-
Cable
type
Category C1 and C2
(1)
Category C3
(2)
Category C4
(2)
No EMC protection
(2)
We recommend an NKCABLES/MCMK cable.
Control
cable
A shielded cable with a compact low-impedance shield, for example an NKCABLES/ JAMAK, or an SAB/ÖZCuY-O
cable.
1
1
st
environment
2
2
nd
environment
For the definitions of EMC protection levels, see IEC/EN 61800-3 + A1.
A
C
B
e
3
0
b
g
0
7
9
.1
0
Illustration 15: Cables with PE Conductors
A
The PE conductor and the shield
B
The PE conductors
C
The shield
In all the enclosure sizes, to comply with the EMC standards, use the default values of the switching frequencies.
When using a safety switch, make sure that the EMC protection continues from the start of the cables until their ends.
The drive must obey the standard IEC 61000-3-12. To obey it, the short circuit power S
SC
must be a minimum of 120 R
SCE
at the
interface point between mains and the public mains. Make sure to connect the drive and the motor to mains with a short circuit
power S
SC
that is a minimum of 120 R
SCE
. If necessary, contact the mains operator.
6.2.1 Installation in a Corner-grounded Network
Corner-grounding can be used with the drive types (FR4 to FR9) with a rating of 3–300 A with a 208–240 V mains, and 261–730 A
with a 380–500 V mains. In these conditions, change the EMC protection level to C4. See the instructions in
.
Do not use corner-grounding with the drive types (FR4 to FR8) with a rating of 3–205 A with a 380–500 V mains or with a 525–690 V
mains.
Corner-grounding is permitted for the FR4–FR9 drives (main voltage 208–240 V) up to 3000 m and for the FR9–FR11 drives (main
voltage 380–500 V) up to 2000 m.
6.3 Grounding
Ground the AC drive in accordance with applicable standards and directives.
C A U T I O N
DAMAGE TO THE AC DRIVE FROM INSUFFICIENT GROUNDING
Not using a grounding conductor can damage the drive.
Make sure that the AC drive is always grounded with a grounding conductor that is connected to the grounding terminal
that is identified with the PE symbol.
AQ275638903263en-000601 / DPD00910 | 41
Danfoss A/S © 2022.12
Electrical Installation
VACON® NXS/NXP Air-cooled
Operating Guide
