NorthStar NS3100 Multi Instrument Reference Manual page 21

Side view of display unit mounting
Fixing hole
50 mm (2")
20
Transducers
1 If the NS3100 Multi does not come with
transducers, choose suitable transducers (see
section 9-3). If the NS3100 Multi is supplied
with transducers, see section 9-3 to ensure that
they are suitable.
2 Choose suitable locations for the transducers
and install them by following the instructions
in the Transducer Installation manual.
3 Fit the cables between the transducers and the
display unit:
Keep the cable away from other cables,
engines, fluorescent lights, power inverters and
radio or radar transmitters.
Do not lay the cable 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 transducers to the display unit
connectors.
Display
unit
Clearance 50 mm (2") minimum
Warning; Tape or cover any unused wires or
connectors to protect them from water and keep
them from shorting together.
Power/data wiring
Wire the display unit power/data cable:
A single unit can be wired as shown below:
20 mm (0.75")
With several instruments, use the optional
maximum thickness
junction boxes to simplify wiring, as shown below:
Fixing nut
For information on how to connect NavBus
and to use junction boxes, refer to the NavBus
Installation and Operation manual.
Cables
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.
Black
Switch
Fuse
Red
External beepers or
Green
lights (optional)
Yellow
NMEA in (GPS, optional)
NMEA out (optional)
White
Orange
}
NavBus (optional)
Blue
Depth transducer
Speed/temperature transducer
Group 1
Junction box
Power/data cables
NavBus cable
Group 2 Junction box
Power/data cable
Northstar NS3100 MULTI
-
12 V DC
power
+
Power & data
connections
Power & data con-
nections