A The PE conductor and the shield
C The shield
B The PE conductors
Illustration 14: Cables with PE Conductors
In all the enclosure sizes, to comply with the EMC standards, use the default values of the switching frequencies.
If installing 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
6.6 Installation in an IT System.
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 FR4-9 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.
CAUTI 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 with a grounding conductor that is connected to the grounding terminal that is
identified with the PE symbol.
Electrical Installation
Operating guide | VACON® NXS/NXP Air-cooled
DPD00910G
42 | Danfoss A/S © 2018.06
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