Power Supply Connection; Fault Relay Connection; Approvals - Bosch PRAESENSA Installation Manual

PRAESENSA
14.5.2

Power supply connection

This Ethernet switch has dual redundant 24 to 48 V DC-inputs. In case no battery backup is
required, it can be powered from a PRA-PSM24 or PRA-PSM48 power supply. In case the
switch is used in a Voice Alarm system, compliant to EN54‑16, the switch must be powered
from an EN54‑4 certified power supply, like the PRA-MPS3.
When the switch is powered by the PRA-MPS3 multifunction power supply, it must be
connected to one of the 48 V outputs, normally intended for the amplifiers. Use both A and B
outputs for connection redundancy. The 24 V output of the PRA-MPS3 is not powerful enough
for this switch. The 48 V output that is powering the switch should not be used to also power
an amplifier. Especially when the switch is serving multiple PoE powered devices as PSE
(Power Sourcing Equipment), its power consumption can raise to 140 W. The remaining
power capacity of the 48 V supply is not sufficient anymore for an amplifier under various load
conditions.
The lifeline that belongs to the powering 48 V output is not used, so the 48 V output will not
be disabled as would be for amplifiers in sleep/snooze mode to save power. It is also essential
that the 48 V for the switch is not disabled at any time. In case of mains failure the switch will
be powered from the battery, connected to the multifunction power supply.
14.5.3

Fault relay connection

The switch has a fault relay output to report faults. This relay can be connected to one of the
control inputs of the PRA-MPS3, configured as 'External fault input', to transfer switch faults
to the PRAESENSA system. This switch does not communicate via OMNEO to the PRAESENSA
system controller.
14.6

Approvals

Emergency standard certifications
Europe
International
Regulatory areas
Safety
Immunity
Emissions
Railway
Shock
Freefall
Vibration
Bosch Security Systems B.V.
EN 54‑16
ISO 7240‑16
UL 508
EN 55024
EN 61000‑4‑2
EN 61000‑4‑3
EN 61000‑4‑4
EN 61000‑4‑5
EN 61000‑4‑6
EN 61000‑4‑8
EN 55032 class A
EN 61000‑6‑4
FCC‑47 part 15B class A
EN 50121‑4
IEC 60068‑2‑27
IEC 60068‑2‑32
IEC 60068‑2‑6
Installation manual
Ethernet switch | PRA-ES8P2S | en 157
2019.11 | V1.00 |