Xtralis VESDA VLC-500-EX, Руководство по эксплуатации продукта

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VESDA by Xtralis VESDA VLC-EX Product Guide
www.xtralis.com 27
8 Battery Backup
The power supply for the VESDA VLC-EX detector may be switched to a back up battery in the event of the
supply being disrupted. The size of the battery back up is determined by local standards and codes, the total
power required by the system, back up time required, allowance for reduction in capacity with age and
expected temperature variations.
Note: It is recommended that batteries be changed as per the battery manufacturer’s specifications or as
per the relevant local codes and standards.
8.1 Backup battery size calculation sheet
Normal Load @ 24 VDC Full alarm load @ 24 VDC
Equipment Load mA Number Total Load mA Number Total
Detector 225 245
Remote Display 90 110
Remote Programmer 50
(backlight
off)
110
(backlight
on)
Hand-held Programmer 50
(backlight
off)
110
(backlight
on)
Other 24 V loads
Total mA Total mA
X X
Standby hours Alarm hours
=
Standby capacity Alarm capacity
Total capacity = S Alarm capacity
Divided by 1000 for standby capacity
Multiplied by battery factor (Normally 1.25)
Table 8-1: Calculating the size of backup battery
Note: The PSU is usually located in a non-hazardous area and may supply power via a Zener barrier (or
other similar energy limiting device) but this is not required for safe operation of the VESDA VLC-
EX in normal operation. Refer to the notes in Section 6.1 for further information.