30
en | Routine maintenance inspection
Loudspeaker line isolator system
2021.07.28 | V1.00 |
Installation manual
Bosch Security Systems B.V.
7
Routine maintenance inspection
In order to check correct operation in case of potential cabling failure, simulate faults and
observe system reaction. Perform following procedure:
1.
Check if LDB is
powered
.
2.
If LDB is indicating
FAULT
mode (orange LED blinking), see
–
IMPORTANT
: Continue to next steps only if LDB is indicating
QUIESCENT
mode.
3.
Put LDB into
SERVICE
mode (press
SERVICE
button for 10 seconds).
4.
Simulate
short-circuit
fault.
–
Using a jumper make direct short between L+ and L- wire on
PRIMAR
Y or
SECONDARY
output of LDB.
–
Confirm that
SHORT
indication on LDB appears.
–
Confirm that fault contact was activated.
–
Remove the short circuit. Confirm that
SHORT
indication on LDB disappears.
5.
Simulate
open loop
fault
–
Disconnect loop cable from
PRIMARY
or
SECONDARY
output of LDB.
–
Confirm that
OPEN
indication on LDB appears.
–
Confirm that fault contact was activated.
–
Connect the loop cable back to LDB. Confirm that
OPEN
indication on LDB
disappears.
6.
Put LDB into
QUIESCENT
mode.
7.
Simulate
earth leakage
fault:
–
Make direct connection between L+ or L- wire to ground potential (Ground pin of
LDB)
–
Confirm that
EARTH
indication on LDB appears.
–
Confirm that fault contact was activated.
–
Remove the connection between L+ or L- to earth.
–
Confirm that
EARTH
“active” (fast) indication on LDB turns into “memory” (slow).
–
Reset LDB into
QUIESCENT
mode.
8.
Simulate
ground wire open
fault (optional)
–
Open ground wire on
PRIMARY
or
SECONDARY
output of LDB.
–
Confirm that
EARTH
indication on LDB appears.
–
Confirm that fault contact was activated.
–
Connect ground wire back to LDB.
–
Confirm that
EARTH
“active” (fast) indication on LDB turns into “memory” (slow).
–
Reset LDB into
QUIESCENT
mode.
9.
Check
cables and connectors
between LDB and Public Address / Voice Alarm system.
Refer to
–
Summary of Contents for F.01U.393.727
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