TECHNICAL INSIGHT
Water-cooled multi-motor drive for a complete paper machine Author: Michael Herold, Sales Manager Fiber Industry, Siemens Energy
ENTIRE MULTI-MOTOR DRIVE REPLACED IN NINE DAYS
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n April 2018 Siemens put a water-cooled multi-motor drive into operation for Progroup, one of the leading manufacturers of containerboard and corrugated board in Europe. While their paper mill PM1 in Burg near Magdeburg (Germany) was down for ten days for the installation, the opportunity was taken to migrate and combine what had been separate operating areas into the PCS 7 SIPAPER process control system at the same time. The drive system used in the multi-motor drive at PM1 had been running reliably for more than 15 years. To both improve machine speed and enable the mill to maintain its very high availability level into the future, Progroup replaced the multi-motor drive of the air-cooled Masterdrive converter ith efficient, innovative ater cooled converters. This forward planning means PM1 is already prepared for future performance enhancements.
MULTI-MOTOR DRIVE WITH 13 MW INSTALLED DRIVE POWER With about 41 drive circuits, the new multi-motor drive includes both the variable drives in the pa-
per machine and the pump drives. System compatibility ensured the feed-in points, motors, and most of the cabling could be reused, although selected drives were replaced as a preventive measure or to improve performance. As a precaution, nanocrystalline toroidal tape cores ere fitted to the outputs of both the inverters and converters to protect the motors against bearing currents. At PM2, its sister paper mill in EisenhĂźttenstadt, Progroup has had very good experience with the proven Siemens SINAMICS S120 CM (Cabinet Module) converter series, since the high levels of dynamism and control accuracy of this series make it possible to achieve the drive parameters needed for the paper machine. Progroup also decided to utilize this innovative drive solution for , and ta e full advantage of the benefits of the water-cooled frequency converters at the same time. The presence of a cooling plant for the raw water connection on-site made it easier to set up the converter plant ith energy efficient water cooling. The entire water-cooling system is configured ith redundancy n the event of failure or when required for maintenance purposes, the redundant system automatically takes over. The new, space-saving cabinet arrangement and direct heat dissipation via the water circuit substantially reduced heat losses in the switchgear room.
PAPERFIRST MAG Autumn 2020
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