System Trouble Mode of Operation 3. Operation of the Control Panel
NFS-640 Operations Manual P/N 51334:B 10/03/2003 25
System Trouble Mode of Operation
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 (TB9)
• 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 8 below.
• Sends a Trouble message to the LCD display, history buffer and installed printers, terminal
mode LCD-80s, and CRT-2s.
Note: If a fire alarm exists when a trouble exists, the SYSTEM TROUBLE LED lights, but the Alarm message appears in
the LCD display.
Typical Trouble message that appears on the LCD display:
Figure 8 Sample Trouble Message
How to Respond to a System Trouble
If the control panel indicates a trouble, you can do the following:
1. Press the
ACKNOWLEDGE/SCROLL DISPLAY key to silence the panel sounder and switch the SYSTEM
TROUBLE LED from flashing to steady—regardless of the number of troubles, alarms, security and
supervisory signals.
Note: Pressing the SIGNAL SILENCE key when only troubles exist, gives the same result as pressing the
ACKNOWLEDGE/SCROLL DISPLAY key. The SIGNALS SILENCED LED does not light unless an alarm exists in the
system.
2. The control panel sends an Acknowledge message to the History buffer and installed printers,
terminal mode LCD-80s, and CRT-2s.
Figure 9 Sample Acknowledge Message
3. Check the trouble message for the location and type of trouble.
Figure 10 Sample Trouble Messages on CRT-2 or Printer
4. Correct the condition causing the trouble. If the trouble clears, the control panel sends a Clear
Trouble message to the History buffer and installed printers, terminal mode LCD-80s, and CRT-2s.
Continued on the next page...
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 071401 2M147
Time and date of Acknowledge
Status banner
ACKNOWLEDGE
03:15P 071401 Sat
TROUBL MONITOR MODULE ADDRESS M021 Z00 OPEN CIRCUIT 08:10A 082095 2M021
TROUBL MONITOR MODULE ADDRESS M022 Z00 OPEN CIRCUIT 08:12A 082095 2M022
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