Siemens SINAMICS S120 Manual page 738

Cabinet design and EMC Booksize
12.9 Protective connection and equipotential bonding
Functional equipotential bonding
For EMC reasons, the shield of the motor cable should be connected through a large surface
area both at the Motor Module as well as at the motor.
The drive line-up must be arranged on a single, bare metal mounting plate in order to comply
with the EMC limit values. The mounting plate must be connected to the protective conductor
connection of the control cabinet through a low impedance.
It simultaneously serves as a functional equipotential bonding surface. This means that no
additional functional equipotential bonding is required within the drive line-up.
If a single, bare metal mounting plate is not available, then equally good functional
equipotential bonding must be established using cable cross-sections as listed in the table
above or, as a minimum, with the same conductivity.
When mounting components on standard mounting rails, the data listed in the table apply. If
only smaller conductor cross-sections are permissible on components, the largest cross-
section must be used (e.g. 6 mm
distributed components located outside the control cabinet.
No functional equipotential bonding conductors are required for PROFIBUS inside a control
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
Additional information about equipotential bonding for PROFIBUS can be found at:
http://www.profibus.com/fileadmin/media/wbt/WBT_Assembly_V10_Dec06/index.html
Note
PROFINET
For installation guidelines and information of protective grounding and equipotential bonding
for all PROFINET types and topologies, refer to DOWNLOADS at:
http://www.profibus.com
738
for TM31 and SMC). These requirements also apply to
2
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
Booksize Power Units