Seiwa SW AP01 - Manual (Page 28)

OVERLOAD The current drawn by the steering gear has exceeded the limits and
the drive has been turned off. See Chap. 4 for further information.
STALL If the steering drive is activated and the helm moves less than 1 degree in 2.5
seconds, the system is switched to STANDBY and this alarm is set.
Either the rudder has travelled past the limits set during System
Setup or an electrical fault has developed in the Rudder
Transducer. The system switches to STANDBY.
COMPASS If a fluxgate compass has been selected, the magnetic field being
sensed by the compass is above or below preset limits. Further
information is given in Chap. 4.
HEADING DATA If a digital heading input has been selected, a valid heading
sentence is not being received.
NO DATA This alarm is generated by the Controller to indicate that no data is being
received from the Junction Box. This can indicate either a fault in
the Controller cable or a failure within the Junction Box.
2.7 RECOMMENDED SETTINGS
As previously stated, in the auto-tune mode, internal settings are preset during the setup
procedure and are then adjusted automatically while under way. There may be cases
where you wish to change these presets via the menu, but generally the guidelines below
are for use in the manual modes.
The Rudder Factor is set according to the responsiveness of the steering. Yachts and
power boats from 6 to 15 m in length, generally have responsive steering and a rudder
factor setting of 3 or 4 is suitable. For high speed planing hulls, a setting of 2 to 3 should
give better control. Vessels above 15 m length normally have less responsive steering
and a good rudder factor setting is in the range 5 to 7.
A rudder factor of 4 applies 0.5 degree of helm for each degree off course.
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Autotrim is normally turned on.
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