Auxiliary Voltage Supply System - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information
7.2.3.3

Auxiliary voltage supply system

To simplify the auxiliary voltage supply to S120 Cabinet Modules, the individual modules are equipped with a special,
standardized auxiliary voltage supply system for auxiliary voltage distribution.
This comprises an auxiliary voltage module and the required connecting cables. It is supplied in a fully assembled
state. The required connections from the auxiliary voltage module into the relevant Cabinet Module are wired at the
factory. The cable connections between the auxiliary voltage modules of individual Cabinet Modules are also
prewired in transport units supplied from the factory. The only remaining task to be performed on site is to make the
cable connection to the adjacent Cabinet Module or adjacent transport units. This can be done simply by connecting
the supplied cables to the next auxiliary voltage module.
The diagram below shows the mechanical design of the auxiliary voltage supply system.
Auxiliary voltage supply system on air-cooled SINAMICS S120 Cabinet Modules
Voltages provided by the auxiliary voltage supply system must be fed into the system from an external auxiliary
voltage supply source. In large-scale configurations with high auxiliary power requirements, an Auxiliary Power
Supply Module is ideal for this purpose. On smaller configurations, it is better to feed the the auxiliary voltage supply
system by the Line Connection Module. In this case, the Infeed must be ordered separately as an option (order code
K76 for LCM if all three voltages (line voltage 1AC, 230 V 1AC and 24 V DC) are needed, or order code K70 if only
the 1AC line voltage is required to supply the fans of the connected S120 Cabinet Modules).
The maximum load rating of the auxiliary voltage supply system is 80 A according to IEC (80 A according to UL). If
the total power requirement of the cabinet configuration exceeds the maximum load rating, the auxiliary voltage
supply system must be split into segments. In this case, each segment has to be fed separately.
The auxiliary voltage module consists of two terminal blocks (-X100, -X101) and a fuse for 24 V DC. Its purpose is to
tap the required auxiliary voltages at terminal block -X100 and to loop them through or transfer them to the next
auxiliary voltage module in the adjacent Cabinet Module via terminal block -X101.
Auxiliary voltage module of air-cooled S120 Cabinet Modules with terminal blocks -X100, -X101 and fuse for 24 V DC
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