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| Papier und Kartonfabrik Varel GmbH und Co. KG.; Varel (Germany) | | Making paper with Sinamics | New drive concept for paper machines
With about 1200 m/min, converted 72 km/h, the paper races over the rollers, waltzers and winders. To avoid the web tearing at this speed and to guarantee a consistent paper quality, the drives of the new paper machine of the paper and cardboard factory Varel GmbH & Co KG must bring top performance. The new Siemens drive series Sinamics takes over all drive jobs as a homogeneous solution in the paper machine and therefore meets the high requirements.
The new paper machine PM5 of the paper and cardboard factory Varel GmbH & Co KG has been in operation since the end of 2004. With the new machine which turns waste paper into test liners and corrugated paper, the paper factory in Varel has increased its annual capacity from previously 400,000 to 650,000 t. The PM5 has a screen width of 6,250 mm and produces paper with area weights of 70 to 120 (150) g/m2, up to 850 t per day.The drive jobs in the paper machine and in the ancillary processes are performed by Sinamics devices. 58 Sinamics S120 in the "Cabinet Modules" design are used for the waltzers, presses, rollers, calendars and winders of the paper machine and the roll cutter. Here coordinate multi-motor applications dominate, partly with mains feedback. Twelve Sinamics G150 regulate the speed of the pumps and fans in the process - all single drives without mains feedback. Together all the members of the new drive family form a homogeneous technological concept from which the whole paper machine benefits. The drive systems are distinguished not only by the fact that they are quieter, more economical and smaller than the conventional technology but also simplify the engineering and HMI thanks to the uniform and simple concept. Examples are the universal engineering tools "Sizer" for the configuration and "Starter" for commissioning and diagnostics. The communication interfaces are also standardized.The uniform concept reduced the parameterization effort, simplified commissioning and now simplifies control maintenance during operation. The operating and maintenance personnel of the PM5 only had to be trained on one system and not on several as previously.Precision work of the drivesWith the exception of the ancillary processes with their individual drives for the pumps and the fans the drive concept of the paper machine consists of coordinated drives. All drives must accelerate the machine coordinated from zero to operating speed - in the PM5 1,200 m/min - without tearing the paper web. Speed deviations during production may only be one per thousand to guarantee the product qualities over a long period. The roll cutting drives must produce the same precision and dynamic. The tension control guarantees the strength of the wound roll here for example. For these demands on the multi-motor drives of the paper machine the devices of the Sinamics S120 type in the "Cabinet Modules" design are particularly suitable. These drives also master the 4-quadrant operation.Multi-motor drives according to the modular principleThe modular and scalable concept of Sinamics S120 Cabinet Modules creates high flexibility with an extensive option package. The optimum drive solution can therefore be assembled for every plant by the modular principle. Such a combination consists of a Line Connection Module for the plant-side mains feed. , Infeed Modules which may be designed as Basic, Smart and Active Infeed depending on the operating requirements (2, 4-quadrant operation) and required mains quality and the Motor Modules which regulate the speed and torque of the connected motors. Any module combinations are possible depending on the plant-specific requirements. The individual cabinet modules can be connected and assembled quickly by standardized interfaces. The DC coupling of the Cabinet Modules by uniform interfaces, the data-technical link by the digital interface DriveCliq. A central regulation module with Profibus connection performs the drive regulation for up to four connected drives throughout.In alternation between motorization and generatorial requirements, typical for the paper machine, the Sinamics S120 Cabinet Modules additionally save energy, offer the possibility of optimizing processes, increasing availability and reducing the feedback on the feeding mains. It is also possible to design a lower mains feed of the drive network than the powers of the individual Motor Modules operated on the common intermediate circuit.The Sinamics G150 cabinet devices for the pumps and fans are, like the Sinamics S120, clear, concisely arranged, robust and reliable, service-friendly and quiet and compact. But above all the devices are distinguished by their simple operation. Pre-configured for the drive tasks at the factory, they are very easy to commission and operate. The sophisticated, clear operating philosophy means that the user only has to concentrate on the functions that he really needs.Branch-specific regulating and control functionsWith the software standard of Sipaper Drives, Sinamics G150 and Sinamics S120 communicate with the Simatic S7-400 controllers and the factory-wide automation system. Branch-specific regulation and control functions such as setpoint cascades or load distribution are already integrated here and provide the appropriate operational reliability and availability of the drive technology. The visualization systems are adapted to the special requirements of the paper makers as standard. They include diagnostic and operating management functions such as tear analysis, felt running length monitoring or pick up without manual operation which provide decisive information already during the technological plant optimization and reduce web tears. Sensor modules evaluate motor encoder signals, collect diagnostic data and enable fast regulation of drives.In the paper machine PM5 of the Varel paper and cardboard factory Siemens was responsible for the entire electrical technology in addition to the drive technology and its automation. Additionally services such as configuration, engineering, assembly, repairs and maintenance during operation.
Advance 3 / 2005 | |
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