2-6
Chapter 2 Installing FACP Components
SPS CPU Bay Overview (continued)
System Power
Supply (SPS)
The SPS is the power source for the CPU. The SPS provides 24 VDC card power to the CPU
motherboard, which is distributed to other bays up to 2A capacity.
The SPS provides voltage and current information to the CPU card, which can then be
displayed at the user interface. The SPS provides an IDNet channel that supports initiating
devices and some notification appliances, such as the 4009-9201/9301 Audio NAC Extender.
The SPS also has three on-board NACs that support reverse polarity or SmartSync supervision.
Auxiliary power, relay, and city circuit/relay module functions are also supported.
The SPS performs standard fire alarm functions, such as brownout detect, battery transfer,
battery recharge, earth fault detection, and power limiting per UL 864.
Figure 2-4 is an illustration of the SPS.
Figure 2-4. System Power Supply (566-071)
CITY / RELAY CARD
MOUNTING AREA
CITY CARD
CONNECTOR (P7)
AUXILIARY RELAY
TERMINAL BLOCK
(TB4)
AUXILIARY POWER
TERMINAL BLOCK
(TB3)
AC
CONNECTOR
(bulkhead connector on
BATTERY
CONNECTORS:
P4
P5
LEGACY POWER/COMM TO
CPU
MOTHERBOARD
(P8)
DEVICE ADDRESS
SWITCH (SW1)
SHIELD SWITCH
(P2)
CITY/RELAY CARD
TROUBLE INDICATION
SWITCH (P3)
EARTH
FAULT
MONITOR
SWITCH (P1)
NAC TERMINAL BLOCK (TB2)
IDNET TERMINAL BLOCK (TB1)
POWER/COMM TO
CPU MOTHERBOARD (P6)
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