OPERATION
1. Engage threshing and feeder house.
2. Select HEIGH T SENSITIVITY on the combine
display screen.
3. Use the ‘+’ or ‘–’ buttons to change the setting to 200.
4. Press ENTER to save the new setting.
NOTE:
The sensitivity can be changed from 10–250 in
steps of 10. It is factory set to 100.
Figure 3.260: Combine Display
3.8.14 Sensor Operation
The positio n s ensors supplie d with the Auto Header Height
Control (AHHC) system are (1K) 1000 ohm industrial series
sensors containing sealed connectors. Normal operating
signal voltages for the sensors fall between 10% (0.5VDC)
and 9 0% (4.5VDC).
A sensor operating with a signal voltage below 5% is
considered to be shorted, and a sensor with a signal
voltage above 95% is considered to be open. An
increase in sensor voltage correlates to an increase in
header height.
Each sensor is constructed with a power wire and a ground
wire. Inside the sensor, these two wires are connected
by a high resistance filament band (C). The resistance
measured across the power (A) and ground (B) wires
should read a constant value between 800 and 1200 ohms
(0.8–1.2 k) with the nominal reading being 1000 ohms (1 k).
Figure 3.261: Power, Ground, and Signal Wires
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Revision A
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