Videx 2 Wire, Manual

Page: 29 / 44

Two Wire Videokit ESVK Series
PrtCode:ESVK_ENG_1.6.doc – Pag.29/44 25/11/2009 Rev.1.6
General Directions for Installation
CABLE TYPES AND CROSS SECTIONAL AREAS
The VX2300 digital system can use several types of cables but depending on their specification will allow different distances up 400 meters maximum.
We do not recommend the use of shielded cables because of the high eddy capacitance. It is also not advised to double up on cables as this will also
increase the capacitance. The following table specifies values of resistance, capacitance and maximum distances achievable for several types of cables
(capacitance and resistance values are referring to 100 metres of cable).
Cable Type Section (mm
2
) Resistance (Ohm) Capacity (nF) *Maximum Distance (meters)
VIDEX CM2 0.75 3.2 8 200m
CAT5 UTP/CW1308 0.22 8 4.9 70m
Std Telephone Cable 0.28 6.5 5.5 100m
**Two wire 0.8 / 1 2 6.5 70m
* Between the power supply and the furthest door station or between the power supply and the furthest videophone.
** In case of projects where it is necessary to reuse existing cables that could be cabled together with mains or other power cables, check in advance
the practicability of the system: if the system cables are cabled together with mains or other power cables, the system is directly exposed to electro-
magnetic interference that may cause noises on audio/video and lost of functionality over digital communications.
In case of use of cables not in conformity with above specification it is possible to experience deterioration of digital and video signals. We suggest to
use twisted cables with maximum resistance of 10 Ohm/100m for each wire (between the farthest door station and the farthest videophone) and maxi-
mum capacitance of 40nF (this value must be computed considering all the cables used in the system; the capacitance/metres value is normally speci-
fied on the cable package or directly on the cable).
BUS DEVICES SETUP AND VIDEO DISTRIBUTION
−
Any device on the system (door station, intercom, videophone, relay etc.) for which the programming is carried out through one or more dip-switches,
to store the new setup, must be disconnected from the power supply for 1 minute at least.
−
When you have more than one device in the same apartment, all the devices must be connected to the same video distributor (Art.317): this means
that you cannot use two video distributors Art.318 for one apartment where you have 4 videophones/intercoms.
HOW TO CONNECT LOCAL POWER SUPPLY
The drawing below shows how to connect a local power supply when required (i.e. when you have 4 videophones with the same address that must be
switched on at the same time). In both cases switch 4 of SW3 must be set to the ON position.
NOTE ! OBSERVE CONNECTION POLARITIES AS SHOWN IN THE DIAGRAM BELOW.