ABB Advant AC500 - Earthing, EMC, and Power Management; Earthing and EMC Guidelines

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V2 AC500 Hardware 1-38 System data AC500 / Issued: 05.2007
Earthing
In order to avoid disturbance, the cable shields must be earthed directly.
Case a:
Multiple switch-gear cabinets: If it can be guaranteed that no potential differences can occur between the
switch-gear cabinets by means of current-carrying metal connections (earthing bars, steel constructions
etc.), the direct earthing is chosen.
CS31
Shield
BUS 2 BUS 1
slave
CS31 system bus
CS31
slave
CS31 system bus
1
2
3
4
120
Ohms
COM1
PE
CS31 bus master
e.g. PM581
Cabinet 1 Cabinet 2
current-carrying connection current-carrying connection
direct earthing of shields
when entering the cabinet
Figure: Direct earthing