Specifications

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4.4 Installation
Installation
Installation
Installation Guidline
Guidline
Guidline
Guidline to
to
to
to EMC
EMC
EMC
EMC Compliance
Compliance
Compliance
Compliance
4.4.1
4.4.1
4.4.1
4.4.1 General
General
General
General knowledge
knowledge
knowledge
knowledge of
of
of
of EMC
EMC
EMC
EMC
EMC is the abbreviation of electromagnetic compatibility, which means the device or system has the
ability to work normally in the electromagnetic environment and will not generate any electromagnetic
interference to other equipments. EMC includes two aspects : electromagnetic interference and
electromagnetic immunity .According to the transmission mode, Electromagnetic interference can be
divided into two categories: conducted interference and radiated interference.Conducted interference is
the interference transmitted by conductor. Therefore, any conductors (such as wire, transmission line,
inductor, capacitor and so on) are the transmission channels of the interference.Radiated interference is
the interference transmitted in electromagnetic wave, and the energy is inverse proportional to the square
of distance.Three necessary conditions or essentials of electromagnetic interference are: interference
source, transmission channel and sensitive receiver. C ontrolling these factors is right the point of settling
the EMC issue. For customers, the solution of EMC problem is mainly originated from transmission
channel because of transimitting source and receiver are not changable.
4.4.2
4.4.2
4.4.2
4.4.2 EMC
EMC
EMC
EMC features
features
features
features of
of
of
of inverter
inverter
inverter
inverter
Like other electric or electronic devices, inverter is not only an electromagnetic interference source but
also an electromagnetic receiver. The operating principle of inverter determines that it can generate
certain electromagnetic interference noise. A t the same time inverter should be designed with certain
anti-jamming ability to ensure the smooth working in certain electromagnetic environment. F ollowing is its
EMC features:
4.4.2.1 Input current is non-sine wave. The input current includes large amount of high-harmonic waves
that can cause electromagnetic interference, decrease the grid power factor and increase the line loss.