3.20 Parameters: 30-** Special Features
3.20.1 30-0* Wobble Function
The wobble function is primarily used for synthetic yarn
winding applications. The wobble option is to be installed in
the frequency converter controlling the traverse drive. The
traverse drive frequency converter will move the yarn back
and forth in a diamond pattern across the surface of the yarn
package. To prevent a buildup 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. Especially suitable for
elastic yarn applications the option features a randomized
wobble ratio.
175ZB001.10
Par. 30-09: RANDOM FUNC
Par 30-11: RANDOM MAX
Par 30-12: RANDOM MIN
T
DOWN
T
UP
Par. 30-06: JUMP TIME
Par. 30-04 [Hz]: JUMP FREQ
Par. 30-09 [%] : JUMP FREQ
CENTER FREQ
Par. 30-07: WOBB TIME
Frequency
[Hz]
Time [s]
Par. 30-01 [Hz]: DELTA FREQ.
Par. 30-02 [%]: DELTA FREQ.
(Par. 30-03)
Par. 30-01 [Hz]
Par. 30-02 [%]
(Par. 30-03:)
Par. 30-*1: RAMP UP
Par. 30-10: [RATIO T
UP
/ T
DOWN
]
Par. 30-08: [INDEPENDENT UP and DOWN]
30-00 Wobble Mode
Option:
Function:
The standard speed open loop mode in
is extended with a
wobble function. In this parameter it is
possible to select which method to be used
for the wobbler. The parameters can be set as
absolute values (direct frequencies) or as
relative values (percentage of other
parameter). The wobble cycle time can be set
as an absolute alue 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
[3]
Rel. Freq., Up/
Down Time
NOTE
This parameter cannot be set while running.
NOTE
The setting of “Center Frequency” takes place via the normal
reference handling parameter group, 3-1*
30-01 Wobble Delta Frequency [Hz]
Range:
Function:
5.0
Hz
*
[0.0 -
25.0 Hz]
The delta frequency is determining the
magnitude of the wobble frequency. The delta
frequency is superimposed on the center
frequency.
30-01 Wobble Delta Frequency [Hz]
is
selecting both the positive and negative delta
frequency. The setting of
must thus not be higher than the
setting of the center frequency. The initial ramp
up time from standstill until the wobble
sequence is running is determined by parameter
group 3-1*.
30-02 Wobble Delta Frequency [%]
Range:
Function:
25 %
*
[0 - 100 %] 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
.
30-03 Wobble Delta Freq. Scaling Resource
Option:
Function:
Select which drive input should be
used to scale the delta frequency
setting.
[0]
*
No function
[1]
Analog input 53
[2]
Analog input 54
[3]
Frequency input 29
FC 302 only
[4]
Frequency input 33
[7]
Analog input X30/11
[8]
Analog input X30/12
[15] Analog Input X48/2
30-04 Wobble Jump Frequency [Hz]
Range:
Function:
0.0
Hz
*
[Application
dependant]
The jump frequency is used to compensate
for the inertia in the traverse system. If a
jump in the output frequency is required in
the top and in the bottom of the wobble
sequence, the frequency jump is set in this
parameter. If the traverse system has a very
high inertia a high jump frequency may
create a torque limit warning or trip
(warning/alarm 12) or an over voltage
warning or trip (warning/alarm 7). This
parameter can only be changed in stop-
mode
Parameter Descriptions
FC 300 Programming Guide
MG.33.MB.02 - VLT
®
is a registered Danfoss trademark
159
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