Siemens SINAMICS G130 Engineering Manual page 423

SINAMICS S120 Cabinet Modules
Engineering Information
The power supply for the fan in the Active Interface Module presents an anomaly withing the S120 Cabinet Module
range. This fan is delivered, in opposite to all other Cabinet Modules, without a matching transformer and requires
connection to a voltage supply of 230 V AC. This voltage supply is provided by the Line Connection Module. In the
Line Connection Module a fuse-protected connection is available for this purpose, either for connection to the
auxiliary voltage supply system or to an external voltage soure.
The precharging circuit for the DC link capacitors is implemented in different ways depending on the frame size of the
Active Line Module. In the case of an Active Infeed with an Active Line Module of frame size FX or GX, the
precharging components and the required bypass contactor are located in the associated Active Interface Module.
The supply voltage is taken from the Line Connection Module after the main switch.
Precharging with air-cooled Active Line Modules + Active Interface Modules in frame sizes FX+FI and GX+GI
In the case of an Active Infeed with an Active Line Module in frame size HX or JX, the precharging components are
located in the matching Active Interface Module with the exception of the bypass contactor. The bypass contactor,
either a contactor or circuit breaker, is installed in the relevant Line Connection Module. The supply voltage for the
precharging circuit is taken from a separate fuse-switch disconnector in the Line Connection Module.
Precharging with air-cooled Active Line Modules + Active Interface Modules in frame sizes HX+HI and JX+JI
It is important to note that the charging capacity of the circuit for precharging the DC link capacitors is limited
depending on the unit type. Please refer to section "Checking the maximum DC link capacitance" in chapter "General
Information about Built-in and Cabinet Units SINAMICS S120".
The connections of the precharging circuit, as well as control cables from the Active Line Module to the circuit
breaker are already included in the S120 Cabinet Modules and harmonized via option L42 with the corresponding
LCM.
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Ó Siemens AG