VESDA-E VEP-A10-P Product Guide
44
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4.3.12 Specify Backup Battery
In the event of a mains power supply disruption, the VEP-A10-P detector runs on a backup battery located in
the external power supply (the power supply must be compliant with local fire protection codes and
standards). 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.
Equipment
Normal loads @ 24 V DC
(Backlight off)
Full alarm load @ 24 V DC
(Backlight on)
Load (A)
Qty
Total
Load (A)
Qty
Total
Detector set to Fan Speed 1
0.34
0.43
Detector set to Fan Speed 5
0.42
0.48
Other 24V Loads
Total
(A)
Total
(A)
X
X
Normal Hours
Alarm Hours
=
Normal Capacity
Alarm Capacity
Total Capacity =
Alarm
Multiply by battery
factor X1.25
Table 4-3: Calculating the size of backup battery
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