PRAESENSA Installation wiring | en 37
Bosch Security Systems B.V.
Underwriters Laboratories Listing Document (ULLD)
2021.12.21 | V0.15b | F.01U.402.882
Caution!
The chassis ground screw of an amplifier must be connected to protective ground before the
amplifier is connected to a power supply.
3.4.5 Power supply
The amplifier must be powered from a 48V PRAESENSA multifunction power supply (MPSx).
It is recommended to use double connections for fail-safe redundancy.
Follow the connection procedure below:
1. Crimp ferrules H onto the ends of the electrical wires of cable F to provide a solid and
reliable electrical connection.
– Use a dedicated crimping tool.
2. 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.
3. Insert the cable into the 48V 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.
4. For redundancy, repeat these steps for a second cable between output B of the powering
device to input B of the amplifier
– When no power supply redundancy is required, a single power supply can be used; in
that case connect the 48V inputs A and B in parallel to make use of the amplifier's
internal dual power converters for fail safe redundancy and to avoid a supply
supervision fault event. .
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