5SHY3545L0003 ABB Drive control thyristor module

Description

The electromagnetic environment is everywhere but it varies
from place to place. The reason is that there are many different
sources of disturbance which can be natural or man-made.
Natural sources consist of electrical discharge between clouds,
lightning or other atmospheric disturbances. While we cannot
influence these sources we can protect our products and systems from their effects.
Man-made disturbances are those generated by, for example,
electrical contacts and semiconductors, digital systems like microprocessors, mobile radio transmitters, walkie-talkies, portable
car telephones and power drive systems.
Such a variety of equipment, each with its own emission characteristics, is often used so near to other electrical equipment
that the field strengths they create may cause interferences.
Key point:
It is important that all PDSs are immune to these natural and
man-made disturbances. While drives manufacturers strive to
make their products immune, the directive lays down minimum
standards for immunity, thereby ensuring all manufacturers
achieve the same basic level.