3 Installation
3.3 EMC installation
DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com 51
3.3 EMC installation
The responsibility to comply with the legally stipulated limit values and thus
the provision of electromagnetic compatibility is the responsibility of the end
user or system operator. This operator must also take measures to minimize
or remove emission in the environment concerned. He must also utilize
means to increase the interference immunity of the devices of the system.
When implementing a magnet system (PDS) with variable frequency drives,
it is advisable to take into account any necessary electromagnetic compati-
bility (EMC) measures during the engineering stage, as making changes
during assembly and installation and retroactively fixing things at the installa-
tion location will be more expensive.
The technology and system of a variable frequency drive cause the flow of
high frequency leakage current during operation. All grounding measures
must therefore be implemented with low impedance connections over a
large surface area.
With leakage currents greater than 3.5 mA, in accordance with VDE 0160
or EN 60335, either
• the cross-sectional area of the protective conductor must be 10 mm
2
,
• the protective conductor must be open-circuit monitored, or
• the second protective conductor must be fitted.
For an EMC-compliant installation, we recommend the following measures:
• installation of the variable frequency drive in a metallically conductive
housing
with a good connection to ground,
• screened motor cables (short cables).
3.3.1 EMC measures in the control panel
In order to have an installation that meets EMC requirements, make sure to
connect all the metallic parts in the devices and in the control panel to each
other across a large area and in a way that will make it possible to conduct
high frequencies. Mounting plates and control panel doors should make good
contact and be connected with short HF-drain wires. Avoid using painted
surfaces (anodized, yellow chromated). An overview of all EMC measures is
provided in Figure 31 on Page 53.
￫
Ground
all conductive components and housings
in
a magnet
system using as short
a
line as possible with the greatest
possible cross-section (Cu-drain wire).
￫
Install the variable frequency drive as directly as possible
(without spacers) on a metal plate (mounting plate).
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