Garmin GHP 20 Marine Autopilot System for Steer-by-Wire, Installation Instructions Manual

Page: 12 / 257

Installing the Shadow Drive
Connecting the Shadow Drive to the Hydraulic System
Before you can install the Shadow Drive, you must select a
location at which to connect the Shadow Drive to the hydraulic
steering of your boat, after you have read and followed the
mounting and connection considerations ( page 3 ).
For further assistance, consult the hydraulic-layout diagrams
( page 6 ).
Use the included connectors to install the Shadow Drive in
the appropriate hydraulic line.
Connecting the Shadow Drive to the CCU
1
Route the bare-wire end of the CCU cable to the Shadow
Drive.
If the cable is not long enough, extend the appropriate wires
with 28 AWG (0.08 mm²) wire.
2
Connect the cables, based on this table.
Shadow Drive Wire Color CCU Cable Wire Color
Red (+) Brown (+)
Black (-) Black (-)
3
Solder and cover all bare-wire connections.
About NMEA 2000 and the Autopilot Components
NOTICE
If you have an existing NMEA 2000 network on your boat, it
should already be connected to power. Do not connect the
included NMEA 2000 power cable to an existing NMEA 2000
network, because only one power source should be connected
to a NMEA 2000 network.
You can connect the helm control and the CCU through an
existing NMEA 2000 network. If you do not have an existing
NMEA 2000 network on your boat, all the parts needed to build
one are supplied in the autopilot package ( page 12 ).
To use advanced features of the autopilot, optional NMEA
2000-compatible devices, such as a GPS device, can be
connected to the NMEA 2000 network.
For more information on NMEA 2000, go to
www.garmin.com .
Building a Basic NMEA 2000 Network for the Autopilot
System
NOTICE
You must connect the included NMEA 2000 power cable to the
boat ignition switch, or through another in-line switch. NMEA
2000 devices will drain your battery if the NMEA 2000 power
cable is connected to the battery directly.
1 Connect the three T-connectors
À
together by their sides.
+
-
2
Connect the included NMEA 2000 power cable
Á
to a 12
Vdc power source
Â
through a switch.
Connect the power cable to the ignition switch
Ã
of the boat
if possible, or route it through an inline switch (not included).
3
Connect the NMEA 2000 power cable to one of the T-
connectors.
4
Connect one of the included NMEA 2000 drop cables
Ä
to
one of the T-connectors and to the helm control
Å
.
5
Connect the other included NMEA 2000 drop cable to the
other T-connector and to the CCU
Æ
.
6
Connect the male and female terminators
Ç
to each end of
the combined T-connectors.
Connecting the Helm Control to the Existing NMEA 2000
Network
1
Determine where to connect the helm control
À
to your
existing NMEA 2000 backbone
Á
.
2
Disconnect one side of a NMEA 2000 T-connector
Â
from
the network.
3
If necessary, to extend the NMEA 2000 network backbone,
connect a NMEA 2000 backbone extension cable (not
included) to the side of the disconnected T-connector.
4
Add the included T
‑
connector for the helm control to the
NMEA 2000 backbone by connecting it to the side of the
disconnected T
‑
connector or backbone extension cable.
5
Route the included drop cable
Ã
to the helm control and to
the bottom of the T-connector added in step 4.
If the included drop cable is not long enough, you can use a
drop cable up to 20 ft. (6 m) long (not included).
6
Connect the drop cable to the helm control and the T-
connector.
Connecting the CCU to the Existing NMEA 2000 Network
1
Determine where to connect the CCU
À
to your existing
NMEA 2000 backbone
Á
.
12