3. Operation of the Control Panel
Active Trouble Monitor Mode of Operation
34
NFS-640 Operations Manual P/N 51334:B 10/03/2003
Active Trouble Monitor Mode of Operation
How the Control Panel Indicates an Active Trouble Monitor
Trouble Monitor Points are monitor modules programmed with the following Type Codes:
Table 8 Trouble Monitor Type Codes
These types of monitor modules operate like monitored system functions that can produce troubles—
but with the following differences:
•
The LCD display status banner displays
ACTIVE
as shown:
Figure 16 Sample Trouble Monitor Point Message
•
The monitor module is non-latching: the module will return to normal when the trouble
condition no longer exists.
•
The monitor modules activate Control-by-Event
•
The panel trouble relay transfers (TB-9)
How to Respond to an Active Trouble Monitor
If the control panel indicates an active Trouble Monitor Point, 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.
Type Code
Latching
(Y/N)
Device Function
Point Function
AUDIO SYSTEM
N
Used for monitoring audio equipment audio amplifiers
or associated equipment
Activates CBE
EQUIP
MONITR
N
Used for recording access to monitored equipment
Activates CBE
POWER MONITR
N
Used to monitor remote power supplies or other
external equipment
Activates CBE
TROUBLE MON
N
Used to monitor remote power supplies or other
external equipment
Activates CBE
Status banner
Type Code
TROUBL TROUBLE_MON
INTENSIVE CARE UNIT
EASTERN WING
09:38A 071401 1M044
Custom descriptor for
this device location
Device address
Time and date of trouble
Extended 12 character
custom label
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