The preselections table allows you to enter information for three different species of trees. The three species of trees are "PINE", "HARDWOOD", and "SPRUCE". For each species of tree, eleven different log lengths can be entered.
Note: If you are processing a different type of a tree, the preselections table for the species of tree can be programmed under "PINE", "HARDWOOD", or "SPRUCE". These three species of trees are only titles under which information can be entered.
An example of a preselections table is shown in Table 1.
| PINE | MinL MaxL MinD MaxD | Color P1 | |
|---|---|---|---|
| LenNr 1 | 255...258....200....230 | 1 | |
| LenNr 2 | 550...553....120....900 | 1 | |
| LenNr 3 | 520...523....120....900 | 1 | |
| LenNr 4 | 490...493....120....900 | 2 | |
| LenNr 5 | 460...463....120....900 | 3 | |
| LenNr 6 | 430...433....120....900 | 0 | |
| Select Length No:_ [Change Page F=-> R=. ] | |||
For each length number, a maximum length and minimum length must be programmed. The lengths are programmed in centimeters. The difference between the maximum length and the minimum length is the cutting zone. The cutting zone should be 3 cm to 4 cm.
If the difference between the maximum and minimum length is too small, the harvester head will not be able to find the cutting zone. If the difference is greater than 10 cm, the DASA will cut the log as close to the maximum length as possible. The log must always be in the the cutting zone for cutting to take place.
For each length number, a maximum diameter and minimum diameter must be programmed. The diameters are programmed in millimeters.
The diameter values are used to select the length of the log during automatic processing. The top diameter of a log must be between the maximum diameter and the minimum diameter for cross-cutting to take place.
For harvester heads equipped with a color marking system, a color can be specified for each length number. When a log is cut, the color specified in the preselections table will be sprayed on the log. The following numbers can be entered for the desired colors:
0 - No color marking
1 - Color 1
2 - Color 2
3 - Color 1 and color 2
Automatic Processing
After the species of tree has been selected and the tree has been felled, the operator can press the "START" button to begin automatic processing. The DASA will start with processing instructions for length number 1. The diameter sensor begins measuring the diameter of the tree. The DASA uses the diameter measurement to forecast whether the actual top diameter will be between the diameter values that are programmed for length number 1.
If the top diameter is within the limits for length number 1, the tree will be fed forward to the programmed length. When the tree reaches the cutting zone the tree can be cut using one of the following methods: manual cutting, touch cutting, or automatic cutting.
As the tree feeds toward the length that has been programmed for length number 1, the diameter is continuously measured. If the measured diameter is not within the limits for length number 1, the DASA will move to the instructions for length number 2.
If the forecasted diameter is outside of the diameter limits for length number 1, the DASA will make a new forecast based on the diameter values for length number 2. If the forecasted diameter is still outside of the diameter range for length number 2, the DASA will proceed to the next length number. This process continues until a diameter value that lies within the limits is reached.
If the log does not fall within the diameter range for any of the eleven length numbers, the DASA will not be able to automatically process the tree. The log must then be processed manually.
Manual Processing
A length number can be selected manually with the "CUT LENGTH +" button or the "CUT LENGTH -" button. The length can be selected before or after the "START" button has been pressed.
When a length number is manually selected, the top diameter of the tree does not have to fall within the diameter limits for the length number. The tree must, however, be within the cutting zone before cross-cutting can take place.
Programming the Preselections Table
To enter the programming preselection sub-menu, first move the toggle switch on the control panel to the right to activate the programming mode. Then press "1" and "ENTER" to access the preselections table. The first screen will be length numbers 1 through 6 for pine.
| PINE | MinL MaxL MinD MaxD | Color P1 | |
|---|---|---|---|
| LenNr 1 | ....0.......0........0........0 | 0 | |
| LenNr 2 | ....0.......0........0........0 | 0 | |
| LenNr 3 | ....0.......0........0........0 | 0 | |
| LenNr 4 | ....0.......0........0........0 | 0 | |
| LenNr 5 | ....0.......0........0........0 | 0 | |
| LenNr 6 | ....0.......0........0........0 | 0 | |
| Select Length No:_ [Change Page F=> R=. ] | |||
There are six screens for the preselections table, two screens for each species. Use the following procedure to program the length numbers:
- Use the "->" and "." key to find the screen that will be programmed.
- Select the length number that will be programmed. Press "ENTER".The cursor will appear under "MinL".
- Enter the new minimum length in centimeters. Press "ENTER". The cursor will then appear under "MaxL". Pressing "ENTER" moves the cursor from "MaxL" to "MinD" to "MaxD" to "Color".
- When the cursor reaches "Color" at the far right end of the line, enter the desired value. Pressing "ENTER" will move the cursor to the bottom of the screen. You can now select a new length number for programming. Press "ESC" to return to the main menu.
Length number 1 should be programmed with the cutting instructions for the most valuable dimensions of a log. The succeeding length numbers should be programmed for less valuable logs. Then, the DASA will always try to cut the log to the most valuable length.
Length number 11 should be programmed with the cutting instructions for a pulp log. When the "PULP" button is pressed the tree will be cut to the instructions for length number 11.