3. Read the alphanumeric display. Then, investigate the trouble to determine its cause. Restore or replace the
defective device (switch, wire, notification appliance, etc.) in accordance with device instructions.
NOTE:
When the trouble clears, the trouble LED flashes and the tone-alert sounds steady.
4. Press the <TBL ACK> key under the flashing SYSTEM TROUBLE LED. The alphanumeric display shows
the system status.
5. Press the cTBL ACK> key under the yellow SYSTEM TROUBLE LED again. After a delay, the
alphanumeric display should show the following message.
SYSTEM IS NORMAL
8:41:43 MON 7 DEC 92
ESSENTIAL TROUBLE CONDITION KEYS
The essential keys for trouble conditions are the Trouble Acknowledge cTBL ACK> and the <SYSTEM RESET>
keys. The remaining keys are concealed by the access door and are associated with advanced functions of the
system (see Section 9, Advanced Functions). Use of these keys require advanced user skills. These keys may be
passcode protected. See Operator Access Levels (Section 9) and Log In Procedure (Section 1).
TROUBLE ACKNOWLEDGE KEY
The cTBL ACK> key is used to scroll through the various displays on the alphanumeric display. It also controls the
Trouble LEDs and the tone-alert. The cTBL ACK> key is located directly under the SYSTEM TROUBLE LED.
Pressing the cTBL ACK> key (twice for Individual Acknowledge or once for Global acknowledge) causes the LED
to change from flashing ON to steady ON, silences the tone-alert, and causes the following to occur:
l
Selects the next unacknowledged trouble point and displays it on the alphanumeric display (Individual
Acknowledge)
l
Acknowledges the displayed point or acknowledges all points on the list (Global Acknowledge)
l
Silences signals programmed to follow the Trouble Acknowledge key
l
Scrolls the points chronologically after all have been acknowledged.
If the cTBL ACK> key is passcode protected, you cannot use this key to acknowledge troubles unless you have the
required access level. See Operator Access Levels (Section 9) and Log In Procedure (Section 1).
There are two types of acknowledges for the NDU: Global Acknowledge and Individual Acknowledge. Each
acknowledge type operates with the System Trouble Condition in the following manner.
l Global Acknowledge -
When Global Acknowledge is used, a single key press of the cTBL ACK> key
acknowledges all troubles in the system. If status change information is required, you may review this data
(after a 60 second delay) by pressing the cTBL ACK> key and reading the total number of, troubles on the
alphanumeric display.
l Individual Acknowledge
(For NFPA 72-l 990 Requirements) -
If a trouble condition has been
acknowledged with the cTBL ACK> key and further unacknowledged conditions remain in the system, the
tone-alert continues to sound and the next status change is shown on the alphanumeric display. This process
repeats until all changes are acknowledged. When this occurs, the tone-alert is silenced.
17
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