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Step 9: Integrate the System 33
Step 9
Isolated control unit, single power supply
If you have two control units, we recommend that you connect one to
each SeaTalk terminal. In the following illustration:
• the course computer provides power to the SeaTalk system
• one control unit is connected on its own to SeaTalk A so it is
isolated against any possible failure of SeaTalk B
If the SeaTalk B line fails, the isolated control unit will switch to
Standby mode as a safety measure. By pressing
auto on the isolated
control unit you can regain full autopilot control.
* Note: Depending on the number of SeaTalk units and the total length of SeaTalk
cabling, you may need to provide power supply to each end of the SeaTalk bus
(‘ring-main’ style). Refer to the instrument handbook for more information.
Control unit
D5391-2
ST60
instruments
Single control unit, single power supply
SeaTalk bus
SeaTalk A
Extra connection on larger SeaTalk systems*
Course computer
power supply
(via breaker/fuse)
Isolated control unit, single power supply
Second
control unit
Isolated
control unit
D5392-2
ST60
instruments
SeaTalk B
SeaTalk A
SeaTalk bus
Extra connection on larger SeaTalk systems*
Course computer
power supply
(via breaker/fuse)
81173_3.book Page 33 Thursday, June 7, 2001 11:51 AM