Network Graphic Annunciator (NGA) Operations Guide P/N 9020-0675:B1 03/21/13 15
Section 3: LEDs and Audible Sounder
The NGA has the following five (5), front-panel LEDs and an audible sounder to provide visual
and audible indications of alarm, off-normal and trouble conditions.
The LEDs and audible sounder operation are described in the following sections:
3.1 Power On LED
The "POWER ON" LED lights when the system is operating on AC.
3.2 Alarm LED (Fire Alarm Events Only)
The "ALARM" LED blinks on/off and the sounder sounds an on/off pattern when the system is in
an alarm condition. The "ACK" button that appears on the display will acknowledge the alarm
condition that is currently displayed. Once all alarm conditions are acknowledged, the "ACK"
button will become disabled, the sounder will be silenced, and the "ALARM" LED will stay on
steady. The LED will extinguish when the system is restored to normal.
3.3 CO/Gas Alarm Operation
When a Carbon Monoxide (CO) Alarm event occurs, a text message labeled, "CO ALARM"
appears on the top right corner of the display panel.
Figure 3.3.1 illustrates the NGA screen with
the "CO ALARM" Event displayed.
•Power on •Alarm • Supervisory • System Trouble • Ground Fault
CO Alarm Event
If the CO Alarm is the highest priority event,
the following occurs:
• The Main window displays the following:
– Device that originated the event
– Time Stamp
– Descriptor
• The piezo buzzer sounds a coded-4
pattern.
• When an active CO Alarm condition
exists, the “CO Alarm” text that appears
at the top of the screen flashes.
After all CO alarms are acknowledged on
the E3 Series control panel, the coded-4
pattern stops. The system reports the CO
Alarm to the network with all of the
display nodes reporting, "CO ALARM."
In response to the CO Alarm text, the LED
indicator on the CO Alarm device appears lit
solid green. If both a CO and fire alarm occur
on the same device, the LED toggles between
a green signal, indicating a CO Alarm and a
red signal indicating a fire alarm. This feature
shows that both events originated from the
same device. The CO Alarm remains in alarm
until you reset the E3 Series control panel.
Figure 3.3.1 NGA Screen with CO
ALARM Event Display