Baldor MN1851 manual EMC Installation Instructions, Cable Screens Grounding

EMC Installation Instructions

To ensure electromagnetic compatibility (EMC), the following installation instructions should be completed. These steps help to reduce interference. Consider the following:

•Grounding of all system elements to a central ground point

•Shielding of all cables and signal wires

•Filtering of power lines

A proper enclosure should have the following characteristics:

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 . 

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. 

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. 

G)To reduce ground current, use at least a 10mm2 (6 AWG) solid wire for ground connections.

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.

Or run as twisted pair at minimum.

Cable Screens Grounding

Cable (Twisted Pair Conductors)

Conductive Clamp – Must contact bare cable shield

and be secured to metal backplane.

MN1851 CE Guidelines 8-3