3.6 | Valve Threshold Calibration

Finding

Valve TheThreshold Calibration Menuestablishes

the minimum and maximum output values used by Automatic Control. Access the COMMAND valve calibration page by going to: More > COMMAND Settings > Valve Cals.

Minimum Threshold (Min %) determines the lowest output that reliably opens the hydraulic valve. Maximum Threshold (Max %) limits the highest output available to Automatic Control.

Calibration InterfaceProcedure

This page is used to calibrate the valve outputs such that:

The minimumCOMMAND outputECU causeswill thenot valve to open and an extremely slowrequest movement of the implement canunless bethe seen.user has pressed one of the test buttons and is holding the engage button.

Open More → COMMAND Settings → Valve Cals. TheSelect maximumthe function and direction to calibrate. Press TEST and hold the machine ENGAGE button when instructed. Increase Min. % until the implement begins moving consistently at a very slow speed. Reduce Min. % slightly if movement becomes abrupt or unstable. Adjust Max. % as required:

For proportional solenoids, limit output engagesto theapproximately hydraulics1800 atmA. Reduce further if lower maximum speed,implement butspeed notis so fast that there are risks of mechanical damage.desired. Repeat for all active directions and functions.

Calibration Test Buttons

The interface"+", is"−" shownand "TEST" buttons are used during the calibration process to incrementally increase or reduce a given threshold, which can then be tested using the process described in the screenshot below for the Height function. Each of the up and down direction have their own separate minimum and maximum calibration values.

Once calibrated and performing automatic control, the COMMAND ECU will activate the outputs in the range from minimum to maximum to ensure movement over the whole signal range.

Interface Overview

The Up & Down Sections

The upper area next to the "Up" arrow shows the the minimum and maximum calibration values used when moving the implement upward.

The area next to the "Down" arrow shows the minimum and maximum calibration values used when moving the implement downward.section.

Calibration Progress Icons

This icon indicates that a value has not been calibrated yet. All minimum and maximum values for all active functions must be calibrated before performing automatic control.

This icon indicates that a value has been calibrated. Once all min and max values display this icon, the function has been successfully calibrated.

Ticks next to Min or Max values mean that the test button was pressed, but do not indicate a correctly calibrated function.

Validation

Verify that:

Implement

Min.movement Threshold

begins

By default, the minimum threshold for each direction of each function is 0%. This parameter determines the lowest signal output that the ECU will send to the valve if the height error is greater than X centimeters.

Max. Threshold

By default, the minimum threshold for each direction of each function is 100%. This threshold can be used to reduce the maximum output of the ECU down from 100% (i.e. 100% valve flow), which would have a similar effect to reducing the hydraulic flow output of the hydraulic valve using tractor controls; however, this will generally only affect automatic control speeds, or manual control speeds if an Analog or CANBUS joystick is being used with COMMAND.

For proportional solenoids, the max. % is used to ensure the commanded output signal is no greater than 1800 mA, otherwise overcurrent protection may be triggered by the ECUsmoothly when extendingcommanded.

or retracting at 100%.

Swap Extend / Retract

Used to reverse the direction of the function in a similar way to swapping hydraulic hoses around at the back of the tractor.

Calibration Test Buttons

The "+", "−" and "TEST" buttons are used during the calibration process to incrementally increase or reduce a given threshold, which can then be tested using the process described in the next section.

The COMMAND ECU will not request movement of the implement unless the user has pressed one of the test buttons and is holding the engage button.

General Calibration Process

Press the "TEST" button corresponding to the function to be calibrated. A new dialog will open displaying instructing to press the physical "ENGAGE" button to test the hydraulic movement. The function being calibrated and the current valve command value will be displayed.

Ensure the implement is clear of all personnel and objects before pressing the Test button!

Min. Threshold

By default the minimum threshold will be 0%. Increase the min. value by a small amount e.g. 5% and then perform a testing as mentioned above and observe the commanded output milliamps increasing.

The goal is to set Min. % to a value that just barely causes the hydraulic valve to open for a very slow gradual movement. This is sometimes referred to as the valve's "cracking point". We recommended increasing in increments of 5% until gradual movement is seen, then reduce by 1% at a time to find the threshold.

The implement should begin moving consistently when the threshold is exceeded, without

No excessive delay or valve chatter.chatter

Max.occurs.

Threshold

Adjust Max. % downward from 100 until the commanded output is roughly 1800mA to provide some padding for changes in solenoid temperature and environmental factors. Continue to reduce this value further if you would like to slow maximum

Full-speed of the implement, but keep in mind this will slow down how fast the blade can reach the design height.

Proportional Solenoid Calibration Process

Testing Calibration Values

Press the "TEST" button corresponding to the function to be calibrated. A new dialog will open displaying instructions to press the physical "ENGAGE" button to test the hydraulic movement. The function being calibrated and the current valve command value in milliamps (mA) will be displayed. 

 Ensure the implement is clear of all personnel and objects before pressing the Test button!

Min. Threshold

By default the minimum threshold will be 0%. Increase the min. value by a small amount e.g. 5% and then perform a testing as mentioned above and observe the commanded output milliamps increasing.

The goal is to set Min. % to a value that just barely causes the hydraulic valve to open for a very slow gradual movement. This is sometimes referred to as the valve's "cracking point". We recommended increasing in increments of 5% until gradual movement is seen, then reduce by 1% at a time to find the threshold.

The implement should begin moving consistently when the threshold is exceeded,available without excessivehydraulic delayinstability.

orAll valvecalibration chatter.indicators

Max.show Threshold

as

complete

Adjustbefore Max.commissioning %proceeds.

downward from 100 until the commanded output is roughly 1800mA to provide some padding for changes in solenoid temperature and environmental factors. Continue to reduce this value further if you would like to slow maximum speed of of the implement further when Automatic Control is engaged.