Siemens SINAMICS S120 Manual de aplicaciones - Página 33

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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