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Automation Technologies 5/2014

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Automation Technologies 5/2014

Control and drive

Control and drive technology Shortened engineering time with Rexroth and Sercos A printing system integrates frameless motors, regenerative drives, an advanced controller platform and linear motion components for a sophisticated press that provides more productivity and excellent print quality. Optimized connectivity is guaranteed by use of the Sercos bus. Paper Converting Machine Company (PCMC) of Green Bay, WI, is a global leader in tissue converting, packaging, flexographic inline tag and label printing, and nonwovens and envelope technology. As PCMC began developing a new generation of presses, the company sought to satisfy several customer requirements – most of which focused on reducing the factors that affect printers‘ productivity and competitiveness like changeover time or energy consumption. To satisfy these requirements, PCMC integrated a range of electric drives, controls and linear motion products from Bosch Rexroth into the new Fusion Flexographic System. Shortened engineering time – high diagnostic level The PCMC Fusion Flexographic printing press is an all servo-driven platform that includes up to 21 axes

Control and drive technology next page for a ten-color press, or 17 axes for an eight-color machine. There are also seven axes for web conveyance and tension control from the unwind axis to the rewind axis. All axes are connected to the Rexroth control system via the highly synchronous Sercos bus. The Rexroth drive and control systems powering the Fusion press include IndraDrive M servo drives with regenerative and DC bus sharing capabilities and IndraDyn T frameless torque motors, all controlled by the IndraMotion MLC motion logic controller. IndraMotion for Printing provides a full range of pre-engineered technology function blocks to solve the most complex printing and converting application. Implementation of these proven algorithms shortens engineering time and minimizes field support typical with implementation of new control algorithms. The easy configuration and the high diagnostic level of the Sercos automation bus reduces engineering efforts during start-up and commissioning. The service computer can be connected to any free port of the Sercos communication system having access to all the Sercos nodes via the Unified Communication Channel (UCC) without affecting the real-time behavior of the bus at any time. The redundant ring architecture of Sercos with auto-healing means that an interruption in communication anywhere in the bus will not cause an interruption in motion, and redundancy will be restored 02 The regenerative drives enable the Fusion to operate with increased efficiency automatically as soon as the cause of the interruption is removed. Advanced diagnostics further allow the location of a break to be determined so that this location can be examined for loose or faulty cables, etc. Reducing setup time Changeovers were the first area the development team focused on: Reducing changeover time when a new job is put up on the press adds to profitable printing time. Each Fusion system consists of a large central impression cylinder, eight to ten feet in diameter, radially surrounded by eight or ten printing “decks” 01 The control system helped to speed up commissioning time and to reduce non-productive changeover time AUTOMATION TECHNOLOGIES 5/2014

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