Reference Calibration - ABB OmniCore IRB 6720 Product Manual

6 Calibration

6.4.5 Reference calibration

6.4.5 Reference calibration
Brief introduction to Reference Calibration
Reference calibration is a faster method compared to Fine calibration, as it refers
to a previously made calibration.
Manual tuning of calibration offset
Manual tuning of calibration offset is normally not needed, but can be useful in
some situations. The requirement to do manual tuning is that there is a known
accurate position, that worked accurately before the repair (step 5, see
introduction to Reference Calibration on page
Example "Adjust axis 4":
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1 Create a backup of the current robot system.
2 Check that the active calibration offset values corresponds to the values on
the calibration label (located on the lower arm or the base).
3 Jog the manipulator so that all axes are in zero position (ex use MoveAbsJ
instruction). Check that all axis scales are aligned with calibration marks.
4 If the scales differ from calibration marks it might depend on wrong turns of
the revolution counters. Make a marker line on the corresponding axis to be
able to validate the result of the calibration. If more than one motor revolutions
are wrong, the calibration will fail.
5 Use a verification position. This is especially recommended if all axes were
not aligned with the synchronization marks (step 3). Reuse an existing
position that is suitable and accurate so it can be used to validate the repair.
Use a position where a deviation in axis calibration gives a big deviation in
positioning. Note! Check the position after each repair in one axis.
6 Use Reference calibration to save reference values for all axes that is to be
replaced. Make sure that the values are saved in RobotStudio or FTP program.
The files are located in "Active system folder name/HOME/RefCalibFiles".
7 Perform the repair.
8 Make sure that the tooling and process equipment are the same as when
creating the reference. Use Reference calibration to update the system with
new calibration offset value for the repaired axis.
9 Check the position against the verification position (step 5).
10 Proceed with the repair of the next axis, if necessary, and repeat (step 8-9)
for every axis.
11 (For system containing SafeMove) Download new calibration values to
SafeMove. Use Visual SafeMove in RobotStudio.
12 (For system containing SafeMove) Synchronize SafeMove to activate
SafeMove.
13 Perform test run.
14 Update the calibration label with new resolver values (calibration values).
1 Create a backup.
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Product manual - IRB 6720
3HAC085697-001 Revision: C
Brief