25. ALERT MANAGEMENT SYSTEM (option)
25-9
25.8 Change of Priority for Unacknowledged Warning
IMO MSC302(87) requires that a Warning be changed to an Alarm if it is not acknowl-
edged within 60 seconds*. For how to change priority, see section 23.5.
*60 seconds is the standard timeout. Actual timeout is set with the ALF sentence.
25.9 How to Temporarily Silence the Buzzer
The sensors and external equipment are compliant with MSC302(87), which has a
provision to allow the temporary silencing of the buzzer for 30 seconds against any
alert, from the equipment that generated the alert or from the AMS. The buzzer again
sounds after 30 seconds if the alert is not acknowledged.
In this equipment, the [Silence] button, which is provided on the [ACTIVE ALERT] win-
dow, temporarily silences the buzzer. The [Silence] button also postpones the transfer
of an alert to the BNWAS, but only once. All further operations of the [Silence] button
will silence the alert, but will not postpone the transfer any further.
For the category C alert, the temporary silence interval can be as much as five min-
utes, depending on vessel tonnage.
25.10 Buzzer Patterns
The AMS has two buzzer patterns, legacy and IEC 62288 Ed.2, and one is chosen at
installation.
Legacy buzzer pattern
This buzzer sounds continuously until an emergency/alarm or warning is acknowl-
edged.
60 seconds
Not acknowledged
A Warning
is generated.
The Warning becomes an Alarm and
is then transferred to the BNWAS.
Acknowledge
Acknowledge
The buzzer sounds continuously.
Emergency/Alarm or
Warning generated
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