Siemens SINAMICS GL150, Operating Instructions Manual

Page: 61 / 168

Preparations for use
4
When carrying out any work, carefully observe the information provided in Chapter "Safety
instructions (Page 15)".
4.1 Notes for system integrators
4.1.1 Requirements for transformers
Configure suitable converter transformers, i.e. not line transformers, for supplying the LCI
power units and the converters of the static excitation equipment. The transformers are
electrically dimensioned with regard to the following factors:
● Rated power
● Required overload capability
● Robustness for voltage supply deviations
● Requirements for the fuseless design of the converter with regard to limiting the short-circuit
current in the event of a fault
Configure the transformers so that they cover the reactive power dictated by the mode of
operation the application requires.
Danger due to an incorrectly configured transformer
A short-circuit and simultaneous failure of the closed-loop control system are dangerous if the
transformer configuration is incorrect. This can result in death, serious injury or material
damage.
● When selecting and dimensioning the transformer, observe the notes regarding the short-
circuit behavior for fuseless technology in Chapter Fuseless technology (Page 39).
As well as adjusting the input voltage of the converter to the line voltage, the transformer is also
used for electrically isolating the line. The transformer must also supply the required
commutation inductance for the line-side converter bridges and for limiting the line harmonics.
The 12-pulse circuit requires a transformer in the form of a two-tier transformer or two individual
transformers with two secondary windings offset through 30° electric. The system-oriented
open-loop control of the converter may take responsibility for monitoring the line-side
transformer for the power unit (option A72 or A73).
SINAMICS GL150 6SL38555UN113KA0Z
Operating Instructions Rev.201910281450 EXAMPLE
61