CABLING AND CONNECTIONS
43(110)
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, see Table 6-2 and Table 6-3;
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.
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.
For the definitions of EMC protection levels, see chapter 2.2.3.
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.
4
= Screened cable equipped with compact low-impedance
shield (NKCABLES /JAMAK, SAB/ÖZCuY-O or similar).
Note:
The EMC requirements are fulfilled at factory defaults of switching frequencies (all frames).