22
en | Troubleshooting
Loudspeaker line isolator system
2021.07.28 | V1.00 |
Installation manual
Bosch Security Systems B.V.
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:
–
–
–
–
Wrong cable polarity – double twist, page 25
6.1.1
SHORT fault
LDB shows
SHORT
fault in following cases:
1.
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.
2.
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.
Summary of Contents for F.01U.393.727
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