Siemens Sinamics S120 Manual page 110

Cabinet design
6.9 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 mm
● Aluminum 16 mm
● Steel 50 mm
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
110
for TM31 and SMC). These requirements also apply to
2
2
2
2
Power Units in Booksize C/D-Type Format
Manual, 01/2017, 6SL3097-4AC20-0BP1