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4.6
EMC compliant connection
4.6.1
Avoiding electromagnetic interference
Figure 4-13
Installation in conformance with EMC requirements is only possible using simultaneous
filtering, grounding and shielding.
The most important installation rules for converter and drive systems are described in the
following sections.
4.6.2
EMC-compliant cabinet design
The most cost-effective method of implementing interference suppression measures within
the control cabinet is to ensure that interference sources and potentially susceptible
equipment are installed separately from each other. This separation must be taken into
account already during the planning phase.
EMC zone concept within the control cabinet
The control cabinet has to be divided into EMC zones and the devices within the control
cabinet have to be assigned to these zones. The following example explains the zone
concept in greater detail.
The zones must be decoupled electromagnetically. This decoupling can, for example, be
achieved with large physical separations (approx. 25 cm). Better and space-saving is
decoupling using separate metal enclosures or large metal partitions.
Cables within each zone can be unshielded. Cables of different zones must be separated
and must not be laid in shared cable harnesses or cable ducts. Where necessary, filters
and/or coupler blocks must be deployed at the zone interfaces. Coupler blocks with electrical
isolation can effectively prevent the interference propagation between the zones.
All communication and signal cables that exit the control cabinet must be shielded.
Additional isolation amplifiers must be used for longer analog signal cables. Sufficient space
for connecting the cable shields must be provided, whereby the braided cable shield must be
connected to the cabinet ground with excellent electrical conductivity and with a large
contact area.
Power Module PM330
Hardware Installation Manual, 10/2016, A5E32844552B AD
EMC measures
Connecting up, switching on
4.6 EMC compliant connection
49
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