Equipotential Bonding - Siemens SINAMICS S120 Equipment Manual

Cabinet Design and EMC
12.5 Electromagnetic Compatibility
12.5.3

Equipotential Bonding

The SINAMICS S booksize drive system is designed for use in cabinets with a PE conductor
connection.
If the drive line-up is arranged on a common unpainted metal-surfaced mounting plate, e.g.
with a galvanized surface, no additional equipotential bonding is needed within the drive line-
up as
• All parts of the switchgear assembly are connected to the protective conductor system.
• The mounting plate is connected with the external PE conductor by means of a finely-
For other installation methods, equipotential bonding must be implemented using conductor
cross-sections as stated in the second item in the list or at least equal to the conductance.
If components are mounted on DIN rails, the data listed in the second item applies for
equipotential bonding. If only smaller connection cross-sections are permissible on
components, the largest must be used (e.g. 6 mm
also apply to distributed components located outside the cabinet.
Equipotential bonding must also be provided for the back wall. If, for example, the
PROFIBUS or DRIVE-CLiQ cable is routed through several cabinets, the control unit
interface "PROFIBUS equipotential bonding conductor connection" must be used for
connecting the equipotential bonding conductor. A finely stranded copper conductor with a
4 mm² cross-section must be used. This conductor must be routed together with the
PROFIBUS cable.
12-24
stranded copper conductor with a cross-section of 16 mm², including the outer conductor.
As of a cross-section of 25 mm² copper, the outer cross-section of the finely-stranded
conductor is halved.
for TM31 and SMC). These requirements
2
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2