Gen4 - Attachments - What is a Load Calibration?
The load calibration procedure will ask the operator to calibrate the load for the attachment.
When the Gen 4 has an uploaded attachment load chart but no calibration information, then an attachment calibration must be performed. The technician/operator will be
required to perform the calibration procedure for each different attachment.
The first step in the procedure is to determine the pressure reading at the different boom angles and lengths (with no load on the attachment); this is referred to as the zero calibration. The zero calibration is made up of a series of
boom angle calibration steps, each at a different boom extension.
As the boom angle increases, the weight of the load (i.e. boom weight) shifts from the main lift cylinder to the
boom pivot. Thus the pressure reading decreases as the boom angle increases. During a boom angle calibration
step, the calibration software will ask to record the boom sensor data and store this information as a data point.
These data points are then combined to produce a graph. The graph results in a curve. The graph points are then
calculated to produce a curve of best fit.
Example below of a Zero Calibration – No Load
The same procedure is then repeated but with a different boom extension. If the boom segments extend in a
non-proportional manner, a boom angle calibration should be performed at each extension where the next
segment starts to extend. If the boom extends proportionally, it should only require another boom angle calibration
at maximum extension. To complete the calibration, at least one boom angle calibration needs to be performed at a
boom extension that is close to the maximum boom extension allowed for the attachment. The graph produces a
similar curve, however, the pressure required to lift the boom is greater when the boom is extended.
Once the zero calibration is completed, the system can now determine the resultant pressure with no load on the
attachment (given the boom angle and length).
Now do all of the above again with a known load weight - Gain Calibration
Now the system needs to know how the pressure increases when
lifting a load (this is referred to as the gain calibration). The operator will be required to lift a load with a known
weight and enter the weight into the software. The gain calibration is similar to the zero calibration; with boom
angle calibration steps at different boom extensions and the resultant graph curves are similar.
After the gain calibration is completed, the load calibration for this attachment is complete.
Before starting the load calibration make sure there are no faults and warnings before starting the calibration.
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