32 Installation
Fire alarm and extinguishing system
3.8 Connecting the land-line (PSTN)
The control panel can only be connected via the optional Previdia-C-DIAL board.
Cables: Compliant with local regulations in force
Connect the telephone line [A] to the “L.E.” terminals and telephone device or the internal phone line [B] to the
“L.I.”terminals of the board ([C], paragraph 2.4 - [B]).
3.9 Wiring the external communicators
The Previdia Micro control panels can be used to drive remote alarm or fault signalling devices.
Cables: 2-wire shielded cable
Proper section (minimum 0.5mm², maximum 2.5 mm²)
Compliant with local laws and regulations in force
The “I/O” terminals on-board the control panel [A] and the supervised outputs can be used to create an E-type output
(output for the activation of alarm status signalling on a remote signalling device, as prescribed by standard EN54-2).
To create a J type output (output for activation of fault status signalling on a remote signalling device, as prescribed by
standard EN54-2), only the “I/O” terminals can be used on board the control unit, which can be Programmed as active in
rest condition.
EN54: In both cases, as the external communicator, you must use a remote communication device compliant
with standard EN54-21 [B] and equipped with a supervised activation input [C], a normally closed fault
signal output [D] and a normally-open output for confirming successful communications [E]].
If the external Communicator does not have a supervised activation input, the connection to the control
panel can be carried out by means of a relay, which must be installed inside the communicator casing.
To transmit alarm events via the I/O terminals on board the control panel, you can use normal wiring for
non-polarized devices. To transmit failure events, use the following wiring diagram
:
3K9Ohm
orange, white,
red
B
CE
D
A
470Ohm, 2W
yellow, purple,
brown
A
Relay 24V
470Ohm
yellow, purple,
brown
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