TMQ AP9 Autopilot (V6.0 - 965) Page 41 of 51 31/1/2017
Rudder Limit Adjustment
NOTE: THE RUDDER LIMITS ARE FACTORY SET TO APPROXIMATELY 30
DEGREES. IF THE RUDDER FEEDBACK HAS BEEN
INSTALLED CORRECTLY, THE P-L AND S-L SYMBOLS
SHOULD DISPLAY WHEN THE RUDDER IS MOVED PORT OR
STARBOARD BY 30 DEGREES.
Internal Rudder Limits
The rudder limits prevent the steering motor driving the rudder beyond its physical
(mechanical) stops. The limits are set so that the limit display comes on before the rudder
reaches the stops.
If the autopilot attempts to drive the rudder beyond its physical limits, the steering gear and
autopilot drive system may be damaged. A default limit is set when the autopilot is turned
on. This will give approximately 30º port and starboard movement before the rudder limits
operate. The external rudder limit control on the front panel can then be used to restrict
the rudder angle range even further and is intended to be used to prevent sharp turns, rather
than protect the autopilot system.
NOTE: If the rudder feedback unit has been installed correctly, it should not be
necessary to adjust the Rudder Limit Setting
There are two display symbols P_L (port limit), S_L (starboard limit) indicating the state
of the rudder limit circuits.
· The port limit P_L display will come on when the rudder position is further to
port than the limit set by the rudder limit port setting. This will cause any port
drive command to be ignored and turn off the port drive light on the front panel.
· The starboard limit S_L functions in the same way for rudder angles to starboard.
Setting/Resetting Rudder Limit
NOTE: Before resetting the rudder limits the Rudder Limit control on the front
panel MUST be set fully clockwise.
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