Raymarine 150/400 manual Separate course computer and instrument power, Typical larger boat system

34 Type 150/400 Autopilot System: Installation Guide

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)

Separate course computer and instrument power supplies

		Course computer
		power supply
		(via breaker/fuse)
SeaTalkA	SeaTalkB	instruments
		ST60
Control unit		Instrument SeaTalk bus

Red*

Screen Yellow

*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.

12 V power supply for Instrument SeaTalk bus (via breaker/fuse)

D5393-2

Step 9

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)