Equipotential Bonding - Siemens SIMATIC RF600 System Manual

RF600 system planning
4.8 Guidelines for electromagnetic compatibility (EMC)
Note
All coils in the cabinet should be suppressed. The valves and motor brakes are frequently
forgotten. Fluorescent lamps in the control cabinet should be tested in particular.
4.8.6

Equipotential bonding

Potential differences between different parts of a plant can arise due to the different design of
the plant components and different voltage levels. If the plant components are connected
across signal cables, transient currents flow across the signal cables. These transient currents
can corrupt the signals.
Proper equipotential bonding is thus essential.
● The equipotential bonding conductor must have a sufficiently large cross section (at least
10 mm
● The distance between the signal cable and the associated equipotential bonding conductor
must be as small as possible (antenna effect).
● A fine-strand conductor must be used (better high-frequency conductivity).
● When connecting the equipotential bonding conductors to the centralized equipotential
bonding strip (EBS), the power components and non-power components must be combined.
● The equipotential bonding conductors of the separate modules must lead directly to the
equipotential bonding strip.
Figure 4-18
The better the equipotential bonding in a plant, the smaller the chance of interference due to
fluctuations in potential.
76
).
2
Equipotential bonding (EBS = Equipotential bonding strip)
Draft Version 02.06.2010
System Manual, 06/2010, J31069-D0171-U001-A10-7618
SIMATIC RF600