Chapter 4—Safety and Switching
18 DG1 Series VFD MN040002EN—March 2014 www.eaton.com
EMC Measures
Electrical components in a system (machine) have an
interaction effect on each other. Each device not only emits
interference but is also affected by it. The interference can
be produced by galvanic, capacitive, and/or inductive
sources, or by electromagnetic radiation. In practice, the limit
between line-conducted interference and radiated emitted
interference is around 30 MHz. Above 30 MHz, cables and
conductors act like antennas that radiate electromagnetic
waves.
Electromagnetic compatibility (EMC) for frequency controlled
drives (variable frequency drives) is implemented in
accordance with product standard IEC/EN 61800-3. This
includes the complete power drive system (PDS), from the
input supply to the motor, including all components, as well
as cables. This type of drive system can consist of several
individual drives.
The generic standards of the individual components in a PDS
compliant with IEC/EN 61800-3 do not apply. These
component manufacturers, however, must offer solutions
that ensure standards-compliant use.
In Europe, maintaining the EMC guidelines is mandatory.
A declaration of conformity (CE) always refers to a “typical”
power drive system (PDS). The responsibility to comply with
the legally stipulated limit values and thus the provision of
electromagnetic compatibility is ultimately the responsibility
of the end user or system operator. This operator must also
take measures to minimize or remove emission in the
environment concerned (see Figure 10). He must also use
means to increase the interference immunity of the devices
of the system.
With their high interference immunity up to category C2,
DG1 frequency inverters are ideal for use in commercial
networks (1st environment).
Table 14. Maximum Motor Cable Length by Frame Size
without dV/dT Protected C2 Ratings
Figure 10. EMC Measures
Frame Size Maximum Cable Length (m)
FR1 100
FR2 150
FR3 150
FR4 200
FR5 200
Low Voltage Supply Grid
1 Environment
st
Category C1 Category C1/C2
Low Voltage Supply Grid
2 Environment
nd
Category C3/C4
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