MAC215990
183
Revision A
ϭϬϰϬϰϰϬ
A
B
C
D
E
Figure 3.215: Sensor Range too Narrow
A - Minimum Voltage Range
–
2.5 V
B - Maximum Voltage Range
–
4.0 V
C - Configured Voltage Range
D Minimum Voltage
–
0.5 V
E
Maximum Voltage
–
4.5 V
A sensor configured to have a voltage range that is less than
2.5 V (for example, range [C]) will have difficulty staying within
the ideal range of 3.6 V. The combine will seek to keep the
sensor within the narrow set range, resulting in the combine
continually
“
hunting
”
for the appropriate header height.
3.10.2
Recommended Sensor Output Voltages for Combines
The auto header height control (AHHC) sensor output must be within a specific voltage range for each combine, or the
AHHC feature will not work properly. The recommended lower and upper voltage values for best AHHC operation are
provided.
Combine Voltage Limits
Combine
Lower
Voltage
Limit (V)
Upper
Voltage
Limit (V)
Minimum
Range (V)
New Holland CR/CX - 5 V system
0.7
4.3
2.5
New Holland CR/CX - 10 V system
2.8
7.2
4.1
–
4.4
3.10.3
Manually Checking Voltage Limits
For the auto header height (AHHC) system to function correctly, the voltages reported to the combine by the header height
sensors must occur within the specified range.
NOTE:
On some combine models, the voltage can be seen in the combine cab.
NOTE:
If the standard plug is installed in connector P600, the plug sends the average of both sensors to the combine. If the
optional lateral tilt plug is installed in connector P600, the plug sends separate voltage signals from both sensors to the
combine.
DANGER
To prevent injury or death from the unexpected start-up of the machine, always stop the engine and remove the key
from the ignition before leaving the operator
’
s seat for any reason.
1.
Start the engine. For instructions, refer to the combine operator
’
s manual.
2.
Park the combine on a level surface.
