Chapter 4 Electrical Installation Shenzhen Hpmont Technology Co., Ltd
―28― HD20 Series Inverters User Manual
4.5 Meet EMC Requirement of Installation
4.5.1 Correct EMC Installation
According national standards GB/T12668.3, the inverter should meet the two requirements of
electromagnetic interference (EMI) and anti-electromagnetic interference. The international
standards IEC/61800-3 (VVVF drive system part 3: EMC specifications and test methods) are
identical to the national standards GB/T12668.3.
HD20 Series Inverters are designed and produced according to the requirements of IEC/61800-3.
Please install the inverter as per the description below so as to achieve good electromagnetic
compatibility (EMC).
Divide the installation space into different areas:
In a drive system, the inverter, control equipment and sensors are installed in the same cabinet,
the electromagnetic noise should be suppressed at the main connecting points with the EMI filter
and input reactor installed in cabinet to satisfy the EMC requirements.
The most effective but expensive measure to reduce the interference is to isolate the noise
source and the noise receiver, which should be considered in mechanical system design phase.
In driving system, the noise source can be inverter, braking unit and contactor. Noise receiver can
be automation equipment, encoder and sensor etc.
The mechanical/system is divided into different EMC areas according to its electrical
characteristics. The recommended installation positions are shown in Figure 4-15.
Figure 4-15 System wiring sketch
HD20 inverter
EMI filter
Mechanical system
EMI filter
AC reactor
Manufacture machines
Area E
AreaA: install transformers of control power supply,
control devices and sensor etc.
Power supply control cabinet
Area C
Area A
Area B
Area D
Area F
Motor
Sensor (temperature,
liquidlevel sensor)
Control devices (the
host PC, PLC etc.)
AreaB: interfacesof signalandcontrol cables,
correct immunitylevel is required.
AreaC: install noisesources such asinput reactor,
the inverter, brakingunit and contactor.
AreaD: install output EMIfilter and itscable
connection p
arts.
AreaE: power supply.
AreaF: install motor and itscables.
Earth isolatedboard
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