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Danfoss VLT 5000 Series User manual

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VLT

Drives and Controls
VLT


Frequency Converter
Series 5000
Wobble function
Instruction
MI.50.J1.02 - VLT is a registered Danfoss trademark *MI50J102*
MI.50.J1.02 - VLT is a registered Danfoss trademark
2
VLT®Series 5000 Wobble function
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 continu
ously varying the traverse velocity in a programmable
cycle.
The wobble function is created by superimposing a
delta frequency around a center frequency. To com
pensate for the inertia in the system a quick fre
quency jump can be included. Especially suitable for
elastic yarn applications the option features a ran
domized wobble ratio.
Parameter description
■
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]
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.
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.
WW
WW
Warar
arar
arning:ning:
ning:ning:
ning:
This parameter can be set while running.
3
MI.50.J1.02 - VLT is a registered Danfoss trademark
VLT®Series 5000 Wobble function
701 Center frequency (CENTER FREQ)
Value:
0.0 - 120.0 Hz ✭25.0Hz
Function:
The center frequency of the wobble sequence is
specified in this parameter.
Description of choice:
The center frequency is specified in Hertz. The output
frequency can not exceed the setting of parameter
200.
704 Jump time (JUMP TIME)
Value:
0 - 50 ms ✭0 ms
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.
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 parameter 701.
The initial ramp up time from standstill until the
wobble sequence is running is determined by
parameter 207.
Description of choice:
The frequency is specified in Hertz.
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.
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 = tup + tdown
Description of choice:
The time is entered in seconds.
706 Wobble ratio (WOBB RATIO)
Value:
0.1 - 10 ✭1
Function:
The ratio between the up time versus the down time
of the wobble sequence is specified in this parameter.
Wobble ratio = tup/tdown,
This parameter can only be changed in stop-mode.
Description of choice:
If the ratio 0.1 is selected:
tdown is 10 times greater than tup.
If the ratio10 is selected:
tup is 10 times greater than tdown.
MI.50.J1.02 - VLT is a registered Danfoss trademark
4
VLT®Series 5000 Wobble function
707 Random function (RANDOM FUNC)
Value:
✭OFF (OFF) [0]
ON (ON) [1]
Function:
This parameter enables a randomized wobble ratio
function. The wobble ratio in parameter 706 is not
active if the random function is enabled.
Description of choice:
Select OFF [0] to disable the random function and use
the wobble ratio set in parameter 706.
708 Random ratio max (RANDOM MAX)
Value:
0.1 - 10 ✭1
Function:
This parameter determines the maximum wobble ratio
which the random function is allowed to choose.
Description of choice:
Enter the maximum allowed wobble ratio.
709 Random ratio min (RANDOM MIN)
Value:
0.1 - 10 ✭1
Function:
This parameter determines the minimum wobble ratio
which the random function is allowed to choose.
Description of choice:
Enter the minimum allowed wobble ratio.
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material.
Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such
alterations can be made without subsequential changes being necessary in specifications already agreed.
© Danfoss Drives A/S (DD-MT2) 09.97 DTP L9
175R0891 MI.50.J1.02