NB!
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 50 MHz (airborne) is especially generated by the control electronics.
2.9.2 Emission Requirements
According to the EMC product standard for adjustable speed frequency converters EN/IEC61800-3:2004 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 four categories together with the requirements for mains
supply voltage conducted emissions are given in the table below:
Category
Definition
Conducted emission requirement accord-
ing to the limits given in EN55011
C1 frequency converters installed in the first environment (home and office) with a supply voltage
less than 1000 V.
Class B
C2 frequency converters installed in the first environment (home and office) with a supply voltage
less than 1000 V, which are neither plug-in nor movable and are intended to be installed and
commissioned by a professional.
Class A Group 1
C3 frequency converters installed in the second environment (industrial) with a supply voltage
lower than 1000 V.
Class A Group 2
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 400 A or intended for use in complex systems.
No limit line.
An EMC plan should be made.
When the generic emission standards are used the frequency converters are required to comply with the following limits:
Environment
Generic standard
Conducted emission requirement accord-
ing to the limits given in EN55011
First environment
(home and office)
EN/IEC61000-6-3 Emission standard for residential, commercial and
light industrial environments.
Class B
Second environment
(industrial environment)
EN/IEC61000-6-4 Emission standard for industrial environments. Class A Group 1
2.9.3 EMC Test Results (Emission)
The following test results have been obtained using a system with a frequency converter (with options if relevant), a screened control cable, a control box
with potentiometer, as well as a motor and motor screened cable.
RFI filter type Conducted emission.
Maximum shielded cable length.
Radiated emission
Industrial environment Housing, trades and
light industries
Industrial environment Housing, trades and light in-
dustries
Standard EN 55011 Class A2 EN 55011 Class A1 EN 55011 Class B EN 55011 Class A1 EN 55011 Class B
A1/B1 RFI Filter installed
0.75-45 kW 200-240 V
150 m 150 m 50 m Yes No
0.75-90 kW 380-480 V 150 m 150 m 50 m Yes No
No A1/B1 RFI Filter installed
0.75-3.7 kW 200-240 V
5 m No No No No
5.5-45 kW 200-240 V 25 m No No No No
0.75-7.5 kW 380-480 V
5 m No No No No
11-90 kW 380-480 V
25 m No No No No
110-1000 kW 380-480 V
150 m No No No No
110-1200 kW 525-690 V
150 m No No No No
No A1/B1 RFI Filter installed
0.75-90 kW 525-600 V
- - - - -
Table 2.1: EMC Test Results (Emission)
AF-600 FP Design Guide
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