Raymarine ST7000, Руководство по установке

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5.6 Rudder Gain Adjustment
(High Speed Planing Craft)
It is particularly important that the Rudder Gain is
correctly set on high speed craft. Incorrect
adjustment will lead to poor steering performance
and is a dangerous condition at high speed.
Adjust as follows:
Optimum Setting
•
Set to Rudder Gain for optimum steering
performance at the vessels normal cruising
speed.
•
Push and hold down both Response keys
together for 1 second to gain access to
Rudder Gain, Adjust either side of the
calibrated setting to provide optimum autopilot
steering.
Auto Adapt
It is recommended that for high speed craft the
Auto Adapt facility is selected. This automatically
reduces the effects of Northerly/Southerly heading
instability.
This feature is selected in calibration by entering
the vessel's operating latitude (see 4.3). When
selected it automatically adjusts the Rudder Gain
depending on heading removing the need for
manual adjustment.
Warning: If Auto Adapt is not selected manual
adjustment of rudder gain is normally required
when going from Northerly to Southerly headings
or vice versa. Failure to do so can lead to poor
course keeping.
Adjustment with Speed
•
Due to the significant differences in dynamic
stability between planing and non-planing
conditions most high speed craft require
Rudder Gain adjustment when going from
planing to displacement speeds or vice versa.
The required adjustment can be achieved
automatically or manually.
•
When the ST7000 is used with the speed
input from an Autohelm ST50 SPEED or
TRIDATA instrument the Rudder Gain is
automatically adjusted with boat speed. After
setting the gain at planing speed no further
manual adjustment should be required.
•
If no ST50 speed input is available manual
adjustment should be carried out to the
Rudder Gain setting via the
Response keys
(see 'optimum setting') adjusting as follows:
•
Speed decreases from planing to
displacement
- increase gain by 1 or 2 levels.
•
Speed increases from displacement to
planing
- decrease gain by 1 or 2 levels.
Warning: The manual gain adjustment must be
made after reducing from planing to displacement
speed and before increasing from displacement
to planing speed.
5.7 Manual Override
(Sterndrive Actuators only)
Manual override is selected during calibration
using the
Auto Release option. It must only be
used on installations fitted with the stern drive
actuator. When it has been selected, the ST7000
can be overridden to allow hand steering by
turning the steering wheel. This will return the
ST7000 to
Standby and sound the control unit
buzzer for 10 seconds. There is a slight delay
before the ST7000 will return to
Standby.
Excessive force is not required and will not
reduce this delay.
With the ST7000 in Auto and clear of obstruction
turn the steering wheel to observe the manual
override. Repeat two or three times until you are
confident with its operation.
The manual override is intended for
emergency use only. The ST7000 should
normally be disengaged by pushing the
Standby button on the control unit.
5.8 Rate Gain Adjustment
(Counter Rudder)
Counter rudder increases the natural yaw
damping of the vessel and at the expense of
increased autopilot activity, will generally provide
improved course keeping accuracy.
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