Nx Networks NX series user manual Power connections, Mains cable, Motor cable, Control cable

30(86) Cabling and connections

6.1.1Power connections

Use cables with heat resistance of at least +60° C. The cables and the fuses must be dimensioned according to the frequency converter nominal OUTPUT current which can be found on the rating plate. Dimensioning according to the output current is recommended because the frequency converter input current never significantly exceeds the output current. Installation of cables according to UL regulations is presented in Chapter 6.1.3.

Table 6-2 shows the minimum dimensions of the Cu-cables and the corresponding GG/GL fuse sizes. The dimensions of the fuses in the table have been given taking their function as a cable overload protection into account.

If the motor temperature protection of the drive (see the Application Manual) is used as an overload protection, the cable shall be chosen accordingly. If three or more cables are used in parallel for bigger units each cable requires a separate overload protection.

These instructions apply only to cases with one motor and one cable connection from the frequency converter to the motor. In any other case, ask the factory for more information.

6.1.1.1Mains cable

Mains cables for different EMC levels in Table 6-1.

6.1.1.2Motor cable

Motor cables for different EMC levels in Table 6-1.

6.1.1.3Control cable

For information on control cables see Chapter 6.2.1.1 and Table 6-1.

Cable type	Level H
Mains cable	1
Motor cable	2
Control cable	4

Table 6-1. Cable types required to meet standards.

Level H = EN 61800-3, 1st environment

EN 50081-2

1= Power cable intended for fixed installation and the specific mains voltage. Shielded cable not required. (NNCABLES/MCMK or similar recommended)

2= Power cable equipped with concentric protection wire and intended for the specific mains voltage. (NNCABLES /MCMK or similar recommended).

3= Power cable equipped with compact low-impedance shield and intended for the specific mains voltage. (NNCABLES /MCCMK, SAB/ÖZCUY-J or similar recommended).

4= Screened cable equipped with compact low-impedance shield (NNCABLES /jamak, SAB/ÖZCuY-O or similar).

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