HARRISTON INDUSTRIES 93066, Руководство оператора

Страница: 55 / 92

50
4.10.7 Seed Bowl Volume
Each seed bowl is equipped with a senor to control the seed depth in the bowl. Seed depth levels can be
adjusted from the Harriston drive display. See page 35. The seed depth should be adjusted to be as low
as possible with minimal skips. If the bowl level is too high excessive doubles and skips may occur due
to the seed not being able to move freely to line up with the clamp arm. The manual flow control to the
feedboxes should be adjusted to keep the feed chains moving slowly with only brief periods of stopping.
NOTE: Use flow control for fine adjustments
Ultrasonic Bowl Level Sensor
An ultrasonic bowl level sensor is used to analyze the height of seed within the seed bowl. Figure 5
shows the sensor. These sensors are teachable to learn the height range that is required to be viewed for
this application. They will come taught from the factory, and should not need any further adjustment.
ANY MODIFICATIONS TO THE WIRING MAY HAVE ADVERSE EFFECTS TO THE
SENSOR AND WILL VOID ANY WARRANTY
. The sensors are able to function with 12-24V
applied. Better resolution will occur at higher voltages. For the application of sensing bowl height a
voltage of 24 V is required, and will be supplied using a 12 to 24 V power inverter. The sensor has three
lights on the back of the sensor. During normal operation the light will be yellow if no seed is visible in
the sensing window. When seed becomes visible in the sensing window the light will turn green, and a
red light will turn on. The red light will become brighter as the seed comes closer to the sensor.
The following items must work together:
a. The sensor must have an unobstructed view of the bowl. The sensor can be moved on its
mounts to change the fill level in the bowl.
b. The hydraulic motor runs at a speed determined by the volume of oil flowing through the
circuit. Normally, a 3 g.p.m. (11 Lpm) flow rate provides the optimum feed rate. Use the flow
control on the planter to set the flow rate.
A high flow rate will increase the speed of the feeding chain and require excess cycling of the system.
A low flow rate will require the chains to constantly move. If it is too low, there will not be enough
seed supplied for consistent planting.
Major seed height adjustments should be done in the Harriston Drive program. Minor adjustments
should be made using the manual flow controls.
Fig. 1 : Ultrasonic Seed Bowl Height Sensor