Equipotential Bonding - Siemens SINAMICS S120 Equipment Manual

9.1.4

Equipotential bonding

All components in the cooling system (SINAMICS units, heat exchanger, piping system,
pump, pressure compensator, etc.) must be connected to an equipotential bonding system.
This must be realized using a copper bar or stranded copper with the appropriate conductor
cross-sections to prevent electrochemical processes from occurring.
If the installation comprises more than one control cabinet, they must be bolted together to
establish a good electrical connection (e.g. bolt cabinet cross-beams together directly at
several points to establish a good electrical connection). This eliminates potential differences
and thus the risk of electrochemical corrosion. A PE bar must be installed in every cabinet
(including the recooling system) and the individual bars then interconnected.
Water-cooled chassis power units for common cooling circuits
Manual, 08/2017, 6SL3097-4AM10-0BP0
Cooling circuit, coolant properties and protection against condensation
9.1 Cooling circuits
259