Connecting
4.1 Power distribution systems
Power Module PM230 IP55
38 Hardware Installation Manual, 2010-07-02, A5E02923635A AB
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 TT Power System IT Power System
/
/
/
1
3(
/ / /
Exposed
Conductive Parts
/
/
/
3(
1
/ / /
1
3(
Exposed
Conductive Parts
/
/
/
1
3(
/ / /
Exposed
Conductive Parts
3(
/
/
/
1
/ / /
Exposed
Conductive
Parts
3(
/
/
/
1
/ / /
Exposed
Conductive
Parts
A TN-S power system
has separate neutral
and protective ground
conductors throughout
the system.
In a TN-C-S power
system, the neutral
and protective
functions are
combined in a single
part of the system.
In a TN-C power
system, the neutral
and protective
functions are
combined in a single
conductor throughout
the system.
A TT power system
has one point directly
grounded, the
exposed conductive
parts of the installation
being connected to a
ground, which is
electrically
independent of the
ground of the power
system.
An IT power system
has no direct
connection to ground -
instead the exposed
parts of the electrical
installation are
grounded.
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.
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