Power Distribution Systems; Operation Only With Grounded (Tn) Supplies - 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 TN-C-S Power System TN-C Power System
A TN-S power system In a TN-C-S power
has separate neutral system, the neutral
and protective ground and protective func-
conductors throughout tions are combined in
the system. a single part of 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
TT Power System
In a TN-C power sys- A TT power system
tem, the neutral and has one point directly
protective functions grounded, the ex-
are combined in a posed conductive
single conductor parts of the installation
throughout the system. being connected to a
ground, which is elec-
trically independent of
the ground of the
power system.
Hardware Installation Manual, 11/2014, A5E35319202B AA
IT Power System
An IT power system
has no direct connec-
tion to ground - in-
stead the exposed
parts of the electrical
installation are
grounded.
PM230 Power Module IP55