Emc-Compliant Installation; Introduction; Possible Effects Of Interference; Coupling Mechanisms - Siemens SIMATIC ET 200SP Operating Instructions Manual

3.3

EMC-compliant installation

3.3.1

Introduction

Overview
The electronic weighing system described here was developed for use in industrial
environments and complies with high EMC requirements. Nevertheless, before installing your
devices you should prepare an EMC plan and identify and take into consideration possible
interference sources.
EMC
EMC (electromagnetic compatibility) describes the capability of electrical equipment to operate
without errors in a given electromagnetic environment, without being subject to external
influence and without influencing external devices in any way.
3.3.2

Possible effects of interference

Electromagnetic interferences can influence the electronic weighing system described here in
various ways:
● Electromagnetic fields having a direct influence on the system
● Interferences transported by communication cables
● Interferences having an effect via process cables
● Interferences entering the system via the power supply and/or protective ground
Interferences can impair the fault-free functioning of the electronic weighing system.
3.3.3

Coupling mechanisms

Depending on the propagation medium (conducted or non-conducted) and the distance
between the interference source and the device, interferences can enter the faulty device
through four different coupling mechanisms:
● Electrical coupling
● Capacitive coupling
● Inductive coupling
● Radiation coupling
Technology module TM SIWAREX WP351 HF
Operating Instructions, 01/2020, A5E47521010-AA
Installing
3.3 EMC-compliant installation
19