Alternative Power Cable Types; Motor Cable Shield - ABB ACS355 User Manual

Alternative power cable types

Power cable types that can be used with the drive are presented below.
Motor cables
(recommended for input cables also)
Symmetrical shielded cable: three phase
conductors, a concentric or otherwise
symmetrically constructed PE conductor
and a shield
PE
conductor
and shield
Allowed as input cables
A four-conductor system: three phase
conductors and a protective conductor

Motor cable shield

To function as a protective conductor, the shield must have the same cross-sectional
area as the phase conductors when they are made of the same metal.
To effectively suppress radiated and conducted radio-frequency emissions, the shield
conductivity must be at least 1/10 of the phase conductor conductivity. The
requirements are easily met with a copper or aluminium shield. The minimum
requirement of the motor cable shield of the drive is shown below. It consists of a
concentric layer of copper wires. The better and tighter the shield, the lower the
emission level and bearing currents.
Insulation jacket
Planning the electrical installation 39
Note: A separate PE conductor is required
if the conductivity of the cable shield is not
sufficient for the purpose.
Shield
PE
Copper wire screen
Shield
PE
Shield
PE PE
Cable core