Siemens SINAMICS G130 Engineering Manual page 277

SINAMICS S120 Cabinet Modules
Engineering Information
The precharging circuit for the DC link capacitors is realized differently in the various frame sizes of Active Line
Modules. With Active Infeeds consisting of Active Line Modules in frame sizes FX or GX and Active Interface
Modules in frame sizes FI or GI the required Bypass contactor is located in the corresponding Active Interface
Module. The supply voltage is taken from the Line Connection Module after the main switch.
Realization of the precharging circuit with Active Line Modules + Active Interface Modules in frame sizes FX+FI and GX+GI
With Active Infeeds consisting of Active Line Modules in frame sizes HX or JX and Active Interface Modules in frame
sizes HI or JI the required Bypass contactor is not a part of the Active Interface Module. In this case it is located in
the Line Connection Module as a circuit breaker. The supply voltage for the precharging circuit is taken from a
separate fuse-protected switch in the Line Connection Module.
Realization of the precharging circuit with Active Line Modules + Active Interface Modules in frame sizes HX+HI and JX+JI
It is important to take into account that the precharging capacity of the precharging circuit responsible for the charging
of the DC link capacitors has a unit-specific limit. Please refer to the section "Checking the maximum DC link
capacitance" of the chapter "SINAMICS S120, General Information about Built-in and Cabinet Units".
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.
SINAMICS Engineering Manual - May 2008
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