4.20 Parameter Group 30-** Special Features
4.20.1 30-0* Wobble Function
The wobble function is primarily used for synthetic yarn winding applications. The wobble option is installed in the drive controlling
the traverse drive. 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.
T
DOWN
T
UP
e7
5z
b0
01
.1
1
Frequency
[Hz]
Par. 30-01 [Hz] Delta Freq.
Par. 30-02 [%]: Delta Freq.
(par. 30-03)
Center freq.
Par. 30-01 [Hz]
Par. 30-02 [%]
(par. 30-03)
Par. 30-*1 Ramp Up
Par. 30-07: Wobb Time
Par. 30-06: Jump Time
Par. 30-04 [Hz]: Jump Freq
Par. 30-09 [%]: Jump Freq
Par. 30-09: Random Func
Par. 30-11: Random Max
Par. 30-12: Random Min
Par. 30-10: [Ratio T
up
/T
down
]
Par. .30-08: [Independent up and down]
Time [s]
Illustration 87: Wobble Function
Parameter 30-00 Wobble Mode
Table 693: Parameter 30-00 Wobble Mode
30-00 Wobble Mode
Default Value: [0] Abs. freq., abs. time
Parameter Type: Option
Setup: All set-ups
Conversion Index: -
Data Type: Uint8
Change during operation: False
N O T I C E
This parameter cannot be changed while the motor is running.
The standard speed open-loop mode in
parameter 1-00 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 rela-
tive 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.
Option
Name
Description
[0]*
Abs. freq., abs. time
[1]
Abs. freq., up/down time
[2]
Rel. freq., abs. time
[3]
Rel. freq., up/down time
Parameter 30-01 Wobble Delta Frequency [Hz]
Table 694: Parameter 30-01 Wobble Delta Frequency [Hz]
30-01 Wobble Delta Frequency [Hz]
Default Value: 5 Hz
Parameter Type: Range, 0 - 25 Hz
Setup: All set-ups
Conversion Index: -1
Data Type: Uint8
Change during operation: True
AU373327181955en-000101 / 130R1208
334 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide