External Auxiliary Power Supply - Siemens SINAMICS G120 Applications Manual
Using blocksize converters in marine applications
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8.5
External auxiliary power supply
It is possible to connect an external 24-V-DC auxiliary power supply. This allows the Control
Unit to be operated independent of the main circuit (DC link).
Control/auxiliary circuits in the converter must fulfill PELV specifications.
It is not permissible to supply the control/auxiliary circuits directly from a 24-V-DC onboard
power supply. A switched-mode power supply must be connected in between in order to
obtain an electrically decoupled, regulated and "disturbance-free" 24-V power supply.
This switched-mode power supply must comply with interference immunity requirements as
laid down in IEC 60533 and those laid down in IACS "Requirements concerning
ELECTRICAL INSTALLATIONS".
Using SINAMICS G120 / G120C / S120 Blocksize converters in marine applications
Application Manual, 11/2019, A5E48346362A
Marine-specific installation regulations
8.5 External auxiliary power supply
31
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