Power Supply - Bosch PRAESENSA Installation Manual

58 en | System controller | PRA-SCL/SCM/SCS
7.6.3

Power supply

The system controller must be powered from a 24 - 48 V power supply. If the system controller
is part of a certified emergency sound system, it must be powered from a PRAESENSA
multifunction power supply. In case the system controller and the power supply are mounted
in two different racks, double supply connections must be made. Even if both devices are in
the same rack, it is recommended to use double connections for fail-safe redundancy.
Follow the connection procedure below:
1.
2.
3.
4.
5.
2019.11 | V1.00 |
A
B
D
+
+
C
Crimp ferrules D onto the ends of the electrical wires of cable C to provide a solid and
reliable electrical connection. Use a dedicated crimping tool.
Insert each wire into the appropriate slot of the connector B, observing polarity. Wiring
color convention: red for + and black for -. Use a flat blade screwdriver to tighten each
connection.
Insert the cable into the 24 to 48 V input A, cut the cable to length and mount the
connector of the powering device to the other end of the cable, again observing polarity.
Insert this connector into output A of the powering device (e.g. the 24 V output of the
PRA-MPS3).
For redundancy, repeat these steps for a second cable to connect output B of the
powering device to input B of the system controller.
Alternatives:
– Instead of using the A/B outputs of a PRAESENSA powering device, also two
separate power supplies can be used. The maximum current rating of the supply
connectors is 8 A; only use a 24 - 48 V power supply that is current limited to < 8 A,
also in overload condition.
– When no power supply redundancy is required, a single power supply can be used.
C
Installation manual
PRA-MPSx
Bosch Security Systems B.V.
PRAESENSA