Installation
09/01 AWB8230-1412GB
22
EMC compliance
EMC compliant installation
The frequency inverter operates with fast electronic switching
devices e.g. transistors (IGBT). For this reason, radio interference
can occur on the output of the frequency inverter, which may
effect other electronic devices located in the direct vicinity such as
radio receivers or measurement instruments. In order to offer
protection against this radio frequency interference (RFI), the
devices should be screened and installed as far away as possible
from the frequency inverters.
We recommend the following measures for EMC compliant instal-
lation:
• installation of the frequency inverter in a metallic, electrically
conducting enclosure with a good connection to earth.
• installation of a radio interference filter on the input of the
frequency inverter in its direct vicinity
• screened motor cables (short cable lengths).
X Ground the metallic enclosure via a cable which should be as
short as possible (a Fig. 9).
Radio interference filter usage
The RFI filter should be installed in the direct vicinity of the
frequency inverter. The connection cable between the frequency
inverter and filter should be as short as possible. Screened cables
are required if the length exceeds 30 cm.
The radio interference filters assigned for the DE5-LZ... series
(a Section ”Radio interference filter” in the Appendix,
Page 115) enable the installation below (foot-print) or on the side
(book-type) of the DF5 series frequency inverters.
Radio interference filters produce leakage currents which can be
significantly larger than the rated values in the event of a fault
(phase failure, load unbalance). The filters must be earthed before
use in order to avoid dangerous voltages. As the leakage currents
Figure 9: DF5 and radio interference filter in a sealed enclosure
Z1: RFI filter
G1:frequency inverter
a Screened motor cable
Z1
G1
6
Uh
E
M
3h
E
a
Figure 10: foot-print-Aufbau
Figure 11: Seitlicher Anbau
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