VESDA VLI Product Guide
VESDA by Xtralis
24
www.xtralis.com
3.2.8
Specify Backup Battery
In the event of a mains power supply disruption, the VLI detector runs on a backup battery. The size
of the battery is determined by:
l
local codes and standards
l
the total power required by the system
l
back up time required
l
allowance for reduction in capacity with age
l
expected temperature variations
Note:
It is recommended that batteries be inspected and changed as per manufacturer’s
specifications or as per local codes and standards.
To facilitate the calculation of the backup battery size, a Battery Calculation Sheet is included below.
Table 3-2: Calculating the size of backup battery
Equipment
Normal loads @ 24 V DC
Full alarm load @ 24 V DC
Load mA
Qty
Total
Load mA
Qty
Total
Detector
340
390
Remote Display
90
110
Remote Programmer
50
(backlight off)
110
(backlight on)
Hand-held Programmer 50
(backlight off)
110
(backlight on)
System Relay Module
60
105
Other 24V Loads
Total
mA
Total
mA
X
X
Standby Hours
Alarm Hours
=
Standby Capacity
Alarm Capacity
Total Capacity =
S Alarm
Divided by 1000 for
Standby Capacity
Multiply by battery
factor X1.25
Note:
If monitored GPI terminals are connected to the power supply and configured for external fault,
the aspirator speed will be maintained for one hour after the loss of mains power, after which the
aspirator speed will be limited to 3000 rpm to conserve power.
Содержание VESDA VLI
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