Example: Dancer Control - BONFIGLIOLI Vectron ACTIVE CUBE Applications Manual

Voorhout • Groningen • Weert • Hoogerheide
Limits of indirect tension control:
If the torque required for turning the empty winding mandrel is 15% higher than the torque required
for developing the minimum tension (at D
ferred.
The speed control range of the winder drive should not exceed 1:100. This means that with a winding
ratio D / D = 10, the ratio of minimum and maximum production speed should not exceed VL
max min
/ VL = 10.
min
For the tension in the web, no direct benchmark is available.
The Diameter Calculator and compensation blocks (Speed Setpoint, Tension Setpoint,
Torque Setpoint) must be adjusted very carefully to obtain the required result.
NOTE
If torque control is to be used, extreme care must be taken to ensure that the working range is al-
ways above the current impression range, i.e. the motor speed in sensor-less configurations is high-
er than the
4.2

Example: Dancer control

By changing the dancer position, the circumferential speed of the winding spool is to be adjusted to
the winding material feed rate.
By applying a force on the dancer arm, the tensile force on the web can be controlled at the same
time.
If the material is fed without tension build-up of the winder, you don't have to use the Diameter Cal-
culator and the Electronic Gear. However, both function blocks can also be used in this case as a pilot
control in order to reduce the positioning tasks of the dancer controller.
The arrangement described above also enables direct tension control. In this case, the feedback from
a tension measuring device is used for tension control. For optimum results, all pilot control options
should be used in this case.
11/13
T
), a method with direct tension control should be pre-
min
speed set in
ACU
Winding Drive
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+31(0)88 7865800
Frequency
Parameter
max
Limit
624.
23