ABB ACQ550-x1-06A6-2 User Manual page 284

284
Effective motor cable shields
The general rule for cable shield effectiveness is: the better and tighter the cable's
shield, 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
The most efficient EMC filtering can be achieved by following these rules:
• Motor cables must have an effective shield as described in section
motor cable shields
• Motor cable shield wires must be twisted together into a bundle (pig-tail) – the
bundle length must be less than five times its width – and connected to the
terminal marked
• At the motor end, the motor cable shield must be earthed 360 degrees with an
EMC cable gland, or the shield wires must be twisted together into a bundle (pig-
tail) not longer than five times its width and connected to the PE terminal of the
motor.
• See section
280
drives for IEC/EN 61800-3 compliance.
WARNING! Do not use RFI/EMC filters on IT systems.
Technical data
Braided metallic shield
on page 284.
(at the bottom right-hand corner of the drive).
Motor cable length for 400 V
to check the maximum motor cable lengths and the need for filters for 400 V
Inner insulator
L2
L1
L3
drives, columns
ACQ550-U1 User's Manual
Effective
"EMC limits" on page