Shanghai Sigriner STEP Electric Co., Ltd.
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compatibility should also be realized in the control cabinet.
In the transmission system composed of inverter and motor, the inverter, braking unit and contactor
are all strong noise sources, which may affect the normal operation of noise-sensitive peripheral
devices such as automation devices, encoders and sensors. The peripheral devices can be installed in
different EMC areas according to their electrical characteristics, so as to realize spatial isolation of
noise source and noise receiver, which is the most effective measure to reduce interference.
The division of EMC installation area of the inverter is shown in Figure A-11.
Figure A-11 Schematic Diagram of EMC Installation Area of the Inverter
The division of the above installation areas is described as follows:
Area I: control power transformer, control device, sensor, etc.
Area II: control signal and its cable interface, requiring a certain immunity.
Area III: incoming line reactor, inverter, braking unit, contactor and other main noise sources.
Area Ⅳ: output noise filters and their wirings.
Area Ⅴ: power supply (including the wirings of radio noise filter).
Area Ⅵ: motor and its cables.
Each area should be isolated with a minimum distance of 20 cm to achieve electromagnetic
decoupling. Each area is best decoupled with the grounding partition, and the cables in different
areas should be put into different cable ducts. The filter (if necessary) should be installed at the
interface between the areas. All bus cables (such as RS485) and signal cables leading out of the
cabinet must be shielded.
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