Routine Maintenance Inspection - Bosch PRAESENSA Installation Manual

30 en | Routine maintenance inspection
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:
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Refer to
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2021.07.28 | V1.00 |
Check if LDB is powered.
If LDB is indicating FAULT mode (orange LED blinking), see PRA-LID (LDB), page 22 .
– IMPORTANT: Continue to next steps only if LDB is indicating QUIESCENT mode.
Put LDB into SERVICE mode (press SERVICE button for 10 seconds).
Simulate short-circuit fault.
– Using a jumper make direct short between L+ and L- wire on PRIMARY 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.
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.
Put LDB into QUIESCENT mode.
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.
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.
Check cables and connectors between LDB and Public Address / Voice Alarm system.
PRA-LID (LDB), page 22
Installation manual
Loudspeaker line isolator system
Bosch Security Systems B.V.