NFS2-640/E Installation Manual — P/N 52741:P2 7/10/14 13
System Components System Overview
2.2.2 Control Panel Circuit Board
The control panel electronics are contained on one printed circuit board that incorporates a
signaling line circuit (SLC) and the central processing unit (CPU). The built-in power supply
includes an integral battery charger. A keypad/display unit can be installed over the power supply;
see Figure 2.1. Wiring connections and system components are detailed in Figures 2.2 and 2.3.
Figure 2.1 NFS2-640/E Control Panel with Optional Keypad/Display Unit Installed
2.2.3 Main Power Supply (CPS-24/E)
The main power supply is an integral part of the NFS2-640/E and mounts directly over the control
panel’s circuit board. It provides a total of 3 A (6 A in alarm) and contains an integral battery
charger. This can be used for many functions including:
• Powering the NFS2-640/E
• Powering a variety of UL-listed 24 VDC notification appliances from four built-in NAC
outputs
• Providing up to 1.25 A of resettable power for four-wire smoke detectors
• Providing up to 1.25 A of non-resettable power for external devices such as the TM-4
Transmitter Module.
• Providing auxiliary 24 VDC power @ 0.5A and 5 VDC power @ 0.15A.
• Fuse: 8 amps, 250 V, 5 x 20 mm, Fast-Acting, ceramic, p/n 12117.
When AC Power is lost, the deeply-discharged battery cutoff protection will be invoked at 17 volts.
The power supply will be disconnected from the batteries. The power supply’s normal operation
will be restored when AC power returns.
See Figure 2.2, “CPU2-640/CPU2-640E and Power-Supply: Wiring Connections” and Figure 2.3,
“CPU2-640/CPU2-640E and Power-Supply: Jumpers, LEDs and Switches” for details.
CPU2-640-assyfront.wmf
DP-DISP2.wmf
Displayed
Behind DP-
DISP2
Mounted in
NFS2-640/E
Chassis
(with no
peripherals)
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