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CE Guidelines C-3MN1942

C.1.5 EMC installat ion suggestions
To ensure electromagnetic compatibility (EMC), the following installation points should be
considered to help reduce interference:
HEarthing/groundingof allsystem elements toa central earth/groundpoint (s tar point)
HShieldingof all cables ands ignal wires
HFilteringof pow er lines.
Aproper enc losure should have the following characteristics :
HAllmetal conducting parts of the enclosure mus t be electrically connected to the back plane.
Thesec onnections should be made with an earthing/grounding strap fr omeac h element to
acentral ear thing/grounding point (star point). *
HKeepthe power w iring (motor and power cable) and contr ol wiring separated. If these wires
mustc ross, be sure they cross at 90 degrees tominimize nois e due to induction.
HThe shield connections of the signal and power cables should be connect ed to the shield
rails or clamps. The shield rails or clamps should be conductiv e clamps fastened to the
cabinet.**
HThec able to the regeneration resistor must be shielded. The shield must be connected to
earth/groundat bot h ends.
HThelocation of theAC filter hasto be s ituated close to the drive so the AC power wires are
ass hortas pos sible.
HWires inside the enclosure should be placed as close as pos sible to conducting metal,
cabinetw alls and plates. It is advised to terminate unused wires to c hassis ground.*
HTor educe earth/ground current, use the largest suitable wire available for ear th/ground
connections.
*Earthing/grounding in general describes all metal parts which can be connected t o a
protective conductor, e.g. housing of cabinet, motor housing, etc. to a central earth/ground
point(st ar point). This central earth/ground point (star point) is then c onnected to the main
plant(or building) earth/gr ound.
** Orr un as twisted pair at minimum.