ABB ACS 400, Руководство пользователя, Страница: 174 / 187

ACS 400 User’s Manual 163
Figure 67 Cable recommendations and restrictions.
The general rule for cable screen effectiveness is: the better and tighter the screen of the cable, the
lower the radiated emission level. Example of an effective construction is presented in Figure 68.
Figure 68 Effective motor cable screen (e.g. Ölflex-Servo-FD 780 CP, Lappkabel or MCCMK, NK
Cables).
Clamp the cable shield into the gland plate at the converter 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
(at the bottom right-hand corner of the converter), if you are using cable without a separate PE
conductor.
At the motor end the motor cable screen must be earthed 360 degrees with an EMC cable gland
(e.g. ZEMREX SCG Screened cable glands) or the screen wires must be twisted together into a
bundle not longer than five times its width and connected to the PE terminal of the motor.
Symmetrical shielded cable: three phase
conductors and a concentric or otherwise
symmetrically constructed PE conductor,
and a shield
Recommended
PE
conductor
and shield
Shield
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.
Shield
PE
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.
Allowed
Insulation jacket
Braided metallic screen
Inner insulator
L1
L2
L3
http://nicontrols.com