Siemens SINAMICS S120 Function Manual page 366

Basic functions
8.19 Energy-saving display
system characteristic is shifted by the speed controller to achieve the required flow rate. As a
consequence, the complete system operates close to the optimum efficiency - and especially
in the partial load range, uses significantly less energy than when using a throttle or valve to
control the flow rate.
Figure 8-7
364
Curve diagram: Energy-saving potential
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions