NFS2-640 Operations P/N 52743:L4 06/10/19 25
System Trouble Mode of Operation Operation of the Control Panel
3.4.7 Interpreting MN Type Codes
The Type Code that displays in the fire panel message indicates the function of the point that initi-
ates the activation. The table below lists the Type Codes that can appear in an mass notification
message:
3.5 System Trouble Mode of Operation
3.5.1 How the Control Panel Indicates a System Trouble
The system goes into system trouble when the control panel detects an electrical fault. If no fire
alarms exist, the control panel does the following:
• Produces a pulsed audible tone
• Activates the Trouble relay (TB4)
• Flashes the
SYSTEM TROUBLE LED
• Displays a Type Code that indicates the type of device with a trouble.
•Displays
TROUBL in the status banner on the LCD display as well as the type of trouble and
information specific to the device, as shown in Figure 3.8 below.
• Sends a Trouble message to the LCD display, remote annunciators, history buffer, installed
printers, and CRT-2s.
Typical Trouble message that appears on the LCD display:
Figure 3.8 Sample Trouble Message
Type Code
Latching
(Y/N)
Purpose What it does
Monitor Modules
ECS/MN MONITOR
1
Y Indicates activation of a mass notification device Activates CBE, does not light any LEDs,
overrides existing fire event
2
, shuts off
silenceable outputs and all fire activated
strobes
ECS/MN SUPL
1
Y Indicates activation of a mass notification device Lights SUPERVISORY LED and activates
CBE
ECS/MN SUPT
1
N Indicates activation of a mass notification device Lights SUPERVISORY LED and activates
CBE
ECS/MN TROUBLE
MON
1
N Indicates trouble on a mass notification device Monitors mass notification devices. Will
generate a trouble condition for both open
and short conditions.
1
This Type Code is not compatible with First Command applications.
Table 3.2 Mass Notification Type Codes
NOTE: If a fire alarm exists when a trouble exists, the SYSTEM TROUBLE LED lights, but the Alarm
message appears in the LCD display.
Type of event
Type of device
Custom descriptor for
this device location
Device address
Time and date of trouble
Type of trouble
Extended 12 character
custom label
TROUBL PULL STATION INTENSIVE CARE UNIT
EASTERN WING INVREP 03:14P 041415 2M147
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