4.3 Direct Power Connection
1
3 A circuit breaker or fuse
2
12 V dc vessel power supply
3
Vessel’s RF ground
4
SeaTalk
ng
power cable
4.4 SeaTalkng® power supply
Power is supplied to the product over the SeaTalkng®
backbone.
A SeaTalkng® backbone requires one 12 V dc power
supply, connected to the SeaTalkng® backbone.
This can be provided by:
• a battery
(1)
, via the distribution panel,
• an Autopilot Control Unit (ACU)
(2)
,
• an SPX course computer
(2)
,
• for 24 V vessels a 5 amp, regulated, continuous
24 V dc to 12 V dc converter is required.
Note:
• (1) The battery used for starting the vessel’s
engine(s) should NOT be used to power the
SeaTalkng® backbone as this can cause sudden
voltage drops, when the engines are started.
• (2) The ACU-100 and SPX-5 cannot be used to
power the SeaTalkng® backbone.
SeaTalkng® power connection point
Small systems
If the backbone length is 60 m (197 ft) or less, the
power connection point may be connected at any
point in the backbone.
Large systems
If the backbone length is greater than 60 m (197 ft),
the power connection point should be connected at
a point that creates a balanced current draw from
each side of the backbone. The Load Equivalency
Number (LEN) is used to determine the power
connection point for the system.
In the example above the system has an overall LEN
of 10, so the optimum connection point would be to
have 5 LEN either side of the connection point.
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