Bosch PRAESENSA Installation Manual page 17

Loudspeaker line isolator system
6.
Notice!
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You can connect the loop cable to either A or B side of FIM, both sides are equal. Do not
connect loop cable to T‑Branch connector!
7.
Notice!
Brand new FIMs are delivered in FACTORY RESET state. In this state loop relays on FIM's PCB
i
should be in open position. FACTORY RESET state for FIM is temporary. Soon after power up
FIM should switch relays to closed position, making a "click" sound, confirming correct relay
operation.
Figure 4.5: Side A of FIM connected to PRIMARY side of the loop
8.
9.
Figure 4.6: Both sides of FIM properly connected to the loop
10. If needed, connect the loudspeaker or T Branch line to FIM T‑Branch connector.
Bosch Security Systems B.V.
Connect FIM to the loop cable on the PRIMARY side of LDB. Mind the cable polarity!
FIM will power up indicating charging process (blue slow blinking). Wait for FIM to enter
SERVICE MODE (blue fast blinking).
Connect the outgoing loop cable to the loop connector on the other side of FIM. Mind the
cable polarity!
If the cabling is correct, FIM will remain in SERVICE MODE.
– If there's short circuit on the outgoing cable, FIM will change blinking colour to
orange, indicating problem. LDB will also detect short circuit and indicate it with
SHORT indicator. Fix the cabling before further installation.
Installation manual
Installation | en 17
2021.07.28 | V1.00 |