Wiring
4-6
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Diverting interference current
When modules are operated with ungrounded reference potential, any interference
current is discharged to the protective conductor via RC networks that are
integrated in the IM 157 and the DP/PA coupler (see Figure 4-3).
M
L
+
M
Ground bus
M
22 nF
10 MΩ
Integrated RC network
Figure 4-3 Configuration with ungrounded reference potential
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