Basics and Assembly
Wieland Electric GmbH | BA000941 | 01/2014 (Rev. A)
21
Remedy:
Match configuration and hardware structure.
Behavior:
After PowerON all of the RUN LEDs up to the defective module are
flashing. With all following modules the MF LED is on and the RUN LED is
off.
Reason:
The module on the right of the flashing modules is defective.
Remedy:
Replace the defective module.
3.7
Installation guidelines
The installation guidelines contain information about the interference free deployment of
system
ricos
FLEX. There is the description of the ways, interference may occur in your
control, how you can make sure the electromagnetic digestibility (EMC), and how you
manage the isolation.
Electromagnetic digestibility (EMC) means the ability of an electrical device, to function
error free in an electromagnetic environment without being interferenced res. without
interferencing the environment.
All system
ricos
FLEX components are developed for the deployment in industrial
environments and fulfill 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:
•
Electromagnetic fields (RF coupling)
•
Magnetic fields with power frequency
•
I/O signal conductors
•
Bus system
•
Current supply
•
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.
One differs:
•
galvanic coupling
•
capacitive coupling
•
inductive coupling
•
radiant coupling
In the most times it is enough to take care of some elementary rules to guarantee the
EMC. Please regard the following basic rules when installing your PLC.
•
Take care of a correct area-wide grounding of the inactive metal parts when installing
your components.
−
Install a central connection between the ground and the protected earth conductor
system.
−
Connect all inactive metal extensive and impedance-low.
−
Please try not to use aluminum parts. Aluminum is easily oxidizing and is therefore less
suitable for grounding.
Module failure
General
What means
EMC?
Possible
interference
causes
Basic rules for
EMC
RUN
MF
RUN
MF
RUN
MF
RUN
MF
RUN
MF
RUN
MF
RUN
MF
RUN
MF
RUN
MF
RUN
MF