Cable Length And Cable Resistance - Siemens FS720 Mounting & Installation
Fire detection system
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Installing, exchanging and connecting modules
7
Remote EVAC-NL and EVAC-NL mimic display driver
7.32.4 Cable length and cable resistance
228 | 248
Building Technologies
Fire Safety
If using a remote EVAC-NL indicator and the EVAC mimic display driver, the length
of the power supply cable is limited if the component is supplied internally via the
periphery board.
The diagram below can be used to determine the maximum cable lengths for both
cases.
The following cable is specified for the power supply:
●
No shielding
●
Twisted pair cable
●
With at least 10 twists.
Please refer to the data for the corresponding component for the maximum RS485
interface cable length.
120
100
80
60
40
20
0
1
2
3
Figure 137: Diagram for calculating the max. cable resistance
1
Max. cable resistance R' for EVAC-NL mimic display driver
2
Max. cable resistance R' for remote EVAC-NL indicator
3
Max. current for remote EVAC-NL indicator
4
Max. current for EVAC-NL mimic display driver
4
5
6
7
x10 zones
1.8
4
1.5
1.2
0.9
3
0.6
0.3
2
1
0.0
8
9
10
A6V10210390_m_en_--
2018-08-29
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