Output Circuit Trouble Mode of Operation 3. Operation of the Control Panel
NFS-640 Operations Manual P/N 51334:B 10/03/2003 37
How to Respond to a NAC, Panel Circuit or Control/Relay Trouble
If the control panel indicates an active NAC, Panel Circuit or Control/Relay Trouble, take the following action:
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, and
supervisory signals.
2. The control panel sends an Acknowledge message to the History buffer and installed printers,
terminal mode LCD-80s, and CRT-2s. Check the trouble message for the location and type of
trouble.
3. Correct the condition causing the trouble.
4. When the trouble condition is corrected, the panel will return to normal operation (indicated by the
“System Normal” message).
5. The control panel sends a “System Normal” message to the LCD display, History buffer and
installed printers, terminal mode LCD-80s, and CRT-2s.
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