Wiring the standard device
Basics for wiring according to EMC
Detecting and eliminating EMC interferences
5
5.2
5.2.7
5.2-6
EDSVF9333V EN 3.0-06/2005
5.2.7 Detecting and eliminating EMC interferences
Fault Cause Remedy
Interferences of
analog setpoints of
devices and
measuring systems
Unshielded motor cable
Use shielded motor cable
No extensive shielding Provide optimum shielding
according to instructions
Shield of the motor cable is
interrupted by terminal strips,
switches etc.
z Keep components separated
from all other parts by at least
100mm
z Use Motor choke
Additional, unshielded cables are
installed within the motor cable
(e.g. for motor temperature
monitoring)
Separate the additional cables and
shield them
Motor cable ends too long and
unshielded
Shorten unshielded cable ends to
maximally 40 mm
Conducted
interference level is
exceeded on the
supply side
Terminal strips for the motor
cable are directly installed next to
the supply terminals
Keep the terminals strips for the
motor cable separated from the
supply and other control terminals
by at least 100 mm
Mounting plate varnished Optimise PE connection:
z Remove varnish
z Use zinc-coated mounting plate
HF short circuit Check cable routing
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