Fig. 206: Correct
Fig. 207: Wrong
In order to avoid disturbance, the cable shields must be earthed directly.
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
Slave
COM1
1
5
6
9
120 Ω
270 Ω
270 Ω
2 4
3 3
1
CS31
Master
Fig. 208: Direct earthing
1 Direct earthing with clip or steel plate
2 Earth of Cabinet 1
3 Current-carrying connection
4 Earth of Cabinet 2
Earthing
Case A
System Assembly, Construction and Connection
AC500-eCo > Connection and Wiring
2019/04/173ADR010121, 13, en_US1216
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