Siemens FS720 - Page 68

Mounting and installing extinguishing control panels
Card cage connections (1 sector exting.) FCA2046
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68 | 248
Building Technologies
A6V10210390_m_en_
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Fire Safety
2018
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08
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29
Monitored output type EOL
Use Optical or acoustic warning devices, etc.
Monitoring polarity Reverse polarity
Monitoring Only in inactive state
Calibration Yes
2-way monitoring Not possible
Total load resistance, incl. cable 40…4000 Ω, EOL max. 3.3 kΩ
Max. cable resistance 80 Ω, both lines
Monitoring tolerance ±12.5 %, ±2.5 % dynamic
1 optical alarm device, illuminated warning panel
2 acoustic alarm devices, such as sounders, etc.
3 Fire controls
4 RT alarm
5 EOL standard value 3.3 kΩ, variable for EN 54-13
6 EOL for increased current loads, EN 54-13 outputs
Calculation of the cable resistance:
Step 1: calculate the critical cable resistance
RcableCrit = (24.8 V – UloadMin) / IloadMin + (UloadMin / Reol)
RcableCrit
Critical cable resistance [Ω] at which a fault is still displayed and
the load is still supplied to a sufficient extent.
ULoadMin Minimum voltage [V] at load, as per data sheet.
ILoadMin Minimum current [A] due to load at min. voltage, as per data sheet.
OUT_MON+
3
K
3
E
O
L
OUT_MON-
1
2
3
4
5
6
Reol
OUT_MON_+
OUT_MON_-
Rcable
Rload
Uload