VESDA
®
LaserPLUS Product Guide
23
1.8 Power Source
There are two sets of power terminals on the termination card. Use one set to connect to a 24
VDC power supply and if required loop out to another device via the second set. The detector
has reverse polarity protection to minimize the risk of reverse power connection to the detector.
For further information see Product Specifications on page 8.
Caution: The LaserPLUS detector will not operate when the supply is reversed.
Note: Operating the detector when DC supply voltage is outside the voltage range of 18
VDC and 30 VDC may cause damage to the device.
Figure 22 - Wire connection details for power terminals on relays termination
card
1.9 Back Up Battery
The power supply for the LaserPLUS detector is switched to a back up battery in the event of a
mains power supply disruption. The size of the back up battery 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 inspected and changed as per manufacturer’s
specifications or as per your local codes and standards.
To facilitate the calculation of the backup battery size a Battery Calculation Sheet is included
below.
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