88 ST4000 Plus Wheel & Tiller Autopilots Owner’s Handbook
this will not damage the equipment but can lead to it resetting, or
momentarily may result in faulty operation.
Overview
Having checked that the system is functioning correctly, a short sea trial
is now required to complete the setup. It involves the following
procedures:
ïAutomatic compass deviation correction
ïHeading alignment adjustment
ïAutopilot operation check
ïRudder gain adjustment
Note: The ST4000 Plus has a built-in calibration capability which
enables it to be fine tuned to suit the individual vessel, its steering
system and dynamic steering characteristics. As supplied from the
factory the unit is calibrated to provide safe stable autopilot control for
the majority of vessels.
The initial sea trial should be performed in the following
circumstances:
ïAfter all the installation, functional test and dockside procedures
have been completed successfully
ïBefore any other changes have been made to the default calibration
settings: check and, if necessary, reset the values to the
recommended levels, as described in Chapter 5
ïIn conditions of light wind and calm water, so that autopilot
performance can be assessed without the influence of strong winds
or large waves
ïIn waters clear of any obstructions
Note: At any time during the sea trial you can disengage the wheel
drive clutch, or lift the actuator off the tiller pin, to return to hand
steering.
Aut omatic compass deviat ion correct ion
The ST4000 Plus will correct the fluxgate compass for most deviating
magnetic fields. Compass errors due to deviating magnetic fields can
be in the up to 15∞ or even 45∞, depending on your vessel type. The
correction procedure reduces these to a few degrees, so it is essential to
perform the procedure as the first item in your initial sea trial.
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