Installation
Page 45
The power and alarm cable contains four wires which should be connected according to Table 6.
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.
The alarm relay is rated to 220VDC or 2ADC or 60W maximum. The alarm connections provided at the power
connections are a duplicate of the those available via the junction box and described in section 4.4.
4.4.6
Grounding the transceiver
The transceiver is fully isolated from the vessels power supply by its internal power supply circuit. If a ground
connection is required for the shield of data connections then a connection must be made to the vessels
electrical ground. A grounding stud is provided on the rear of the transceiver chassis for this purpose as
indicated in Figure 49. Two M4 nuts and a shake proof washer are provided with the product fixings. A
grounding cable terminated in a suitable ring crimp should be clamped to the earth stud using the fixings
provided.
Figure 49 Grounding the transceiver
Wire colour
Function
Connect to
Brown
Power
12V or 24V DC power supply from
ships emergency power source*
Black
Power supply -
Power supply ground
White
Alarm relay normally open contact
Bridge alarm system
Blue
Alarm relay common contact
Bridge alarm system
Ground stud