Chapter 7 EMC (Electromagnetic Compatibility)
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Chapter 7 EMC (Electromagnetic
Compatibility)
7.1 Definition
Electromagnetic compatibility is the
ability of the electric equipment to run in the
electromagnetic interference environment
and implement its function stably without
interferences on the electromagnetic
environment.
7.2 EMC Standard Description
In accordance with the requirements of
the national standard GB/T12668.3, the
inverter needs to comply with electromagnetic
interference and anti- electromagnetic
interference requirements.
The existing products of our company
apply to the latest international
standard—IEC/EN61800-32004 (Adjustable
speed electrical power drive systems
part
3:EMC requirements and specific test
methods), which is equivalent to the national
standard GB/T12668.3.
IEC/EN61800-3 assesses the inverter in
terms of electromagnetic interference and
anti-electronic interference. Electromagnetic
interference mainly tests the radiation
interference, conduction interference and
harmonics interference on the inverter
(required for the inverter for civil use)
Anti-electromagnetic interference mainly tests
the conduction interference rejection,
radiation interference rejection, surge
interference rejection, fast and mutable pulse
group interference rejection, ESD interference
rejection and power low frequency end
interference rejection (specific test items
including: 1. Interference rejection tests of
input voltage sag, interrupt and change; 2.
Phase conversion notch interference rejection
test; 3. Harmonic input interference rejection
test; 4. Input frequency change test; 5. Input
voltage unbalance test; 6. input voltage
fluctuation test).
The tests shall be conducted strictly in
accordance with the above requirements of
IEC/EN61800-3, and the products of our
company are installed and used according to
Section 7.3 and have good electromagnetic
compatibility in general industry environment.
7.3 EMC Introduction
7.3.1 Harmonic Effect
Higher harmonics of power supply may
damage the inverter. Thus, at some places
where mains quality is rather poor, it is
recommended to install AC input reactor.
7.3.2 Electromagnetic Interference and
Installation Precautions
There are two kinds of electromagnetic
interferences, one is interference of
electromagnetic noise in the surrounding
environment on the inverter, and the other is
interference of inverter on the surrounding
equipment.
Installation precautions:
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