Functions 09.2008
6SE7087-6QX70 (Version AK) Siemens AG
7-24 Compendium Motion Control SIMOVERT MASTERDRIVES
7.2.3.2 Normalization
The purpose of normalization is to establish the relationship between
the mechanical (e.g. mm) and electronic (LU) representation.
In positioning, the path dimension unit is called a LENGTH
UNIT LU.
This means that LU can be mm, inches, degrees, etc.
LU = LENGTH UNIT is a neutral length dimension.
d
Gearbox
Motor
Roller
1 : 10
X max
x = Roller circumference
d
Backlash
Reference mark
Fig. 7-7 Typical positioning application
The arrangement shown in Fig. 7-7.
The factory setting values are pure motor-related normalizations.
Example:
Encoder: 131 072 pulses per motor revolution [resolution in 2
n
(n = 17)]
with a gearbox having 1:10.00 ratio (i), this gearbox factor must be
included in the calculation.
131072 x 10 = 1 310 720 pulses per roller revolution
The diameter of the drive roller (d) is 300.000 mm
mm 942.4771415.3mm 300dx
=π×=
The following is to be represented: 1LU = 1 µm
The circumference of the roller (x) is therefore 942477 LU.
NOTE
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