Siemens 6SL3210-1SE23-8AA0 — guidelines for Cabinet Design and Equipotential Bonding Requirements [265/318]

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Cabinet design and EMC for components, Blocksize format

9.7 Protective connection and equipotential bonding

Manual

Manual, 01/2011, 6SL3097-4AC10-0BP2

265

When installing components on standard mounting rails, the data listed in the table also

apply to the equipotential bonding. If only smaller connection cross-sections are permissible

at the components, then the largest possible cross-section should be used, e.g. 6 mm

for

SMC. These requirements also apply to distributed components located outside the control

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, high leakage currents that could destroy the

Control Unit or other PROFIBUS nodes can be conducted via the PROFIBUS cable.

No equipotential bonding conductors are required for PROFIBUS inside a control cabinet.

For PROFIBUS connections between different buildings or parts of buildings, an

equipotential bonding must be laid parallel to the PROFIBUS cable. The following cross-

sections must be observed in accordance with IEC 60364-5-54:

● Copper 6 mm²

● Aliminium 16 mm²

● Steel 50 mm²

For more information about equipotential bonding for PROFIBUS, see:

http://www.profibus.com/fileadmin/media/wbt/WBT_Assembly_V10_Dec06/start.html

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.

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