Earthing - ABB Advant AC500 Manual

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.
PE
120
Ohms
CS31 bus master
e.g. PM581
Cabinet 1
Figure: Direct earthing
____________________________________________________________________________________________________________
V2
AC500 Hardware
COM1
1
2
3
4
current-carrying connection
direct earthing of shields
when entering the cabinet
CS31
slave
Cabinet 2
current-carrying connection
1-38 System data
CS31
slave
AC500 / Issued: 05.2007