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AFP equipment is configured as post mills or lathe type machines that can only access. performance closed loop PID tension control system (Figure 5). Figure 6 AFP Head Spool, Backing Film Takeup amp; Dancer Configuration. and tear on the machine components such as bearing cars, rails, ball screws, rack and.
As the originators of the first dancer controller to utilize feedback from both a dancer arm and load cells, we understand the unique control requirements of applications utilizing dancers. Montalvos Dancer Tension Controllers give you the precise, accurate, and repeatable tension control required for more productive and profitable runs.
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Because dancers are position controllers, theycannot read tension values and require a more complicated algorithm to translatetension values into positioning of dancer control systems Disadvantages of dancer control systemsEasy to set up Difficult to design mechanicallyAbility to accumulate web; more No direct capability of measuring andforgiving of variation in
In a closed loop dancer unwind system, there are several key components: the dancer itself, a feedback potentiometer, a control, and the brake or drive. The goal in a dancer system is for the dancer to remain at the midpoint of travel. Pressure on the dancer establishes the tension for the web. The brake in the system controls how fast material is allowed to unwind. Brake pressure changes
independent tension controls are used in each zone, each zone may have its own tension level. This means, for example, If your machine has dancers, you can calculate the loading of the dancer on the web if you know the web geometry and the loading force on the dancer.
Use a torque device to control tension Summary (dos and donts) Make sure web does not slip through nips Dont use manual controls on center unwinds Beware of diameter calculator controls For indexing or outofround roll applications use a dancer system Dont control tension on the device setting line speed
monthly rate. The data was obtained from the automatic control system of the circuits. As can be seen, the vertical mill consistently presented lower net specific energy consumption than the ball mills which operate on the same circuit. The averages were, and kWh/t respectively for ball mill 01, ball mill 02 and vertical mill.
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n Full PID loop adjustment and system gain adjustment for optimum control. n Available in open frame or enclosed wall/ shelf mount enclosure. TCS210 Dancer Control The TCS210 automatically controls web tension through a dancer roll and position sensor. It outputs to an Electro Disc or other electromagnetic tension brake. See page 50.
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A dancer roll tension control system can use the principle of inertia compensation to absorb upsets in tension while keeping web tension consistent throughout the process. Engineers can create inertia compensation by balancing the inertias of the upanddown motions of the dancer
More advanced control systems use tension meters (Zhao et al., 2008) to measure the current strip tension. Choi et al. (2007a) advocate the use of linear model predictive control (MPC) for loopers and strip Strip Mill stand Looper Fig. 1. Tandem rolling mill with ve mill stands. tension as this control approach facilitates a systematic
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