Bosch PRAESENSA PRA-MPS3 Multifunction power supply, large

• Fully supervised DC‑power supply with integrated fail-safe redundancy
• Unique single 12 V battery backup solution
• Integrated 6‑port Ethernet switch on RJ45 and SFP
• General purpose control inputs and outputs
• Backup lifeline for connected amplifiers

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 12 V 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.

Functions
Independent mains power supplies

• Three fully independent 48 VDC power supplies for up to three amplifiers.
• One 24 VDC 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 12 V VRLA (Valve Regulated Lead‑Acid) battery, with a capacity up to 230 Ah for standards compliant charging and energy storage.
• The battery life time for servicing is maximized by using a single 12 V 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 48 VDC 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.

Ethernet switch

• Six OMNEO network ports, supporting Rapid Spanning Tree Protocol (RSTP), for loop‑through connections to adjacent devices:

1. Five ports are for copper connection on RJ45, two of them provide Power over Ethernet (PoE) to supply power to connected call stations or other devices.
2. One port provides an SFP‑cage for Small Form‑factor Pluggable transceivers for single or multi‑mode glass fiber connections.

General purpose control inputs and outputs

• Eight control inputs to receive signals from external systems with configurable connection supervision.
• Eight voltage free single pole, double throw (SPDT) relay contacts to activate external devices.
• Control input and output functions are software configurable.

Fault tolerance and supervision

• Supervision of mains, battery and device operation and all connections; faults are reported to the system controller and logged.
• Automatic battery backup takeover from mains in case of mains failures.
• Multi‑port network interface with RSTP‑support for recovery from a failing network connection.
• Supervised audio lifeline to connected amplifiers, as backup for a failing amplifier network interface.