Raymarine GPS navigation GPS Receiver User Manual


 
2.3.1 Power Input
The NAV
398
is intended for use on vessels with 12 VDC power systems
and can operate as long as the DC supply is maintained between 10 and 16
volts. The DC power system can be “negative” ground or have both positive
and negative supply lines “floating” above ground. The
NAV 398 is
not
intended
for
use
on
11
pas
itiv,a”
pround
ve&
A 6 foot cable assembly containing wiring for the DC power and Data
Output is supplied with your display unit and in many cases will be adequate
to reach near the source of the 12 VDC power.
For best noise immunity
from other shipboard elec-
tronics, if possible, avoid
grouping the power connec-
tions on the same circuit
breaker with radar, radio, or
echo sounder power leads.
The NAV unit’s wiring
should be kept separate as
much as possible from other
devices.
FUSE RED
BROWN
DATA IN
+
DATA OUT+
DATA OUT-
-12VDC
+WD
C
DATA IN
-
Power Cable Wiring Diagram
Although the
NAV
unit’s power consumption is typically less than 5 watts,
if the power leads need to be extended more than 10 feet, the wire size of the
leads should be increased accordingly to minimize line losses. For cable runs
of 20
-
35 feet #12 AWG wire is recommended.
1
OBSERVE PROPER POLARITY!
1
The
RED
wire should be connected to
the POSITIVE (+)
sauce
terminal;
the BLACK wire should be connected to the NEGATIVE
(-)
source
terminal If the power leads are accidentally reversed, the in-line fuse will
blow. If this happens, recheck the polarity of the connections with a voltmeter
(VOM) and, if necessary, reverse the leads for proper connection. Replace
the fuse.
2.3.2 Sensor Connections
The sensor units used with the NAV 398 normally obtain their
12VDC
operating power input from the NAV unit and, when the NAV unit has been
turned ON, the sensors can then proceed to locate and track signals and
INSTALLATION 2-5