text: <s>[INST] VFD / Motor Practical Range of Speed Control We are designing a rotary raking mechanisn driven by a gearbox that will operate at different speeds (from revolutions per minute to minutes per revolution). This equipment will be installed in a continuos (24/7) batch process operation. One option calls for a gearbox driven by a single 30HP inverter duty motor. Production requirements will demand VFD outputs ranging from a low of 1 HZ to a maximum of 108 HZ. Is this a sound and / or reliable design? [/INST] It could be done, you would really need to make sure that whatever motor you install can handle the extremes of such slow speed and then to be able to be adjusted to the higher speed too. I would also advise the use of an encoder to ensure that you accurately achieve the slow speed setting. Take care. \\n </s>