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01/02 AWB8230-1415GB
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 recei-
vers 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).
DV6-340-...
a
b
075
1K5
2K2
4K0
5K5
130
241
11K
189
246
15K
18K5
22K
229
376
30K
265
510
37K
45K
55K
300
520
75K
90K
300
510
110K
132K
380
760
Figure 9:
DV6 and radio interference filters in an insulated metal
enclosure
Z1: RFI filter
G1:Frequency inverter
a
Screened motor cable
Z1
G1
6
U
h
E
M
3
h
E
a
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