Siemens SINAMICS S120 Manual page 69

Ideally, these voltages are generated by an Auxiliary Power Supply Module. Other ways to
supply power is to use option K76 "Auxiliary voltage generating unit in the Line Connection
Module" or to feed the auxiliary voltages to the auxiliary power supply system from an
external source.
The maximum load-carrying capacity of the auxiliary power supply system is 80 A according
to IEC (or 80 A according to UL). If the total power requirement of the cabinet line-up
exceeds the maximum load rating, the auxiliary power supply system must be divided into
segments and several infeed points selected.
The following diagram shows the mechanical design of the auxiliary power supply system.
The standard assignment with the three auxiliary voltages is shown in the tables below.
Figure 4-3
The auxiliary power supply system for an individual cabinet unit consists of an auxiliary
power module and the connecting cables.
The auxiliary power module comprises two terminal blocks (-X100, -X101) and one fuse (-
F24) for the 24 V DC supply. The auxiliary power module is used to tap the necessary
auxiliary voltages at terminal block -X100 and to forward auxiliary voltages to terminal block
-X101 in the adjacent cabinet unit.
The connections are made using two special cables. One 4-phase cable for the power
supply (1, 2) and for 230 V AC (3, 4), and an additional screened 2-phase cable for 24 V DC
(1, 2).
The auxiliary power supply system is ready-to-operate as supplied. The cabling required
from the terminal block into the relevant Cabinet Module are factory-installed. Only the
connection to the adjacent Cabinet Module must be established on site by fastening the
cables to the next terminal block. These connections are already established within transport
units. Only the transport units need to be interconnected.
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A
Auxiliary power supply system for voltage distribution
Electrical installation
4.4 Connections
69