Atest Gaz Alpa EcoTerm XT, User Manual

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6.1 Star system
In the conventional system each detector is individually connected to the control unit. This solution requires
the input of a large number of wires to the control unit, which can be a serious impediment to the assembly
– particularly in large buildings, and the increase in wiring costs.
Figure 2: Connection with the Alpa MOD LED8 control unit into a star-shaped system
6.2
Open alarm loop
In this arrangement, the detector are connected in series to the bus line via the XT T-shaped connector. An
advantage of this solution is significant facilitation of the system installation and reducing the wiring costs.
Figure 3: Connection with the Alpa MOD LED1 control unit into an open bus system
6.3
Closed alarm loop
This system is different from the previous one in terms of connection of the end of the supply and signal
line back to the control unit of the loop equipped with a test output (e.g. Alpa MOD LED1 Control Unit). In
this way, it is possible to improve the power supply conditions of the sensor and resistance to damage. In
this system it is also possible to check the loop continuity and the regularity of the system operation by
enforcing the alarm at the "test output of the loop" in the control unit. This makes it easier to carry out
periodic checks of the system.
Figure 4: Connection with the Alpa MOD LED1 control unit into a closed bus system
6.4 Other architectures
It is also possible to use modification of the described architectures. For example, by connecting several bus
systems to single inputs of the control unit, it is possible to create a system composed of several
independent zones using only one control unit. However, it is necessary to remember that it may be
possible to supply the bus systems from additional power sources that will provide adequate current
capacity of the system.
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User Manual: POD-044-ENG R01
Alpa
MOD LED1
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MOD LED8
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