18 NFS2-640 Operations P/N 52743:L4 06/10/19
Operation of the Control Panel Normal Mode of Operation
3.2 Normal Mode of Operation
The system operates in Normal mode when no alarms or troubles exist. In Normal mode, the con-
trol panel displays a System Normal message as follows
Figure 3.1 Sample System Normal Message
In Normal mode, the control panel does the following functions at regular intervals:
• Polls all SLC devices and the four NACs to check for valid replies, alarms, troubles, circuit
integrity, supervisory signals, etc.
• Checks power supply troubles and batteries at 10-second intervals
• Sends a supervisory query on the optional FDU-80 and verifies proper response
• Refreshes the LCD display and the optional FDU-80 display and updates time
• Scans for any keypad or Control Key entries
• Performs a detector automatic test operation
• Tests system memory
• Monitors for microcontroller failure
3.3 Fire Alarm Mode of Operation
3.3.1 How the Control Panel Indicates a Fire Alarm
When an initiating device (detector or monitor module) activates, the control panel does the follow-
ing:
• Produces a steady audible tone
• Activates the System Alarm relay (TB4)
• Flashes the
FIRE ALARM LED
• Displays a Type Code that indicates the type of device that activated the fire alarm
•Displays
ALARM in the status banner on the LCD display, along with information specific to
the device, as shown below:
Figure 3.2 Sample Fire Alarm Display
• Sends an Alarm message to the LCD display, remote annunciators, History buffer, installed
printers, and CRT-2s.
• Latches the control panel in alarm. (You can not return the control panel to normal operation
until you correct the alarm condition and reset the control panel)
• Initiates any Control-By-Event actions
• Starts timers (such as Silence Inhibit, Auto Silence)
• Activates the general alarm zone (Z00)
SYSTEM NORMAL 01:56P 041515 Sat
Status banner
Type Code of initiating device
Custom descriptor for
this device location
Device address
Time and date of trouble
Extended 12 character
custom label
ALARM: PULL STATION INTENSIVE CARE UNIT
EASTERN WING Z004 03:10P 071415 2M147
Zone
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