TUBE AS 3725285 - Caterpillar

Sonic Grade Sensor Operating Parameters
Sonic Grade Sensor Operating ParametersThe grade sensors operate by emitting sound waves and determining the time it takes for the sound wave to reflect back. The time it takes for the sound wave to reflect back is proportional to the distance the object is from the sensor. The sensors work off the first object that reflects the sound waves back.The sound waves emitted by the sensors form a cone as shown in the illustration. It is important not to have objects within the cone except for the grade reference. Otherwise, the system may not work properly or may lockup. The grade reference, which can have as small of diameter as fishing line, must be within a 457 to 1400 mm (18 to 55 in) range of the sensor.In automatic, the sensors control machine front leg elevation provided the grade reference is within the 60 mm (2.4 in) range of the on grade centerline (automatic mode set point). Should the grade reference suddenly move out of the range, by reading a road pothole for example, an alarm will sound and the system will go to manual operation (will not react). Once the grade reference comes back within range, normal automatic operation will resume.The on-grade indicator and correction indicators inform the ground operator as to where the rotor is with respect to grade. While on grade [within 4.57 mm (.18 in)] the on-grade indicator illuminates. Between 4.57 to 15 mm (.18 to .6 in) off grade, a chevron flashes, pointing the direction the rotor is moving to correct itself. Between 15 to 60 mm (.6 to 2.4 in) off grade, the chevron will be solid (illuminated continuously). The preceding illustration shows the dimensions of each range and the corresponding indications.Calibration Modes
Grade/Slope Controller - Calibration Modes
(1) Left readout. (2) Right readout. (3) Left adjustment indicator. (4) Right adjustment indicator. (5) Left depth adjustment knob. (6) Left mode switch. (7) Right mode switch. (8) Right depth adjustment knob. For calibration mode procedures, refer to the Operation And Maintenance manual.The grade/slope controller has six calibration modes which can be accessed:* "CAL SLP" slope calibration.* "AUT OFS" auto valve offset calibration.* "CAL OFS" manual valve offset calibration.* "HR" hourmeter access (hours system is on, and hours in auto).* "BEP" warning beeper on/off.* "CAL UNT" readout units (inches, feet, or centimeters).The calibration modes are accessed by holding both mode switches to CAL, and simultaneously turning the right depth adjustment knob. The right depth adjustment knob scrolls to the various modes which are indicated in the right readout. Once the modes are scrolled through, the right readout goes blank. Turning the adjustment knob further will again scroll through the modes.Once a mode is selected, release the mode switches and calibration information will appear on the readouts. The left adjustment indicator (3) or the right adjustment indicator (4) will be flashing. The flashing indicator (3) or (4) identifies which adjustment knob (5) or (8) to turn and identifies the