Siemens FS720 Mounting & Installation page 68

Mounting and installing extinguishing control panels
6
Card cage connections (1 sector exting.) FCA2046
68 | 248
Building Technologies
Fire Safety
Monitored output type EOL
Use
Monitoring polarity
Monitoring
Calibration
2-way monitoring
Total load resistance, incl. cable 40...4000 Ω, EOL max. 3.3 kΩ
Max. cable resistance
Monitoring tolerance
OUT_MON+
OUT_MON-
1
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:
OUT_MON_+
Rcable
OUT_MON_-
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.
Optical or acoustic warning devices, etc.
Reverse polarity
Only in inactive state
Yes
Not possible
80 Ω, both lines
±12.5 %, ±2.5 % dynamic
3 4
2
Reol
Rload
Uload
5 6
A6V10210390_m_en_--
2018-08-29