MPH-02, MPB-02, MPD-02
Drive Functions
8-59
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
The figure below illustrates the operating principle of precision axis error
correction:
Vcmd > S-0-0124, Standst. window
P-0-0411, corr.
table positive
+
act. pos.val.
(corrected)
corr. value internal
S-0-0124, Standstill window
S-0-0036, Velocity command value
act. pos. val., uncorrected
Vcmd < (-)S-0-0124, Standst. window
P-0-0412, corr.
table negative
Fig. 8-39:
Block diagram for precision axis error correction
The correction values are determined by means of a reference measuring
system (e.g. laser interferometer). Within the desired correction range the
drive successively moves to the support points for the different directions
and the corresponding position error is measured.
)
(
)
(
display
x
meas
x
xk
−
=
xk:
correction value relate to support point
x(meas):
measured position value at support point
x(display):
S-0-0051 or S-0-0053
Fig. 8-40: Determining correction value for precision axis error correction
The correction values relate to support point are entered in the tables
P-0-0411 and P-0-0412.
The required length of the correction range and the maximum value of the
number of support points determine the minimum support point distance.
If a lower number of support points is selected, a bigger support point
distance is required with a correction value of the same length. This
however can reduce the precision of correction!
)
-
,P-
-
(P-
points
support
of
max._no.
range
correction
of
length
P
0412
0
0411
0
_
_
0410
0
=
−
−
P-0-0410 :
axis correction support point distance
P-0-0411:
axis correction, correction table positive
P-0-0412:
axis correction, correction table negative
Fig. 8-41:
Determining the support point distance
Note:
With the value zero in parameter P-0-0410 the precision axis
error correction is deactivated!
Operating Principle
Determining the Required
Parameter Values
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
