Danfoss VLT AutomationDrive FC 300 Programming Manual page 226

FC 300 Programming Guide
3.20 Parameters: 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.
30-00 Wobble Mode
Option:
[0] * Abs. Freq., Abs. Time
[1] Abs. Freq., Up/ Down Time
[2] Rel. Freq., Abs. Time
[3] Rel. Freq., Up/ Down Time
This parameter can be set while running.
NB!
The setting of "Center Frequency" takes place via the normal reference handling parameters, 3-1*
30-01 Wobble Delta Frequency [Hz]
Range:
5.0 Hz* [0.0 - 25.0 Hz]
Function:
The standard speed open loop mode in par. 1-00 is extended with a wobble function . In this pa-
rameter it is possible to select which method to be used for the wobbler. The frequency parameters
can be set as absolute values (direct frequencies) or as relative values (percentage of other pa-
rameter) . 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.
Function:
The delta frequency is determining the magnitude of the wobble frequency. The delta frequency is
superimposed on the center frequency. Parameter 30-01 is selecting both the positive and negative
delta frequency. The setting of parameter 30-01 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 parameters 3-1*.
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3 Parameter descriptions
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