Nx Networks NX series - Manual (Page 30)

30(86) Cabling and connections
6
6.1.1 Power 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.
6.1.1.1 Mains cable
Mains cables for different EMC levels in Table 6-1.
6.1.1.2 Motor cable
Motor cables for different EMC levels in Table 6-1.
6.1.1.3 Control 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).