Siemens SINAMICS DCM Manual page 510

Wiring example for a USS bus
1) The shields for the interface cables must be connected directly on the devices (using a clamp, for example) to de-
vice or cabinet ground, with a low level of impedance.
2) Twisted cable, e.g. LIYCY 2×0.5 mm
that the difference in ground potentials between the link partners remains below 7 V.
Figure 10-60 USS bus
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
; with longer cables, an equipotential bonding cable should be used to ensure
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Descriptions of functions
10.8 Serial interface with USS protocol
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