3 Installation
3.3 EMC installat ion
58 DC1 Frequency Inverter 10/12 MN04020003Z-EN www.eaton.com
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 ( Figure 11, page 37).
He must also utilize means to increase the interference immunity of the
devices of the system.
In a magnet system (PDS) with frequency inverters, you should take mea-
sures for electromagnetic compatibility (EMC) while doing your engineering,
since changes or improvements to the installation site, which are required in
the installation or while mounting, are normally associated with additional
higher costs as well.
The technology and system of a frequency inverter cause the flow of high
frequency leakage current during operation. All grounding measures must
therefore be implemented with low impedance connections over a large sur-
face 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 frequency inverter 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
For the EMC-compatible installation, connect all metallic parts of the device
and the control panel together over broad surfaces and so that high-frequen-
cies will be conducted. Mounting plates and control panel doors should make
good contact and be connected with short HF-drain wires. Avoid using
painted surfaces (Anodized, chromized). An overview of all EMC measures is
provided in Figure35 on Page 62.
￫
Ground
all conductive components and housings
in
a magnet
system using as short
a
line as possible with the greatest possi-
ble cross-section (Cu-drain wire).
￫
Install the frequency inverter as directly as possible (without
spacers) on a metal plate (mounting plate).
￫
Route mains and motor cables in the switch cabinet as close to
the ground potential as possible. This is because free moving
cables act as antennas.
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