Recommendation For Conductor Layout; Effective Motor Cable Screens; En 61800-3 Compliant Motor Cables - ABB ACS550-01 User Manual

ACS550 User's Manual

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 cable's
screen, 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

EN 61800-3 Compliant Motor Cables

To comply with EN 61800-3 requirements:
• Motor cables must have an effective screen as described in "Effective Motor
Cable Screens" on page 227.
• Motor cable screen wires must be twisted together into a bundle (the bundle
length must be less than five times its width) and connected it to the terminal
marked
• Motor cables must be grounded, at the motor end, with an EMC cable gland. The
ground must contact the cable screen all the way around the cable.
• For EN 61800-3 First Environment, Restricted Distribution (CISPR11 Class A),
and EN 61800-3 Second Environment compliance, the drive includes an internal
filter that provides compliance for at least 30 m (100 ft.) motor cable lengths. For
some drives, longer cable lengths require an additional, external RFI/EMC filter
as specified in the table below. The RFI/EMC filters are separate options and
Recommended (CE & C-Tick)
PE
Conductor
and Shield
PE
Braided Metallic Screen
(at the bottom right-hand corner of the drive).
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
227
Shield
PE
Shield
2
.
Technical Data