Siemens SINUMERIK 840Di sl Function Manual page 45

12/2008
For axes that also have a direct measuring system the overall rigidity curve over
the axis position is also displayed. The rigidity is determined independently of the
direction. The following rigidity characteristics are calculated:
Characteristic
Maximum rigidity
Minimum rigidity
Average rigidity
Standard deviation of the
rigidity
The equability test notifies the machine operator of faults and interference
resistances from feed axis elements. The curve of the recorded values indicates at
which axis position the disturbance is located. A trend analysis of the
characteristics will indicate any change in the status of the drive train.
Fig. 2-25: Measurement results of an equability test
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ePS Network Services, Function Manual (FH) - Release 12/2008
2.2 Variable monitors - Measurements and measurement series
Meaning
The characteristic returns the maximum rigidity
value via the rigidity characteristic in the measured
position range at the configured speed.
The characteristic returns the minimum rigidity value
via the rigidity characteristic in the measured
position range at the configured speed.
For calculating the characteristic, the mean rigidity
value is determined in the measured position range
at the configured speed.
For calculating the characteristic, the standard
deviation of the rigidity is determined in the
measured position range at the configured speed.
2 Maschine information
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