TEEJET 5000 OPERATORS MANUAL GENERAL FUNCTIONS
2.17
FORWARD SPEED SENSOR
There are 3 possible speed sensors available in each of the TeeJet 5000 version
4.xx implement programs.
WHEEL TRACTOR
WHEEL IMPLEMENT (Wheel sprayer, Wheel spreader, etc.)
RADAR
The best speed sensor for the implement in question is described in each of the
implement’s chapters, but the calibration procedure for each sensor type is almost
the same.
WHEEL TRACTOR
The speed signal can come from a sensor fitted in the gear box, or on a drive
shaft, or from a sensor fitted on a wheel, depending on the make and model of the
tractor used for fertiliser spreading. As the distance driven per pulse can be low
for, i.e. a sensor fitted in the gearbox, the distance per pulse is encoded in
centimetres with 3 decimals.
Pressing the “WHEEL TRACTOR” key allows the operator to select which sensor
the TeeJet 5000 gets it’s speed signal from. The selected sensor is always shown
at the top of the display along with the distance per pulse.
The TeeJet 5000 has an automatic speed calibration program that should be used
for sensors that generate more than 1 pulse per metre. The automatic calibration
procedure can also be used for normal speed sensors if the distance per pulse is
not greater than 100 cm. (Wheel circumference divided by number of magnets).
Manual speed calibration must be used if the distance driven per pulse is greater
than 100 cm. (fitting more magnets to the wheel may solve this problem and allow
the automatic calibration procedure to be used).
WHEEL IMPLEMENT
Certain implements are fitted with a speed sensor that give a correct number of
pulses for automatic application with the TeeJet 5000. This sensor should be used
if mentioned in the chapter concerning the implement in question.
Calibrating the wheel implement sensor is almost the same as described for wheel
tractor.
RADAR
If the tractor is fitted with radar then select “RADAR” and forward speed will be
measured from the radar. Radar and the number of pulses per metre will be
displayed at the top of the screen. The number of pulses per metre will vary from
radar to radar; typical figures are 100 or 130.
The angle at which the radar is fitted in relation to the ground will affect the
number of pulses per metre, we recommend using the automatic calibration
procedure, which is described in the following for wheel tractor.
IMPORTANT! Working in crops that are blowing in the wind or working in
areas with surface water can affect the accuracy of the radar,
we recommend using a speed sensor fitted to the tractor under
these circumstances.
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