Emc-Compliant Setup; Introduction; Possible Effects Of Interference; Coupling Mechanisms - Siemens SIWAREX WT241 Manual

5.2

EMC-compliant setup

5.2.1

Introduction

The electronic weighing system described here was developed for use in industrial
environments and complies with high EMC requirements. Nevertheless, you should still carry
out EMC planning before installing your devices in order to determine any sources of
interference and include them in your considerations.
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.
5.2.2

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.
5.2.3

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
5.2.4

Five basic rules for securing EMC

Observe these five basic rules to secure EMC.
SIWAREX WT241
Manual, 05/2015, A5E36046748A
Installation
5.2 EMC-compliant setup
21