Lenze 9400 - Manual (Page 37)

Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
37
4 Drive interface
4.1 Machine parameters
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4.1.8 Resolution of an encoder revolution
The following applies to software versions lower than V3.0:
The resolution of an encoder revolution and hence of a position value is constantly set to 16 bits/
revolution, which corresponds to 65536 increments/revolution. At this resolution, the traversing
range comprises ±32767 revolutions.
The following applies from software version V3.0:
C00100
serves to adjust the resolution to the application.
• The default resolution of 16 bits/revolution is sufficient for standard applications.
[4-10] Example: standard resolution (16 bits/revolution)
• For more significant applications, a higher resolution of the position values can clearly improve
the control properties and positioning accuracies:
• Finer resolution of the position targets  improved positioning accuracy
• Finer quantisation of setpoints and actual values  better control quality
• Higher loop gain adjustable  less following errors
• However, a higher resolution at the same time causes a restricted number of encoder
revolutions, and only smaller traversing distances can be displayed.
[4-11] Example: Higher resolution (22 bits/revolution) with a restricted traversing range

Tip!
In the following subchapter "
Determining the optimum resolution " ( 39) it is described
how you can determine the optimum resolution of the position values.
 Sign bit
 Number of revolutions: 15 bits ≡ ±32767 revolutions
 Resolution of one encoder revolution: 16 bits ≡ 65536 increments/revolution
%LW
 Sign bit
 Number of revolutions: 9 bits ≡ ±512 revolutions
 Resolution of one encoder revolution: 22 bits ≡ 4194304 increments/revolution
%LW