Simrad AP21 and AP22 Autopilots
58 20220596G
4.8 Cable connections
Use only shielded cables. This includes Mains input, drive units
and if necessary for the extension of the RF300 Rudder Feedback
cable. The clutch/bypass cable and the solenoid cable should be
1,5 mm
2
(AWG14). Signal cables should be 0.5 mm
2
(AWG20)
twisted pairs.
The mains supply cable and the drive unit motor cable should
have sufficient wire gauge. This will minimize voltage drop and
allow the drive unit to operate at full power.
Refer to the table below for recommended cable sizes.
Cable length Drive Unit Voltage
1. Breaker panel to Junction Unit. 12V 24V
2. Junction Unit to Drive Unit motor
(Length refers to each of the two cables)
AWG
mm
2
AWG
mm
2
Up to 3 m (10 ft.) 12 2,5 12 2,5
Up to 6 m ( (20 ft.) 10 4 10 2,5
Up to 10 m (32 ft.) 8 6 10 4
Up to 16 m (52 ft.) 6 10 8 6
4.9 Grounding and RFI
The autopilot system has excellent RFI protection and all units
use the Junction Unit as a common ground/shield connection.
The Junction Unit should therefore have a proper ground
connection to the hull/bonding system.
ROBNET cables and other signal cables (compass, feedback,
NMEA) should not be run in parallel with other cables carrying
RF or high current, such as VHF and SSB transmitters, battery
chargers/ generators, winches and thrusters.
Remove the bottom cover to get access to the plug-in terminals.
Strip about 1 cm (0.4") of the cable's insulation and pull the
screen backwards to cover the insulation. Position the straps as
shown and tighten well to make sure the screen has good contact.
Provide sufficient wire length so that the plug-in terminals can be
easily connected/disconnected.
Pull out each terminal before connecting the wires. Remove all
strands before putting on the terminal cover.
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