
3 Installation
3.4 Correct EMC installation
DB1 variable frequency drive
11/20 MN040031EN
Eaton.com
58
3.4 Correct 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. They must also take measures to minimize or
remove emitted interference in the environment concerned. They must also
utilize means to increase the interference immunity (immission) of the
devices or systems.
The technology and system of a variable frequency drive causes high fre-
quency leakage currents during operation. Because of this, all grounding
elements must be low-impedance elements connected across a large
surface area.
In the case of any leakage currents greater than 3.5 mA, IEC/EN 61800-5-1
requires that
•
the cable cross-section of the protective conductor must be
≧
10 mm
2
,
•
the protective conductor must be open-circuit monitored, or
•
a second ground conductor must be fitted.
For an EMC-compliant installation, we recommend the following measures:
•
installation of the variable frequency drive in a metallic conductive
housing, with a good connection to ground,
•
shielded motor cables (short cables).
→
In a drive system (PDS) with variable frequency drives, you
should consider electromagnetic compatibility (EMC) during pro-
ject planning, since changes or improvements to the installation
site, which are required during the installation or mounting,
normally imply additional and higher costs.
→
Ground all conductive components and housings in a drive
system using as short a line as possible with the greatest
possible cross-section (Cu braid).
WARNING
In a home environment this product can cause high-frequency
interference, which may require remedial action.