Parameters: 30-** Special Features - Danfoss VLT AutomationDrive FC 302 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
3 3
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)
CENTER FREQ
Illustration 3.63 Wobble Function
30-00 Wobble Mode
Option:
[0] Abs. Freq.,
Abs. Time
*
[1] Abs. Freq.,
Up/ Down
Time
[2] Rel. Freq.,
Abs. Time
168
VLT
Par. 30-07: WOBB TIME
Par. 30-06: JUMP TIME
Par. 30-04 [Hz]: JUMP FREQ
Par. 30-09 [%] : JUMP FREQ
Par. 30-01 [Hz]
Par. 30-02 [%]
(Par. 30-03:)
Par. 30-09: RANDOM FUNC
Par. 30-*1: RAMP UP
Par 30-11: RANDOM MAX
Par 30-12: RANDOM MIN
T
DOWN
Par. 30-10: [RATIO T / T ]
UP DOWN
Par. 30-08: [INDEPENDENT UP and DOWN]
Function:
NOTICE
This parameter cannot be adjusted while
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. 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.
®
AutomationDrive FC 301/302 Programming Guide
30-00 Wobble Mode
Option:
[3] Rel. Freq.,
Up/ Down
Time
3.20.2 Center Frequency
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:
5 Hz [0 -
*
25
Hz]
T
UP
Time [s]
30-02 Wobble Delta Frequency [%]
Range:
25 % [0 - 100
*
%]
30-03 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
[15] Analog Input X48/2
30-04 Wobble Jump Frequency [Hz]
Range:
0 Hz [ 0 -
*
20.0
Hz]
MG33MI02 - Rev. 2013-11-20
Function:
Function:
The delta frequency is determining the magnitude
of the wobble frequency. The delta frequency is
superimposed on the center frequency.
parameter 30-01 Wobble Delta Frequency [Hz] is
selecting both the positive and negative delta
frequency. The setting of parameter 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.
Function:
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 30-01 Wobble Delta
Frequency [Hz].
Function:
Select which frequency converter
input should be used to scale the
delta frequency setting.
FC 302 only
Function:
The jump frequency is used to compensate for
the inertia in the traverse system. If a jump in