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4.2.9 Requirements for machines fed by frequency converters
4.2.9.1 Main cable
4.2.9.2 Earthing of main cable
4.2.9.3 Auxiliary cables
3BFP 000 063 R0101 REV D
In compliance with the EMC directive (89/336/ EEC, as amended by 93/68/EEC) it is required
that an AC machine fed with frequency converter is installed with screened cables as specified
below. For information on other equivalent cables, please contact your local ABB
representative.
The main supply cable between the machine and the frequency converter must be a symmetrical
three conductor screened cable in order to fulfil the radiated emission requirements stated in the
generic emission standard for industrial environment, EN 50081-2. For further information, see
ABB manual Grounding and cabling of the drive system (3AFY 61201998 R0125 REV A).
The compliance with EMC directive requires high-frequency earthing of the main cable. This is
achieved by a 360° earthing of the cable screens at the cable entries in both the machine and in
the frequency converter. The earthing at the machine is implemented for example by means of
the EMC ROX SYSTEM cable transits for shielded installations.
NOTE: 360° high-frequency earthing of cable entries is made in order to suppress
electromagnetic disturbances. In addition, cable screens have to be connected to
protective earth (PE) in order to meet safety regulations.
The auxiliary cables must be screened to meet the EMC requirements. Special cable glands
must be used for the 360° high-frequency earthing of the cable screens at the cable entries.
Manual for High Voltage Process Performance Motors
Mechanical and Electrical Connections - 35
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