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WATCH ALARM Operation
1．Operation sequence of displays and alarms
At the end of a dormant period, the WATCH ALARM initiates in order of visual indication, first stage
bridge audible alarm, second stage remote audible alarm, and third stage remote audible alarm. The
alarm continues until it is reset.
Visual indication
First stage bridge
audible alarm
Second stage remote
audible alarm
Third stage remote
audible alarm
3rd stage remote
audible alarm
2nd stage remote
audible alarm
1st stage bridge
audible alarm
Visual indication
2. Component operations at respective stages
Bridge
(NWZ-4650 display unit)
Bridge
(NCD-2257 Warning lamp unit)
Bridge
(NCJ-895/896 Reset button
unit)
Backup officer
(NVS-785 Buzzer unit)
Officer
(NVS-785 Buzzer unit)
Public room
(NVS-785 Buzzer unit)
At the end of a dormant period, a visual indication initiates on the
bridge.
The visual indication is the form of a blinking display.
If not reset in 15 sec after the visual indication is initiated, it is the
audible alarm initiated in a bridge.
If not reset in 15 sec after the first stage bridge audible alarm is
initiated, it is the audible alarm initiated in the remote place of a backup
officer's and/or a Master's location.
If not reset in 90 sec (change in 0 or 90 sec to 180 sec is possible) after
the second stage remote audible alarm is initiated, it is the audible
alarm initiated in the location of further crew.
Td=Selected dormant period
Alarm sequence and indication without acknowledgements
Normal
Visual
state
indication
Illuminated
Blinking
-
Blinking
Illuminated
Blinking
-
-
-
-iv -
The first
The second
stage bridge
stage remote
audible
alarm
Blinking
Blinking
Blinking /
Sounding
-
-
-
-
-
-
(minutes)
The third
stage remote
audible
audible
alarm
alarm
Blinking
Blinking
Blinking
Blinking
Blinking /
Blinking /
Sounding
Sounding
Sounding
Sounding
-
Sounding
-
Sounding
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