Power Distribution Systems - Siemens PM250 Hardware Installation Manual

Connecting

4.2 Power distribution systems

4.2 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 will operate 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.
Filtered drives can only be used on power systems with grounded starpoint.
Note
For fulfilling the protection class I according to EN 61140 the input and output supply
voltages have to be earthed.
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.
Hardware Installation Manual, 09/2012, A5E01003502B AD
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.
PM250 Power Module
Exposed
Parts