Gen4 - Calibration - Load Calibration Tips
This Tech Doc will offer a few suggestions to follow in order to perform an accurate calibration.
The points listed below
are recommended to follow for each of the calibration steps.
- Make sure to lower the stabilizers (if fitted) and try to level the carrier in both the pitch (longitudinal) and
roll (lateral) directions. Not only does it make the calibration safer, but the level ground will also make the
calibration more accurate.
Perform the calibration continuously. If there is a long delay between performing the zero (no load) and
gain (with load) steps, there may be a temperature change in the hydraulic oil which may cause differences
between the zero and the gain steps. Try and have the calibration load ready before starting the
calibration. If possible try and pick up the calibration weight without having to move the telehandler.
Zero Calibration – No Load
The zero calibration steps are the most important to perform accurately as the gain calibration steps are based
on the zero calibration. If these steps have been rushed or performed inaccurately, the resultant graph will
contain a number of outliers. And when it comes to the gain calibration it may be impossible to produce a
proper curve due to the inaccurate zero calibration performed earlier.
The following points outline how to achieve an accurate zero calibration
- Make sure to record a good range of points between the minimum and maximum boom angle. The
recorded data points should be within 5 degree increments and the software will enforce the data points
are within 10 degree increments.
- Data points recorded near the minimum boom angle are less accurate, due to the boom transition
between the down to up cycle. The software will enforce recording data points that are greater than 5
degrees of the minimum boom angle.
- Data points recorded near the maximum boom angle are less accurate, due to the boom approaching the
stop. If the boom hits the stop, the pressure reading will be exceedingly high - any boom angle limit features
are disabled while in calibration mode. The software will enforce recording data points that are less than 5
degrees of the maximum boom angle.
- Before performing the calibration, move the boom through its angular range of motion to determine the
minimum and maximum angles and whether the boom can reach the maximum angle unobstructed.
Observe the pressure sensor reading and make sure it is stable before recording the data point. The
pressure reading should be fluctuating by 5 units, due to the normal vibration caused by the engine. If it is
fluctuating more than 5 units the boom may be bouncing.
Gain Calibration – With Load
The gain calibration steps are usually the most difficult to perform and may require repeating the zero
calibration. An error in the zero calibration will be magnified in the gain calibration.
The following points outline how to achieve an accurate gain calibration
- Lift a heavy load. The heavier the load the more the pressure increases producing a more accurate gain
calibration. However, the boom needs to be able to extend to the length specified in the calibration
software.
- If calibrating a suspended load attachment, make sure the sling between the hook and the load is as short
as possible - to reduce the swing and to increase the angular range for calibration
- Follow the same guidelines as the zero calibration, recording points every 5-10 degrees and remains clear
of the minimum and maximum boom angle
- When performing the gain calibration step at extension and before performing the calibration, determine the
maximum extension of the boom with the additional weight of the load. It isn't necessary to fully extend
the boom to complete the calibration, but it must be able to extend to the length specified in the
calibration software.
When in the calibration mode the cutout is disabled, which means there is a risk of
tipping the machine if extending too far.
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