Sf-# Special Functions - GE AF-650 GP Programming Manual

Parameter Descriptions

3.23 SF-# Special Functions

3.23.1 SF-## Wobble Function
The wobble function is primarily used for synthetic yarn
winding applications. The wobble option is installed in the
frequency converter controlling the traverse frequency
converter. The yarn moves back and forth in a diamond
pattern across the surface of the yarn package. To prevent
a build-up of yarn at the same points at the surface, this
pattern must be altered. The wobble option can
accomplish this by continuously varying the traverse
velocity in a programmable cycle. The wobble function is
created by superimposing a delta frequency around a
center frequency. To compensate for the inertia in the
system, a quick frequency jump can be included. Suitable
for elastic yarn applications, the option features a
randomized wobble ratio.
Illustration 3.50 Wobble Function
SF-00 Wobble Mode
Option: Function:
NOTICE
This parameter cannot be adjusted while
the motor runs.
The standard speed open-loop mode in
parameter H-40 Configuration Mode is extended
with a wobble function. In this parameter, it is
possible to select which method to be used for
the wobbler. Set the parameters as absolute
values (direct frequencies) or as relative values
(percentage of other parameter). Set the
wobble cycle time as an absolute value or as
independent up and down times. When using
an absolute cycle time, the up and down times
are configured through the wobble ratio.
[0] Abs. Freq.,
Abs. Time
*
[1] Abs. Freq.,
Up/ Down
Time
[2] Rel. Freq.,
Abs. Time
DET-618D
AF-650 GP™ Programming Guide
SF-00 Wobble Mode
Option:
[3] Rel. Freq.,
Up/ Down
Time
3.23.2 Center Frequency
Use parameter group to set the center frequency.
SF-01 Wobble Delta Frequency [Hz]
Range:
5 Hz
*
25 Hz]
SF-02 Wobble Delta Frequency [%]
Range:
25 %
*
100 %]
SF-03 Wobble Delta Freq. Scaling Resource
Option:
[0] No function
*
[1] Analog Input 53
[2] Analog Input 54
[3] Frequency input 29
[4] Frequency input 33
[7] Analog Input X30/11
[8] Analog Input X30/12
[12] Analog Input X49/1
[13] Analog Input X49/3
[14] Analog Input X49/5
SF-04 Wobble Jump Frequency [Hz]
Range:
0 Hz
*
20.0 Hz]
02/2016 All rights reserved.
Function:
Function:
[0 - The delta frequency determines the magnitude of
the wobble frequency. The delta frequency is
superimposed on the center frequency.
Parameter SF-01 Wobble Delta Frequency [Hz]
contains both the positive and negative delta
frequency. The setting of parameter SF-01 Wobble
Delta Frequency [Hz] must thus not exceed the
setting of the center frequency. The initial ramp-
up time from standstill until the wobble sequence
runs is determined.
Function:
[0 - The delta frequency can also be expressed as
percentage of the center frequency and can
thus be maximum 100%. The function is the
same as for parameter SF-01 Wobble Delta
Frequency [Hz].
Function:
Select which frequency converter
input should be used to scale the
delta frequency setting.
Function:
[0 - The jump frequency is used to compensate for
the inertia in the traverse system. If a jump in
the output frequency is required at the
boundaries of the wobble sequence, the
frequency jump is set in this parameter. If the
traverse system has a very high inertia, a high
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