Efficient Networks Siemens Sinamics S120 - Manual (Page 282)

Function modules
7.10 DCC axial winder
Drive Functions
282
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
● Signal level 1 at binector input p2551 "signal setpoint static".
Reference point set (r2684.11)
The signal is set as soon as referencing has been successfully completed. It is deleted as
soon as no reference is there or at the start of the reference point approach.
Acknowledgement, traversing block activated (r2684.12)
A positive edge is used to acknowledge that in the mode "traversing blocks" a new traversing
task or setpoint was transferred (the same signal level as binector input p2631 activate
traversing task). In the mode "direct setpoint input / MDI for setting-up/positioning" a positive
edge is used to acknowledge that a new traversing task or setpoint was transferred (the
same signal level as binector input p2650 "edge setpoint transfer", if the transfer type was
selected using a signal edge (binector input p2649 "0" signal)).
Velocity limiting active (r2683.1)
If the actual setpoint velocity exceeds the maximum velocity p2571 - taking into account the
velocity override - it is limited and the control signal is set.
7.10 DCC axial winder
Description
The "DCC axial winder" functionality covers a wide variety of winder applications.
With a suitable setup, the function enables a winder or unwinder for a wide variety of
applications, such as film plants, printing machines, coating plants, coil winders for wire-
drawing machines or textile machines.
An axial winder solution usually comprises a winder drive, a continuous web and possibly
sensors. The axial winder serves to wind or unwind a continuous web with a defined tension.
The winder diameter will change during the winding process. The product thickness
increases or decreases during the winding or unwinding process. The drive system
calculates the current diameter on the basis of system variables and influences the speed or
torque, depending on the application, so that the tension and velocity of the web is
maintained according to specifications. This requires the current velocity of the web and the
rotational speed of the winder axis to be known.
Features
● Different winding and control methods can be applied, e.g. direct closed-loop tension
control through
speed correction or torque limiting and indirect closed-loop tension control
● Closed-loop control can be implemented through "Tension controller acting on torque
limits" or
"Tension controller acting on speed setpoint"