58 NFS-320/E/C Installation Manual — P/N 52745:M2 7/1/14
Appendix B: Electrical Specifications
B.1 Electrical Specifications
AC Power
Batteries
The control panel uses only sealed lead-acid batteries for secondary standby power. Maximum bat-
tery capacity for the CPS-24/E main power supply is 200 AH. The NFS-320 enclosure provides
space for up to two 26 AH batteries. Use external battery boxes if the installation requires larger
capacity batteries; see Table A.5, “Selecting Battery and Battery Backbox,” on page 57.
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.
The table below contains battery charger specifications.
Signaling Line Circuit (SLC)
Component Values
Main Power Supply 120 VAC, 50/60 Hz, 5.0 A; or
220-240 VAC, 50/60 Hz, 2.5 A
Wire size Maximum 12 AWG (3.31 mm
2
) with 600 VAC insulation
NOTE: If using an auxiliary power supply such as FCPS-24S6/S8 or APS-6R, refer to the
documentation for that equipment.
Charger Description Specifications
CPS-24/E
Main Power Supply
An internal battery charger
for 18 AH to 200 AH
Normal Charge: 27.6 VDC +/- 0.24 VDC
Charging Current: 2.0 A or 5.7 A (Software selectable)
CHG-120
Battery Charger
An external battery charger
designed to charge lead-acid
batteries between 26 AH and
120 AH
Dual Rate: High Charge: 28.1 VDC
Normal Charge: 27.6 VDC
Charging Current: 4.5 A
ACPS-2406
Auxiliary
Charger/Power
Supply
An internal battery charger
for 7 AH to 26 AH
Normal Charge: 27.6 VDC
Charging Current: 1.1 A max (0.750 A typical)
ACPS-610
Addressable
Charger/Power
Supply
An internal battery charger
for 12 AH to 200 AH
Normal Charge: 27.6 VDC +/- 0.24 VDC
Charging Current: 2A, 5A, or OFF
(Software Selectable)
Item Value
Voltage 24 VDC nominal, 27.6 VDC maximum
Maximum length 12,500 ft. (3810 m) total loop length (NFPA Style 4, 6, and 7)
Note: Refer to Appendix B.2 “Wire Requirements” for limitations.
Maximum current 400 mA peak, (max short circuit; circuit will shut down until short is fixed). For
battery calculations use 200mA.
Maximum resistance 50 ohms (supervised and power-limited)
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