The solid lines represent the performance of the variable-speed drive (VSD), while the dashed lines denote the performance of the constant-speed drive (CSD). Figure 2 is a graph that presents the ...

When a variable speed drive is used for controlling airflow, the ID fan is designed to operate at the peak efficiency at test block and MCR with SCR in service. A slightly lower efficiency is ...

Fig. 1. Graph of line current and power factor of a 55kW AC induction motor as funtion of its load. Before examining its effects on motors, a discussion of PF is in order. The term power factor is ...