Simrad ROBERTSON AP45 - Manual (Page 100)

Page 7-4 Robertson AP45 Autopilot
Trouble shooting
Simrad Robertson AS
Egersund - Norway
G45 GYRO INTERFACE
Readjusting procedure of 2,5V reference voltage (VR4) in case of extension of
autopilot interconnection cable:
1. Disconnect S1-S2-S3 inputs.
2. Enter Debug mode in AP45. (See page 7-5).
3. Step through the loop until you find “Flux Sin” and/or “Flux Cos”.
4. Adjust RV4 until sin/cos reads exactly 2.50 V.
5. Reconnect the S1-S2-S3 inputs.
6. Verify correct heading readout on AP45 in Manual mode compared to the
Gyrocompass.
Lining up Gyro Synchro transmitter:
When the transmitter is correctly installed, the S1-S2-S3 voltage levels should be
in accordance with figure below.
30 60 90 120 150 180 210 240 270 300
S1
S2
S3
0 330
S1-S3 = 0V at 0 and 180 degrees
S2-S3 = 0V at 60 and 240 degrees
S1-S2 = 0V at 120 and 300 degrees
360
I.e.: Measuring between S1 and S3 should give 0 volts when gyrocompass shows
heading 000 (north).
If not, loosen the transmitter’s fastening device and turn transmitter until reading
is correct.
If the autopilot should lose or read erratic data stored in the memory (RAM), this
alarm will be given, and the autopilot is simultaneously set to MANUAL-mode. A
selection of factory settings are then automatically entered into the memory.
These settings should be checked before AUTO-mode is re-selected (See “Selection
of parameter settings” page 6-2.).
DATA FAILURE
CHECK SETTINGS