ABB RDNA-01 Bedienungsanleitung PDF herunterladen (Seite 288)

288 ACS550-01/U1 User’s Manual

Technical data

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).

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 Effective

motor cable shields on page 288.

• 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 bottom right-hand corner of the drive).

• 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 Motor cable length for 400 V drives, columns “EMC limits” on page

284 to check the maximum motor cable lengths and the need for filters for 400 V

drives for IEC/EN 61800-3 compliance.

WARNING! Do not use RFI/EMC filters on IT systems.

Insulation jacket

Braided metallic shield

Inner insulator

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ABB RDNA-01 Bedienungsanleitung Seite 288