Equipotential Bonding - Siemens SINAMICS S120 Manual

9.5.3

Equipotential bonding

The SINAMICS S drive system is designed for use in cabinets with a PE conductor
connection.
The machinery construction OEM must carefully ensure that all of the conditions regarding
the assignment of the ground cable, ground connecting cables, protective conductor and
potential bonding cable connections and terminals are clearly specified in his Technical
User/Manufacturer Documentation, are clearly specified (this is especially important if there
are several protective conductor/potential bonding conductor connections/terminals in the
unit). It is especially important to note that the connections for potential bonding cables that
exist in parallel to connections for protective connecting cables may not be used to loop-
through the protective connecting cable.
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.
CAUTION
An equipotential bonding conductor with a cross-section of at least 25 mm² must be used
between components in a system that are located a considerable distance from each other.
If an equipotential bonding conductor is not used, leakage currents that could destroy the
Control Unit or other PROFIBUS nodes can be conducted via the PROFIBUS cable.
AC Drive
Manual, (GH6), 07/2007 Edition, 6SL3097-2AL00-0BP2
9.5 Information about electromagnetic compatibility (EMC) and cable routing
stranded copper conductor with a cross-section of 16 mm², including the outer conductor.
From a cross-section of 25 mm² copper, the outer cross-section of the finely-stranded
conductor is halved.
Cabinet Design and EMC for Components, Blocksize Format
for TM31 and SMC). These requirements
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