Physical Installation; End Of Line (Eol) Monitoring; Powering Of The Pra-Lid (Ldb); Pra-Lid (Ldb) | Enable Amplifier Detection Setting - Bosch PRAESENSA Installation Manual

Loudspeaker line isolator system
4.4.1

Physical installation

Certification of the PRAESENSA system and Line Isolator Drive (PRA-LID) includes the
cabinets (i.e. the enclosed 19"‑racks) in which the system elements are mounted. It is allowed
to use one or more cabinets, depending on the size of the system. Within the same cabinet
family, different heights are allowed up to a maximum height that depends on the brand and
type of an approved cabinet. The following cabinets have been approved for use:
–
–
–
–
4.4.2

End Of Line (EOL) monitoring

The PRAESENSA End Of Line (EOL) monitoring function cannot be used in combination with
Line Isolator Drive (PRA-LID). This means that for those loudspeaker output lines, where a
Line Isolator Drive (PRA-LID) is connected, this function needs to be disabled in PRAESENSA.
The EOL monitoring function will be taken over by the loudspeaker line isolator system and
reported via the PRA-LID to the PRAESENSA system.
In this case, the EOL reporting will be done via contact closers. Depending on the chosen
configuration, one or multiple PRA-LID contact closers will be connected to an contact input
on the PRAESENSA system. The input contact will be configured accordingly in the
PRAESENSA system.
4.4.3

Powering of the PRA-LID (LDB)

The PRA-LID (LDB) needs to be powered from the PRAESENSA Multifunction power supply,
large (PRA-MPS3). This to ensure a redundant and certified power source solution according
EN 54. One of the three 48 V outputs of the PRA-MPS3 device will be used for connecting only
PRA-LID (LDB) reaching from one PRA-LID (LDB) to a maximum of 16.
Notice!
i
The number of PRA-LID (LDB) you can connect to the PRA-MPS3 ranging from 1 to 16, is
depending on the configuration. The PRAESENSA power calculator can be used to determine
the exact number.
4.4.4

PRA-LID (LDB) | Enable Amplifier Detection setting

The Enable Amplifier Detection option in the PRA-LID (LDB) is not working in combination
with PRAESENSA. Therefore, make sure that this setting is disabled. This can be done via the
Sniffer tool (see LDB Sniffer User guide for more details).
4.5

Installing order PRA-LID (LDB)

1.
2.
3.
4.
Bosch Security Systems B.V.
Rital: TS, TS‑IT, CX25 series
Schroff: 20130073 PRAESIDEO
E.LAN: Diamond series
Knurr (Emerson): Miracel series
Fix LDB on a DIN‑rail, and connect 24/48 VDC power supply to power terminals on 5‑pin
rail connector.
– LDB should boot‑up, indicating boot progress with blue blinking on MODE indicator.
Within 15 seconds LDB will indicate OPEN fault, since AMP input as well as both LOOP
outputs are not connected.
Connect output of power amplifier to the AMP input of LDB.
– LDB is not sensitive for amplifier output polarity, however it is recommended to keep
the correct polarity to maintain best acoustic coherence of audio signal.
Connect the outgoing loop cable to PRIMARY output of LDB.
Installation manual
Installation | en 15
2021.07.28 | V1.00 |