Emc-Compliant Cabinet Design - Siemens PM240-2 Hardware Installation Manual

Connecting-up
5.3 EMC-compliant installation
5.3.4

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 interference sinks are spatially
separated.
EMC zone concept within the control cabinet
Split up the complete control cabinet into EMC zones.
Electromagnetically decouple the zones from one another, either using large clearances
(approximately 25 cm) – or using a separate metal enclosure or sheet metal partition with a
large surface area. Assign the various devices to zones in the control cabinet.
Classification of the control cabinet or the drive system into EMC zones
Non-shielded cables can be used within a zone. It is not permissible to route cables of
various zones in common cable harnesses or common cable ducts.
If necessary, you must use filters and/or coupling modules at the interfaces of the zones.
Use shielded cables for all communication and signal cables that exit the control cabinet.
Connect the shields to the cabinet ground through a large surface area and low ohmic
connection. Ensure that there are no potential differences between these zones, to avoid
inadmissibly high equalization currents flowing through the cable shields.
54
• Zone A:
Line supply connection
Limit values for conducted
interference emission and
interference immunity must not
be exceeded.
• Zone B:
Power electronics
Sources of interference
• Zone C:
Controller and sensors
Interference sinks
Zone D:
Motor, braking resistor and
corresponding cables
Sources of interference
Hardware Installation Manual, 12/2015, A5E33294624B AD
Power Module PM240-2