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Garmin Nexus Owner's manual

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  • How do I connect the autopilot to the NX2 Network?
    How do I connect the autopilot in stand-alone mode?
    What is the maximum cable length that can be used for the rudder angle transmitter?
    How do I determine the correct wire thickness to use for the connections?
    How do I install the linear rudder angle transmitter?
English
AUTOPILOT
Connect 1&2
to bypass (16
& 17).
+12 V
Safety
switch
12/24 V
Compass Transducer
Linear rudder angle transmitter
NMEA OUT
NMEA IN
Integrated linear drive
Up = Pumpset
Down = Solenoid
Keep in down pos.
Silva NX2 Servo Unit
Green
Yellow
White
Screen
Screen
Green
Yellow
White
Red alt White
White alt Green alt Yellow
NMEA IN
When connecting to the
NX2 server (Network), do
not use the green wire.
Connect compass transcuer
to servo unit when Autopilot
is stand alone. Connect to
server when Autopilot is in
a NX2 network.
Rudder angle transmitter.
Colours are depending on
which transmitter is used.
NMEA IN
NMEA OUT
NMEA Return
NMEA OUT
NMEA Return
Black
Red
Black
Not Connected
Not Connected
Bypass
R
e
d
R
e
d
B
l
ac
k
B
l
ac
k
Battery connection
+12/24 V
Integrated linear drive
Not Connected
Not Connected
Not Connected
2
0
A
F
u
s
e
Autopilot connection in NX2 Network
See also power
connection
alternative on
next page
Silva NX2 Server
Connect 1&2
to bypass (16
& 17).
+12 V
Safety
switch
12/24 V
Compass Transducer
NX2 Autopilot
Linear rudder angle transmitter
NMEA OUT
NMEA IN
Integrated linear drive
Up = Pumpset
Down = Solenoid
Keep in down pos.
Silva NX2 Servo Unit
2
0
A
F
u
s
e
English
AUTOPILOT
Stand alone autopilot connection
Suggested power connection with separate ON/OFF for
autopilot (with relay)
Suggested power connection with separate ON/OFF for
autopilot (without relay)
Also see power
connection
alternative
below.
Power connection alternative
English
AUTOPILOT
Wire thickness
Important! Use the following tables to determine wire thickness from the
battery to the servo unit, from the servo unit to the pumpset, from the servo
unit to the bypass valve.
Connections to the NX2 instruments/server/transducers is made with Silva
Nexus cable (shielded).
If rudder angle transmitter cable needs to be extended this can be done
with standard 0,25 mm² cable.
8812 (40)
1067,5 (25)
1245 (16)
142,53 (10)
Wire size
(AWG)
Wire size
(mm²)
Cablelength
max m (ft)
Servo unit
and pumpset
0,75
Wire size (mm²)
Bypass valve
0,25
Wire size (mm²)
Rudder angle
transmitter
English
AUTOPILOT
Installation of the Linear Rudder Angle Transmitter
Included your linear rudder angle transmitter there are a number of resistors. Find out the length of the tiller
arm (page 8-52 in the NX2 Autopilot manual) or maximum rudder angle.
Each plastic bag containing the resistors is also marked with tiller arm length and max rudder angle. Please
choose the resistor that suits your boat.
If your steering system has a mechanical stop which not makes your linear pumpset able to reach its
maximum length, then you choose resistors after the length of the tiller arm and set the max rudder angle
manually in the Autopilot instrument (see page 26 in the Autopilot instrument manual).
When you know which resistors to use, you solder one resistor on the red cable, and one on the black cable
(see picture). After you have soldered the risistors isolate the wires carefully.
How to get correct value of the resistor to the linear rudder angle transmiter
In the table below you will find: which length of the tiller arm you can use, which maximum rudder angle you
will get, which exact value of the resistor it will be with the specific rudder angle, which value of the resistor
that is a standard resistor, which maximum rudder angle you will get if using a standard resistor value.
The rudder angle transducers impedance is 11,9 kΩ.
23,235225
22,136220
21,537215
21,038210
20,039205
19,140200
18,741195
17,842190
16,944185
16,545180
15,447175
14,749170
14,051165
13,053160
12,456155
11,359150
Resistor value
(kΩ)
Angle of RudderLength of Tiller
Arm (mm)
/