The Zone Concept - Siemens SINAMICS S120 Equipment Manual

Cabinet Design and EMC
7.3 EMC-compliant drive installation
7.3.3

The zone concept

The most cost-effective method of implementing EMC interference suppression measures
within the cabinet is to ensure that noise sources and potentially susceptible equipment are
installed separately from each other. This can be considered during the planning phase. A
distinction is made here between noise sources (e.g. Power Module, Basic Line Modules,
Motor Modules) and potentially susceptible equipment (e.g. automation devices, sensors,
encoders).
The system is then divided into different EMC zones to which the devices are assigned.
Different requirements regarding interference and noise immunity apply within each zone.
When the cabinet is designed, the individual zones must be kept physically separate from
each other. They can be separated by means of metal housing or – within a cabinet – by
means of grounded separators. Filters may have to be installed at the zone interfaces.
Unshielded cables can be used within a zone. All bus and signal cables that leave the
cabinet must be shielded.
Fig. 7-4
7-8
Dividing a drive system into zones
SINAMICS S120 Equipment Manual, Edition 04/2007, 6SL3097-2AM00-0BP2
Chassis Power Units Liquid Cooled