Table of Contents
Advertisement
VIPA HMI
4
Installation Guidelines
4.1 Basic rules for the EMC-equitable assembly of installations
General
What does EMC mean?
Possible interference
causes
Coupling mechanisms and
interference sources
Coupling mechanism
Galvanic coupling
HB160 | TP | 62M-JID0 | en | 20-20
The installation guidelines contain information about the interference free deployment of a
PLC system. There is the description of the ways, interference may occur in your PLC,
how you can make sure the electromagnetic compatibility (EMC), and how you manage
the isolation.
Electromagnetic compatibility (EMC) means the ability of an electrical device, to function
error free in an electromagnetic environment without being interfered respectively without
interfering the environment.
The VIPA components are developed for the deployment in industrial environments and
meets high demands on the EMC. Nevertheless you should project an EMC planning
before installing the components and take conceivable interference causes into account.
Electromagnetic interferences may interfere your control via different ways:
n
Electromagnetic fields (RF coupling)
n
Magnetic fields with power frequency
n
Bus system
n
Power supply
n
Protected earth conductor
Depending on the spreading medium (lead bound or lead free) and the distance to the
interference cause, interferences to your control occur by means of different coupling
mechanisms.
There are:
n
galvanic coupling
n
capacitive coupling
n
inductive coupling
n
radiant coupling
The following table shows the four different coupling mechanisms, their causes and pos-
sible interference sources.
Cause
Galvanic or metallic coupling always
occurs, when two current circuits have
a common line.
Basic rules for the EMC-equitable assembly of installations
Typical source
n
Pulsed devices (Net influence from
transducers and foreign net
devices)
Starting motors
n
Different potential of component
n
cubicles with common current
supply
n
Static discharges
Installation Guidelines
43
Advertisement
Table of Contents
