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3.7 Available EMC Classes
The product standard (EMC immunity requirements) IEC/EN 61800-3 + A1 has 5 categories. The VACON
®
AC drives are divided into 5
EMC classes that have equivalents in the standard. All VACON
®
NX AC drives comply with the standard IEC/EN 61800-3 + A1.
The type code tells which category requirement the AC drive complies with (see 3.4 Description of the Type Code ).
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.
NOTICE
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 envi-
ronment. 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 larg-
er, 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.
NOTICE
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 .
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