FDU-80 Instruction Manual — P/N 51264:C2 4/24/2019 11
LED Indicators Operation
3.2.5 Reset
When the System Reset switch is pressed and released, the FDU-80 sends a Reset command to the control panel. This will turn off all
control modules and Notification Appliance Circuits, temporarily turns off resettable power to 4-wire detectors, causes a 'System All
Normal' message to be displayed on the FDU-80 and sends a 'System Reset' message to the FACP display, printer and FACP history
files. It also turns on all system LEDs, piezo sounders and LCD display segments as long as the Reset switch is held (lamp test). Any
alarm or trouble that exists after a Reset will resound the system.
3.3 LED Indicators
AC Power
This is a green LED which illuminates if AC power is applied to the host FACP. The green LED will turn off if AC power to the host
FACP is lost.
Alarm
This is a red LED that turns on steady when one or more fire alarms occur. The Alarm LED turns off when the Reset switch is pressed.
Supervisory
This is a yellow LED that turns on steady when one or more supervisory conditions occur, such as a sprinkler valve tamper condition. It
turns off when the Reset switch is pressed.
Trouble
This is a yellow LED that turns on steady when one or more trouble conditions occur. The LED turns off when all trouble conditions are
cleared. This LED will also illuminate if the microprocessor watchdog circuit within the FDU-80 is activated.
Alarm Silenced
This is a yellow LED that turns on when the Silence switch is pressed to turn off the Notification Appliance Circuits. The LED turns off
when the NACs turn back on or when the alarm condition is cleared and the FACP is reset back to a normal condition.
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