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Rudder Angle Sensor
Installation
Standard version for mounting on
the cylinder piston rod
ATTENTION: The hook length must be
adjusted so as not to interfere with the cylin-
der, when the piston is fully retracted!
To adjust the hook length, proceed as fol-
lows:
1. Remove the lid on top of the Sensor
2. Unscrew the hook
3. Adjust the hook length and tighten the
hook screws
4. Close the lid
The hook must be bent so as to guarantee
a firm grip of the piston rod, even when it is
moving vertically! There must be absolutely
no play.
WARNING: make sure the hook does not
interfere with the rudder arm at full rudder
deflection!!!
The sensor is supplied with a hook. The
hook is properly bent for a piston rod of 16
mm (5/8") diameter.
A hole (6,5 mm / 2/8" diameter and 10 mm
/ 3/8" deep) should be drilled along the axis of
the bolt. A second hole with a 3 mm (1/8")
thread is required to fix the shaft of the poten-
tiometer in the bolt. For different conditions,
the wire hook may be bent as required.
If the linear drive unit has been supplied by
TECNAUTIC, the bolt with properly drilled
holes is provided by the factory.
The rudder angle
sensor must pick up
the rudder move-
ment without any
play.
Piston Rod of hy-
draulic cylinder
Checking the Sensor after the in-
stallation and setup procedure has
been completed
Do not proceed with this test before com-
pleting the initial installation and setup (p.22)!
Switch on the SERVO mode, if an
electronic steering wheel is installed and turn
the wheel to the middle position.
Or, if there is no electronic steering wheel
available, have the boat moored firmly, so as
not to change its heading. Place the rudder
amidships and engage the autopilot HDG
mode. Verify the displayed heading to be sta-
ble, before engaging the autopilot.
The rudder should be steady at this stage.
Now try to apply very light sideways force
with your finger tip onto the hook of the rudder
angle sensor. If there is play, the rudder will
move. Eliminate the play!
Play leads to rudder oscillations and inac-
curate steering.
Conventional Rudder Sensor Instal-
lation
In case of an existing rudder actuator, it
might be easier, to install
the sensor in a con-
ventional way. Tecnau-
tic recommends its "sealed rudder
sensor" for that purpose.
There is no requirement on the orientation
of the sensor. The sensor arm A and the ef-
fective arm B at the rudder must be of equal
length however.
A
Make sure: A = B
B
Rudder Centered: