Challenge Before the process update, VFD efficiency was anywhere from 20% to 70%. Part of the whole process was on an Uninterruptible Power System (UPS) due to the critical nature of the line. Necessary as it was, however, the UPS also lacked energy efficiency running at 80% to 93% efficiency. Solution To update the variable speed control used on the spinning line, ENKA went with Yaskawa’s F7 and G7 AC VFD. The drives had nominal 98% efficie

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