Danfoss VLT 500 Installation guide
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Introduction
The wobble function is primarily used for synthetic
yarn winding applications. The wobble option is to be
installed in the VLT controlling the traverse drive. The
traverse drive VLT 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.
Parameter description
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The „Center Frequency“ setting
is no longer in Par. 701 and therefore
also no longer limited to 120Hz.
The setting of „Center Frequency“ now takes place
via the normal reference handling parameters 200 to
205 (see manual MG.51.Ax.xx, pages 60 and 94-95).
VLT® Series 5000 Wobble function
The wobble function is created by superimposing a
delta frequency around a center frequency. To compensate for the inertia in the system a quick fre
quency jump can be included. Especially suitable for
elastic yarn applications the option features a randomized wobble ratio.
100 Configuration (CONFIG. MODE )
Value:
✭ Speed regulation, open loop
(SPEED OPEN LOOP) [0]
Speed regulation, closed loop
(SPEED CLOSED LOOP) [1]
Process regulation, closed loop
(PROCESS CLOSED LOOP) [3]
Torque regulation, open loop
(TORQUE OPEN LOOP) [4]
Torque regulation, speed feedback
(TORQUE CONTROL SPEED) [5]
MI.50.J2.02 - VLT is a registered Danfoss trademark
Function:
The parameter is used for selecting the
configuration to which the VLT frequency converter is
to be adapted. This parameter is identical to
parameter 100 in the standard VLT5000 software.
Description of choice:
The wobble function can be active only by selecting
Speed, open loop mode [0]. The wobble option
parameters: 700 - 709 are not visible in the other
modes.
1
VLT® Series 5000 Wobble function
700 Wobble mode (WOBB MODE)
Value:
✭ Wobble mode OFF (OFF) [0]
Wobble mode ON (ON) [1]
Function:
The standard speed open loop mode set in
parameter 100 is extended with a wobble function. In
this parameter it is possible to select or deselect the
wobble function. Deselecting the wobble function
makes the drive operate in the standard speed open
loop mode.
Description of choice:
Select OFF [0] to disable the wobble function. The
speed open loop mode acts as in the standard
VLT5000 software.
Select ON [1] to enable the wobble function.
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ning:
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W
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This parameter can be set while running.
703 Jump frequency (JUMP FREQ)
Value:
0.0 - 25.0 Hz ✭ 0.0Hz
Function:
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
Description of choice:
The frequency is specified in Hertz.
704 Jump time (JUMP TIME)
Value:
0 - 50 ms ✭ 0 ms
NB!
The “Center Frequency” setting is no longer
in Par. 701 and therefore also no longer
limitedto 120 Hz. The setting of “Center Frequency”
now takes place via the normal reference
handling parameters 200 to 205 (see manual
MG.50.A9.xx, pages 60 and 94-95).
702 Delta frequency (DELTA FREQ)
Value:
0.0 - 20.0 Hz ✭ 5.0Hz
Function:
The delta frequency is determining the magnitude of
the wobble frequency. The delta frequency is
superimposed on the center frequency. Parameter
702 is selecting both the positive and negative delta
frequency. The setting of parameter 702 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 207.
Function:
This parameter determines the slope of the jump
ramp at the maximum and minimum wobble
frequency.
This parameter can only be changed in stop-mode.
Description of choice:
The time is specified in milliseconds.
705 Wobble time (WOBBLE TIME)
Value:
0.0 - 1000.0 s ✭ 10.0 s
Function:
This parameter determines the wobble sequence
period.
This parameter can only be changed in stop-mode.
Wobble time = t
up
+ t
down
Description of choice:
The time is entered in seconds.
Description of choice:
The frequency is specified in Hertz.
2
MI.50.J2.02 - VLT is a registered Danfoss trademark
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