Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Page 2-14 Issue 1
February 2001
2.6 Power Supplies
An optional self-contained assembly supplies power to a single HSSD system.
2.6.1 Self Contained Power Supply
The self contained power supply powers a single Detector, with or without a Display Module including 4
hours of battery backup.
Table 2.4 Self Contained Power Supply Assembly
DESCRIPTION SPECIFICATION
Part Number 53836-K185
Weight (including batteries) 3.1 kg (7 lbs)
Finish Polycarbonate Material Light Grey Cover with painted steel backbox
Input Voltage 90 to 260 V AC 50/60 Hz
Maximum Input Current 1 A
Operating Temperature
0°C to 52°C with no de-rating
Operating Humidity 10 to 95% non condensing
Output Voltage 28.75 V DC
Output Current Maximum 1 A
Battery Charging Voltage 27.3 V DC
Battery Charge Circuit Fuses 500 mA
Trouble Relay Normally closed contacts, 1 Amp @ 28 V DC., resistive
Batteries Yuasa NP2-12 (12V 2.0 AH) x2
2.6.2 Battery Calculation
The calculation used for determining the battery requirements for the Detector is detailed as follows:
Minimum Battery Capacity (Amps Per Hour) = 1.25 x ((S x A) + (1.75 x ((A + B)/2)))
Where S = standby period in hours.
A = quiescent current in amps.
B = alarm current in amps.