PRAESENSA
Functionality | en
125
Bosch Security Systems B.V.
Underwriters Laboratories Listing Document (ULLD)
2021.12.21 | V0.15b | F.01U.402.882
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Class A, single or dual Class B wiring possible for loudspeaker outputs.
Sound quality
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Digital signal processing on all amplifier channels, including equalization, limiting and
delay.
Supervision
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Supervision of amplifier operation and all of its connections; faults are reported to the
system controller and logged.
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Loudspeaker line integrity supervision without interruption of audio, using end‑of‑line
devices (separately available).
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Network link supervision.
Fault tolerance
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Dual OMNEO network connections, for loop-through connections to adjacent devices.
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Dual 48 VDC inputs with polarity reversal protection, operating in tandem for redundancy.
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Fully independent amplifier channels; the integrated spare channel automatically replaces
a failing channel, with due regard of the actual sound processing settings.
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All amplifier channels support two independent loudspeaker groups, A and B, enabling
redundant loudspeaker wiring topologies.
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Backup analog audio lifeline input driving the spare amplifier channel to serve all
connected loudspeaker zones in case both network connections, or the amplifier network
interface, would fail.
5.3
End-of-line device | PRA-EOL-US
5.3.1
Functions
Supervision
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Reliable supervision of a single loudspeaker line, using loudspeakers connected in a
loop‑through fashion.
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Operation is based on pilot tone detection from the amplifier with feedback to the
amplifier using the loudspeaker line itself. No additional wiring is needed for fault or
status reporting.
5.4
Multifunction power supply, large | PRA-MPS3
5.4.1
Functions
Independent mains power supplies
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Three fully independent 48 VDC power supplies for up to three amplifiers.
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One 24 VDC output for a system controller or auxiliary device.
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All power supply outputs have double connectors for A/B redundant wiring to the
connected loads.
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A fault condition on one of the outputs does not affect any of the other outputs.
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Universal mains input with power factor correction to maximize the amount of power that
can be taken from a single phase power distribution network.
Backup battery solution
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Integrated charger for a 12 V VRLA (Valve Regulated Lead‑Acid) battery, with a capacity
up to 230 Ah for standards compliant charging and energy storage.
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Three fully independent battery to 48 VDC power converters for up to three amplifiers.
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Accurate battery impedance measurement to monitor aging of the battery and supervision
of battery connections.
