Operating manual ALPHASEAPILOT MFC Issue 1.1 Page 59 of 84
ALPHASEAPILOT MFC
2.31 Setting the Rudder Limit Control
The Rudder Limit Control defines the maximum angle of rudder that the Autopilot is able to
apply with the exception of Counter Rudder, which overrides the Rudder Limit setting.
NB. This results in a safe operating mode wherein rudder angle is limited for any angle of
course change ordered to a new heading and for any angle of rudder ordered by the
Autotrim process (APH). However, high rates of departure from the course steered will
continue to attract large angles of ‘check’ rudder that might be necessary to quickly
arrest the vessel in a potential broach condition etc.
The Rudder Limit control can be set from 5° to 50° in 5° steps or switched OFF via the LIMITS
Menu.
When the limit of prescribed angle is reached, single bleep and a flashing RUDDER LIMIT
message appears in the Alarm box (bottom left of Control Unit main display).
As a general rule, the Rudder Limit control should be set to limit the angle of rudder
applied such that any angle of course change ordered can be safely executed within
the turning capability of the vessel and it’s operational considerations (warp tensions
if towing etc.)
NB. If Track Steering mode is operational using the HTC sentence, it is possible for
the Track Control system to override the Rudder limit value set within the
Autopilot LIMITS Menu.
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