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When selecting a variable speed drive (VSD), it’s important to take the time to dimension it correctly.There might be different external and internal conditions that need to be considered when selecting the drive to run a machine or process. When aiming for long term reliability, these conditions might affect the rating of the drive. A drive which is correctly dimensioned will work properly throughout its lifetime.There are a number of factors that may require a drive to be derated (i.e. operate …