BECKHOFF AX5000 60 A - 170 A - Manual (Page 39)

BECKHOFF Drive Technology 7 Project planning – important information
AX5000 Version: 1.4 39
7.3 EMC, earthing, screen connection and potential
The AX5000 corresponds to EMC category "C3" (industrial sector) in terms of conducted
interference emissions. If you wish to use components which comply with a higher category
you can limit the AX5000 conducted interference emissions with the aid of additional filters
to such a degree that this complies with the EMC category "C2" (residential and industrial
environment) or "C1" (residential environments).
Ensure that there is adequate earthing (large-area low-impedance connection) of all relevant
components (incl. control cabinet). The AX5000 incl. periphery, control cabinet, machine bed
and motors must be at the same potential, as the AX5000 control quality will suffer under
differing potentials and operational malfunction may result. Using the screen connection for
potential equalisation is not permitted. If you are unable to provide a uniform reference
potential you need to lay potential equalisation cables of adequate dimensions.
Smooth operation is only guaranteed by faultless screen connections of the cables. The
screens must be applied generously at both ends and must on no account be disconnected.
Use Beckhoff motor and feedback cables as these are optimally adapted to the drive system
and reduce interference to a minimum. Ensure that the connectors and cables are properly
connected.
7.4 Control cabinet
The dimensions of the control cabinet must be sufficient to accommodate all components
with the specified distances. Remember that high temperatures may necessitate forced
cooling. Position the control cabinet as close as possible to the machine so that the motor
cables can be as short as possible.
In addition, the control cabinet should have an earthed metal rear panel to which the
AX5000 incl. periphery are attached so that safe earthing can be guaranteed. If you are
unable to guarantee these conditions you need to earth the AX5000 and the relevant
components using an approved cable of adequate size.