Eurotherm Drives 584S, Product Manual, Page: 118 / 176

Chapter 7 - The European Directives and the 'CE' Mark
7-4 584S Frequency Inverter
When using the generic EMC standards, the 'Residential, commercial and light industry' emission limits (Class B) are
more stringent than the 'Industrial' (class A) limits, and so equipment which meets EN50081-1(1992) automatically
meets EN50081-2(1994). Similarly, the 'Industrial' immunity requirements are more stringent than the 'Residential,
commercial and light industry' requirements, and equipment which meets prEN50082-2(1992) automatically meets
EN50082-1(1992).
More and more Product Specific standards are being released with less onerous EMC requirements than the Generic
Standards. When the new EMC Drive Product Standard for Power Drive System (EN61800-3) becomes available (Q
3/4 1996), EMC filters will only be
mandatory in ‘residential’ type EMC environments (if this is the most
appropriate standard to use for demonstrating conformance of the relevant apparatus). EMC competent bodies are
today using the draft EMC Drive Product Standard to demonstrate conformance using the technical construction file
route. The EMC Drive Product Standard as CEMEP is discussed in more detail in the Eurotherm Application manual
entitled ‘EMC Installation Guidelines for modules and systems’, part number HA388879, available from your local
Eurotherm Drives office.
It is important for the customer to identify what EMC standards are to be applied to the final machine/system and in
what EMC environment it will operate, so that any additional compliance costs can be minimised. It should be
remembered that when two or more EMC compliant components are combined to form the final machine/system, the
resulting machine/system may not be compliant. Emissions from combined components tend to be additive, whilst
the immunity remains constant.
FILTER SELECTION
584S/620 drive modules can be 'CE' marked (as in CEMEP validity field 1) when used with the specified specially
designed EMC filters to comply with the mains terminal limits of EN55011 Class B (or EN50081-1) as indicated
previously, and when installed in accordance with the
EMC installation instructions in this Product Manual
(chapter 3). The Class B limit is the most stringent limit applied in Europe to date, and allows product to be used in
either the 'residential, commercial and light industrial' or 'industrial' EMC environments. Refer to
Consideration of
EMC environments , in this chapter for more details. The specified EMC filters for the 584S/620 drive modules are
summarised in table 3-4 in Chapter 3. The fitment of the specified EMC filter is mandatory where 'CE' marking is
applied.
If the customer is treating the 584S/620 drive module as a component for supply to EMC competent professional
assemblers (CEMEP validity field 2)and is taking the EMC responsibility, then the filters are optional and may
assist the customer in achieving EMC compliance. In this situation the customer may also achieve compliance by less
expensive more global measures depending on the limits to be achieved, such as the use of a combination of global
or local filtering and screening methods, natural mitigation through distance or use of distributed parasitic elements
of the existing installation.
FILTER INSTALLATION
The required EMC emission and immunity performance, and 'CE' marking of 584S/620 drive modules can only be
achieved when the
EMC installation instructions in Chapter 3 are adhered to.
SPECIFICATION OF ACHIEVABLE EMC EMISSION AND IMMUNITY
584S/620 drive modules with the option to be 'CE' marked meet the following EMC emission limits provided they
are installed with the specified EMC filters for 'CE' marking in accordance with the EMC installation instructions.
Port Phenomenon Basic standard Level Generic standard
Enclosure Port radiated EN55011 (1991) Class B
(cubicle mount)
EN50081-1 (1992)
Class A
(wall mount)
EN50081-2 (1994)
AC Power Port conducted (with
specified filter)
EN55011 (1991) Class B # EN50081-1 (1992)
AC Power Port conducted (no filter no filter no filter no filter) EN55011 (1991) 130dB
!
V @ 150kHz* (common mode)
130dB
!
V @ 150kHz* (differential mode)
Reducing with frequency by 20dB/decade
* 6kHz switching frequency, 50 metres screened motor cable.
# Up to 50 metres screened motor cable maximum.
All 584S/620 drive modules meet the following EMC immunity performance criteria as defined in prEN50082-2
(1992) when installed and used as recommended.
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