Argina CM+ Installation Instructions Manual - Page 6
Browse online or download pdf Installation Instructions Manual for Control Unit Argina CM+. Argina CM+ 20 pages. Conventional fire alarm control panel
Print PageCalculating autonomy
The battery capacity is chosen as a function of the desired autonomy of the fire alarm system in
the event of a mains failure, for example 24 or 72 hours.
First calculate the total power consumption.
main PCB:
zone in operation:
relay PCB:
integral operating panel:
External operating panel:
current for external devices: e.g. door magnet 75 mA
Example: CM+ with 10 zones, 1 integrated and 1 external operating panel, 1 door magnet = 56
mA+ 3.5 mA+ 3.5 mA+ 75 mA = 148 mA = 0.14 A
Assuming that autonomy has to be for 24 hours: this means that the capacity required is 0.14 A
x 24 hours, which is 3.4 Ah.
The batteries must furthermore be capable of supplying power for 30 minutes in the event of an
alarm:
for example with 10 sirens rated at 40 mA: 10 x 0.040 A x 0.5 hours = 0.2 Ah
A safety factor of at least 1.2 is applied to arrive at the capacity required:
1.2 x ( 3.4 Ah + 0.2 Ah) = 4.3 Ah. A 7 Ah battery set would therefore be a good choice.
7.5 mA +10 mA per activated relay
5 mA
6 mA per activated relay
3.5 mA
3.5 mA