Emc-Compliant Cabinet Design - Siemens sinamics g120 Hardware Installation Manual

Connecting
4.2 EMC-compliant installation
You have wired the inverter in an EMC-compliant fashion.
4.2.3

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.
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.
44
EMC-compliant wiring shown using the
example of a frame size A inverter
① Unshielded line supply cable
②
EMC clamps (serrated rails) on the
shield plate of the Power Module
③
Shielded cable to the braking resistor
(not available for all inverters)
④
EMC clamp for the cable to the termi-
nal strip on the shield plate of the CU
⑤
Shielded cable to the terminal strip
⑥
Shielded motor cable
Power Module PM230, IP20 / Push-through technology (PT)
Hardware Installation Manual, 06/2014, A5E34331322B AA