Simrad ROBERTSON AP45 manual G40A Gyro Interface, Angle

Robertson AP45 Autopilot	Page 7-3
Trouble shooting

b.Enter the DEBUG-mode (see page 7-5)and verify that the sine and cosine signals varies with the heading between approx. 0.5 and 4.5 volts. If not, proceed to "c".

c.Check all connections between the fluxgate compass and the FI100 unit and between the FI100 unit and the AP45 control unit. If found OK, proceed to "d".

d.Try a spare FI100 Fluxgate Interface PC-board.

G40A GYRO INTERFACE

a.Verify that the gyrocompass is working properly.

b.Refer to “G40A Gyro Interface Unit” page 5-9.and check that the G40A is operating properly with special attention to LEDs as explained. If the unit is not working properly, check all connections to the gyro compass and the AP45 control unit. If found OK, proceed to "c".

c.Check the signal transmission to AP45 by trying the different SW1 test positions. Verify the sin/cos output levels and/or the AP45 display readings are according to table.

1	2	3	4	Angle	SIN	COS
I	0	0	I	0°	2,5V	2,5V
0	I	0	I	45°	4V	4V
I	I	0	I	90°	4,5V	2,5V
0	0	I	I	180°	2,5V	0,5V
I	0	I	I	270°	0,5V	2,5V
0	0	0	I	45° STEP	–	–

d. Try a spare G40A Gyro Interface PC-board.

If the problem is still present after replacement of the heading sensor or interface, the problem most probably lies within the control unit.

5V

4.5V

COSINE

2.5V

SINE

0.5V

0 90 180 270 360

Simrad Robertson AS

Egersund - Norway