6
Overview
Installation and programming manual
[A] Loop
All the peripheral devices of the system must be connected in parallel to the loop circuit (2 pole STP). The
loop is a closed electrical circuit in which a wide variety of alarm devices can be accommodated. Opening or
closing the circuit at any point will generate a fault signal. The loop circuit communication path starts on
the Loop-Out terminals and ends on the Loop-In terminals. The panel controls and communicates with the
loop devices via digital protocol. The loop utilizes the same two poles for the power supply to the system
devices and the two-way communication channel. The loop accommodates:
1.
Detectors:
A smoke detector is an active fire protection device that detects smoke or flames and issues an alarm
thereby alerting building occupants to the danger of fire. Detectors can be:
- Optical smoke detectors which look for the presence of visible by-products of combustion in the detection chamber
(Tyndall effect).
- Optical/Heat detectors which operate as per optical smoke detectors but also sense for increase in the environment
temperature. The combination of both sensing methods (smoke and heat) provides faster detection and reduces
the false alarm rate.
- Heat detectors: sense for an increase in the temperature in the protected environment. There are two types of
heat detector: Fixed temperature — that signal alarm when the temperature exceeds the predefined threshold;
and Rate-of-rise — that as well as monitoring the predefined fixed temperature also respond to rapid increase in
temperature.
- Ionization smoke detectors: feature a harmless radioactive source within a dual detection chamber. They operate
by sensing for a change in electrical conductivity across the detection chamber.
- CO detectors: sense the levels of carbon monoxide given off by all carbon-based materials in the smouldering
stages of a fire (often combined with heat detection sensor).
2.
Input Module:
a device which monitors the status of another device (callpoint, detector, etc.) and sends the
respective information to the panel. The Input module allows the loop to accommodate any type of device.
3.
Output Module:
provides a supervised ancillary output. The cause of activation can be defined during the system
configuration phase. Allows you to interface all types of devices to the loop (e.g. bells, signaling devices, fire door
magnets, etc.).
4.
Callpoint:
a clearly indicated fire button with instructions for use in the event of fire. Usually located near the
entrance/exit of the protected building. These push-button alarm-trigger devices allow building occupants to
activate system alarms.
5.
Sounders/flashers:
audible/visual signaling devices.
Note:
Sounders and flashers can also be connected directly to the control panel outputs [E].
For the list of the devices the loop accommodates, and for details regarding their wiring and operating
principles, refer to
Appendix A - Enea series devices
,
Appendix B - Argus Devices
and
Appendix C - Apollo
devices
.
The loop circuit configuration (as required by the local Fire code in force) is a fault-tolerant circuit which, in
the event of short-circuit or loop interruption, allows the panel to continue to communicate and drive the
elements on either side of the interruption.
Isolator
In order to ensure a fault-tolerant loop circuit that is Fire code compliant, isolators must be installed in
series with the loop circuit. Isolators modules detect short-circuit conditions and consequently interrupt the
loop circuit. If a short-circuit occurs, the two isolators adjacent to the shorted section will open and split the
loop in such way as to allow the panel to drive the elements on either side of the interruption. No more
than 32 detectors/devices should be installed between two isolator modules.
Note:
Many detectors/devices have built-in isolators and therefore do not require isolator modules. Refer to
Appendix A - Enea series devices, Appendix B - Argus Devices and Appendix C - Apollo devices for
further details.
[B] SmartLetUSee/LCD-Lite repeater (accessory item)
This optional system enhancement tool (equipped with keypad, LEDs, fast buttons and display) replicates
all the system data. The panel supports 4 repeaters which can be connected to RS485 BUS (maximum
cable length 1000m from panel). Repeaters are usually located near the entrance/exit of the protected
building, in order to allow users to view the system status without going too far inside the building.
