•
•
•
The category changes when these properties in the AC drive change:
the level of electromagnetic disturbances
the requirements of a power system network
the installation environment (see the standard IEC/EN 61800-3 + A1)
Table 5: Available EMC Classes
EMC class
in IEC/EN
61800-3 +
A1
VACON
®
equiva-
lent
EMC
class
Description
Available for
C1
C
The best EMC protection. These AC drives have the nominal voltage of less than
1000 V. They are used in the 1st environment.
N O T I C E
If the protection rating of the AC drive is IP21 (UL Type 1), only the conducted
emissions are in the requirements of category C1.
380–500 V, FR4
to FR6, IP54 (UL
Type 12)
C2
H
Includes AC drives in fixed installations. These AC drives have the nominal voltage
of less than 1000 V. The category C2 AC drives can be used in the 1st and the 2nd
environment.
380–500 V, FR4
to FR9 and 208–
240 V, FR4 to
FR9
C3
L
Includes AC drives that have the nominal voltage of less than 1000 V. These AC
drives are used in the 2nd environment only.
IP21 (UL Type 1)
and IP54 (UL
Type 12) in
380–500 V FR10
and larger, 525–
690 V FR6 and
larger
C4
T
These AC drives comply with the standard IEC/EN 61800-3 + A1 if they are used in
IT systems. In IT systems, the networks are isolated from ground, or connected to
ground through high impedance to decrease the leakage current.
N O T I C E
If the AC drives are used with other supplies, they do not comply with the EMC
requirements.
To change the EMC class of the VACON® NX AC drive from C2 or C3 to C4, see the
instructions in
6.6 Installation in an IT System
.
All products
No EMC
emission
protection
N
The AC drives of this category do not give EMC emission protection. These drives
are installed in enclosures.
N O T I C E
An external EMC filter is usually necessary to comply with the EMC emission re-
quirements.
In IP00
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