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So here are 3 things that will help you know when you can use a VFD.   1- The need to reduce energy consumption and energy costs. I'm not going to get deep into this one now because that is going to be the subject of next weeks episode. But know for now that that is a major reason to use a VFD.   2 - Greater production through efficiency and better process control. hey your motors are most efficient, you'll have less mistakes and production levels will increase. This typically generates more revenue, or cuts costs. You might not completely get this, but think about a conveyor belt. If it's jerky on starts and stops it could really mess things up.   3- Lastly, VFD's will extend equipment life and cut down on maintenance. No one likes to have to replace equipment on a regular basis or have to spend time or money having equipment down for repair. Using VFD's helps equipment last longer and reduces downtime because the VFD will keep the motor running at it's optimal speed. One of the biggest benefits of having VFDs optimally control the motor’s frequency and voltage is that the VFD will offer better protection from issues like electro thermal overloads, it gives phase protection, prevents under voltage and overvoltage, etc..