Function modules

7.10 DCC axial winder

DEN

SCL

 

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n2

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n2:

 

 

 

Mb

 

 

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GF = n1/n2 *HDUUDWLR

Figure 7-21 Axial winder setup

Functional principle

To maintain a constant tension of the continuous web, the drive moment is increased in a linear manner while the winding diameter increases, or decreased while the winding diameter decreases.

To protect the winding material during the winding process, the tension is reduced according to a characteristic curve when the winding diameter increases.

The calculation of the continuously changing moment of inertia permits a torque pre-control during a steady decrease or increase of the winder speed.

By using a sensor, a speed controlled operation of the winder is possible. The winder can be operated without an encoder by controlling the tension moment, with two scaling parameters p1552 and p1554 for tension moment limitation (see torque limitation).

Calculation of the moment of inertia for torque pre-control

The function diagram below shows the calculation flow for SERVO control with encoder [FP

5042] / without encoder [FP 5210]:

 

 

 

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dn/dt

 

 

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p1497

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Figure 7-22 Torque pre-control for SERVO control

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284

Drive Functions

Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

Page 284
Image 284
Efficient Networks S120 manual Calculation of the moment of inertia for torque pre-control, Dn/dt