Parker
Hannifin
All braid termination connections must remain secure. For small
diameter cables, it may be necessary to fold back the braid to increase
the effective diameter of the cable so that R-Clamps are secure.
Within the cabinet itself, all high-voltage cables should lie in the same
trunking as far as possible. Keep the cables separate from any low-level
control signal cables. This applies particularly where the control cables
run close to the cables providing power to motor drives, contactors,
relays, etc.
There must be no break in the 360° coverage that the screen provides
around the cable conductors.
A steel equipment cabinet will screen radiated emissions provided all
panels are bonded to a central earth point. Separate earth circuits are
commonly used within equipment cabinets to minimize the interaction
between independent circuits. A circuit switching large currents and
sharing a common earth return with another low-level signal circuit could
conduct electrical noise into the low level circuit, thereby possibly
interfering with its operation. For this reason, so called ‘dirty earth’ and
‘clean earth’ circuits may be formed within the same cabinet, but all
such circuits will eventually need to be returned to the cabinet’s main
star earth point.
Mount the individual controllers and the EMC filter (if your system
requires filters, see Table 65 on page 154) on a metal earth plane. The
earth plane will have its own individual star point earth that should be
hard wired (using an insulated copper conductor) back to the cabinet’s
‘clean earth’ connection point.
Panel mounting can provide a similar measure of EMC performance if
strict attention is paid to cable screen termination and cable layout.
Again, the machine builder’s primary focus should be on ensuring
operators are kept safe from all hazards.
•
Install a Mains filter. Installing with multiple ACR9000 and ACR9030
controllers require an EMC mains supply filter to meet EMC emission
requirements. It is recommended that the controllers are mounted on a
conductive panel which is shared with the EMC filters. If the panel has
a paint finish, it will be necessary to remove the paint in certain areas
to ensure filters and controller make a good large-area metal to metal
contact between filter case and panel.
Use Table 65 on page 154 to determine the correct filter for your
specific application.
Appendix G Regulatory Compliance 153
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