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5. EMC
5-1. EMC compliant installation guidelines
The output of the inverter is PWM wave, which will produce electromagnetic noise when it works. In order to
reduce the interference of the inverter to the outside world, this section introduces the installation method of
EMC in noise suppression, field wiring, grounding, leakage current, power filter use and so on.
5-1-1. Noise suppression
Noise type
The noise generated by the operation of the frequency converter may affect the nearby instruments and
equipment. The degree of influence is related to the control system of the frequency converter, the anti-noise
ability of the equipment, the wiring environment, the safe distance, the grounding method and other factors. The
types of noise include: electrostatic induction, circuit transmission, space transmission, electromagnetic
induction, etc.
Basic countermeasures for noise suppression
When the grounding wire of peripheral equipment and the wiring of frequency converter form a
closed loop, the leakage current of the inverter grounding wire will cause the equipment to
misbehave. At this time, if the equipment is not grounded, it will reduce the misoperation.
When the power supply of peripheral equipment and the power supply of frequency converter
share the same system, the noise generated by the frequency converter propagates against the
power line, which will disturb other equipment in the same system. The following measures can
be taken to suppress the noise: installing electromagnetic noise filter at the input end of the
frequency converter. Use isolation transformer or power filter to isolate other equipment.
(1) Equipment and signal lines that are easy to be disturbed should be installed as far away from
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