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  • Replacing a Mechanical Adjustable Speed Drive with a Variable Speed Drive
    Retrofitting an application using a mechanical adjustable speed drive such as a Reeves Motodrive® to an AC or DC variable speed drive can be done successfully if all the details are understood beforehand. First, let's take a look at what a Motodrive really looks like conceptually. A constant speed
  • A New Solution for Harmonics Generated by Variable Speed Drives (.pdf)
    The need for harmonic mitigating devices is growing because of the rapid increase in variable speed drive (VSD) usage in industrial and commercial applications and the corresponding growth in harmonic-related problems. A new state-of-the-art passive universal harmonic filter (UHF) is designed
  • AC motor drive applied to Fans in the Sugar Industry
    Traditionally, the most common way of changing the operating point is to use a damper which alters the system characteristic (operating point moves from position 1 to 2, see Fig. 11) and increase the system losses. However, no matter increasing or decreasing the fan speed, with a variable speed
  • Trim and Draw with Variable Speed Drives
    Typically, most variable speed applications simply require that the speed of the motor driving the load be controlled to some degree against a known reference. Examples are abundant when applied to pumps, conveyors, dynamometers, mixers, and many more. In some applications however, controlling
  • A Change in Speed Control Strategy Ramps up Production for Steel Company
    adjustments. The TSA team decided to upgrade the speed controls by using a variable speed drive (VSD), but they weren't sure how to size the new motor and drive. They also wanted to make sure the upgrade didn't introduce undue complexity to machine operation.
  • AC and DC Variable Speed Drives: Application Solutions
    will provide some form of motor speed regulation and variable speed operation. Within these categories, we offer a broad spectrum of horsepower ranges, drive interconnectivity capabilities, and flexibilities.
  • Selecting Explosion-Proof Motors and Variable Frequency Drive Controllers for Hazardous Environmental Applications
    Applying variable frequency power to explosion-proof motors in hazardous locations requires special considerations regarding UL 674, motor ratings and variable frequency drive characteristics to name a few. The attached paper (D-7154), originally published in Machine Design, highlights the issues
  • Variable Speed Drives and Centrifuges for Zone 1 Hazardous Areas (.pdf)
    Using a variable frequency drive (VFD) provides a standard solution to get the top performance of machines in many applications in the process industry. Today, there is no solution to install frequency converters inside the hazardous area. This limits the functionality and the ability for a compact

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