Short Loop - Bosch PRAESENSA Installation Manual

Loudspeaker line isolator system
6.2.1

Short loop

If loop is shorted on either of the sections connected directly to FIM, the LED indicator on the
faulty section side will blink orange fast. FIM is isolating the faulty section with open relay.
T‑Branch is still operational and fed with audio from the healthy side of the loop.
See PRA-LIM (FIM) Indicators, buttons and connections, page 11 .
Short on side A
Possible solution
Remove the short‑circuit from the loop section. When the problem is fixed, the fast blinking
indication on FIM will turn slow. Now you can reset FIM to QUIESCENT mode, where both A
and B relays are closed. To reset FIM:
1.
2.
Bosch Security Systems B.V.
Push RESET button on the FIM module. Or,
send REMOTE FIM RESET command by pressing RESET button on LDB for 10 seconds or
via Sniffer application.
Short on side B
Installation manual
Troubleshooting | en 27
2021.07.28 | V1.00 |