Siemens Sinamics PM250 - EMC-compliant installation

Connection
5.2 EMC-compliant installation
PM250 Power Module
38 Hardware Installation Manual, 01/2016, A5E36265179B-AA
5.2
EMC-compliant installation
5.2.1
Avoiding electromagnetic interference
Only the concurrent use of filtering, grounding and shielding ensure an installation in
accordance with the EMC requirements.
The next sections cover all of the most important rules for the installation of inverter and
drive systems.
5.2.2
Avoiding electromagnetic influence (EMI)
The inverters are designed for operation in industrial environments where high values of EMI
are expected. Safe, reliable and disturbance-free operation is only guaranteed if the devices
are installed by appropriately trained and qualified personnel.
Control cabinet design
● Establish all of the connections so that they are durable.
● Connect the metallic parts and components of the control cabinet to the frame of the
cabinet through a good electrical connection.
– Side panels
– Rear panels
– Cover plate
– Base plates
Use the largest possible contact area or many individual screw connections.
● Connect the PE bar and the EMC shield bar to the control cabinet frame through a good
electrical connection established through a large surface area.
● Connect all metal enclosures of the components installed in the cabinet with the control
cabinet frame through a large surface area to ensure a good electrical connection. To
achieve this, mount the components on a bare metal surface and mounting plate with
good conductivity, which you then connect to the control cabinet frame through the
largest possible surface area to establish a good connection, especially with the PE and
EMC shield bars.
● For screw connections onto painted or anodized surfaces, establish a good conductive
contact using one of the following methods:
– Use special (serrated) contact washers that cut through the painted or anodized
surface.
– Remove the insulating coating at the contact locations.