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System settings
78
Calibrating driving
speed sensor
The control system corrects the dosing as the driving speed changes.
An accurate driving speed signal is therefore essential.

Perform calibration of the driving speed:
•
before using the machine for the first time,
•
after adjusting the measuring system for driving speed, e.g.
after a sensor is replaced,
•
when other tyres or wheels are being used,
•
when used under extreme circumstances, e.g. with excessive
wheel slip.
•
in situations where one or more of the following causes for
deviations are present.
Deviations in driving speed measurement can be caused by:
•
engaging or disengaging front-wheel drive,
•
changing soil composition,
•
wheel slip,
•
more or less full hopper than during calibration,
•
variation in inflation pressure (changes the wheel diameter),
•
tyre wear,
•
working on slopes.
Some of the causes of deviations mentioned do not apply to
speed measurement on the wheel of a trailed machine.
All readings regarding skidding, driving tyre pressure, etc. are taken
from the measured wheel.
Preparation

Take all precautions necessary on the tractor and on the machine,
see

section »Tractor provisions« from page 63.

Connect the machine,

See section »Connecting to the tractor« on page 68.

Fill the hopper to half,

Check the settings in the control system with regards to driving
speed measurement and change as required,

See section »Driving speed signal« on page 77 51and

Check the inflation pressure and ensure that it is at the required
levels.

Drive to the site that you are going to spread.
Operation
Perform calibration for the driving speed as far as possible under
similar circumstances under which work normally takes place.
•
Carry out the calibration on the site that you are going to work on
•
The machine connected to the tractor and half filled,
•
and drive with the desired working speed.

Disengage the front wheel drive, unless it will also be engaged
while working.

Carefully measure a distance of 100 metres and mark the start and
end points, e.g. with pickets.

Place a marker on the tractor at the starting point, e.g. in the middle
of the front wheel.
100 metres