Recommendation For Conductor Layout; Effective Motor Cable Screens - ABB ACS550-01 User Manual

ACS550 User's Manual
constructed PE conductor is always recommended. The following figure shows the
minimum requirement for the motor cable screen (for example, MCMK, NK Cables).
Insulation Jacket
* Input filters designed for ACS550 cannot be used in an isolated, or high impedance earthed industrial
distribution network.

Recommendation for Conductor Layout

The following figure compares conductor layout features in motor cables.
Symmetrical shielded cable: three phase
conductors and a concentric or otherwise
symmetrically constructed PE conductor, and a
shield
Not allowed for motor cables (CE & C-Tick)
A four-conductor system: three phase
conductors and a protective conductor, without a
shield.

Effective Motor Cable Screens

The general rule for cable screen effectiveness is: the better and tighter the screen
of the cable, the lower the radiated emission level. The following figure shows an
example of an effective construction (for example Ölflex-Servo-FD 780 CP,
Lappkabel or MCCMK, NK Cables).
Insulation Jacket
Clamp the cable shield into the gland plate at the drive end and twist the cable
screen wires together into a bundle not longer than five times its width and connect it
to the terminal marked
using cable without a separate PE conductor.
Copper Wire Screen
Recommended (CE & C-Tick)
PE
Conductor
and Shield
PE
Braided Metallic Screen
(at the bottom right-hand corner of the drive), if you are
Helix of Copper Tape Inner Insulation
Cable Core
Allowed (CE & C-Tick)
A separate PE conductor is required if the
conductivity of the cable shield is < 50% of the
conductivity of the phase conductor.
Shield
Allowed for motor cables with phase
conductor cross section up to 10 mm
Inner Insulator
L2
L1
L3
11
Shield
PE
Shield
2
.
Installation