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Wiring the 490
Electrical power
requirements
Connecting the 490 to ship's
490 INSTALLATION MANUAL, Revision B2
CAUTION!
The majority of installation problems are caused by shortcuts
taken with system cables. When installing the 490, be sure that
you:
•
assemble connectors carefully
•
don't make sharp bends in the cables
•
leave service and drip loops, so that moisture won't run
down the cables and into the 490 or the 961/962 or 957/
958
•
tie-wrap all cables to keep them secure
•
if cables are shortened, lengthened (not recommended), or
re-terminated, seal all wiring splices
•
prevent interference from the transducer cable
The 490 is a negative-ground system that is reverse-polarity
and overvoltage protected. The unit requires 10 to 30 VDC
power at 8 Watts.
The connection between ship's power and the 490 requires the
power
10-foot (3-meter) power cable supplied by Northstar.
The wires in the power cable must be connected as follows
(black and white can be connected together at the power
source):
Red → Positive (+) (fused lead)
•
Black → Negative (–)
•
Green → Ground (earth)
•
NOTE:
SECTION THREE Installing the 490
Make sure that fuse or circuit-breaker protection is
provided at the power source.
The 490 should be grounded to the vessel to
eliminate interference. Secure either the green wire
or a ground wire from the 490's grounding terminal
(on the far right side of the unit) to the vessel's
nearest
grounding
point.
grounding, performance may be degraded.
Without
an
earth
Page 17
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