VDO COMPASS - Adjustment of the Compass Sensor; Troubleshooting

ample steered course 267°), taking the variation into account.
The set variation value remains stored in the VDO Compass, even when
it is switched off.
Adjustment of the Compass Sensor
A correct adjustment of the compass sensor is necessary if, after com-
pensation and variation setting, differences are found between the true
compass course and the true bearing.
On each course (N, E, S, W) note the measured differences
Difference = true bearing - compass indication.
(e.g. true bearing : 001°, VDO Compass: 002°, difference north: -001°).
Calculate the average of the differences.
The average is the angular value by which the compass sensor must be
turned for correct adjustment.
A positive sign (+) means that the sensor should be turned clockwise, a
negative sign (-) means counterclockwise.
Trouble shooting
Problem: Cause / Correction:
- No compass function - Check electrical connections per
wiring schematic
- Check voltage. Supply voltage is
10.8 to 32 V
- Compensation not possible. - Check probe installation instruc-
„
FAIL “ is displayed, or the tions
compensation cannot be - Avoid magnetic disturbances (brid-
concluded ges, sheet pilings, etc.) during the
circular course
33
ADJUSTMENT / TROUBLESHOOTING
267
CAL
OS 003
comp_e.qxd 08.04.1998 07:44 Seite 13