Rock Products

NOV 2018

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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Page 56 of 107 ROCK products • November 2018 • 55 EQUIPMENT & TECHNOLOGY PUMPS & MOTORS With its Sirius 3RW5 range, Siemens launched a new generation of soft start- ers for simple to demanding motor requirements. This comprehensive range of devices for the soft starting of three-phase asynchronous motors from 7 hp to 1,600 hp enables efficient, seamless and easy motor protection implementation and future-proof machine concepts to be implemented easily and cost-effectively. The new Sirius 3RW5 soft starters are suitable for any motor, they can be easily integrated into a new or existing automation system, and they supply data right up to MindSphere, the cloud-based, open IoT operating system of Siemens. Standard program- ming functions such as automatic parameterization, motor load ramp changes and electrical stabilization in the case of fluctuating- line voltages, all provide support for smooth motor operations in a myriad of applications. The new harmonized Sirius 3RW5 soft starter generation offers the right features and accessories for all requirements and adapts for application-specific or user-specific modifications. The new soft starter can also be used with individual expansions such as operator panels with and with- out display (HMIs), or communication via Profinet/Profibus and Modbus. The new Sirius 3RW5 soft starters can be used in a host of applications thanks to specific functions – from pumping, ventilating and compressing, to moving and processing. In addition, they fea- ture special functions such as starting time monitoring, automatic parame- terization depending on motor startup, pump stop to avoid pressure peaks in piping systems, and condition moni- toring with warning and alarm limits. They are also designed to be electrically rugged to fluctuations in line voltages. Siemens, Van der Graaf (VDG) Drum Motor Consumes Less Energy Conveyor users and conveyor manufac- turers have accepted the drum motor as the most efficient way to drive belt conveyors. With no external motor and gearbox, the drum motor saves space, eliminates the need for scheduled main- tenance and enhances operator safety. However, the challenge has been the ease and ability to adjust belt speed as plant processing requirements change. This is achieved via a frequency inverter (VFD), which often is located in a control room some distance away from the conveyor drive electric motor. The long cable connecting the VFD to the electric motor can impede motor perfor- mance and substantially reduce its life and reliability. Voltage attenuation, due to the long cable length, contributes to inconsistent power being delivered to the motor. Resulting high-voltage electrical spikes amplification in the motor wind- ings can cause complete motor failure. The general approach to overcome these issues is to substantially increase the dielectric strength value of the magnet wire used in the electric motor wind- ings. Sinusoidal filters also are installed to condition the power going to the motor and filter high-voltage spikes caused by the pulse-simulated sine wave of the VFD. Recently, Van der Graaf (VDG) began developing an advanced drum motor design with the VFD integrated into the motor junction box. The follow-up design to the built-in VFD is the development of an electric motor with even higher effi- ciency and additional capabilities. On a standard electric motor, the rotor has to be magnetically induced by the stator. Using part of the magnetization produced by the stator windings to magnetically induce the rotor results in significant magnetic energy losses and reduces mechanical output. As a result, motor efficiency decreases. With the VDG Intelligent Drum Motor (IntelliDrive) design, the rotor is magnetically self-induced by the use of permanent magnets installed on the rotor body. Lab test results show electrical sav- ings of up to 72 percent vs. a conventional motor/gearbox conveyor drive. The IntelliDrive requires a sensorless vector control to operate, and due to this requirement, must be used with the integrated VFD. The integrated VFD is EtherNet/IP and MODBUS compat- ible and enables communication with other plant equipment. It also can pro- vide conveyor drive data feedback and control belt speed either remotely or directly at the drum motor. The com- bination of the rotor with permanent magnets and the integrated VFD, distin- guishes the IntelliDrive from a standard drum motor. The IntelliDrive simplifies the selection of belt speed without loss of torque or belt-pull, substantially increasing the efficiency and the life of the electric motor, further minimizing downtime and decreasing overall operating costs. The innovation is best for portable plants, according to VDG. Van der Graaf (VDG), Siemens Soft Starters for Demanding Requirements

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