The importance of SCV threshhold calibration

iGrade SCV Threshold Calibration

The importance of calibration of the SCV threshold cannot be stressed enough! This step in optimizing the hydraulic flow is crucial in achieving precision accuracy while land forming. Every install of iGrade should include calibration of the SCV threshold. Each tractor will have its own value number and each scraper, ditcher, and/or box blade will have its own value number as well. These numbers need to be recorded for future use to prevent the need of recalibration. Refer to this video on best practice for calibrating thresholds with a potentiometer

When calibrating SCV thresholds with Gen4 displays:

  1. Place a single SCV display on either side of a run page, if setting up both SCV 1 & 3 place one above the other on the side of display,
  2. Open the ISO terminal and select the SCV threshold setup page in the iGrade setup,
  3. Choose an SCV to begin a calibration on,
  4. Select the drop down and begin either an extend or retract calibration, (the machine must be moving above 0.3MPH, and the SCV must be in the AUTO detent position,)
  5. Next adjust the SCV threshold up or down to the minimum setting where the yellow SCV bar flashes on and off or only just solid, this sets the SCV at the min threshold, allowing for optimum setting of control sensitivity range,
  6. Complete the above for all 4 extend and retract thresholds,

Keep in mind you should setup the SCV flow rates first as the thresholds will change with any adjustment to the flow rate.
If you find that the machine doesn’t move as desired after setting the threshold like this it is likely that the control sensitivity is set too low and can be increased,

NOTE: Detailed instructions on threshold calibration steps for Gen4 and earlier models can be found in the iGrade manual