56 ST4000 Plus Wheel & Tiller Autopilots Owner’s Handbook
6.4 Rudder reference transducer
This section describes the installation of the Autohelm rudder reference
transducer (Catalogue No. Z131 ñ not supplied) with the ST4000 Plus
Wheel autopilot.
The use of this transducer is not mandatory; however, it does provide
the autopilot with accurate information on the position of the rudder.
Note: If you add a rudder reference transducer after the main
installation, you need to run the Dockside Rudder Calibration function
again so that the autopilot can determine the characteristics of your
system (see section 7.2).
Mounting position
ïMount the transducer on a suitable base adjacent to the rudder
stock, using the self tapping screws provided.
ïThe base height must ensure correct vertical alignment of the
transducer arm and tiller arm.
ïIf it is more convenient, the transducer may be mounted upside
down (logo downwards). The Dockside Rudder Calibration
procedure will automatically compensate for the mechanical
reversal.
ïThe transducer has a built in spring to remove any free play in the
linkage to the tiller. This gives very precise rudder position.
ïTransducer arm movement is limited to + /ñ 60∞.
ïCare must be taken during installation to ensure the transducer arm
is opposite the cable entry when the rudder is amidships. Failure to
position the arm correctly could result in damage if the arm is driven
onto its end stops by the steering system.
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