User manual FARFISA FEVS

[. . . ] 35mm² wires (Ø=0 , 6mm; AWG22) instead of the coaxial cable. 1) For the correct operation of the intercom and videointercom 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. [. . . ] When using multi-core cables you must select them with low parasite parameters (low capacitance per meter, 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 advisable: 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 alternate current power supplies; 7) 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; 8) in case of long distances between the external door station and the last intercom, to place the power supply near by the external door station. For the connection of the video signal you can choose from: - connection with junction box - serial connection (input and output) - connection with floor distributors CONNECTION WITH JUNCTION BOX All wires are distributed in the floor junction box. Due to the signal loss introduced by each connection, the maximum number of video intercoms that can be connected in serial mode is 20. Two 75 resistances must be inserted between X and F and between Y and F in the last video intercom. The maximum distance between the video intercoms and the connector block is 2. SERIAL CONNECTION Connections are made on the video intercom brackets, and not in the junction box. Connection of the video signal on a single riser Terminals X and Y of the last distributor must be terminated with the 75 resistances supplied with the article. Connection of the video signal with distribution on several risers In video systems with different risers you must use 1 or more video distributors art. Terminals X and Y of the last distributor must be terminated with the 75 resistances supplied with the article. PA = Door release push-button (optional) SE =Electric door lock (12VAC-1A max. Read the note on the bottom of this page Application of 1 videointercom and 3 parallel intercoms Read the note on the bottom of this page Application of 1 videointercom and 2 parallel intercoms To do this, insert the 2 application examples in this page instead of the monitor which has been represented in the various installation diagrams of pages 249, 250, 251, 252 and 253. PA = Door release push-button (optional) SE =Electric door lock (12VAC-1A max. Control switching ON deactivation To activate the control switching ON from the videointercoms only when the system is in standby, it is necessary to install a relay (type 1471 or 1472) and connect it as shown on the diagram. PA = Door release push-button (optional) SE =Electric door lock (12VAC-1A max. Control switching ON deactivation To activate the control switching ON from the videointercoms only when the system is in standby, it is necessary to install a relay (type 1471 or 1472) and connect it as shown on the diagram. [. . . ] Control switching ON deactivation To activate the control switching ON from the videointercoms only when the system is in standby, it is necessary to install a relay (type 1471 or 1472) and connect it as shown on the diagram. PA = Door release push-button (optional) SE =Electric door lock (12VAC-1A max. PA = Door release push-button (optional) SE =Electric door lock (12VAC-1A max. [. . . ]