SECTION 3
TROUBLE CONDITIONS
INTRODUCTION
NOTE:
Refer to Figure 3 for locations of Operator interface Panel LEDs and keys.
When a System Trouble Condition is detected by the NDU, the condition is indicated by the following:
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Yellow ‘SYSTEM TROUBLE” LED on the interface panel is flashing
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Tone-alert is ON steady
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Annunciator LEDs may illuminate (if installed)
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Alphanumeric display on the interface panel shows the following message.
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**TROUBLE**
Press <ACK> to review.
ALARMS = 0
SUPERVISORY = 0
TROUBLE = 1
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The interface panel has a yellow SYSTEM TROUBLE LED which lights whenever a trouble is present in the system.
When a trouble occurs, the LED flashes, the tone-alert sounds steady, and a trouble message is displayed on the
alphanumeric display. The trouble LED glows steady and the tone-alert is silenced when the cTBL ACK> key is
pressed.
When Global Acknowledge is used, and the trouble clears, the system automatically clears without user intervention.
After approximately 60 seconds, the NDU alphanumeric display should indicate a normal system, as shown below.
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1
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SYSTEM IS NORMAL
8:32:45 MON 7 DEC 92
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When individual Acknowledge is used, the tone-alert “re-sounds” when the condition clears. The cTBL ACK> key
must be pressed
twice
(once to change from Alarm Summary to actual point, and once to acknowledge the
condition). After a delay, the system alphanumeric display should indicate a normal system.
GLOBAL ACKNOWLEDGE PANEL OPERATION DURING TROUBLE CONDITIONS
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‘TROUBLE’”
Press (ACK) to review.
ALARMS = 0
SUPERVISORY = 0
TROUBLE = 1
SYSTEM
SUPERVISORY SYSTEM
POWER
0 0
ALARM
SERVICE
- ACKNOWLEDGE
ALPHANUMERIC
DISPLAY
YELLOW
LED (FLASHING)
ACKNOWLEDGE
KEY
Figure 3
Operator Interface Panel Showing Trouble Condition
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