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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
controllers
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
controller
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
darnage any external devices.
Lenze
37
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