Siemens SPCK421 Spezifikationen Seite 270

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21
Appendix
Calculating the battery power requirements
270
Siemens AB
A6V10276959
Security Products
18.11.2011
JP9
+
1
3
4
5
6
2
Powering expanders from the auxiliary power terminals
1
SPC controller
2
Battery
3
Auxiliary 12 V power terminals
4
Keypad
5
Keypad
6
I/O expander
21.4 Calculating the battery power requirements
It is important that adequate stand-by power is available to supply all devices in the
event of a mains supply failure. To ensure that enough power is available, always
connect the appropriate back-up battery and PSU.
The table below gives an approximation of the maximum load current that can be
drawn from each type of battery over the given stand-by periods of 12 hours, 30
hours.
The approximations below assume that the SPC controller PCB is drawing its
maximum load (all wired inputs have their EOL resistors fitted) and that the usable
output power from the battery is 85 % of its maximum capacity.
0.85 x battery size (Ah)
-
(Icont + Ibell)
=
Imax
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