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MPH-02, MPB-02, MPD-02
Determining the Reference
Position
Reference Position by Series of
Measurements
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
When the position data reference was established for the actual position
value system, the correction value related to the current actual position
value is drive-internally determined as follows:
x
= (S-0-0051/53 - P-0-0403) * (P-0-0404 - P-0-0402) * P-0-0406
k
Xk:
correction value, temperature- and position-dependent
S-0-0051/53: actual position value encoder 1 or encoder 2
P-0-0402:
axis correction reference temperature
P-0-0403:
axis correction reference position for temp. corr.
P-0-0404:
axis correction actual temperature pos.-dependent
P-0-0406:
axis correction temperature factor pos.-dependent
Fig. 8-52:
Determining the correction value, temperature- and position-
dependent
For position-dependent temperature correction there is an axis position
that is not invalidated by variations of temperature. It is the reference
position for position-dependent temperature correction and is entered in
parameter P-0-0403, Axis correction reference position for temp.
corr.
Determining the reference position by:
• direct
measurement,
transmission elements allows unequivocally recognizing the reference
position
- or -
• a series of measurements with which the actual position value error is
measured at axis positions clearly different from the reference position
(at constant temperature that is clearly different from the reference
temperature (P-0-0402))
As in the majority of cases it is impossible to determine the reference
point by direct measurement, determining the reference point by means of
a series of measurements is of great importance.
correction value (x
)
k
x
k3
x
k2
machine zero point
x
act1
x
P
(x
k1
1
reference position (x
Fig. 8-53:
Illustration of the reference position
By means of the measuring points (P
the reference position by the equation of an approximated straight line:
x
:
reference position
0
b:
intersection point of straight line and correction value axis (x
a:
gradient of the straight line
Fig. 8-54:
Equation for determining the reference position
Drive Functions
if
the
arrangement
P
P
(x
,x
)
2
act2
k2
x
act2
,x
)
act1
k1
)
0
, P
, P
) it is possible to determine
1
2
3
−
b
=
x
0
a
8-65
of
the
mechanical
(x
,x
)
3
act3
k3
actual pos.
x
act3
value (x
)
act
)
k
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