Troubleshooting; Pra-Lid (Ldb); Short Fault - Bosch PRAESENSA Installation Manual
Loudspeaker line isolator system
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Also See for PRAESENSA:
- Installation manual (194 pages) ,
- Manual (166 pages) ,
- Release notes (24 pages)
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22
en | Troubleshooting
6
Troubleshooting
The effort and time spent of finding and fixing loudspeaker line faults with the loudspeaker
line isolator system is reduced to minimum. Loudspeaker line isolator is designed to locate
and report the exact location of a fault, even long time after its occurrence. You can repeat
troubleshoot procedures multiple times, any time you want, making sure that repair works will
be efficient and accurate.
6.1
PRA-LID (LDB)
Finding a loudspeaker line fault usually starts at the main system rack, where LDB devices are
located. Observe LDB front panels and compare the indications.
See PRA-LID (LDB) Indicators, buttons and connections, page 9 .
Multiple faults can be shown on LDB at the same time. SHORT, OPEN and EARTH fault may
be detected and indicated simultaneously and should be investigated individually.
If fault indications on LDB are in "memory" state (slow blinking), simply push RESET button
on LDB and after reboot LDB will return to QUIESCENT mode.
The following chapters relates to situation:
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6.1.1
SHORT fault
LDB shows SHORT fault in following cases:
1.
2.
2021.07.28 | V1.00 |
SHORT fault, page 22
OPEN fault, page 24
EARTH fault, page 25
Wrong cable polarity – double twist, page 25
Short circuit on the loop, between FIM modules.
–
In this case SHORT fault is located in the field, not directly at LDB connector. FIM
modules are isolating faulty section of the cable, so the loop stays open until the
short circuit is removed. In this state reset of LDB will clear the SHORT indication
and LDB will detect loop open fault, indicating OPEN active.
Short circuit on the PRIMARY or SECONDARY port of LDB.
–
In this case short circuit is located adjacent to LDB, therefore LDB detects the fault
directly and any attempt to reset LDB brings no result - LDB returns to SHORT active
state.
Installation manual
Loudspeaker line isolator system
Bosch Security Systems B.V.
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