FBD-2
6
Part Number 18165, A, 04/03/2023
Connecting Sensors
Figure 3: Zone schematic
Power supply
The FBD-2 has a main and backup power supply input. A fault will be indicated on the front and
the fault output will be activated when one of the supplies fails. If only one supply is needed, the
main and backup supplies must be connected together to avoid generating a fault.
Zones
Unit has two zones. The zone output provides the sensor loop with 24V DC regardless of the
voltage supplied on the supply inputs. An End of Line resistor (EOL) of 5.6kΩ should be placed at
the end of the loop as show in Figure 3. Placing it at any other point will prevent open loop
detection from working properly. If a zone is unused the EOL resistor should still be connected.
Key Switch Input
A key switch can be added to only allow authorised personnel to accept a fire alarm. The switch
should be in the closed position when the key is turned. When no key switch is used this input
should be bridged.
Fault Output
Used with Vessel’s Monitoring System, contact factory for more information.
Alarm Output
Used with Vessel’s Monitoring System, contact factory for more information.
Buzzer Output
A buzzer can be connected to the buzzer contact. This is a potential free contact that closes when
a fire occurs. The voltage for the buzzer needs to be supplied externally.
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