Power Supply Module | Pra-Psm24, Pra-Psm48; Introduction; Functions - Bosch PRAESENSA Installation Manual

166 en | Power supply module | PRA-PSM24, PRA-PSM48
16

Power supply module | PRA-PSM24, PRA-PSM48

16.1

Introduction

The PRA-PSM24 and PRA-PSM48 are compact DIN‑rail mounted power supplies. The PRA-
PSM24 delivers 24 V at up to 10 A continuously, while the PRA-PSM48 delivers 48 V at up to
5 A continuously. These power supplies are OEM power supplies, made for Bosch by Delta
Power Supply, as a cost effective alternative to the PRAESENSA multifunction power supply
PRA-MPS3 in case the additional functions and characteristics of the multifunction power
supply are not needed. Also, the PRA-PSM24 and PRA-PSM48 are not certified for EN 54‑4 and
similar standards.
The PRA-PSM24 can be used to power a PRAESENSA system controller or other devices and
utilities that need 24 V.
Because of its ability to deliver high peak currents, the PRA-PSM48 can supply sufficient
power to a single fully loaded PRAESENSA 600 W power amplifier. The PRA-PSM48 can also
power a PRA-ES8P2S Ethernet switch with all its PoE outputs loaded.
16.2

Functions

Mains power supply
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PRA-PSM24
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PRA-PSM48
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2019.11 | V1.00 |
Universal mains input with power factor correction to maximize the amount of power that
can be taken from a single phase power distribution network.
The mains is supplied via a 3‑pole screw plug that requires the module to be installed by
professional installers and mounted in a safe place, without user access.
Compact DIN‑rail mounted power supply, delivering 24 V at up to 10 A continuously, for
powering various utilities and devices in Public Address systems.
Adjustable output voltage, 24 to 28 V.
For fail safe redundancy it is possible to use two 24 V power supplies for one PRAESENSA
system controller, one connected to its 24 V input A and the other to input B. In that
case, the power supply with the highest voltage will supply the power, the other one is
available as backup.
Compact DIN‑rail mounted power supply, delivering 48 V at up to 5 A continuously, for
powering one fully loaded PRAESENSA 600 W amplifier. Because the long term effective
power consumption of the amplifier is much lower than the short term burst power
consumption, related to the crest factor of speech and music, this power supply is
sufficiently powerful.
Adjustable output voltage, 48 to 56 V, of which the range 48 to 50 V can be used because
the PRAESENSA power amplifiers are tolerant up to 50 V.
For fail safe redundancy it is possible to use two 48 V power supplies for one amplifier,
one connected to its 48 V input A and the other to input B. In that case the amplifier load
will be shared by both power supplies, even if the supply voltages are adjusted to be
slightly different.
Installation manual
PRAESENSA
Bosch Security Systems B.V.