NorthStar NS 3100 User Manual page 13

Transducers
1 If the NS3100 DEPTH does not come with a
transducer, choose a suitable transducer (see
section 5-3). If the NS3100 DEPTH is supplied with
a transducer, see section 5-3 to ensure that it is
suitable.
2 Choose a suitable location for the transducer
and install it by following the instructions in the
Transducer Installation manual.
3 Fit the cables between the transducer and the
display unit:
Keep the cable away from other cables, engines,
fluorescent lights, power inverters and radio or
radar transmitters.
Ensure no connectors lay in the bilge.
If necessary, extend the cable by adding extension
cables.
Do not cut the cable on any depth transducer.
Secure the cable at regular intervals.
4 Connect the transducer to the display unit
connector.
or connectors to protect them from water and
keep them from shorting together.
12
Warning; Tape or cover any unused wires
Power/data wiring
1 Wire the display unit power/data cable:
The unit requires 12 V DC power. Fit a power
switch and fuse to the power supply or power
the unit from a fused auxiliary switch. The fuse
should be 1 A for up to five instruments.
If the external beepers and lights require more
than 250 mA DC total, fit a relay.
A single unit can be wired as shown below:
Black
Switch
Depth transducer Red
Green
Yellow
No connection
White
NMEA out (optional)
Orange
}
Blue NavBus (optional)
With several instruments, use the optional junction
boxes to simplify wiring, as shown below:
Group 1
Junction box
Power & data
connections
Power/data cables
Group 2
NavBus cable
Power/data cable
For information on how to connect NavBus and to use
junction boxes, refer to the NavBus Installation and
Operation manual.
12 V DC power
Fuse
External beepers or
lights (optional)
Junction box
Power & data
connections
Northstar NS3100 DEPTH