6
11
KEB COMBIVERT F4-C
10
Name: Basis
30.01.98
Functional Description
PI-Controller
©
KEB Antriebstechnik, 1997
All Rights reserved
Chapter
Section
Page
Date
cn31Digital Diameter setting
0,0%...100,0 %
±REF_int.
REF_int.
Option_int.
cn.30 Source Diameter correction
0
1
2
3
4
off
100
fPreset=
fRamp
1+DS (1/cn.32-1)
DS = 0...100%
fRamp
t
%
cn.33
fPreset
Picture 6.11.6
Diameter compensation
6.11.6 Diameter Compensation
By the use of the diameter compensation the feedrate of the wrapping material can
be maintained constant while the diameter of the winding bale changes. For this
purpose the diameter of the winding bale must be preadjusted. The source, from
which the program receives the information about the actual diameter, is selected
with cn.30. Following sources are possible:
cn.30 Source diameter compensation
0
OFF
No correction (diameter signal = 0%)
1
REF±
Diameter signal via REF±
2
REF
Diameter signal via REF
3
AN-OPT
Diameter signal via the optional analog channel
4
cn.31
Diameter signal via cn.31
The diameter signal is evaluated in the range of 0% up to 100 %. Values< 0% are set
to 0%, values > 100% are limited to 100%.
A diameter signal of 0% corresponds to the minimum diameter of the winding bale
(d
min
). In this case the output frequency of the ramp generator is not changed. A
diameter signal of 100% corresponds to the maximum diameter of the winding bale
(d
max
). To calculate the frequency change the program requires the relation of minimum
to maximum diameter (d
min
/d
max
).
Through cn.31 the diameter signal can be set digital in the range of 0…100%.
The relation of minimum to maximum diameter (d
min
/d
max
) is set with cn.32 and
adjustable in the range of 0,01…0,99 with a resolution of 0,001.
The corrected output frequency of the ramp generator is calculated as follows:
f_Preset =
f_Ramp
1+DS 1 cn 32 -1
•( / .
)
f_Ramp:
Output frequency of ramp generator
f_Setting:
Corrected output frequency
DS:
Diameter signal 0 - 100% (0 to 1)
cn.32:
(d
min
/d
max
)
Source diameter compensation
(cn.30)
Diameter relation (cn.32)
Digital diameter setting (cn.31)