Cabinet Design and EMC Booksize
9.5 Information about electromagnetic compatibility (EMC) and cable routing
Booksize power units
522 Manual, (GH2), 06/2008, 6SL3097-2AC00-0BP6
9.5.3 Equipotential bonding
The SINAMICS S Booksize drive system is designed for use in cabinets with a PE conductor
connection.
The machine OEM has to ensure that all conditions with regard to the assignment of ground
cable connectors, protective conductor and equipotential bonding conductor connectors and
terminals are indicated clearly in the Technical User Manual/Manufacturer Documentation
(extremely important when several protective conductor/equipotential bonding conductor
connections/terminals are available in the device). A special note must be made for
connectors/terminals for equipotential bonding connections that are available in parallel with
protective ground connection cables, indicating that they must not be used for looping
through the protective ground 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-
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.
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
2
for TM31 and SMC). These requirements
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 at a 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.
Create a low-impedance ground connection for additional cabinets, system components, and
distributed devices with the largest possible cross-section (at least 16 mm²). Other system
and machine components must also be integrated in the equipotential bonding concept. The
PE conductor for the motors used must be connected via a PE conductor within the motor
cable.
NOTICE
If the above information about equipotential bonding is not taken into account, this can
cause the field bus interfaces to malfunction or devices to malfunction.
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