Connecting The Converter; Power Distribution Systems - Siemens SINAMICS G120 Operating Instructions Manual

Installing

4.6 Connecting the converter

4.6 Connecting the converter
4.6.1

Power distribution systems

Overview of Power Distribution Systems
The power distribution systems described below, as defined in EN 60950 , have been
considered in the design of the converter. In the next figures three phase systems are
outlined. The three phase converter must be connected to L1, L2 and L3. PE must always be
connected. The converter operates with most supply systems.
Table 4- 2 Power distribution systems
TN-S Power System
Exposed
Conductive Parts
A TN-S power system
has separate neutral
and protective ground
conductors throughout
the system.
IT supplies are fully isolated from the protective earth system, usually by an isolating
transformer. It should be noted, however, that a protective earth is still provided.
Converters with built-in filters or external filters must not be used with IT supplies.
32
TN-C-S Power System TN-C Power System
Exposed
Conductive Parts
In a TN-C-S power
system, the neutral
and protective
functions are
combined in a single
part of the system.
WARNING
TT Power System
Exposed
Conductive Parts
In a TN-C power A TT power system
system, the neutral has one point directly
and protective grounded, the
functions are exposed conductive
combined in a single parts of the installation
conductor throughout being connected to a
the system. ground, which is
electrically
independent of the
ground of the power
system.
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB
IT Power System
Exposed
Conductive
Conductive
Parts
An IT power system
has no direct
connection to ground -
instead the exposed
parts of the electrical
installation are
grounded.
SINAMICS G120C frequency converter
Exposed
Parts