26
(MT12 - Gb2004)
INSTALLATION INSTRUCTIONS
General characteristics
- The cable runs of intercom and video intercom installations must be
kept separate from the mains or any other electrical installation as
required by the International Safety Standards and the entire
installation must be realized in compliance with the safety rules in force
in any specific Country.
- It is necessary to provide a disconnecting and safety switch before the
power supply. Use a single general switch in case of several power
supplies (also in multiple entrance).
- Before connecting the power supply make sure that its rating data
corresponds to this of the mains.
- For electromagnetic reasons, all service modules must be installed
near their power supply.
Wires
1) For the correct operation of the intercom system you must choose the
correct type of cable.
2) Wires must be dimensioned according to the distance of the different
devices and their current consumption.
3) Do not connect wires in parallel to reach the required cross-section
(for example multi-pair telephone cables). Only use a single wire with
suitable cross-section. When using multi-core cables you must select
them with low parasite parameters (low capacitance per metre, low
inductance over Ohm).
4) If the installation includes additional power supplies you must place
them near the device to be powered.
Background noise
To avoid possible background noise over the speech line, it is advis-
able:
5) not to lay intercom or telephone cables in the same runaway as the
wires used to power alternate current loads;
6) to avoid using the same multi-core cable to transmit audio signals
and alternate current power supplies (lamps, amplified external door
stations, electrical door locks). Always use separate wires for alter-
nate current power supplies;
7) not to connect name-plate lamps (or other devices powered with
alternate current) to terminal 4 (-) of the speaker unit; 2 wires must
originate from terminal - (minus sign) of the power supply, one for
terminal 4 of the speaker unit and one for the lamps (or other devices
powered with alternate current);
8) for name-plate lamps, to use an additional 12Vac transformer
(PRS210 type) with suitable power (consumption is 75mA for each
lamp) with 2 power supply wires separate from audio wires;
9) in case of long distances between the external door station and the
last intercom, to place the power supply near the external door station
and use a relay for the electric door lock in order to avoid alternate
current induction along the riser (see diagrams of lateral column).
to terminal 5 of
the intercom
use the PRS231 or
PRS240 power supply
instead of PRS220
additional
relay
to terminal 5 of
the intercom
power supply in the
installation
additional
relay
Connection of 2 door locks with simultaneous opening
(Si12MO/1).
to terminal 3 of
the intercom
additional
transformer
Connection of 2 door locks, one of which always activable, in
a system with multiple entrance (Si16MO/1; Si 16MO/2).
to terminal 5 of
the intercom
power supply in the installation
additional
relay
to terminal 3 of
the intercom
to the other stairs
power supply in the instal-
lation
analog
exchanger
of the stair
additional
relay
additional
relay
ELECTRIC DOOR LOCK ACTIVATION
In case of long distances or if you want to control several door locks at
the same time, install a relay as shown in the following installation
diagrams.
Electric door lock activation by means of an additional relay
PA = door release button
SE = electric door lock
diode
(100V-1A)
I
NTERCOMS
*
V
IDEOINTERCOMS
*
T
ELECOMMUNICA
TION
m.
50
100
200
300
400
mm²
S
0.35
0.35
0.5
0.75
1
AWG
21
21
20
18
16
Audio and calls
Distance
WIRE CROSS-SECTION
(*) Wires in bold face type.
Door lock and ground
(*)
m m
Ø
0.7
0.7
0.8
1
1.2
mm²
S
0.75
1
2
2.5
-
AWG
18
16
14
13
-
m m
Ø
1
1.2
1.4
1.6
-
