2-8
The FIP is powered by the SPS (System Power Supply) which gets its primary power
from the AC mains and its secondary power from the backup batteries.
The 24VDC bulk power on the SPS is unregulated, and is divided into three feeds, i.e.
24V Card, 24V Signal, and 24V Aux Power. 24V Card, which supplies the slave cards,
and Aux power, which is accessible on screw terminals, are each rated at 2A and
protected by a PTC. The 27.3V regulated battery charger is powered from the bulk
supply and is switched off during alarm. The batteries only get connected to the bulk
supply when the mains supply fails. The charger has two programmable options of
rating, 1.4A for 6-18Ahr, and 3.3A for batteries above 18Ahr.
The “heavy” 24V Signal feed is only accessible via the NACs on the SPS, or via a wire
harness.
{xe "4100U: power connections"}{xe "system power: 4100U"}
IMPORTANT: AC power must be provided to the 4100ES from a dedicated
branch circuit.
In expansion bays, power and data are distributed via the power distribution interface
(PDI). The PDI is a wiring board with eight card slots, each of which can accommodate a
4-inch x 5-inch slave card. If legacy motherboards are used, they must be mounted over
the PDI using metal standoffs.
Standard cards used in Australian 4100ES, e.g. IDNet, are plugged onto the PDI and only
access the 24V Card supply.
{xe "4100U: power distribution interface"}{xe "power distribution interface (PDI):
about"}
4100 POWER DISTRIBUTION INTERFACE
ASSY 566-084
Figure 2-5. The Power Distribution Interface (PDI)
Introduction to FIPs (4100ES), Continued
System Power
The Power
Distribution
Interface (PDI)
POWER/COMMS
CONNECTORS
(P1-P3)
AUDIO
INTERFACE
CONNECTORS
(P6, P7)
POWER SOURCE
JUMPERS
(P4, P5)
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