Parameters: 30-** Special Features - Danfoss VLT AutomationDrive FC 301 Programming Manual

Parameter Descriptions

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 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. Especially suitable
for elastic yarn applications the option features a
randomized wobble ratio.
Frequency
[Hz]
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
CENTER FREQ
Par. 30-10: [RATIO T
Par. 30-08: [INDEPENDENT UP and DOWN]
Illustration 3.63 Wobble Function
30-00 Wobble Mode
Option: Function:
NOTICE
This parameter cannot be
adjusted while running.
The standard speed open loop mode in
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. 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
®
VLT AutomationDrive FC 301/302 Programming Guide
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
T T
UP
DOWN
/ T ]
UP DOWN
Time [s]
MG33MH02 - Rev. 2013-09-30
30-00 Wobble Mode
Option: Function:
[2] Rel. Freq.,
Abs. Time
[3] Rel. Freq.,
Up/ Down
Time
NOTICE
The setting of "Center Frequency" takes place via the
normal reference handling parameter group, 3-1*
References.
30-01 Wobble Delta Frequency [Hz]
Range: Function:
5 Hz [0 - The delta frequency is determining the magnitude
*
25 of the wobble frequency. The delta frequency is
Hz] superimposed on the center frequency.
30-01 Wobble Delta Frequency [Hz] is selecting both
the positive and negative delta frequency. The
setting of 30-01 Wobble Delta Frequency [Hz] 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* References.
30-02 Wobble Delta Frequency [%]
Range: Function:
25 % [0 - The delta frequency can also be expressed as
*
100 %] percentage of the center frequency and can
thus be maximum 100%. The function is the
same as for 30-01 Wobble Delta Frequency [Hz].
30-03 Wobble Delta Freq. Scaling Resource
Option: Function:
Select which frequency converter
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 Hz [ 0 - The jump frequency is used to compensate for the
*
20.0 inertia in the traverse system. If a jump in the
Hz] 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
3 3
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