Robertson AP21 and AP22 Autopilots
18 20220596E
2.3 AP21 and AP22 with MSD50 Stern Drive unit
Note ! The information in this paragraph only applies if your autopilot is
driving a Robertson MSD50 Stern Drive.
The MSD50 Stern drive unit has a relative feedback signal which
needs a zero point setting after the autopilot has been turned on.
Refer to paragraph 1.1 of the MSD50 manual for further
information.
Zero point setting
Note ! If you not need a rudder angle display when leaving the dock, just steer
the boat manually on a straight course and press the AUTO button.
The zero point is then set automatically.
If you prefer to use the rudder angle display when leaving the
dock, proceed as follows:
After turn on the rudder angle display will alternate between 10°
port and 10° starboard to indicate that the "rudder" zero point
need be set.
RFC
P
S
10
Use the wheel to bring the "rudder" to midship position. Turn the
wheel from lock to lock (H.O. to H.O.) and count the exact
number of turns. Then start from one lock position and turn the
half number of turns.
Press AUTO and then STBY. The zero point is now set and the
display will show:
RFC
PS
00
Operation
Follow the operating instructions on the following pages. There is
no further need for zero point setting until next time you turn the
autopilot on.
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