Power Supply Connections - Raytheon ST60 Owner's Handbook Manual

Chapter 3: Installation

Power supply connections

CAUTION
When instruments are connected to SeaTalk, ensure that the
power supply for the SeaTalk 12 V line is protected by a 5 A fuse.
Systems with a large number of instruments on the SeaTalk bus may
require connections to the power supply from each end of the system
('ring-main' style), to maintain sufficient voltage throughout the
system.
This requirement depends on the total length of the cable run and the
total number of instruments in the system, as follows:
Cable run
Up to 10 m
Up to 20 m
No. of instruments
13 maximum
26 maximum
7 maximum
13 maximum
Red
5 A fused,
12 V dc supply
(typically provided
by autopilot)
Screen
Red
Screen
SeaTalk power connections
Power connections
1
2
1
2
1 2
20
19
3 4
Instruments
5 to 16
17
18
D4311-1
23