Siemens SINAMICS S120 Function Manual page 552

Applications
11.6 DCC axial winder
1. TTCU block: Winding hardness diagram
2. DCA block: Diameter calculator:
3. INCO block: Dynamic calculation of the moment of inertia for torque pre-control and Kp
The block calculates the mass moment of inertia of an axial winder, referred to the motor
side. In addition to the diameter (from DCA), the block also contains information on the
Figure 11-6
Operating 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).
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The block is applied for defining the tension setpoint as a function of the current winder
diameter. The setpoint is adjusted according to a selectable characteristic curve.
The DCA (Diameter Calculator) is used to determine the current diameter of an axial
winder based on the path velocity and the motor speed. The calculated diameter is
checked for plausibility.
adaptation of the speed controller
(see figure "Axial winder setup", abbreviations refer to block description).
geometry and material properties of the winder and the winding product.
The static mass moment of inertia referred to the motor side is passed to the DCC block
via the parameter r1493. The result is fed back to the basic system via the scaling
parameer p1497 (referred to the static moment of inertia).
DEN
OFS
M
b
Axial winder setup
DMIN
SCL
D
n
2
DMAX
n :
1
GF = n /n
1 2
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
V
W
n :
1
n :
2
M :
b
Drive functions