Honeywell FS20X Series, User Manual, Page: 36 / 48

36
FS20X Fire and Flame Detectors
Fault Conditions
When a fault (trouble) condition occurs, the yellow LED will illuminate. See Figure
3-6 for the location of the Yellow LED.
Figure 29. Yellow LED location
Fault condition output
Fault relay activation
4-20mA output
4-20 mA (sink) output
3
2 mA (self-test/window obscuration fault)
0 mA (all other faults)
4-20 mA (source) output
4
2 mA (self-test/window obscuration fault)
0 mA (all other faults)
R2-485 output
RS485 FireBusII fault notification
4
RS-485 Modbus fault notification
4
Causes of fault conditions:
● Under voltage input power (<18 VDC).
● Over voltage input power (>32 VDC).
● Over temperature (>85 °C or 185 °F for the standard version).
● Under temperature (<-40 °C or -40 °F for the standard version).
● One or more microprocessor failures.
● One or more relay coil failures.
● Communication fault.
3 only one active fault output from these three