Siemens SINAMICS G130 Engineering Manual page 188

Fundamental Principles and System Description
Engineering Information
The charts below show the partial-load efficiency of SINAMICS G130 and G150 converters for drives with quadratic
2
load characteristic M~n . The calculations are based on a typical efficiency at full load of 98 %. The efficiency is
represented in three different ways. In one chart, the efficiency is shown as a function of the output frequency, in the
second chart, as a function of the output current, and in the third chart, as a function of the active output power.
Figure 2a) shows the characteristic curve of the efficiency for drives with quadratic load characteristic as a function of
the output frequency ratio f
Figure 2a)
Efficiency of SINAMICS G130 and G150 converters in drives with quadratic load characteristic
as a function of the output frequency ratio in %
Figure 2b) shows the characteristic curve of the efficiency for drives with quadratic load characteristic as a function of
the output current ratio I
Out
Figure 2b)
Efficiency of SINAMICS G130 and G150 converters in drives with quadratic load characteristic
as a function of the output current ratio in %
SINAMICS Engineering Manual – November 2015
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/f which is proportional to the motor speed ratio n/n
Out Out-rated
/I which is proportional to the motor torque ratio M/M
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rated
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