1-312 ACH550-UH User’s Manual
Technical data
Recommendation for conductor layout
The following figure compares conductor layout features in motor cables.
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).
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 above.
• 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 (at the bottom right-hand corner of the drive).
• 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
Symmetrical shielded cable: three phase
conductors and a concentric or otherwise
symmetrically constructed PE conductor, and a
shield
Recommended (CE & C-Tick)
PE
Conductor
and Shield
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 (CE & C-Tick)
Shield
PE
PE
Allowed for motor cables with phase
conductor cross section up to 10 mm
2
.
A four-conductor system: three phase
conductors and a protective conductor, without a
shield.
Allowed (CE & C-Tick)
Shield
Shield
Insulation Jacket
Braided Metallic Screen
Inner Insulator
L1
L2
L3
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