Electrical Installation; Permissible Line Supplies - Siemens SINAMICS G120D Original Instructions Manual

Installation

4.2 Electrical Installation

4.2 Electrical Installation
NOTICE
Material damage from inappropriate supply system V
Operating the converter on an inappropriate supply system can cause damage to the
converter and other loads.
• Only operate the converter on supply systems with V
4.2.1

Permissible line supplies

Operation on an IT line system is not permitted.
In an IT line system, all of the conductors are insulated with respect to the PE protective
conductor – or connected to the PE protective conductor through an impedance.
Operation on IT line systems is not permitted.
Operation on TN and TT line systems
TN line system
The TN line system in accordance with IEC 60364-1 (2005) transmits the PE conductor to
the installation via a conductor.
Generally, in a TN line system the neutral point is grounded. There are versions of a TN line
supply with a grounded line the conductor, e.g. with grounded L1.
A TN line system can transfer the neutral conductor N and the PE protective conductor either
separately or combined.
TT system
In a TT line system, the transformer grounding and the installation grounding are
independent of one another.
There are TT line supplies where the neutral conductor N is either transferred – or not.
Operation of the inverter on the TN and TT line system
The inverter is designed for TN and TT line systems with a grounded neutral point
Above an installation altitude of 2000 m, the permissible line supplies are restricted. See
also: Current and voltage derating dependent on the installation altitude (Page 330).
Prohibited operation
● Operation on TN line systems with grounded external conductors is prohibited.
● Operation on TT line systems without grounded neutral points is prohibited.
32
> 1%
t
≤ 1%.
t
Converter with control units CU250D-2
Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA