FARFISA INTERCOMS ECHOS, Техническое руководство

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146
(MT11 - Gb2012)
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 differ-
ent 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.
4+1
INTERCOMS
*
7+1
VIDEOINTERCOMS
INSTALLATION INSTRUCTIONS
WIRE CROSS-SECTION
For the video signal use a TV 75
Ω
low loss coaxial cable or a twisted pair (see next pages).
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 diagram on page 152).
Videointercom system
Distance Audio and calls
Intercom system
Door lock and ground
(wires in bold face type)
m.
50
100
200
300
mm²
S
0,5
0,75
1
1,5
mm
Ø
0,8
1
1,2
1,4
Terminals
Distance
mm²
S
0,75
1
1,5
2,5
mm
Ø
1
1,2
1,4
1,8
1 . 2 . 1D . 2D . 3D . 4 . 5
3+ . 7 . A . C+ . 9M (calls) F . H . S .
(wires in bold face type)
AWG
20
18
16
15
AWG
18
16
14
13
feet
165
330
660
990
m.
50
100
200
300
400
mm²
S
0,35
0,35
0,5
0,75
1
mm
Ø
0,6
0,6
0,8
1
1,2
mm²
S
0,75
1
2
2,5
-
mm
Ø
1
1,2
1,4
1,8
-
AWG
22
22
20
18
16
AWG
18
16
14
13
-
feet
165
330
660
990
1300