Danfoss VLT AutomationDrive FC 300 Design Manual page 215

Electrical Installation
Illustration 7.56 shows an example of an EMC-correct electrical installation of an IP 20 frequency converter. The frequency
converter is fitted in an installation cabinet with an output contactor and connected to a PLC, which is installed in a
separate cabinet. Other ways of doing the installation could have just as good an EMC performance, provided the guidelines
to engineering practice are followed.
If the installation is not carried out according to the guideline and if unscreened cables and control wires are used, some
emission requirements are not complied with, although the immunity requirements are fulfilled. See 3.5.2 EMC Test Results.
Mains-supply
L1
L2
L3
PE
Reinforced protective earth
Illustration 7.56 EMC-Correct Electrical Installation of a Frequency Converter in Cabinet
®
VLT AutomationDrive FC 300 Design Guide 90-1200 kW
Panel
PLC etc.
PLC
2
Min. 16 mm
Equalizing cable
Control cables
Min. 200mm
between con-
trol cables,
motor cable and
mains cable
MG34S202 - Rev. 2013-08-19
Output con-
tactor etc.
Earthing rail
Cable insula-
tion stripped
All cable entries in
one side of panel
Motor cable
Motor, 3 phases and
Protective earth
7 7
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