AccuGrade Laser System Caterpillar

Valve Calibration

This calibration wizard will guide the user through the required actions for performing an automatic valve calibration on the dual mast system. The following menus are used.

1. "Set Lower Limit"

2. "Set Upper Limit"

3. "Confirm Start"

4. "Calibration Status"

5. "Exit-Success"

6. "Exit-Error" (not shown in this document)

The "Exit-Success" screen is displayed when a successful automatic valve calibration is completed. The "Exit-Error" screen will display a description of the automatic valve calibration error.

Screen Format

Illustration 1	g01163470
(44) Number of screens (45) Prompt for user action (46) Success Indicator (47) Laser Strike Value (48) Laser Strike Limit Range (Lift Valve) (49) Laser Strike Window (50) Laser Strike Indicator

The top banner of the of the display shows the text that is listed below:

"<- Valve Calibration" - This message is displayed when the lift valve is calibrated.

"Valve Calibration ->" - This message is displayed when the tilt valve is calibrated.

Only the information for the sensor used in the calibration is displayed during the calibration. After selection, both the upper calibration and the lower calibration limits are displayed. The OK/right reset button is used in order to continue the calibration process. The ESC/left reset button is used in order to abort the calibration process. The activity indicator is animated in order to convey to the user that a sensor signal is available and that the calibration is in progress even if you do not observe any blade motion.

The user can press the ESC/left reset button on any screen of the automatic valve calibration wizard in order to terminate the calibration in progress. If the user is in the calibration status screen, this action shows the "Exit-Error" screen, with the text "Abort". In all other screens, the user is returned to the "Valve Calibration" menu item screen.

Procedure

1. Start the machine and allow the hydraulic oil to reach the normal operating temperature.

2. The engine speed should be set at high idle.

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Never look into a laser beam or point the beam into the eyes of other people. Set the laser at a height that prevents the beam from flashing directly into people's eyes.

3. Set up a laser transmitter.

   Note: Caterpillar recommends the use of a laser transmitter with the following features: automatic self-leveling mode, 600 rpm min rotational speed and automatic out of level shutoff. Read the operator manual and follow the operator manual that is supplied with the laser transmitter. The tripod and laser should be located at least 46 m (150 ft) away from the machine. The laser should be located in an area where the laser will not detect reflections or any light source that could disrupt the laser. Set the height of the tripod and the laser transmitter so that the laser beam will strike the laser receiver when the receiver is positioned correctly on the machine. Set the laser high enough so that the cab of the machine will not stop the laser beam from being detected by the laser receiver.

   Note: Avoid extending the electric masts further than one-third of the total distance that the masts can be extended in order to ensure a greater accuracy during calibration.

4. Raise the blade approximately 30 cm (12 inch) off the ground.

Note: If the display is still in the installation menu, then proceed to Step 8.

5. Place the power/setup switch in the "i" position.

6. Press the ESC/left reset button in order to bench the mast.

7. Perform the following procedure in order to enter the Installation menu.

   1. Press and hold down the cursor scroll button

   2. Hold the right mast elevation/menu scroll switch in the DOWN position.

   3. Press and hold down the ESC/left reset button.

   4. Release all simultaneously.

      This causes the Installation menu to be shown on the display.

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Illustration 2	g00987334

8. Use the right mast elevation / menu scroll switch or the left mast elevation / menu scroll switch in order to toggle through the Installation Menu until Valve Calibration is selected.

9. Press the OK / right reset button . This causes the "Valve Calibration" menu to be shown on the display.

   Refer to Illustration 3 for the Dual Mast system.

   Refer to Illustration 4 for the Single Mast system.

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Illustration 3	g00987335
Display screen from Dual Mast system

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Illustration 4	g01052711
Display screen from Single Mast system

10. Use the right mast elevation / menu scroll switch in order to select the "<- Valve Calibration" in order to calibrate the lift valve. The valve calibration for the lift valve is highlighted on the display by default.

11. Press the OK / right reset button in order to start the calibration procedure.

12. Set the lower limit.

    When this screen is shown, the user must set a valid LOWER calibration limit.

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    Illustration 5	g01091276
    (50) Laser Strike Indicator (55) Valid Limit Range

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    Illustration 6	g01091304
    (56) Cal limit mark

    1. Use the machine's control lever in order to lower the blade until the laser strike indicator (50) is located within the valid limit range (55) . The valid limit range for the lower limit is marked with a vertical bold line as shown in Illustration 5. Once a valid limit is achieved "OK" will be shown in the lower right of the "<- Valve Calibration" message screen. Once a valid limit is selected, a graphic "Cal Limit" mark (56) appears as shown in Illustration 6.

    2. Press the OK / right reset button in order to continue.

       Note: The user must successfully set the lower limit before continuing to the next screen. In order to abort the automatic valve calibration, press any switch on the display except the OK / right reset button and the left mast elevation / menu scroll switch . The "Exit-Error" screen is shown with the text "Abort" when you abort the calibration.

       If an error is detected, the "Exit-Error" screen is shown. The possible causes of errors are listed below:

       • No sensor information

       • The limit measurement is too close to the sensor rail.

       • Unstable laser transmitter

13. Set the Blade Upper Limit.
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    Illustration 7	g01163500
    (50) Laser Strike Indicator (57) Valid Limit Range

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    Illustration 8	g01163569
    (58) Cal limit mark

    1. Use the machine's control lever in order to raise the blade until the laser strike indicator (50) is located within the valid limit range (57) . The valid limit range for the blade upper limit is marked with a vertical bold line as shown in Illustration 7. Once a valid limit is achieved, "OK" will be shown in the lower right of the "<- Valve Calibration" message screen. Once a valid limit is selected, a graphic "Cal Limit" mark (58) appears as shown in Illustration 8.

    2. Press the OK / right reset button in order to continue.

       Note: The user must successfully set the upper limit before continuing to the next screen. In order to abort the automatic valve calibration, press any switch on the display except the "OK/right reset" button and the "left mast elevation/menu scroll" switch . The "Exit-Error" screen is shown with the text "Abort" when you abort the calibration.

       If an error is detected, the "Exit-Error" screen is shown. The possible causes of errors are listed below:

       • No Sensor information

       • The Limit Measurement is too close to the sensor rail.

       • Unstable Laser Transmitter

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Illustration 9	g00987328

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Once the system is placed in automatic mode, blade movement may occur. Ensure that all personnel are clear of the blade before you place the system in automatic mode. Personal injury or death from crushing could occur.

14. "Confirm Calibration Start"
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    Illustration 10	g00987332

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    Illustration 11	g01057350

    1. Press the OK / right reset button in order to begin calibration. The display will show the progress of the Calibration.

       Note: Press the ESC / left reset button in order to abort the calibration.

       Status information is displayed that represents the percent completion of the calibration process. The "Exit-Success" screen will be shown on the display after the calibration is complete.

15. For a Single Mast system, STOP. The calibration is complete.

    For a Dual Mast system, proceed to Step 16

16. Press the OK/right reset button in order to return to the "Valve Calibration" menu.

17. Use the right mast elevation/menu scroll in order to select " Valve Calibration ->" in order to calibrate the tilt valve.

18. Repeat Steps 11 through Steps 14.a using the tilt function for the blade.

    Note: In order to set the Lower tilt limit, tilt the blade to the left. In order to set the Upper tilt limit, tilt the blade to the right.

19. When the valve calibration is complete, move the "power/setup" switch to the ON position in order to return to the guidance mode.