Connecting Inverters In Compliance With Emc; Emc-Compliant Connection Of The Converter; Avoid Electromagnetic Interference (Emi) - Siemens SINAMICS G120 Operating Instructions Manual

4.6

Connecting inverters in compliance with EMC

4.6.1

EMC-compliant connection of the converter

EMC-compliant installation of the inverter and motor are required in order to ensure
disturbance-free operation of the drive.
Install and operate inverters with IP20 degree of protection in a closed control cabinet.
Inverters with degree of protection IP55 are suitable for installation outside a control cabinet.
An overview of control cabinet installation and cabling can be found in the following section.
For further details, refer to the installation instructions of the Power Module.
The EMC-compliant connection of the inverter itself is described in the following sections.
4.6.2

Avoid electromagnetic interference (EMI)

The inverters are designed to operate in an industrial environment where a high level of EMI
can be expected. Safe, reliable and disturbance-free operation is only guaranteed if the
devices are professionally installed.
Control cabinet design
● Connect the metal parts and components of the control cabinet to the control cabinet
● Connect the PE bar and the EMC shield bar to the control cabinet frame through a good
● Connect the metal enclosures of the devices in the cabinet, e.g. converter or line filter, to
● Choose one of the following methods to establish a conducting contact for screw
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
frame through a good electrical connection:
– Side panels
– Rear panels
– Roof
– Base plates
Using the highest possible surface area or a high number of individual screw
connections.
electrical connection established through a large surface area.
the control cabinet frame through a good electrical connection through the largest
possible surface area.
We recommend to mount these devices on a bare metal mounting plate with good
conducting characteristics.
connections on painted or anodized surfaces:
– Use special contact (serrated) washers that cut through the
– Remove the insulating surface at the contact locations
4.6 Connecting inverters in compliance with EMC
Installing
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