Finding Short-Circuit In The Loop Line - Teletek electronics iRIS8 Installation Manual

In iRIS8 B can be added up to 8 loop expanders, distributed in two series – Loop expanders 1-4 connected to OUT1
control module and Loop expanders 5-8 connected to OUT2 control module.
The same organization is applied in configuration of panels iRIS8 S + iRIS8 Ext.
It is possible to distribute the Loop expanders to OUT1 and OUT2 control modules in random configuration depending
on the system organization. Note that, the iRIS8 panel will recognize the mounted loop expanders with their factory set
addresses, which may not be consecutive.
Examples:
The iRIS8 will recognise 4 loop expanders – 3
connected to OUT1 (numbers from 1 to 3) and 1
connected to OUT2 (number 5).
The loops will be set with the factory addresses:
•
Loop 1 – Address 3
•
Loop 2 – Address 4
•
Loop 3 – Address 5
•
Loop 5 – Address 7

4.5.5 Finding Short-Circuit in the Loop Line

The connection diagram shown on Figure 26, gives the possibility to provide operation of the loop in case of short-circuit
fault, using devices with built-in isolator modules. For example, short-circuit in section 2 will not influence the operation
of sections 1 and 3. The isolator modules at the both ends of section 2 will isolate it, and section 1 and 3 will continue
working properly, as section 1 will operate by supply from the channel "A" and section 3 - by supply from channel "B".
Since the fire panel will not be able to communicate with the devices from section 2, it will generate an alarm signal for
lost devices and open circuit.
The maximum recommended number of devices between two isolator modules (module isolator device or
using the built-in module isolator in a device) is 30!
Device with isolator
iRIS8 - Addressable Fire Alarm Panel – Installation Manual
The iRIS8 will recognise 4 loop expanders – 2
connected to OUT1 (numbers 1 and 2) and 2
connected to OUT2 (numbers 5 and 6).
The loops will be set with the factory addresses:
Figure 25
Section 2
Section 3
Channel В Channel А
Figure 26
23
•
Loop 1 – Address 3
•
Loop 2 – Address 4
•
Loop 5 – Address 7
•
Loop 6 – Address 8
Device with isolator
Section 1