Installing Pra-Lim (Fim) On A Loudspeaker Line - Bosch PRAESENSA Installation Manual

16 en | Installation
Notice!
If any short circuit is present on the speaker cable, LDB will immediately detect and isolate
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the shorted connector and SHORT indication will appear on LDB front panel. If the speaker
cable connects to ground causing earth leakage, LDB will detect the earth leakage and EARTH
fault indication will appear on LDB front panel. See PRA-LID (LDB) Indicators, buttons and
connections, page 9 .
5.
6.
7.
Multiple LDBs can share common fault contact or individual fault control contacts of the main
system. Fault contact sharing allows you to reduce number of control inputs needed for fault
reports. Detailed information about the location and type of fault is always available on LDBs
front panels, as well as via Sniffer PC application.
Multiple LDBs can also share common power amplifier or have individual power amplifiers
from the main system. Amplifier sharing allows you to create multiple loops within one zone,
each with individual surveillance.
Refer to
–
4.6

Installing PRA-LIM (FIM) on a loudspeaker line

Before you start connecting FIMs on the loop, make sure that LDB is connected to the rail and
powered. See Installing order PRA-LID (LDB), page 15 .
1.
2.
Notice!
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When the loudspeaker line isolator system is in SERVICE MODE, audio signal from power
amplifier is not transmitted to the loop.
3.
4.
5.
Notice!
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EOL switch (6) should be in ON position only with EOL resistor connected to the termination
of T‑Branch line. Short circuits on T‑Branch are detected and isolated regardless the EOL
monitoring switch.
2021.07.28 | V1.00 |
If system includes multiple loops (multiple LDBs), there is a number of ways you can
interconnect Loudspeaker line isolator to the Public Address / Voice Alarm system.
If you are planning to proceed with installation of FIM modules on the loop, leave the
SECONDARY output of LDB disconnected.
When loop is closed, and all FIMs on the loop are working properly, connect the incoming
loop cable to SECONDARY output of LDB. Loop is now fully secured.
PRA-LID (LDB) Indicators, buttons and connections, page 9
For most efficient installation make sure that LDB is in SERVICE MODE (blue MODE
indicator blinking fast).
– To put LDB into SERVICE MODE press SERVICE button for 10 seconds or use Sniffer
PC application.
During SERVICE MODE LDB will show OPEN fault indication as long as the loop is not
completely closed.
– This is the correct indication, since the loop should be closed only at the final stage
of installation, to make sure that the entire course of the loop is complete.
Double check if the loudspeaker line cable is connected to the PRIMARY loop output of
LDB and the SECONDARY loop output of LDB is not connected.
LDB should indicate only OPEN fault. If SHORT fault is detected, fix it before FIM
installation.
Check if EOL switch (6) on the FIM is in OFF position.
Installation manual
Loudspeaker line isolator system
Bosch Security Systems B.V.