Siemens SINAMICS G130 Engineering Manual page 108

Fundamental Principles and System Description
Engineering Information
The following diagrams show the efficiency at partial load for SINAMICS S150 converters for drives with quadratic
2
load characteristic M~n . Basis of the calculations is a typical value for the efficiency of the converter at full load of
96 %. The representation of the efficiency is done in three different ways, the first in dependency on the converter
output frequency, the second in dependency on the converter output current and the third in dependency of the
converter output power.
Fig. 2a) shows the converter efficiency for drives with quadratic load characteristic in dependency on the converter
output frequency f /f
Out Rated
Fig. 2a)
Efficiency of SINAMICS S150 converters for drives with quadratic load characteristic
in dependency on the converter output frequency (specified in %)
Fig 2b) shows the converter efficiency for drives with quadratic load characteristic in dependency on the converter
output current I /I , which is in proportion to the motor torque M/M
Out Rated
Fig. 2b)
Efficiency of SINAMICS S150 converters for drives with quadratic load characteristic
in dependency on the converter output current (specified in %)
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, which is in proportion to the motor speed n/n
Rated
.
Rated