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Robertson AP9 Mk3 Autopilot
Magnetic Compass (CD109) adjustments
The CD109 Course Detector is normally mounted underneath the
magnetic compass.
To check and calibrate the course detector, do as follows:
The display will now show what type of compass is selected as Main
Compass.
Loosen the fixing screw and turn the CD109 until the correct heading
appear in the Heading Display. Use a screw driver or similar to
deflect the compass to different headings and verify that the CD109
will read the correct heading. Some minor deviation may occur. Turn
the Course Detector slightly to divide the error.
If the readout of the heading is erratic or does not show the correct heading,
Note !
enter the Debug Mode and check if the sine/cosine voltage are normal,
eventually increase or decrease the distance between the compass card and
the Course Detector.
The sine/cosine voltage swing should be appr. 2.5±2V.
Inverted compass readout (CD109 top mounting)
On some installations it may be necessary to mount the CD109
Compass Detector on top of the magnetic compass. To obtain correct
readout, the SINE and COSINE signals must be interchanged. This is
normally done in the connector.
Fluxgate compass / RGC gyrocompass sine/cosine
The RFC35NS Fluxgate Compass provides sine/cosine (2.5±2V)
signal to the autopilot. Also the RGC Interface Unit provides
sin/cosine signal and must then be connected as "fluxgate input" to
J5.
A. Fluxgate alignment (RFC35NS)
Calibrate the compass prior to final alignment, ref. page 5-64
Note !
Select Fluxgate as Main Compass by "COMPASS SELECT". Turn the
Fluxgate compass for correct heading.
Make sure that the "FLUXGATE OFFSET" parameter is set to 0 (zero). Ref
Note !
Fig. 5-40, page 5-39. This offset is only present when Fluxgate compass is
selected.
5-60
• Make sure that the CD109 is connected.
• Select HELMSMAN mode
• Press "COMPASS SELECT"
• Press one more time on the COMPASS SELECT. The
display will now show the magnetic course from the
CD109.
20169223D
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