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34 Type 150/400 Autopilot System: Installation Guide
Step 9
Separate course computer and instrument power
Another option is to provide separate power supplies to the course
computer and SeaTalk system so you can have independent, switched
instrument and pilot systems.
On the illustrated example, the behavior of the control unit on
SeaTalk A depends on whether you connect the red SeaTalk wire to
the SeaTalk B terminal:
• if the red wire is not connected, the control unit does not power up
when the course computer power is off
• if the red wire is connected, the control unit shows a
PILOT OFF or
NO LINK message when the course computer power is off (as it will
still receive power from the SeaTalk B line)
Typical larger boat system
The following illustration shows a typical system layout for a
Type 150G or Type 400G course computer on a larger boat. It has:
• separate course computer and SeaTalk power supplies
• an isolated control unit on SeaTalk A
• a NMEA 1 output so the radar/chartplotters can use the fast
heading output from the course computer to enable MARPA
(see page 37)
Screen
Red*
Yellow
Separate course computer and instrument power supplies
Control unit
D5393-2
ST60
instruments
SeaTalk B
SeaTalk A
Instrument SeaTalk bus
Course computer
power supply
(via breaker/fuse)
12 V power supply
for Instrument
SeaTalk bus
(via breaker/fuse)
*Red wire not connected:
When course computer power supply is off,
control unit does not power up.
*Red wire connected:
When course computer power supply is off,
control unit shows 'PILOT OFF' or 'NO LINK'
message.
81173_3.book Page 34 Thursday, June 7, 2001 11:51 AM