Partial Load Efficiency Of S150 Converters - Siemens SINAMICS G130 Engineering Manual

Fundamental Principles and System Description
Engineering Information

1.14.2.7 Partial load efficiency of S150 converters

The charts below show the partial-load efficiency of SINAMICS S150 converters for constant-torque drives. The
calculations are based on a typical efficiency at full load of 96 %. The efficiency is represented in two different ways.
In one chart, the efficiency is shown as a function of the output frequency with the output current as a parameter, and
in the second chart, as a function of the output current with the output frequency as a parameter.
Figure 1a) shows the characteristic curve of the efficiency for constant-torque drives as a function of the output
frequency ratio f /f
Out Out-rated
curves is the output current ratio I
Figure 1a)
Efficiency of SINAMICS S150 converters in constant-torque drives
as a function of the output frequency ratio in %
Figure 1b) shows the characteristic curve of the efficiency for constant-torque drives as a function of the output
current ratio I /I which is proportional to the motor torque ratio M/M
Out Out-rated
curves is the output frequency ratio f
Figure 1b)
Efficiency of SINAMICS S150 converters in constant-torque drives
as a function of the output current ratio in %
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which is proportional to the motor speed ratio n/n
/I which is proportional to the motor torque ratio M/M
Out Out-rated
/f which is proportional to the motor speed ratio n/n
Out Out-rated
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