Alternative Power Cable Types; Motor Cable Shield - ABB ACS800-31 Hardware Manual

Alternative power cable types


Power cable types that can be used with the drive are represented below.
Recommended
Symmetrical shielded cable: three phase conductors
and a concentric or otherwise symmetrically
constructed PE conductor, and a shield
PE conductor
and shield
A four-conductor
system: three phase
conductors and a
protective conductor
The following power cable type is not allowed.
PE

Motor cable shield


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 aluminum shield. The minimum
requirement of the motor cable shield of the drive is shown below. It consists of a
concentric layer of copper wires with an open helix of copper tape. The better and
tighter the shield, the lower the emission level and bearing currents.
Insulation jacket
Shield
PE
PE
Not allowed for motor cables
Symmetrical shielded cable with individual shields for each phase conductor
is not allowed on any cable size for input and motor cabling.
Copper wire screen
Planning the electrical installation 61
A separate PE conductor is required
if the conductivity of the cable shield
is < 50 % of the conductivity of the
phase conductor.
Not allowed for motor cables
with phase conductor cross
section larger than 10 mm
[motors > 30 kW (40 hp)].
Helix of copper tape
Shield
PE
Shield
2
Inner insulation
Cable core