Basic Line Modules; Design - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information

7.2.5 Basic Line Modules

7.2.5.1

Design

Basic Line Modules are available for air-cooled SINAMICS S120 Cabinet Modules in the output power range of 200
to 900 kW at 400 V and 250 to 1500 kW at 690 V.
Basic Line Modules can be used in combination with Line Connection Modules. The two module types must be
directly connected. A BLM cannot be installed at a remote location from the LCM. Possible combinations can be
found in the section "Line Connection Modules".
Air-cooled Basic Line Modules in frame sizes FB and GB / GD, and Basic Line Module for parallel connections
Every Basic Line Module requires a connection to a Control Unit. Differences between frame sizes FB and GB / GD
in terms of mechanical design and optional equipment only consist in use of different Chassis frame sizes.
A controlled thyristor bridge is used on frame sizes FB and GB to precharge the connected DC link by the Basic Line
Module. The thyristors operate normally with a firing angle of 0° and operate, therefore, comparable to diodes.
Basic Line Modules of frame size GD with a power rating of 900 kW (400 V) resp. 1500 kW (690 V) feature a diode
bridge. On these units, the DC link is precharged via a separate, line-side precharging circuit. This is fitted in the Line
Connection Module and selected via option L43 of the LCM.
It is important to note that the DC link charging capacity 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".
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