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Installation
Along with data port connections the junction box also provides connections to the AIS transceiver alarm relay
contacts. The common and normally open alarm contacts are duplicates of the alarm relay connections
available at the power connector (see Table 5) whilst the normally closed contact is only provided at the junction
box. The alarm relay connections are described in Table 5. Use the alarm connections appropriate to the
vessels alarm system.
Junction box alarm
connection
COM
NC
NO
Table 5
Alarm relay connections
4.4.5
Power and alarm connections
Power is connected to the transceiver via the supplied four way power and alarm cable as shown in Figure 47.
Figure 47 Power connection
The power and alarm cable contains four wires which should be connected according to Table 6.
Wire colour
Brown
Black
White
Blue
Table 6
Power supply connections
*Connection to an emergency power source is an IMO requirement for SOLAS vessels.
The power supply current ratings and recommended fusing or circuit breaker currents are as follows:
● A 12VDC supply should be able to provide 4.0A and be fused at 8.0A.
● A 24VDC supply should be able to provide 2.0A and should be fused at 4.0A.
Page 44
Function
Alarm relay common connection
Alarm relay normally closed connection
Alarm relay normally open connection
Power connection
Function
Power supply +
Power supply -
Alarm relay normally open contact
Alarm relay common contact
Contact rating
220V or 2A or 60W
maximum
Connect to
12V or 24V DC power supply from
ships emergency power source*
Power supply ground
Bridge alarm system
Bridge alarm system
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