Technology Option F01 08.2012
6SE7087-6QX70 (Version AN) Siemens AG
9-38 Compendium Motion Control SIMOVERT MASTERDRIVES
Example:
The position sensing motor encoder is parameterized with P171=18
such that one revolution of the rotary axis equals 2
18
increments per
revolution. This must correspond to numerical value 360000.
The actual value weighting factor (AVWF) is therefore as follows:
56251.37329101
2
360000
AVWF
18
==
The calculation produces a number with 12 decimal places which can
only be accurately represented by specifying the factor as a fraction.
The actual value weighting factor has 3 integer places and 8 decimal
places in two separate components.
Actual Value Weighting Factor
Integer places
3-digit P169
Decimal places
8-digit P170
0
to
999
0
to
99999999
If you want to work in encoder increments instead of physical units, the
actual value weighting factor (AVWF) should be set to 1.0. This is
recommended, for example, for pure synchronization axes.
The following example calculates the actual value weighting factor
(AVWF) for an application in which a motor drives a toothed belt via a
gearbox and a drive roller.
Slide
Motor
Gearbox
i = 1:10
Drive roller
Fig. 9-14
After the AVWF factor has been charnged, the converter has to be re-
initialized (switch the unit off and on again).
AVWF factor with
inte-
ger/decimal places
NOTE
Example:
Determining the
AVWF for a linear
axis
CAUTION
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