Siemens SINAMICS S110 Manual page 238

Cabinet design and EMC for components, Blocksize format
10.6 Protective connection and equipotential bonding
Functional equipotential bonding with PE conductor connection
A mounting plate, which is connected with the PE conductor connection of the cabinet
through a low impedance connection, simultaneously serves as the functional equipotential
bonding surface. This means that no additional functional equipotential bonding is required
within the drive line-up.
If a common metallic bright mounting plate is not available, equally good equipotential
bonding must be ensured using the conductor cross sections listed in the table above or with
at least the same conductivity.
When installing components on standard mounting rails, the data listed in the table also
apply to the functional equipotential bonding. If only smaller connection cross sections are
permissible at the components, the largest possible cross section should be used, e.g.
6 mm
the cabinet.
NOTICE
Damage to components as a result of high leakage currents
The Control Unit or other PROFIBUS and/or PROFINET nodes can be damaged if
substantial leakage currents flow through the PROFIBUS or PROFINET cable.
• Use a functional equipotential bonding conductor with a cross section of at least 25 mm²
No functional equipotential bonding conductors are required for PROFIBUS inside a cabinet.
For PROFIBUS connections between different buildings or parts of buildings, a functional
equipotential bonding must be routed in parallel to the PROFIBUS cable. The following cross
sections must be observed in accordance with IEC 60364-5-54:
● Copper 6 mm²
● Aluminum 16 mm²
● Steel 50 mm²
You will find more information on equipotential bonding for PROFIBUS at:
http://www.profibus.com/fileadmin/media/wbt/WBT_Assembly_V10_Dec06/start.html
NOTICE
Damage to equipment due to inadequate functional equipotential bonding
Failure to heed the information provided above for functional equipotential bonding can
cause the faults in devices and disturb fieldbus interfaces.
Note
PROFINET
You will find installation guidelines and information on protective grounding and equipotential
bonding for all PROFINET types and topologies under DOWNLOADS at:
http://www.profibus.com
238
for SMC. These requirements also apply to distributed components located outside
2
between components of an installation that are located at a distance from each other.
SINAMICS S110
Manual, 07/2015, 6SL3097-4AC10-0BP5