MacDon FD75 OM - Manual (Page 150)

OPERATION
To set the auto header height sensitivity, follow these steps:
1. Engage threshing, and feeder house.
2. On the combine display screen, select
Height Sensitivity.
3. Use the “+” or “–“ buttons to change the setting to 200.
4. Press ENTER to save the setting.
NOTE:
The setting can be changed between 10
and 250 in steps of 10.
It is factory
set to 100.
Figure 4.196: Combine Display
Sensor Operation
The position sensor supplied with the Auto Header
Height is (1K) 1000 ohm industrial series sensors
containing sealed connectors.
Normal operating signal
voltages for the sensors fall between 10% (0.5VDC)
and 90% (4.5VDC).
Below 5%, a sensor is considered to be shorted; above
95%, 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 4.197: Power, Ground, and Signal Wires
169894 136 Revision A