TREND NX Variable Speed Drives - Manual (Page 58)

CABLING AND CONNECTIONS vacon • 41
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6
6. CABLING AND CONNECTIONS
6.1 Power unit
6.1.1 Power connections
6.1.1.1 Mains and motor cables
The mains cables are connected to terminals L1, L2 and L3 and the motor cables to terminals marked with
U, V and W. A cable entry gland should be used when installing the motor cable at both ends in order to
reach the EMC levels. See Table 6-1 for the cable recommmendations for different EMC levels.
Use cables with heat resistance of at least +70
°
C. The cables and the fuses must be dimensioned according
to the frequency converter nominal OUTPUT current which you can find 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 6.1.6.
Table 6-2 and Table 6-3 show the minimum dimensions of the Cu-cables and the corresponding fuse sizes.
Recommended fuse types: gG/gL (for FR4 to FR9), see Table 6-2 and Table 6-3;
If the motor temperature protection of the drive (see Vacon All in One 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.
1 st environment 2 nd environment
Levels C and H Cable type
unrestricted restricted
Level L Level T Level N
Mains cable 1 1 1 1
Motor cable 3* 2 2 2
Control cable 4 4 4 4
Table 6-1. Cable types required to meet standards.
Level C = EN 61800-3+A11, 1 st environment, unrestricted distribution
EN 61000-6-4
Level H = EN 61800-3+A11, 1 st environment, restricted distribution
EN 61000-6-4
Level L = EN61800-3, 2 nd environment
Level T: See page 9.
Level N: See page 9.
1 = Power cable intended for fixed installation and the
specific mains voltage. Shielded cable not required.
(NKCABLES/MCMK or similar recommended)
2 = Symmetrical power cable equipped with concentric
protection wire and intended for the specific mains
voltage.
(NKCABLES /MCMK or similar recommended).
3 = Symmetrical power cable equipped with compact low-
impedance shield and intended for the specific mains
voltage.
(NKCABLES /MCCMK, SAB/ÖZCUY-J or similar recommended).
*360º earthing of the shield with cable glands in both ends needed for EMC
levels C and H.