2000/12/04 Caterpillar

Asphalt Paver:

AP-1000B (PIN: 7HN1-UP)

AP-1050B (PIN: 6ZN1-UP)

AP-1055B (PIN: 8BM1-UP; ABB1-UP)

AP-650B (PIN: 9DN1-UP)

AP-900B (PIN: AGJ1-UP)

BG-225C (PIN: 5GN1-UP)

BG-240C (PIN: AGL1-UP)

BG-2455C (PIN: 6TN1-UP; ACM1-UP)

BG-245C (PIN: 4XN1-UP)

BG-260C (PIN: 8GN1-UP)

If the valve offsets are set with the hydraulic oil temperature at 38 °C (100 °F) and then increased to 82 °C (180 °F), the Topcon system for the grade and slope control may not operate properly. The current that is required to shift the spool valve for the grade control will increase when the oil temperature increases. The increase in current is caused by resistance in the coil. The problem is recognized when the up arrow or the down arrow continues to stay on and the control will not make the required change in the grade.

The proportional 24 volt system is controlled by a resistor in the cable from the machine to the screed. To configure the machine to ON/OFF, you must change the configuration value and the other values in the technicians menu. The values that follow should be used for the ON/OFF configuration:

Note: Record all settings before you change the system to the ON/OFF configuration.

Reference the Operation and Maintenance Manual, KEBU 7009, "Topcon Grade Control System". Access the technicians menu.

The settings that follow will allow the system to pulse the valve in the ON/OFF configuration.

Note: The settings that are in bold text are new for the ON/OFF configuration.

• Con = Configuration. Set Con at 9. Configuration (9) must be set before you set the offsets.

• 9An = Grade gain. Set 9An at 20.

• 9An = Slope gain. Set 9An at 20.

• SLP = Slope resolution. Set SLP at 0.1%.

• SS = Sonic Averaging Ski. Set SS to the OFF position. If you use the Sonic Averaging Ski, you should set the SS to the ON position.

• db = Dead Band. Set the db at 003.

• OFS = Valve Offset. Initially set the OFS at 27. High offsets will cause the system to overshoot. See fine tuning the offsets later in this section.

• UnE = Units. Set the UnE at inch or cm position.

• Ser = Stringline. Set the Stringline to the ON position.

• FrE = Frequency. Set the FrE at 7.0.

• AU9 = Averaging. Set the AU9 at 10.

• Rp = Ramp Time. Set Rp at 2.0.

• ECO = Temperature Cut Out. Set the ECO at the 0 position.

• Loc = Lock. Set Loc at the ON position.

• RPd = Ramp Distance. Set the RPd at the 0.05.

Check the Performance of the System and the Operation of the ON/OFF Configuration (Fine Tuning Offsets).

1. Move the machine to a flat surface. Lower the screed to the ground. Pull the machine slightly forward.

2. Move the tow point cylinders to the center position.

3. Put the screed thickness controls to null.

4. The following conditions must be met during the performance check:
   • The park brake must be applied.

   • The machine must be in pave.

   • The maximum speed potentiometer must be at the 50% position.

   • The propel control must be forward.

   • The engine must be at high idle.

   • The hydraulic temperature must be at 38 °C (100 °F).

5. Put the control box for the system in the Slope position. Put the control to null.

6. Use the grade adjustment knob and turn the knob clockwise by one click. Observe the movement of the tow point cylinder.

   Note: The cylinder should move about 1/2 inch in 2 or 3 seconds.

   If the cylinder does not make a complete change in 2 or 3 seconds, you should increase the offset of the valve. If the cylinder moves too fast, you should decrease the offset of the valve. If the cylinder overshoots the correct position and the cylinder then returns, you should decrease the offset of the valve.

Note: The valve offsets should always be set with the tow point cylinders at the center position or near the center position.

7. Access the menu for the performance. Make the changes that are required to the offsets until the criteria for the performance of the system is met.

8. Repeat the procedure for the opposite direction.

9. Repeat the procedure for the opposite side of the machine.

Reference Numbers for Proportional Factory Settings

• 9An = Grade Gain. Set the grade gain at 20.

• 9An = Slope Gain. Set the slope gain at 20.

• SLP = Slope Resolution. Set the slope resolution at 0.1%.

• SS = Sonic Averaging Ski. Set SS to the OFF position. If you use the Sonic Averaging Ski, you should set the SS to the ON position.

• db = Dead Band. Set the db at 003.

• OFS = Valve Offsets. Set the OFS between 350 and 400. As the number increases, the speed of the cylinder will increase. You should reference the System Performance Section and the System Operation Section in the Operation and Maintenance Manual, KEBU7009 in order to set the offsets. You should set the offset for the valve with the tow point at the center position or near the center position.

• UnE = Units. Set the UnE at inch or cm.

• Ser = Stringline. Set the Ser to the ON position.

• FrE = Frequency. Set the FrE at 5.0.

• Con = Configuration. Set the Con at E or 15.

• AU9 = Averaging. Set the AU9 at 10.

• Rp = Ramp Time. Set the Rp at 2.0.

• ECO = Temperature Cut Out. Set ECO at the 0 position.

• LOC = Lock. Set LOC at the ON position.

• RPd = Ramp Distance. Set RPd at .05.

Check of the Performance of the System and the Operation of the Proportional Configuration (Fine Tuning Offsets).

1. Move the machine to a flat surface. Lower the screed to the ground. Pull the machine slightly forward.

2. Move the tow point cylinders to the center position.

3. Put the screed thickness controls to null.

4. The following conditions must be met during the performance check:
   • The park brake must be applied.

   • The machine must be in pave.

   • The maximum speed potentiometer must be at the 50% position.

   • The propel control must be forward.

   • The engine must be at high idle.

   • The hydraulic temperature must be at 38 °C (100 °F).

5. Put the control box for the system in the Slope position. Put the control to null.

6. Use the grade adjustment knob and turn the knob clockwise by one click. Observe the movement of the tow point cylinder.

   Note: The cylinder should move about 1/2 inch in 2 or 3 seconds.

   If the cylinder does not make a complete change in 2 or 3 seconds, you should increase the offset of the valve. If the cylinder moves too fast, you should decrease the offset of the valve. If the cylinder overshoots the correct position and the cylinder then returns, you should decrease the offset of the valve.

Note: The valve offsets should always be set with the tow point cylinders at the center position or near the center position.

7. Access the menu for performance. Make the changes that are required to the offsets until the criteria for the performance of the system is met.

8. Repeat the procedure for the opposite direction.

9. Repeat the procedure for the opposite side of the machine.