Structure and function
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Building Technologies A6V10209291_f_en_--
Fire Safety & Security Products 05.02.2010
3.3.6 Line separator
All FDnet devices are equipped with a line separator.
The FDnet device is equipped with electronic switches which isolate the defective
part in case of a short-circuit on the detector line. The rest of the detector line
remains serviceable. On a loop line all FDnet devices remain fully functional after a
simple error.
3.3.7 Internal alarm indicator
The detector has an internal alarm indicator. The internal alarm indicator shows the
detector's operating condition (see table).
Operating condition Alarm indicator (AI) flashing
Normal AI flashes weakly every 4 seconds
Test AI flashes weakly every 0.5 seconds
Alarm AI lights up every second
3.3.8 Connection for external alarm indicators
You can connect two external alarm indicators to the detector. One external alarm
indicator can be connected to any detector in the FDnet. The trigger for activating
the alarm indicator can be programmed at the control panel.
Instead of an optical alarm indicator that flashes in the event of an alarm, the
sounder base is provided with an acoustic alarm indicator.
See also
Connection diagram [ 69]
Addressed sounder base FDSB291 [ 35]
3.3.9 Renovation mode
Select renovation mode if major work is being carried out in the room and large
volumes of dust or aerosols are being produced.
In renovation mode, the neural fire detector and the heat detector only trigger alarm
when the temperature exceeds 80 °C for 20 seconds.
The wide-spectrum smoke detector does not trigger alarms in renovation mode
but continues to work normally.
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