Lenze 8615E - Manual (Page 37)

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5.4 Screenings
Cable screenings increase the noise immunity of the drive system
and reduce the interfering radiation.
The power and control terminals of the inverters are noise immune
without screened cables up to severity class 4 to IEC 801-4. Burst
of 4kV on the power terminals and 2kV on the control terminals are
permissible.
Screenings are only required when you want to operate the inverter
in environments, where severity class 4 is not sufficient.
If your drive corresponds to the CE-typical drive system and you do
not want to carry out the radio-interference measurements
necessary for the conformity, screened cables are required.
5.5 Grounding of control electronics
The grounding of the control electronics is to ensure that the
potential of the control electronics does not exceed 50V to PE
(housing).
Single drives
Bridge the control terminals GND and PE.
Network of several drives
Avoid GND loops. Lead all GND cables to external, insulated
central points, centralize again from there and connect to PE in the
central supply.
Make sure that the grounding of the control electronics does not
damage any external devices.