Dc Link Fuses; Parallel Connections Of Basic Line Connection Modules - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information
7.3.5.2

DC link fuses

Basic Line Connection Modules are not equipped with DC fuses as standard.
If DC fuses are required, they can be ordered with option N52. The DC fuses are mounted on the connecting rail to
the DC busbar in the cabinet rather than in the power unit itself.
7.3.5.3

Parallel connections of Basic Line Connection Modules

Basic Line Connection Modules can also be operated in a parallel connection. Up to four identical Basic Line
Connection Modules can be connected in parallel.
Note:
By contrast with air-cooled S120 Cabinet Modules for which special Line Connection Modules and Basic Line
Modules for parallel connections are available, only the standard Basic Line Connection Modules can be connected
in parallel for liquid-cooled S120 Cabinet Modules.
The following points must be taken into account:
• The fundamental rules regarding the parallel connection of S120 Basic Line Modules apply. Please refer to section
"Parallel connections of converters" of chapter "Fundamental Principles and System Description".
• It is essential to install fuse switch disconnectors (≤ 800 A) or circuit breakers (> 800 A) in the parallel-connected
Line Connection Modules for the purpose of line-side fuse protection. A monitoring system must be implemented
via terminals -X50 of the relevant Line Connection Modules (checkback signal of fuse switch disconnector or
checkback signal of circuit breaker).
• The use of DC link fuses (option N52) to protect the DC busbar is recommended.
• In order to establish a continuous DC busbar through all Basic Line Connection Modules in the parallel connection,
option M88 must be ordered for each module. This is necessary because the standard Basic Line Connection
Modules are not equipped with DC busbars in the Line Connection Module.
The DRIVE-CLiQ cables from each of the Basic Line Connection Modules in the parallel connection to the common
Control Unit must also be taken into account.
SINAMICS Engineering Manual – November 2015
468/528
Ó Siemens AG