1.3
95-8574
5
POwER SUPPLy/BaTTERy BaCkUP
The power supply/battery charger and backup batteries
convert 120 vac supply voltage to +24 vdc (nominal),
10 or 30 amperes to power the system. This includes:
• + 24 volts dc, 10 or 30 amperes power supply/battery
charger
• Two 12 vdc, sealed batteries connected in series.
If the backup batteries are not supplied by Det-Tronics,
they must meet the requirements of Figure 5 and ANSI/
NFPA-72.
Refer to the “Specifications” section for current and
back-up battery requirements.
BaTTERy FaILURE DETECTOR
The Battery Failure Detector (BFD) monitors up to
four battery strings in real time. Batteries can age or
deteriorate more quickly than expected due to high
temperature, over-voltage, deep discharges, and other
environmental and operating conditions. As a result,
battery failures can occur, decreasing battery capacity
and the ability to provide the necessary system
operating power.
The BFD monitors the overall battery voltage and the
mid-point voltage of each battery string in the system.
It reports an alarm if the monitored voltage is outside
the acceptable limits, indicating a battery problem.
The front of the BFD has a set of four switches, a series
of eight indicator LEDs and a 4-digit alphanumeric
display. The user interface menu is accessible using
the switches and display on the front panel. External
connections are made at the back of the BFD.
mOUNTINg RaCk
The R7404, R7494, R6006, and R1425 Modules fit into
a mounting rack, which is located within the system
enclosure. Two mounting rack types are available:
• Q4004 Universal Mounting Cage - standard rack,
holds all system modules (up to six)
• Q1020 Wall Mount Metal Enclosure - standard
rack inside IP55 rated enclosure provides added
protection.
SySTEm ENCLOSURE
An enclosure is provided that contains the external
wiring terminal strip and the mounting rack with all
R7404(s), R7494(s), the R6006, and the R1425 included.
Refer to the System Drawings for details and mounting
dimensions.
SYSTEM OPERATION
A brief description of a typical application is provided
below. Refer to the instruction manual for each device
for more detailed operational information.
In a typical application of the Fire Detection/Releasing
System, a fire sensed by the flame detectors and
processed by the R7404/R7494 Controller will cause
an assigned R6006 relay to energize, providing a relay
output to a fire panel. At the same time, the fire signal
will also cause the R1425 Detonator module to activate
a deluge valve. Manual trip stations and heat detectors
connect directly to the R1425, which will also cause the
deluge valve to release when those alarms are tripped
and provide a signal to the R6006, which in turn provides
a relay output to the fire panel. Because each system is
custom designed, input and output devices vary. Refer
to the System Drawings for further information.
B0640
1C
1B
1F
1A
1E
8
7
6
1D
2C
2B
2F
2A
2E
3
4
5
2D
Figure 4—R1425 Detonator Module Front Panel
