Siemens SIMATIC RF300 System Manual page 122

Planning the RF300 system
4.6 Guidelines for electromagnetic compatibility (EMC)
The ESD brushes do not have to be installed everywhere. However, you should ensure that the
pallet is always in contact with at least one ESD brush. The ESD brushes are usually mounted
either on a profile rail
conveyor wall.
Figure 4-19
Installation example without ESD brushes
As an alternative to installing ESD brushes, you can also provide the roller conveyor with EMC
grounding and instead of installing ESD brushes on the inside of the roller conveyor wall, you can
also install braided strips made of copper or other metal to prevent electrostatic charging.
4.6.8 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.
122
③
or in recesses provided for this purpose
Installation example of ESD brushes on/in the inside of the roller conveyor wall.
).
2
④
on/in the inside of the roller
System Manual, 02/2021, C79000-G8976-C345-09
SIMATIC RF300