Hardi AutoHeight, Инструкция

Страница: 15 / 62

3 - Description
15
Driving Through Ditches and Over Terraces
Changes in terrain that include driving over terraces or through ditches are special performance cases. This type of terrain
can cause the sprayer to pitch and roll significantly. Sprayer operation at speeds of 15-30 km/h in severe terrain may result
in rapid changes in boom tip height. In these situations, typical sprayer hydraulic systems are not capable of tip speeds high
enough to correct for the induced error.
The sprayer’s roll control system will compensate for the sprayer roll in this situation and also add stability to your boom in
normal operating conditions.
Alternative solution is for the operator to recognize these situations before they occur and manually raise the boom
section(s) to a safe height. To return to AUTO mode, use the "AUTO (YES)" switch.
Sensor Capabilities
In order for the AutoHeight system to work at its maximum level of performance, the AutoHeight sensors must be returning
accurate height readings at the designed frequency. Under typical conditions, the sensors can provide accurate height
readings from 0.2 to over 3.0 m and return many height readings in one second. The target in SOIL mode can be identified
through stubble, young crops, row crops, and normal trash. The target in CROP mode can be identified over cereal grains,
specialty crops, and row crops. See the next section for more information on CROP and SOIL mode guidelines.
There are two main steps to ensure sensor performance. The first step is proper mounting. See “Hardware components” on
page 11 for more information on sensor mounting. The second step is to ensure that the protective foam covers on the
sensors are kept clean, and that the ultrasonic transducer behind the foam does not become corroded or excessively dirty.
Extra foam pieces are shipped with your kit. The transducer is a maintenance item and can be replaced at HARDI service
locations. Transducers can last up to ten years, depending on conditions. Refer to “6 - Maintenance” on page 47 for more
maintenance information.
If the mouth of the sensor becomes wet, it is normal for the sensor to return error messages until the transducer has dried
off. This could include rain or excessive overspray. Material can build up on the transducer if the sensor is mounted too close
to the spray nozzles. This is the reason that the sensor must be mounted at least 25 cm in front of the nozzles. It keeps the
sensor housing out of the normal region of overspray.
In the sprayer boom application, the sensors ignore any target that is closer than 25 cm from the bottom of the sensor
housing. This region is called the blanking range. Operating the sensor at heights near the blanking range is dangerous and
will affect performance because height readings can be very intermittent. This is the reason that each sensor must be
mounted at least 25 cm above the spray nozzles.
Understanding Crop Mode And Soil Mode
A unique feature of AutoHeight sensors is their ability to operate in CROP mode. In this mode the sensor will track the first
available sonic target. That is, when positioned over standing crop, the sensor will return the average height of the heads in
a circular area below the sensor. In the same situation in SOIL mode, the sensor will track the last available sonic target. That
is, signals from the heads, leaves, and trash will be ignored in favor of the ground.
It is important to note that the targets must be available and of sufficient strength for the sensor to "see" them. There may
be some crop and terrain situations that do not work well for CROP mode or SOIL mode. In these situations the operator
must resume height control of the booms manually.
In general, the addition of the severe terrain kit will improve performance in CROP mode. All of the situations discussed
below are lessened by the addition of the extra sensors on the wings.