DASA 280 Measuring and Control System Caterpillar

• Operating mode

• Programming mode

In the operating mode, the display screen shows information about the tree that is being processed. In the programming mode, the operator can control the processing instructions and the operation of the harvester head. The diodes on the control unit can be used in either mode for testing and troubleshooting.

Illustration 1	g00418798
DASA Control Unit (1) Display screen. (2) Keypad. (3) Toggle switch. (4) Dial. (5) Sensor. (6) Light emitting diodes (LED).

Toggle switch (3) is used to select the operating mode or the programming mode. Move the toggle switch to the left in order to activate the operating mode. Move the toggle switch to the right in order to activate the programming mode.

Dial (4) adjusts the contrast of the display screen.

Sensor (5) measures the amount of light near the control unit. Display screen (1) will illuminate when the available light decreases below a set level.

Light emitting diodes (6) indicate the status of the functions.

Display Screen

Illustration 2	g00467665
Display Screen (Operating Mode) (A) Fed length. (B) Cutting zone indicator. (C) Diameter over bark at the saw bar. (D) Ramp function indication. (E) Color marking indicator. (F) Manual saw indication. (G) Species of tree. (H) Preselection length. (J) Number of trees. (K) Diameter over bark at delimbing knives.

Fed length (A) displays the length of the tree that has been fed through the harvester head. Fed length (A) is measured in centimeters. The value is continuously updated as the tree is fed through the harvester head. The fed length resets to zero after the saw cuts a log.

Cutting zone indicator (B) shows a black square when the log is at the cutting zone.

Diameter at the saw bar (C) is displayed in millimeters. This value is continuously updated as the tree is fed through the harvester head. This value is measured at the delimbing knives. However, this value is delayed so that you can view the value that is at the saw bar. This value can be adjusted in the "Prog Variables" screen.

Ramp indication (D) tells the operator if the ramp function is ON. When the function is on, the feed rollers advance the tree past the cutting zone. The tree is then fed back to the cutting zone. The distances of the ramp function can be set in the programming mode.

The color that will be painted on the end of the log is shown by indication (E). When "F1" is displayed, color 1 will be painted. When "F2" is displayed, color 2 will be painted. When "F3" is displayed, color 1 and color 2 will be painted.

When a "S/" is displayed at location (F), manual sawing is turned on. Manual sawing is active when the ignition is turned on. The operator can then select "Touch Cutting" or "Manual Cutting" by pressing the "SHIFT" button and "CUT" button.

The species of tree (G) must be selected before a tree is processed. If the "Machine Variables" are set for repeating of species, the computer will stay on the last species that was selected. The options of species are "PINE", "HARDWOOD", and "SPRUCE".

Reference: For more information on the ramp function, cutting function, and species repetition, refer to Operation and Maintenance Manual, SEBU7182, "Programming Variables".

Preselection length (H) indicates the length that was chosen from the preselection table. The tree will be cut to this length. The value is updated as a different length is manually selected by the operator or automatically selected by the DASA.

Reference: For more information on programming the preselection table, refer to Operation and Maintenance Manual, "Programming Preselections".

The total number of trees that have been processed for the current felling job is indicated at location (J). The value is updated when a tree is processed.

Diameter at the delimbing knives (K) is displayed in millimeters. The value is continuously updated as the tree is fed through the harvester head.

Keypad

Illustration 3	g00467212
Keypad

In the programming mode, the numbers on the keypad can be used to program the DASA. The "ESC" key is used to return to the previous screen. The arrow keys and the "." key are used to change pages on the display screen. The "ENTER" key is used to accept the value that was entered.

In the operating mode, the "RESET" key can be used to reset the display screen. The lengths and diameters on the display screen will be set to zero.

Diodes

Illustration 4	g00419778
Diodes

The diodes on the control unit are green in color when the function is activated. If the diode is red in color, there is a short circuit for the function. If the diode is orange in color, there is an open circuit for the function. The function for each diode is indicated in Table 1.

Note: The diodes that are not used are not listed in Table 1.