Power Distribution Systems; Operation Only With Grounded (Tn) Supplies; Table 4- 1 Power Distribution Systems - Siemens SINAMICS G120P Hardware Installation Manual

Connecting

4.1 Power distribution systems

4.1 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 inverter. In the next figures three phase systems are outlined.
The three phase inverter must be connected to L1, L2 and L3. PE must always be
connected. The inverter operates with most supply systems.
Table 4- 1 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.
Note
To ensure compliance for Class 1 protection in accordance with the EN 61140 directive, the
input and output line voltage supplies must be earthed.
4.2

Operation only with grounded (TN) supplies

Operation only with grounded (TN) supplies
The SINAMICS PM230 Power Modules have integrated filters and therefore cannot be used
in conjunction with IT or TT supplies.
Operation of the Power Modules without a protective earth is not permitted under any
circumstances.
38
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.
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.
Hardware Installation Manual, 2010-07-02, A5E02923635A 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.
Power Module PM230 IP55
Exposed
Parts