Siemens SINAMICS G130 Engineering Manual page 235

If SINAMICS G130 Chassis units and S120 Chassis units are installed in standard converter cabinets with coated
sheet steel, the interference radiation will fulfill the requirements of category C3 as defined by EMC product standard
EN 61800-3 if the following measures are observed:
·
All metallic housing components and mounting plates in the converter cabinet must be connected, both to
one another and to the cabinet frame, via a large contact area with high electrical conductivity. Large
metallic connections or connections established by means of grounding strips with excellent high frequency
properties are ideal for this purpose.
·
In addition to its existing protective ground connection, the frame of the cabinet must be connected where
possible at several points to the foundation ground (meshed network) by a low-inductance connection
suitable for high-frequency currents. A description of suitable means of making this connection can be found
in section "Bearing currents caused by steep voltage edges on the motor" in chapter "Fundamental
Principles and System Description".
·
Cabinet covers (e.g. doors, side panels, back walls, roof plates, and floor plates) must also be connected to
the cabinet frame with high electrical conductivity, ideally by means of grounding strips with excellent high
frequency properties.
·
All screwed connections on painted or anodized metallic components must either be equipped with special
contact washers that penetrate the non-conductive surface, thereby establishing a metallically conductive
contact, or the non-conductive surface between the parts to be connected must be removed prior to
assembly to establish a plane metallic connection.
·
For EMC reasons, ventilation openings must be kept as small as possible. On the other hand, the laws of
fluid mechanics dictate that certain minimum cross-sections are required in order to ensure satisfactory
cabinet ventilation. An appropriate compromise must therefore be found. For this reason, ventilation grilles
with typical opening cross-sections of about 190 mm
Connection of doors, side walls, back walls, roof plates, and floor plates to the cabinet frame
The SINAMICS G150 and S150 converter cabinet units as well as the Cabinet Modules of the SINAMICS S120
modular cabinet units are built at the factory in such a way that they automatically comply with the interference
radiation limit values defined in category C3 of the EMC product standard EN 61800-3. Safe compliance with the
standard is conditional upon closed cabinet doors and the use of shielded motor cables of < 100 m in length. With the
optional line filters (option L00) installed, the units specified above comply with the interference radiation limit values
defined in category C2 of the EMC product standard EN 61800-3. In this case as well, safe compliance with the
standard is again conditional upon closed cabinet doors and the use of shielded motor cables of < 100 m in length.
EMC Installation Guideline
Engineering Information
2
per hole are used on SINAMICS cabinet units.
SINAMICS Engineering Manual – November 2015
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Ó Siemens AG