Siemens Sinamics S120 Function Manual page 273

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Solution to optimize the system

When using a speed controller, the process-specific flow rate of the continuous-flow machine

is controlled by varying the speed. The flow rate changes proportionally with the speed of the

continuous-flow machine. Any throttles or valves remain completely open. The entire

plant/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.

Drive functions

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

Basic functions

6.16 Energy-saving display

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