3
The System Power Supply (SPS) and Remote Power Supply (RPS) are both intended to be placed in
remote cabinets that require a 24 VDC signal power, as well as battery charging capabilities. The
SPS and RPS receive battery and AC power from the Power Distribution Module (PDM).
The SPS and RPS provide 24 VDC to three notification appliance circuits. NACs can be Class B
(Style Y) or Class A (Style Z). They are power-limited according to UL 864. The NACs support
non-addressable TrueAlert and conventional reverse-polarity operation. SmartSync operation
allows separate audible/visible control on the same pair of wires. NACs are monitored for short
and open circuits. If a short circuit occurs, the affected NAC is not energized. During initialization,
the system checks to see if any NACs are shorted together.
The Notification Appliance Circuits on these modules can be used as Regulated 24 DC circuits, or
Special Application circuits. When used as 24 VDC Regulated circuits, only 4Amps of current is
available across the 3 circuits, and any 24 VDC appliance may be attached. When used as Special
Applications NACs, the full 9Amps of current is available at the 3 circuits, and only the compatible
appliances listed in Table 7 may be connected to these circuits. The SPS/RPS can synchronize
compatible appliances across all 3 circuits when those circuits are used as Special Applications
NACs.
Auxiliary power, relay, and relay module functions are also supported.
The SPS and RPS perform standard fire alarm functions, such as brownout detect, battery transfer,
battery recharge, and Earth fault detection. The detection circuits signal an earth fault trouble when
system field wiring is connected to earth via a resistance of 10K ohms minimum.
Additionally, the SPS provides an IDNet channel that supports initiating devices and some
notification appliances, such as the 4009-9201 and -9301 IDNet NAC Extender (see Table 7 for
compatible devices). The RPS does not provide an IDNet channel. A relay option module may be
connected to either the SPS or RPS.
It mounts in the same location as the city module on the SPS. The city module is not supported by
the RPS.
Continued on next page
Introduction to the SPS and RPS
Overview
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