Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual page 32

Introduction to VLT HVAC Ba...
When unscreened cables are used, some emission requirements are not complied with, although the immunity
requirements are observed.
In order to reduce the interference level from the entire system (unit + installation), make motor and brake cables as short
as possible. Avoid placing cables with a sensitive signal level alongside motor and brake cables. Radio interference higher
than 50MHz (airborne) is especially generated by the control electronics. Please see 5.1.5 EMC-Correct Electrical Installationfor
more information on EMC.
2.7.2 Emission Requirements
According to the EMC product standard for adjustable speed frequency converters EN/IEC 61800-3:2004 the EMC
requirements depend on the intended use of the frequency converter. Four categories are defined in the EMC product
standard. The definitions of the 4 categories together with the requirements for mains supply voltage conducted emissions
are given in Table 2.2.
Category Definition
C1 Frequency converters installed in the first environment (home and office) with a
supply voltage less than 1000V.
C2 Frequency converters installed in the first environment (home and office) with a
supply voltage less than 1000V, which are neither plug-in nor movable and are
intended to be installed and commissioned by a professional.
C3 Frequency converters installed in the second environment (industrial) with a supply
voltage lower than 1000V.
C4 Frequency converters installed in the second environment with a supply voltage
equal to or above 1000 V or rated current equal to or above 400A or intended for
use in complex systems.
Table 2.2 Emission Requirements
When the generic emission standards are used the frequency converters are required to comply with the following limits
Environment Generic standard
First environment EN/IEC 61000-6-3 Emission standard for residential, commercial
(home and office) and light industrial environments.
Second environment EN/IEC 61000-6-4 Emission standard for industrial environments.
(industrial environment)
VLT HVAC Basic Drive Design Guide
®
MG.18.C2.02 - VLT is a registered Danfoss trademark
Conducted emission requirement
according to the limits given in EN
55011
Class B
Class A Group 1
Class A Group 2
No limit line.
An EMC plan should be made.
Conducted emission requirement
according to the limits given in EN 55011
Class B
Class A Group 1
2 2
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