Siemens SINAMICS G115D

Active e󹪟ciency optimization has the following advantages:
• Lower energy costs
• Lower motor temperature rise
• Lower motor noise levels
Active e󹪟ciency optimization has the following disadvantage:
• Longer acceleration times and more signi󹪝cant speed dips during torque surges.
The disadvantage is only relevant when the motor must satisfy high requirements relating
to the dynamic performance. Even when e󹪟ciency optimization is active, the converter
closed-loop motor control prevents the motor from stalling.
Precondition
E󹪟ciency optimization functions under the following preconditions:
• Operation with an asynchronous motor
• Vector control is set in the converter.
Function description
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The three variables that the converter can directly set, which de󹪝ne e󹪟ciency of an
asynchronous motor, are speed, torque and 󹪞ux.
However, in all applications, speed and torque are speci󹪝ed by the driven machine. As a
consequence, the remaining variable for the e󹪟ciency optimization is the 󹪞ux.
The converter has two di󹪜erent methods of optimizing the e󹪟ciency.
E󹪟ciency optimization, method 2
Generally, energy e󹪟ciency optimization method2 achieves a better e󹪟ciency than
method1.
We recommend that you set method2.
Advanced commissioning
7.28E󹪟ciency optimization
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 335