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More information on the Mentor MP range of DC drives - .PDF file.

Evraz Highveld Steel and Vanadium in South Africa has replaced its analogue DC drives with digital DC drives from Control Techniques, enabling the energising of electromagnets to increase throughput on a steel-bar production line. 

The electromagnets are used on overhead cranes at numerous points in the production process for the transport of steel bars.

Control Techniques Southern Africa provided a fully engineered solution comprising a 210A/480V and four-quadrant Mentor MP DC drives for each electromagnet, in conjunction with a freewheel diode that dissipates the back EMF into the magnet when the magnet is de-energised, providing a discharge path for the current.

Evraz Highveld specified the need to regulate the current very accurately to prevent overcurrent from damaging the magnets, and the drives are configured in torque control. 

Key specifications

  • Arrangement implemented ensures that the intensity of the magnetic field is maintained, irrespective of ambient temperature
  • It integrates the control platform from Unidrive SP
  • Three slots for option modules are provided
  • Built-in field controller and user-friendly software using real units are also included
  • Mentor MP spans 25A to 1,850A as a single module — 7,400A when paralleled
  • It is available in 12- and 18-pulse configurations for low harmonics
  • There is also an optional keypad, available as a high-brightness LED or multi-language LCD version with plain text
  • Smartcard provides parameter, programmable logic control, motion program storage and drive ‘cloning’
  • Damage from burning of the windings through excessive current has been eliminated

Control Techniques

Control Techniques, an Emerson Industrial Automation company, is a world leader in the design, production and marketing of electronic variable speed drives for the control of electric motors. Our strategy is to concentrate on delivering drives and servo products that enhance the productivity of our customers’ machines and processes.

We operate through a global network of drive and application centres that both distribute product and add value by building our drive products into custom designed systems and by offering the highest levels of customer service.

Our Control Techniques drive centres also provide us with invaluable feedback and market intelligence so that we can further improve our products and service. This customer focused strategy will enable us to continue to grow profitably.

Our competitive edge is based on our unique focus on drives, our strength in research and development, our investment low-cost manufacturing and an effective worldwide marketing strategy.

Emerson Industrial Automation, a business of Emerson, is a global technology provider that enables productivity, efficiency and quality gains for customers across a spectrum of industries. Our products include alternators, electric motors and drives, electrical distribution devices and mechanical power transmission, fluid automation and ultrasonic joining solutions. Visit our website for more details.

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