3. Drive functions
3−38
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
The axis zero point offset has a great influence on CMAX con
troller optimisation. Even small values (a few mm) must be
specified as exactly as possible:
The distance between the used stop (of the reference
point) and the cylinder end position (retracted piston rod)
is measured as the offset and entered as
a negative value.
When the piston rod is completely retracted (cylinder end
position) the value 0 must be entered as the offset.
Note
If the offset is imprecisely entered, the drive could end up
vibrating strongly depending on the setting of the involved
parameters.
· Always carry out identification again after the offset has
been corrected.
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