Siemens S120 - Page 439

Cabinet design and EMC for components, Blocksize format
10.7 Protective connection and equipotential bonding
AC Drive
Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
439
NOTICE
Component destruction as a result of high leakage currents
The Control Unit or other PROFIBUS and/or PROFINET nodes can be destroyed, if
significant leakage currents flow via the PROFIBUS or PROFINET cable.
• Use a functional equipotential bonding conductor with a cross-section of at least 25 mm²
between components of a plant or system that are located at a distance from each
other.
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
Non
-observance of the above guidelines on functional equipotential bonding can lead to
faults on the fieldbus interfaces or to malfunction of the devices.
Note
PROFINET
For installation guidelines and information of protective groun
ding and equipotential bonding
for all PROFINET types and topologies, refer to DOWNLOADS at:
http://www.profibus.com