01/02 AWB8230-1413GB
EMC compliance
21
The fixing screw sizes are listed in the table below:
Table 2: Fixing screw sizes
EMC compliance
EMC-compliant installation
The frequency inverters operate with fast electronic switching
devices e.g. transistors (IGBT). For this reason, radio interference
can occur on the frequency inverter’s output, which may effect
other electronic devices in the direct vicinity, such as radio
receivers or measurement instruments. To protect against this
radio frequency interference (RFI), the devices should be screened
and installed as far away as possible from the frequency inverters.
For an EMC-compliant installation, we recommend the following
measures:
• 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 and
immediately adjacent to the frequency inverter.
• Use of screened motor cables (short cable lengths).
X Earth the metallic enclosure using a cable which is as short as
possible (a fig. 9).
Using the radio interference filter
The RFI filter should be installed immediately adjacent to the
frequency inverter. The connection cable between the frequency
inverter and filter should be as short as possible. If cables are
longer than 30 cm, use screened cables.
The mounting surfaces for the frequency inverter and radio
interference filter should be as free as possible from paint and oil
residue.
Up to size DF6-340-30K frequency inverters, the assigned
DE6-LZ... radio interference filters (a section “RFI filter”,
page 166) are mounted underneath the inverter (footprint
mounting).
DF6-340-... a b
11K
15K
189 246
18K5
22K
30K
229 376
37K
265 510
45K
55K
75K
300 520
90K
110K
300 670
132K
380 710
Figure 9: DF6 and radio interference filters in an insulated metal
enclosure
Z1: RFI filter
G1:Frequency inverter
a Screened motor cable
Figure 10: Footprint mounting
Z1
G1
6
Uh
E
M
3h
E
a
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