Page 36 of 87
Calibration of LookAhead
LookAhead needs to be calibrated to the capacity of the nozzles. Boom size and number of
sections also have an influence so no standard calibration value that can be put into the
HC5500.
In some cases, LookAhead may have limited effect. For example:
1. Nozzles of low capacity are used (e.g. ISO 01, ISO 02).
2. The boom has many sections.
3. A combination of all the above.
Recommendation is as follows:
Extended Menu E8.1.1
Min. Duty Cycle (PWM) = 5%
Extended Menu E8.1.6
Regulation delay = 3 seconds
Menu 3.4
Regulation constant = 50%
A lower PWM value (e.g. 2%) will result in the pressure regulation valve takes longer to
reach the correct application rate.
Pressure regulation valve for LookAhead
The new pressure regulation valve that works with the LookAhead system has a pulse
generator built on to the motor. See Picture 12.
It counts how many revolutions the motor has taken and hereby the electrical motor finds
marked positions.
When sprayer starts spraying, LookAhead registers the position (revolutions number on the
motor), speed and the flow to this position. When the sprayer stop, LookAhead will use the
registered flow, speed and valve positions and thereby be able to predict the position of the
pressure regulation valve when the sprayer is driving again at different forward speed.
Pressure regulation valve knob is colour-
coded Yellow.
The ratio between knob and motor turns is 1
to 150.
1 pulse pr. motor rpm.
Picture 12 Pressure regulation valve with the pulse generator
