3. Drive functions
3−40
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
3.2.5 Identification and adaptation
During identification, mainly those parameters are deter
mined which are influenced by component fluctuations (e.g.
valve covers, cylinder friction) or unknown installation factors
(e.g. tubing connection, external friction), but the knowledge
of which is impor tant for the controller function.
For a good identification result, all boundary conditions must
be correctly set, especially the basic
data (mass without
workpiece and workpiece mass, supply pressure, etc.), as
well as the mechanical drive characteristics (especially the
axis zero point offset).
Repeat the identification if one of these parameters changes
during operation.
When does identification have to be carried out?
Identification is required during commissioning, when the
valid configuration data changes or
when certain components
are exchanged (see Exchanging components", section
A.3.2). If the CMAX detects a corresponding change when
comparing the set with the actual configuration, a correspon
ding error message is generated and the controller is not acti
vated.
You must decide for yourself whether the identification data
should be reset. E.g., after a
fault due to mixed up axis
strings, the identification data can continue to be used after
changing them back.
The CMAX signals a warning if identification should be
carried out due to a change.
The CMAX signals a fault if identification must be carried
out due to a change.
The identification status parameter (PNU
1171) contains
information about the identification status.
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