The User Manual of 580 Series General Frequency Converter

7.4.1 The requirement for shield cable

To meet the requirements for EMC marked by CE the shield cable with shielding layer shall be selected. The shield cable has three phase shield cable and four phase shield cable. If the electrical conductivity on shielding layer can not meet the requirements, a single PE line shall be added and otherwise, a four phase shield cable shall be used, among which, one line is PE line. It is shown as follows:

To restrain the emission and transmission of radio-frequency interference, the shielding layer of shield line is formed by coaxial copper braid and to increase shielding effectiveness and conductivity, the knitting tightness should be larger than 90%. It is shown as follows:

The grounding mode for shield cable is shown as follows:

屏蔽层接地

Shield layer grounding

Fig. 7-1 The diagram for shield cable grounding

Installation notes:

1) Shield balanced cables are recommended to use for all shield cables and for input cables, 4-core cable can be selected.

2) The motor cable and PE shielding lead (twisting shield) shall be as short as possible to decrease electromagnetic radiation, stray current outside cable and capacitating current. For the motor cable that is shorter than 100m, an output filter or an electric reactor shall be installed.

3) All control cables are advised to use shield cable.

4) The output power line for frequency converter is advised to use shield cable and shielding layer is required to ground. For the lead of interfered equipments, twisted pair shielding control line shall be selected and the shielding layer shall be properly grounded.