104 en | Multifunction power supply, large | PRA-MPS3 PRAESENSA
2019.11 | V1.00 | Installation manual Bosch Security Systems B.V.
11 Multifunction power supply, large | PRA-MPS3
11.1 Introduction
This compact device combines multiple support functions to power and serve other
PRAESENSA system devices.
It can be used in a centralized system, but it is an enabler for decentralized system topologies
with several smaller racks or cabinets located across the premises, to reduce loudspeaker
cabling costs significantly.
It provides DC‑power supply to connected amplifiers and peripherals from the mains, with a
standards compliant charger for a single 12V backup battery, saving on installation and
battery maintenance costs.
The integrated 6‑port Ethernet switch, with glass fiber support, facilitates easy
interconnection of decentralized clusters of devices.
Configurable, supervised control inputs and voltage‑free control outputs are available as
interface to external equipment. Its OMNEO interface for control and fault reporting also
provides an analog audio backup lifeline for the connected amplifiers.
11.2 Functions
Independent mains power supplies
– Three fully independent 48VDC power supplies for up to three amplifiers.
– One 24VDC output for a system controller or auxiliary device.
– All power supply outputs have double connectors for A/B dual redundant wiring to the
connected loads.
– A fault condition on one of the outputs does not affect any of the other outputs.
– 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
– Integrated charger for a 12V VRLA (Valve Regulated Lead‑Acid) battery, with a capacity
up to 230Ah for standards compliant charging and energy storage.
– The battery life time for servicing is maximized by using a single 12V battery that has all
six battery cells at the same temperature and all cells using the same electrolyte. This
prevents unequal charging and consequently overcharging of series connected batteries,
which is the main cause of premature battery aging.
– Three fully independent battery to 48VDC power converters for up to three amplifiers.
– Flexible, pre‑terminated battery cabling of fixed length included, with fuse and battery
temperature sensor, for fast battery connection and predictive cabling resistance.
– Accurate battery impedance measurement to monitor aging of the battery and supervision
of battery connections.
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