Coal Age

MAR 2013

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Drive Technology: Always on the Safe Side Special preventive measures are needed when machines and systems operate in areas where there is an explosion risk, and SEWEurodrive GmbH & Co. KG highlights the fact that its motors and gear units meet regulatory requirements for this type of equipment as set out by ATEX in Europe, IECEx (international) and HazLoc-NA for North America. Being certified according to these standards makes them suitable for worldwide use, the company adds. With its headquarters in Bruchsal, SEW-Eurodrive has operations in around 45 countries worldwide, producing drive systems that range in application from the highly precise to bulk materials-handling. As an example of the latter, the company supplied industrial gear units to ThyssenKrupp Fördertechnik for use on two 3,900 mt/h mobile-crusher/belt wagon/conveyor systems that were recently installed for handling overburden at Vale's Carajás iron-ore operations in Brazil. From its plants in Germany and Brazil, SEW supplied 20 XM and XL gear units for the belt drives, and another four for the double-roll crushers. TKF installed 10 SEW X2P planetary gear units in the crawler drives for the crusher, belt wagon and spreader, with a further 20 PHF planetary gear units in the crusher's slew drives, the tripper-car trolleys and the apron conveyors. SEW offers gear-motors for use in potentially explosive areas according to IECEx equipment-protection levels Gb and Gc for gas protection and Db and Dc for dust protection. They also comply with ATEX requirements for categories 2G, 2GD and 3GD, and 3D for zones 1/21 and 2/22, while being available in categories 3GD and 3D as a brake-motor. The combined gas/dust approvals for its gear-motors simplify the selection process for the relevant 2013 • VDMA MINING SUPPLEMENT drive components, SEW points out, reducing the number of variants and allowing customers to use these machines in combined gas/dust zones. The company says that its explosion-proof gear units and motors are produced with special components, with particular attention being paid to quality assurance. Features include an IP54 or higher level of protection for motors in a gas environment, and protection to IP5x/IP6x for motors in dusty conditions. The gear-unit lubricant used can withstand high temperatures, with high-quality oil seals being used, while terminal boxes are made from aluminium or grey cast iron with seals that can withstand high temperatures. Units also have improved earthing, and all fixing screws are secured against unwanted loosening. SEW's series D MOVIMOT® decentralized drives can also be combined with its new EDRx explosion-proof motors. These drives have four-pole EDR motors that are suitable for operation with an integrated frequency inverter, with a motor power range of 0.25-3 kW. VDMA An X-series drive unit from SEW-Eurodrive. VDMA 47

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