MAC215990
181
Revision A
3.10.1
Auto Header Height Control Sensor Operation
The position sensors supplied with the auto header height control (AHHC) system communicate data about the header
’
s
height to the combine
’
s computer.
1029370
A
Figure 3.212: Height Control Sensor Locations on Float Module
Auto header height control sensor overview
Two Hall effect sensors are installed on float indicator needles (A). As the header rises and falls, the sensors communicate
the header
’
s height to the combine
’
s computer. The combine
’
s computer will, in response, raise or lower the feeder house
so that the header can maintain a consistent cutting height.
The normal operating signal voltages for the sensors fall between 0.7 VDC and 4.3 VDC. An increase in sensor voltage
correlates to an increase in header height, while a decrease in sensor voltage correlates to a decrease in header height.
Any sensor error results in a 0 V signal, which indicates either a faulty sensor or insufficient voltage supply.
