Installation manual
Installation
65
4.11
IFAMFFT internal module wiring
Each IFAMFFT module manages up to 4 socket risers for the connection of emergency telephones. A socket riser
consists of a twisted bipolar cable (telephone twisted pair cable) to which all the emergency telephone sockets are
connected in parallel and terminated with a 2.2 KOhm resistor.
When an emergency telephone is plugged into one of the riser sockets, an emergency call will be signalled on the
control panel. Accepting the call will establish a telephone connection between the central console and the remote
telephone plugged into the riser socket.
More emergency telephones inserted in the same riser socket will automatically go into group chat mode (maximum 4).
From the control panel it is possible to accept calls from different riser sockets (up to a maximum of 4) for a call in chat
mode.
Cables:
Line connection via twisted pair cable with a maximum
length of 500m.
4.12
IFM2L internal module wiring - loop connection
The connection circuits of the peripheral detection/activation devices are defined as “loops”. These loops start from the
output terminals, run through the entire protected area connecting in parallel all the system devices before re-entering
on the input terminals.
The loop utilizes the same two wires for the power supply to devices and for two-way communication. Due to electrical
incompatibility, different brand devices (i.e. devices using different protocols) cannot co-exist on the same loop.
However, the loops can be programmed separately in such a way as to allow the system to manage different brand
devices on different loops.
Loops are made by means of a two-wire shielded cable with proper wire section (refer to the following cable
specifications) and in compliance with local laws in force.
The wiring must be completed in a loop in order to guarantee the tolerance of wire-cutting or short-circuit on the cable.
Cables:
2 wire shielded cable
Twisted 5/10cm
Total maximum capacity 0.5uF
Maximum length 2000m
Maximum resistance (considering the sum of the positive
and negative conductor) 40Ohm
It is necessary to consult the configuration software,
Previdia/STUDIO, for the proper cable sizing in relation to
the power consumption of the connected devices, or to
the following table for a rough estimate:
The cable shield must be connected to the Earth bar at one end only.
For the connections of the various devices refer to the instructions supplied with the devices themselves.
The following diagram illustrates the proper completion of the loop wiring. Starting from Loop-A/B OUT terminals on the
IFM2L module (
[A], paragraph 3.13 - [C] - [D]
) proceed with the connection of the peripheral devices located in the area
protected by the system (
[B]
) and re-enter on Loop-A/B IN terminals (
[C]
).
OUTPUT
RETURN
INPUT OUTPUT
INPUT OUTPUT
INPUT OUTPUT
2K2Ohm
red, red, red
Socket 1
Socket n
Socket 2
Total loop
length
Wire
section
American
Wire
Gauge
Up to 1000m
2 x 1 mm²
17 AWG
Up to 1500m
2 x 1.5 mm²
16 AWG
Up to 2000m
2 x 2 mm²
14 AWG
