C-4 CE Guidelines
MN762
A) All metal conducting parts of the enclosure must be electrically connected to the back plane. These connections should
be made with a grounding strap from each element to a central grounding point. [1]
B) Keep the power wiring (motor and power cable) and control wiring separated. If these wires must cross, be sure they
cross at 90 degrees to minimize noise due to induction.
C) The shield connections of the signal and power cables should be connected to the screen rails or clamps. The screen
rails or clamps should be conductive clamps fastened to the cabinet. [2]
D) The cable to the regeneration resistor must be shielded. The shield must be connected to ground at both ends.
E) The location of the AC mains filter has to be situated close to the drive so the AC power wires are as short as possible.
F) Wires inside the enclosure should be placed as close as possible to conducting metal, cabinet walls and plates. It is
advised to terminate unused wires to chassis ground. [1]
G) To reduce ground current, use at least a 10mm
2
(6 AWG) solid wire for ground connections.
[1] Grounding in general describes all metal parts which can be connected to a protective conductor, e.g. housing of
cabinet, motor housing, etc. to a central ground point. This central ground point is then connected to the main plant (or
building) ground.
[2] Or run as twisted pair at minimum.
Example Cable Screens Grounding
Figure C-3
Cable (Twisted Pair Conductors)
Conductive Clamp - Must contact bare cable shield
and be secured to metal backplane.
