Siemens SINAMICS G115D

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The lower the 󹪞ow rate, the poorer the e󹪟ciency of the 󹪞uid 󹪞ow machine (pump). The
󹪞uid 󹪞ow machine (pump) has the poorest e󹪟ciency when the throttle or valve is completely
closed. Further, undesirable e󹪜ects can occur, for example the formation of vapor bubbles in
liquids (cavitation) or the temperature of the medium being pumped can increase.
The converter controls the 󹪞ow rate by appropriately varying the speed of the 󹪞uid 󹪞ow
machine. By controlling the 󹪞ow rate, the 󹪞uid 󹪞ow machine operates at the optimum
e󹪟ciency for each 󹪞ow rate. This situation means that in the partial load range less electric
power is required than when controlling the 󹪞ow rate using valves and throttles.
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Function description
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5HTXLUHG
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The converter calculates the en‐
ergy saving from the 󹪞ow charac‐
teristic associated with a mechan‐
ical 󹪞ow control and the meas‐
ured electric power that is drawn.
The calculation is suitable for cen‐
trifugal pumps, fans, radial and
axial compressors, for instance.
Advanced commissioning
7.29Calculating the energy saving for 󹪞uid 󹪞ow machines
SINAMICS G115D Wall Mounted distributed drive
338 Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA