Introduction to the TPS
The features of the TrueAlert Power Supply are:
• Three Signaling Line Circuits. The TPS provides uninterruptible power and control to three separate channels of TrueAlert addressable
notification appliances. Each channel is referred to as a Signaling Line Circuit (SLC) and is power limited, power limited is defined in NFPA 70
(National Electric Code). The SLCs can be either Class B (Style 4) or Class A (Style 6). Class A requires the installation of a Class A adapter board.
All SLCs are monitored for short and open circuits.
• 24VDC AUX Power. Provides up to 2 A of 24 VDC auxiliary power for use by the option cards.
• Internal Battery Charger. Charges up to 50 Ah (ULC-S527) or 110 Ah (UL-864 Listing) batteries connected to the power supply. The charger
circuitry provides status monitoring of battery connection, input power, and Earth faults.
Figure 1: Overview of TPS
Additional Features
• Full TrueAlert Operation. TrueAlert addressable notification appliances are individually addressed and receive power, supervision, and
control signals over the SLC. Horns sound with selectable high or low output, using a temporal, march time (60 or 120 beats per minute), or
continuous pattern. Horns are controlled separately from visible appliances installed on the same two-wire circuit. (Combination speaker/
strobe TrueAlert appliances receive audible control from separate audio circuit wiring.)
• Extensive Diagnostic Capabilities. LEDs on the TPS flash codes that identify the nature of trouble conditions. The TPS also monitors for
short and open circuits and positive and negative Earth fault status.
• Depleted Battery Cutout (Canadian Version Only). When AC Power fails, the Depleted Battery Cutout feature disconnects a battery from
the panel when its voltage is approximately 18 VDC.
• Visual Synchronization. A maximum of 46 MultiCandela addressable visuals may be synchronized per SLC. All SLCs are synchronized across
a TPS. All TPSs are synchronized across the FACP.
page 2 579-336 Rev. M
4100-5120, 4100-5121, 4100-5122 TrueAlert Power Supply Installation Instructions
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