EMC installation
EMC
EMC best practices
Frequency converter (and other electrical
devices) generate electronic or magnetic fields
that may interfere with their environment. The
electromagnetic compatibility (EMC) of these
effects depends on the power and the harmonic
characteristics of the devices.
The EMC product standard for frequency
converters defines 4 categories (C1, C2, C3, and
C4) with specified requirements for emission and
immunity. Below table states the definition of
the 4 categories and the equivalent classification
from EN 55011.
•
Use screened (shielded) cables for motor,
control wiring and communication.
•
Separate cables for input power, motor
wiring and control wiring. Failure to isolate
power, motor, control and communication
cables can result in unintended behavior or
reduced performance. Minimum 200 mm
(7.9 in) clearance between power, motor and
control cables is required.
•
Ensure VFD proper grounding.
•
Motor cables should be as short as possible
to reduce noise level and leakage currents.
•
Use the decoupling plate to fix and
terminate cables(Refer to EMC correct
installation of a frequency drive CDS803).
VLZ compressor with drive package achieve EMC Class A Group 1 emission and immunity requirements.
Category
Definition
Equivalent emission class in EN 55011
C1
Frequency converters installed in the first environment (home and
office) with a supply voltage less than 1000 V.
Class B
C2
Frequency converters installed in the first environment (home and
office) with a supply voltage less than 1000 V, which are not plug-in and
not movable, and must be installed and commissioned by a profession-
al.
Class A Group 1
C3
Frequency converters installed in the second environment (industrial)
with a supply voltage lower than 1000 V.
Class A Group 2
C4
Frequency converters installed in the second environment with a supply
voltage equal to or above 1000 V or rated current equal to or above 400
A or intended for use in complex systems.
No limit line. Make an EMC plan
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