Simrad ROBERTSON AP45 manual G45 Gyro Interface, Lining up Gyro Synchro transmitter

Page 7-4	Robertson AP45 Autopilot
	Trouble shooting

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.

S1

S3

0 30 60 90 120 150 180 210 240 270 300 330 360

S2

S1-S3 = 0V at 0 and 180 degrees

S2-S3 = 0V at 60 and 240 degrees

S1-S2 = 0V at 120 and 300 degrees

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.

DATA FAILURE

CHECK SETTINGS

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.).

Simrad Robertson AS

Egersund - Norway