Erection Of Cabinets - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information
7.3.3.4

Erection of cabinets

Standard erection
The standard erection sequence for liquid-cooled Cabinet Modules is generally from left to right, starting with the
Infeeds (Basic Line Connection Modules or Active Line Connection Modules), followed by the Motor Modules and
ending with the Heat Exchanger Modules, as shown in the diagram below.
Cabinet line-up comprising a Basic Line Connection Module, three Motor Modules and a Heat Exchanger Module
Cabinet line-up comprising an Active Line Connection Module, three Motor Modules and a Heat Exchanger Module
As regards the Motor Modules sequence, the Motor Modules with high output ratings should be placed closest to the
Infeed and the others arranged in descending order of output rating. This arrangement is not absolutely essential, but
allows better dimensioning of the DC busbars in large cabinet line-ups because it is often possible to reduce busbar
cross-sections and thus cut costs. For further information, please refer to section "SINAMICS Inverters or Motor
Modules" in chapter "Fundamental Principles and System Description".
The Heat Exchanger Module must be installed on the right as the last module in the cabinet line-up. This
arrangement is necessary for design reasons as the Heat Exchanger Module cannot be delivered with a DC busbar.
Side panels (option M26 / side panel on the right or option M27 / side panel on the left) must be fitted at the beginning
and at the end of the complete cabinet line-up in order to comply with the degree of protection requirements.
If an Auxiliary Power Supply Module (available soon) to generate auxiliary voltages is required for a large cabinet
line-up, this should be placed at the beginning or end of the line-up whenever possible. When the Auxiliary Power
Supply Module is installed at the end of the line-up, it must be the last but one Cabinet Module with the Heat
Exchanger Module placed to the right of it (as described above).
Parallel connections
When Infeeds are connected in parallel in order to increase their power output, the configuration should be as
symmetrical as possible in order to ensure symmetrical current distribution and to allow simultaneous tripping of the
line-side protective devices (fuses or circuit breakers) in the event of a short circuit. In this case, the Basic Line
Connection Modules or Active Line Connection Modules are located in the center of the cabinet line-up.
With this arrangement, option M88 (DC busbar system for liquid-cooled line-side Cabinet Modules) is required. This
option is needed in order to establish a continuous DC busbar through the parallel-connected Infeeds because the
standard Basic Line Connection Modules and Active Line Connection Modules are not equipped with DC busbars in
the Line Connection Module. The current-carrying capacity of the conductor bars in the continuous DC busbar
depends on the selected option (M80 to M87).
If a parallel connection of several Basic Line Connection Modules designed to reduce harmonic effects on the supply
is to be supplied as a 12-pulse arrangement by a three-winding transformer, then an even number of Basic Line
Connection Modules must be selected (two or four BLCMs).
SINAMICS Engineering Manual – November 2015
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Ó Siemens AG