Fundamental Principles and System Description
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
99/528
Line filters and IT systems
The standard line filters for category C3 and the optional line filters for category C2 are suitable for use only in
grounded supply systems (TN and TT systems with grounded neutral). Where SINAMICS equipment is to be
operated on an ungrounded (IT) supply system, the following must be noted:
· In the case of standard line filters, the connection between the filter and ground must be interrupted when
the equipment is installed or commissioned. This can be done simply by removing a metal clip as described
in the operating instructions.
· Optional line filters for category C2 must not be used at all.
If these rules are not followed, the line filters will be overloaded and irreparably damaged in the event of a ground
fault at the motor side. After the ground connection of the standard RFI suppression filter has been removed, the
units generally conform only to category C4 as defined by EMC product standard EN 61800-3 (see previous page for
relevant explanations).
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