 15
groups
• Connection via plug-in screw ter-
minals for bus connection
4 pairs of cores
• Call button to the switchboard /
call number 1
• Audio privacy function
• Up to 4 units with the same call
number can be switched in parallel
• Can be used in a system contain-
ing system predecessors HT 641-...,
HT 642-... and HT 643-... or
HT 441-... to HT 443-... , i.e. 100%
reverse compatibility in configura-
tion 1 to configuration 3.
• Direct, open duplex communica-
tion
• Facility for combination with an
efficient video system
• System voltage 24 V DC
• Integrated test and servicing func-
tions
Installation
Installation can be performed in any
optional form as parallel cabling, we
recommend side circuit or rising
mains systems with storey-by-storey
distribution.
It is advisable to avoid pure star
or ring-main type systems.
Conductor material
Use twisted-pair, shielded cable
JY(St)Y with 0.8 mm cross-section as
installation material. Cores 1 and 2
must generally be doubled in side
circuits.
Range
With 0.8 mm core diameter, the
maximum range is 800 or 1000 m.
Wiring arrangement
In accordance with the safety regu-
lations for telecommunication
systems VDE 0800, a distance of 10
cm must be maintained from live
conductors. In addition, parallel
wiring over long distances with
high-frequency or interference carry-
ing conductors must be avoided.
The planning and installation guide-
lines for Multi systems must general-
ly be observed.
Mains supply
The system telephone requires a
24 V DC (22-28 V) supply.
The supply voltage at the unit must
nover drop below 22 V when under
load.
Mounting
The units are designed as standard
for wall mounting. A 55 mm junc-
tion box must always be provided
under the system telephone cable
entry as a terminal and storage
space.
Junction box fixture is not
admissible!
Note!
The telephone contains sensitive
electronic circuitry. When the unit is
open, this is freely accessible. The
greatest of care should therefore be
taken during installation. Improper
handling can damage or destroy the
unit.
With the aid of the table-top acces-
sory ZT 711-01/12 for audio and
ZT 711-01/16 in conjunction with
video, the telephone can be moun-
ted as a table-top unit. For flush
mounting, also in combination with
video, flush-mounting accessory
ZUR 611-... and GE/GZ 611-...
are available.
The telephone may only be
mounted and connected when in
an off-circuit status. This work
must be performed by a quali-
fied electrician.
1 Open the system telephone
2 Unit structure
Fastening holes (1)
Light button (2)
Door release button (3)
Address slide switch (4)
Volume potentiometer (5)
Reed contact/hook changeover
switch (6) Control buttons (7)
Fuse (8) System terminals (9)
System terminals (10)
Cable inlet (11)
Socket for video (12)
Socket for receiver (13)
Laying sketch for receiver cord (14)
Plug connector for ZAR 740-... (15)