Siemens XC1003-A - Page 30

Connections
30
Building Technologies A6V10257473_e_en_--
Fire Safety 2015-03-04
7.2.1 Battery capacity calculation
Battery capacity must be calculated according to the following formula:
K
Batt
= ((I
R total
* t
R
) + (I
A total
* t
A
)) * K
dis
* K
age
K
Batt
: battery capacity (Ah)
I
R total
: operating current, internal and external in standby condition (A)
I
A total
: operating current, internal and external in alarm condition (A)
t
R
: required backup time in standby condition (hours)
t
A
: required backup time in alarm condition (hours)
K
dis
: = 1.1 drops in capacity, applicable only for 12 hours backup time or less
K
age
: = 1.25 safety factor, applicable only for 24 hours backup time or less
To define the operating current, all internal and external devices connected to the
XC10 shall be taken into account:
- all components installed inside the XC100x-A are considered as internal
devices, i.e.: XCA1030, XCA1031, relay modules, etc.
- all components installed outside the XC100x-A are considered as external
devices, i.e.: actuator, sounders, warning panels, repeater terminals (when
supplied by the XC10), etc.
Components
Current consumption (A) / 24 VDC
Standby condition
Alarm condition
XCM1002 0.168 0.247
Actuator 0 See component datasheet
Warning panel 0 See component datasheet
Sounder 0 See component datasheet
Fire controls 0 See component datasheet
XT1001-A1 powered by XC10 0.012 0.020
XCA1031 0.114 0.141
Single-sector installation example:
– 2 actuators (POUSSAX24) activated during 10 seconds (360mA each)
– 6 warning panels (70mA each)
– 10 sounders (20mA each)
– 2 repeaters XT1001-A1 powered by XC10
Battery capacity calculation for 12, 24 and 72 hours backup time, followed by an
alarm condition during 15 mn:
è I
R total
= 0.168 + (0.012 x 2) = 0.192 A
è I
A total
= 0.247 + (0.020 x 2) + ((0.360 x 2) x (10 / (15 x 60))) + (0.070 x 6) +
(0.020 x 10) = 0.915 A
è 12 hours : K
Batt
= ((0.192 x 12) + (0.915 x 0.25)) x 1.1 x 1.25 = 3.48 Ah
è 24 hours : K
Batt
= ((0.192 x 24) + (0.915 x 0.25)) x 1.25 = 6.04 Ah
è 72 hours : K
Batt
= ((0.192 x 72) + (0.91 x 0.25)) = 14.05 Ah
Multi-sector installation example:
– 4 solenoid valves (DEMAFM or DEMADEM) activated during 10 seconds
(400mA each)
– 1 actuator POUSSAX24 connected to XCA1031
– 12 warning panels (70mA each)
– 10 sounders (20mA each)