Of utmost importance is the main circuit wiring required to power the VFD and actually turn a motor. The input terminals accept line voltage and the output terminals connect the motor(s).

Figure 3 shows a sample wiring diagram of a VFD controlling one 20 hp electrical induction AC motor; the hp rating of the VFD must not exceed the hp rating of the motor. In the example shown in Figure ...

Industrial facilities commonly use variable-frequency drives (VFDs) to control the speed at which alternating current motors operate. Let’s examine a couple of typical scenarios commonly encountered ...