Chapter 2: Installation Procedures 6-2-27
ST290 Instrument System Owner’s Handbook
Unused connectors
Insert the blanking plugs supplied, into any unused SeaTALK
2
connectors on the instruments, keypads and junction blocks.
2.8 Making power connections
Requirements
CAUTION:
Incorrectly connected power supplies could cause damage to the
system. Ensure you do NOT deviate from the procedures in this
handbook, when connecting power.
The ST290 system requires a 12 V dc supply. Power can be supplied
either from a separate 12 V dc source (preferably from a 12 V battery) or,
from SeaTalk.In either case,the power source forthe ST290 system must
be protected by a 5 A fuse or circuit breaker.
If your vessel only has a 24 V supply, a suitable down-converter must be
used to provide 12 V.
Power for the system is connected to the DPU then distributed from there
to the rest of the system via the SeaTalk and SeaTALK
2
buses.
Power supply capacity
The power supply information given here is valid for a typical ST290
system where the total of the LENs for all products on SeaTALK
2
is 100
or less (see Section 6, Chapter 1). If you are installing a large system
where the total of the LENs is in excess of 100, please contact the
Raymarine Technical Support Department, or your local Raymarine
Dealer for advice on power supply connection.
Grounding the system
In order to meet the system EMC specification:
• The SeaTALK
2
cable screen must be connected to the vessel’sRF
ground point.
• The 12 V supply must remain floating. DO NOT connect any part of
the 12 V supply to a ground point.
81183_2 S6.book Page 27 Wednesday, May 7, 2003 11:27 AM
To Next Page
Loading...
