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4.3. iRIS8 TTE Loop Expander
The iRIS4 addressable fire alarm panel operates with iRIS8 TTE Loop Expanders. The communication with connected
to the loop addressable devices is via Teletek Electronics communication protocol.
The iRIS8 TTE Loop Expander (see item 4.3.2, Figure 20) realizes the connection between the Output Module and
devices connected to the communication line.
The iRIS8 TTE Loop Expander has two basic functions: 1. Gathers data from the devices in the communication line and
transfers it to the Output Module; 2. Receives commands from the Output Module and transfers them to the devices
connected in the communication line.
Every iRIS8 TTE Loop Expander support operation with up to 250 addressable devices.
The maximum current consumption (I
If the consumption exceeds this value an overload protection would be turned on.
In the configuration of iRIS4 addressable fire alarm panel could be mounted up to 4 loop expanders.
4.3.1. Permissible Cable Length
The maximum length of the loop in the system could vary according to the cross-section and the ohmic resistance of the
used cable.
Nevertheless, there is no specific requirement for cable description according to standard EN 54-2, the manufacturer
recommends using the listed cables in installations:
No
Brand
1
Mining Ltd Fire cable AF*
BERICA CAVI S.P.A ITALY
2
MULTICORE FLEX SCR
TEKAB FireTEK, SA7Z1,
3
ZA7Z1, MZA7Z1
4
Atron ACFF
5
Atron ACFR
6
Atron PIROFREN SOZ1-K
*This cable is tested and approved.
ATTENTION: iRIS8 TTE loop controller supports up to 250 devices!
To ensure the correct operation of the system is necessary to make some calculations in advance:
1. To ensure the ability of the fire
panel to receive the signals from the
devices in the loop, calculate:
≤ 123 / R
L
C1max
Where:
L
, L
and L
C1MAX
C2MAX
C3MAX
R
- is total ohmic resistance of the two wires of the used able; its value shows the magnitude of the cable resistance at
C
length 1km [Ω/km];
R
- is the total resistance of the isolator modules in the loop;
I
I
- is the maximum current consumption in the loop in alarm condition - total amount of the current consumption of all
max
devices in alarm state** in the loop.
Note: In case of using more than 15 devices SensoIRIS series from type T110/ T110 IS, S130/ S130IS, M140/ M140IS,
MCP150 and MC-Z, in calculation of I
15 devices with the highest consumption, and for the rest devices is used the consumption in stand-by mode**.
** For the max. current consumption in alarm state and the consumption in quiescent state with communication (stand-by mode) of a device refer to its
installation manual.
) of the devices in the communication line in alarm state must be up to 500mA.
max
Parameters
Unscreened, CEI 20/22 II IEC 60332-3, GR2, C-4 (U0=400V) CEI-UNEL-36762,
2
2x0.8mm
Screened, CEI 20/22 II CEI EN 60332-1-2, CL 5 CEI EN 60228 VDE 0295,
300/500V, 2x0.5/0.75/1.0/1.5mm
Screened, C/W BS 6387, Class-1/Class-2 BS 6360, 300/500V, 2x1.0/1.5/2.5mm
Screened, IEC332,2, 2x1.0/1.5/2.5mm
Screened, IEC332,2, 2x0.8mm
Screened, PH90 DIN EN 50200 TS IEC 60331-2, 300/500V, 2x0.8/1.5mm
2. To ensure the ability of the fire
panel to recognize the double
addresses in the system, calculate:
C
- are maximum permissible length of the used cable, [km];
value is used the maximum current consumption in alarm state** only for those
max
iRIS4 - Addressable Fire Alarm Panel – Installation Manual
2
2
≤ 62 / R
L
C2max
C
19
2
3. To ensure the ability of the devices
in the loop to receive command
signals from the panel, calculate:
≤ (12 / I
L
C3max
2
2
- R
) / R
max
i
C
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