A client recently installed a screw conveyor with a Toshiba VFD, both 1HP. The system ran fine at full load, but when turned down to 40%, the controller indicated overload. We have a number of opinions around the plant, including the motor must be too small and that the VFD should be oversized, or that the OL was set wrong. Does anyone have any real world practical advice for setting this straight? We went to a DC motor, and all is well.
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