Chapter 7 EMC
7.1 Definition
Electromagnetic compatibility (EMC) is the ability of the electric equipment to run in the
electromagnetic interference environment and implement its functions stably without
interfering with the electromagnetic environment.
7.2 Introduction to EMC Standard
In accordance with the requirements of China's national standard GB/T12668.3, the AC
drive must comply with the electromagnetic interference and anti-electromagnetic
interference requirements.
The CS500 applies the latest international standard IEC/EN 61800-3: 2004 (Adjustable
speed electrical power drive systems part 3: EMC requirements and specific test
methods), which is equivalent to China's national standard GB/T12668.3.
IEC/EN61800-3 assesses the AC drive in terms of electromagnetic interference and
anti-electronic interference. Electromagnetic interference mainly tests the radiation
interference, conduction interference and harmonics interference on the AC drive
(required if the AC drive is applied 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, electronic static
discharge (ESD) interference rejection and power low-frequency end interference
rejection. The specific test items involve:
1. Interference rejection tests of input voltage sag, interrupt and change
2. Commutation 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
Being tested strictly in accordance with the above requirements of IEC/EN61800-3 and
used according to section 7.3, the CS500 has good EMC capability in general industry
environment.
7.3 EMC Guideline
7.3.1 Harmonic Effect
Higher harmonics of power supply may damage the AC drive. Thus, at some places
where mains quality is rather poor, it is recommended to install an AC input reactor.
7.3.2 Electromagnetic Interference and Installation Precautions
Electromagnetic Interference
There are two types of electromagnetic interference, interference of electromagnetic noise
in the surrounding environment on the AC drive, and interference of the AC drive on the
surrounding equipment.
Installation Precautions
1. The grounding cables of the AC drive and other electric products must be well
grounded.
2. The power input and output power cables of the AC drive and weak current signal
cables (for example, control line) must not be arranged in parallel and vertical
arrangement is preferable.
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