214657
96
Revision A
4.1.1
AHHC Sensor Operation
Figure 4.1: Variable Resistor Type Sensor
The position sensors supplied with the auto header height
control (AHHC) system are 1000 ohm (1 k) industrial series
variable resistor consisting of a sealed unit with a three pin
connection point (A) and two mounting holes (B). A signal
wire is connected internally to a movable wiper (C) that
sweeps across a high resistance filament band. An external
arm is attached to the movable wiper (C) and as it moves,
the wiper moves across the resistance filament to change
the resistance at signal wire, which changes the output
voltage. The resistance across the power and ground pins
should be approximately 100 ohms. Normal operating
signal voltages are 0.5
–
4.5 VDC or 5
–
95% of available
voltage.
•
A sensor operating with a signal voltage
below 5%
is
considered to be shorted.
•
A sensor with a signal voltage
above 95%
is considered to be open.
•
A change in header height will cause the voltage signal to change.
4.1.2
Header Height Sensors
The PW8 Pick-Up Header is equipped with two height sensors
—
one at each end of header. The height sensors do
not require maintenance, but they may need to be repaired or replaced due to normal wear and tear.
The sensors may require calibration if there are problems with pick-up height control. Contact your Dealer.
Figure 4.2: Height Sensors
Summary of Contents for PW8
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Page 4: ...Figure 2 EC Declaration of Conformity 214657 ii Revision A...
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