SINAMICS S120 Cabinet Modules
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
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7.3.2.9 Parallel configuration
SINAMICS S120 Cabinet Modules are designed in such a way that standard devices can be operated in a parallel
connection at any time. A maximum possible configuration of up to four identical Basic Line Connection Modules,
Active Line Connection Modules or Motor Modules can be operated in a parallel connection for the purpose of
increasing their output power. Option M88 is required in order to construct a continuous DC busbar through parallel-
connected Basic Line Connection Modules and Active Line Connection Modules because the standard version of
these modules is not equipped with DC busbars in the Line Connection Module.
Since the possibility of imbalances in current distribution cannot be completely precluded in parallel connections of
Cabinet Modules, the derating factors for current or output need to be taken into account when parallel connections
are configured:
Designation Derating factor for parallel connection
of 2 to 4 modules
Max. permissible number of parallel-connected
modules
Active Line Connection Modules 0.950 4
Basic Line Connection Modules 0.925 4
Motor Modules 0.950 4
Only identical Line Modules or identical Motor Modules may be connected in parallel. "Identical" in this context means
that the voltage and current ratings, the output power and the versions of the Control Interface Modules CIM incl. the
relevant firmware releases must be the same. Additional boundary conditions relevant to the decoupling of parallel-
connected modules must be taken into account in the configuring process (see section "Parallel connections of
converters" in chapter "Fundamental Principles and System Description").
Power units connected in parallel are controlled by a common Control Unit via DRIVE-CLiQ. It must be noted that the
DRIVE-CLiQ cables required to interconnect cabinets must be ordered separately (please see section “DRIVE-CLiQ
wiring”).
It is not permissible to operate a mixture of different Line Modules (Basic Line Connection Modules with Active Line
Connection Modules).
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