Delta EB3000 Series User Manual page 450

A-1 Introduction
A-1-1 What is EMC
Electromagnetic Compatibility (EMC) is the ability of an electrical device to function properly in
electromagnetic environments. It does not emit electromagnetic noise to surrounding equipment and is
immune to interference from surrounding equipment. The goal is to achieve high immunity and low
emission; these two properties define the quality of EMC. In general, electrical devices react to high
and low frequency phenomena. High frequency phenomena are electrostatic discharge (ESD); pulse
interference; radiated electromagnetic field; and conducted high frequency electrical surge. Low
frequency phenomena refer to mains power harmonics and imbalance.
The standard emission and immunity levels for compliance depend on the installation location of the
drive. A Power Drive System (PDS) is installed in an industrial or domestic environment. A PDS in a
domestic environment must have lower emission levels and is allowed to have lower immunity levels.
A PDS in an industrial environment is allowed to have higher emission levels but must have more
severe immunity levels.
A-1-2 EMC for AC Motor Drive
When an AC motor drive is put into operation, harmonic signal will occur at the AC drive's power input
and output side. It creates a certain level of electromagnetic interference to the surrounding electrical
devices and the mains power network. An AC motor dive is usually applied in industrial environments
with a strong electromagnetic interference. Under such conditions, an AC drive could disturb or be
disturbed.
Installing the AC motor drive accurately will decrease EMC influences and ensure long-term stability of
the electricity system. It is strongly suggested to follow Delta's user manual for wiring and grounding. If
any difficulties or problems arise, follow the instructions and measures as indicated in this EMC
Standard Installation Guide.
Appendix A. EMC Standard Installation GuideEB3000
A-3