Detecting And Eliminating Emc Interferences; Edsvf9333V En 3.0-06/2005 - Lenze 9300 vector Series System Manual

5 Wiring the standard device
5.2 Basics for wiring according to EMC
5.2.7

Detecting and eliminating EMC interferences

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

EDSVF9333V EN 3.0-06/2005