LELY Lely Discovery 90 SW, Operator'S Manual

Page: 57 / 150

5.4006.8501.0
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Description and Operation 4-31
Long actions
Direct wall contact with the sensing wheel or indirect wall contact with the ultrasonic sensor are used to
keep the machine in the correct direction. This is the case during:
•
Fill water
•
Wall flw L .
•
Wall flw R .
•
Ultrasound L (or Ultrasound R or Ultrasound L+R ).
• Charger
If these actions continue for more than 10 m (33 ft) they are called 'long actions' because then the vehicle
passes the 'reset point' (between 3 to 10 m (9.8 - 33 ft)). At that point the angle is reset to 0 degrees and
a beep is sound.
'Long actions' compensate for the deviations caused by 'short actions'. It is therefore very important to
program a subsequent 'long action' after a succession of 'short actions'.
In a situation with a succession of 'short actions' ( Straight , Turn L <– and Turn R –> ) the vehicle can get
lost, due to an accumulation of errors (see figure 19 on page 4-32).
The risk of deviating from the programmed route can be minimized when (see figure 20 on page 4-33):
•
The machine has contact with the wall, barn or feed fence, either direct ( Wall flw L or Wall flw R ) or
indirect ( Ultrasound L ).
•
Bump points enable the control system to compare the travelled distance with its own information.
•
'Short actions' are mixed with 'Long actions' to correct the direction.
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