Raymarine ST4000 Plus, Руководство пользователя

Страница: 101 / 119

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:
ï Automatic compass deviation correction
ï Heading alignment adjustment
ï Autopilot operation check
ï Rudder 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:
ï After all the installation, functional test and dockside procedures
have been completed successfully
ï Before 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
ï In conditions of light wind and calm water, so that autopilot
performance can be assessed without the influence of strong winds
or large waves
ï In 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.
Automatic compass deviation correction
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.