
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
2019/04/17
3ADR010121, 13, en_US
1216