3
0736
Introduction
General Description
The GMDSS Distress Alarm Panel is used for remote initiation of distress alert transmissions
and visible and audible indication of incoming distress and urgency calls on VHF, MF/HF,
and Inmarsat-C. Normally it is installed on the bridge at the conning position.
The Alarm Panel contains three main sections, intended for connection to System 5000 VHF,
System 5000 MF/HF equipment, and Inmarsat-C SES equipment. All sections work inde-
pendently and all control signals are galvanically isolated by opto-couplers.
For Inmarsat-C and VHF, the Alarm Panel has duplicated connections allowing two units of
each system to be supported simultaneously. Each section includes a push button for
distress alert initiation, and a distress annunciator for indication of distress alert transmission
in progress or distress or urgency calls received. Additionally there is an annunciator for
indication of equipment type. This is switched on when the appropriate transceiver has been
sensed by the Alarm Panel.
If a distress alarm is initiated on a system with duplicated units, only one of the units will
send the alarm. The selected unit is indicated on the display.
To protect against inadvertent activation the distress buttons are protected by spring loaded
transparent covers. A button must be kept pressed for 5 seconds before the distress alert is
initiated, during which time the audible alarm is beeping and the distress button is flashing.
The Alarm Panel is supplied from 24 V DC supply voltage (21 V to 32 V). The input is
reverse polarity protected.
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