Seiwa SW AP03 - Manual (Page 25)

MENU 2
RUDDER LIMITS This setting controls the maximum rudder angle used when the
system is in PILOT mode. It is preset to 20 degrees and may be
changed using the arrow keys. It should always be less than the
mechanical limits stored during the System Setup procedure.
The Helm Damping control compensates for inertia or overshoot in
the steering drive, which may be present in most hydraulic or
electrical systems. To check the suitability of the preset value of 2,
turn the helm manually to about 20 deg. rudder angle and press
PILOT to centre the helm. Observe the rudder movement. If the
rudder stops short and then "inches" into the centre position,
reduce the damping factor. If it overshoots and "inches" back,
increase the damping factor.
The deadband acts as a filter which prevents the steering drive
from pulsing on and off in response to very small error signals. If it
is set too high, the steering will be slow to respond to small
corrections. The best setting is one just above the value which
produces continuous pulsing of the steering gear.
The RATE FACTOR controls the amount of counter rudder applied
in all control modes. Guidelines for setting it are given in Sect 2.7.
As a safety feature, a HELM ALERT alarm is activated at regular
intervals when the system is in the PILOT mode. The time interval
may be set to 5, 10 or 15 minutes or the alert may be switched off.
TACK ANGLE In auto-tack mode, the angle through which the vessel turns
May be set in 5 degree steps from 20 to 160 degrees.
A magnetic variation value must be entered if GPS sentences
containing TRUE headings are used. The variation is displayed on
a 360 degree scale, i.e. 13 degrees east appears as 013, while 10
degrees west appears as 350. Use the COURSE keys to adjust
the variation.
23
AUTOTRIM The autotrim continuously adjusts the helm centre by averaging the course
errors over time. It may be switched off (0) or on (1).
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HELM
DAMPING
HELM
ALERT
RATE
FACTOR
ADJUST
VARIATION
HELM
DEADBAND