Hardi AutoHeight, Инструкция

Страница: 14 / 62

3 - Description
14
Understanding Your AutoHeight System
Understanding Performance Issues
Your AutoHeight will work well in most situations. However, as with any equipment, it is important that the operator remains
alert at all times. There may be some field and terrain situations where performance is diminished. In these situations the
operator must resume height control of the booms manually. A discussion of performance issues is given below to help
clarify these situations.
Sensitivity (Sensi) Setting
The AutoHeight system is configured to work well in most conditions, with warm hydraulic oil, at a sensitivity (
Sensi
)
setting of five. When you first begin operation at the start of a day, it may be necessary to operate at a higher sensitivity until
the oil has reached normal temperature. After warmup, keep decreasing the
Sensi
setting until the performance is
optimized, to avoid overheating of the hydraulic oil.
Different types of terrain may require different
Sensi
settings. The
Sensi
setting controls more than just response
time. It also determines how accurately the AutoHeight system will try to correct for height errors. The higher the sensitivity
the higher the accuracy. At low sensitivity, a few cm of error will be tolerated. At high sensitivity, virtually no error will be
tolerated. Therefore, the system will be much more active at high sensitivity than at low sensitivity.
÷
NOTE! Running AutoHeight at high sensitivity will increase heat build-up of the oil. Specially when AutoHeight
system is used with tractors that have an open centre system without load sensing, it may require lower sensitivity
settings to avoid overheating of hydraulic oil. See “Hydraulic hook-up” on page 23.
÷ NOTE! Field conditions and operator preferences determine the appropriate
Sensi
setting.
Boom Reaction Time
There are two key factors that determine how quickly your boom can react to changes in terrain. The first factor is the
available hydraulic speed. The maximum hydraulic speed of your boom was designed by the sprayer manufacturer and is
not improved or diminished with the addition of the AutoHeight height control system.
The second factor is the mechanical design of the sprayer. The
Sensi
setting does affect the reaction time of your boom
- the higher the number the quicker the response. However, how high you can run the
Sensi
setting is determined to a
large extent by mechanical issues related to the boom and sprayer.
Important design issues include the style of boom mount (for example, centre pivot or nonparallel links), the amount of
mechanical damping and spring centring on the boom lift mount, and whether a boom slant system is available on the
sprayer. All of these factors together determine the maximum
Sensi
setting you can run on your AutoHeight system.
This, in turn, will set the reaction time of the boom in a given situation.
The AutoHeight electronics are rarely the limiting factor in determining overall automatic height control performance.
AutoHeight over Ditches, Waterways and Outside Rounds
Many situations exist where one sensor may be reading over terrain that does not accurately reflect the situation for the rest
of the boom. For example, if you are spraying along a waterway, it may be necessary to run the outer boom sensor out into
the waterway itself. This situation is similar to the picture in “Figure 3 - Severe Terrain - Additional Sensors Required” on
page 12. In this example, the outer sensor will bring the boom lower than desired and may put the mid-point of the boom
at risk. Outside rounds adjacent to very weedy areas or tall thick grass are examples of the opposite situation.
In these situations the operator must remain alert and override AUTO mode when necessary. Addition of the optional severe
terrain (inner) sensors will greatly improve performance in these situations.
±
WARNING! In most countries spraying over ditches and waterways is strictly prohibited! Always follow local
legislation!