![ABB ACS550-01-04A1-4 [10/44] Chapter 2 definitions](/img/pdf.png)
ABB ACS550-01-04A1-4 [10/44] Chapter 2 definitions
![ABB ACS550-01-04A1-4 [10/44] Chapter 2 definitions](/views2/1556714/page10/bga.png)
10 EMC compliant installation and configuration for a PDS | Technical guide No. 3
Disturbance
level
Independent variable eg,frequency
Immunity level
Immunity limit
Emission limit
Emission level
Compatibility
margin
Chapter 2 - Definitions
Electromagnetic compatibility (EMC) of PDS
EMC stands for Electromagnetic compatibility. It is the ability
of electrical/electronic equipment to operate without problems
within an electromagnetic environment. Likewise, the equipment
must not disturb or interfere with any other product or system
within its locality. This is a legal requirement for all equipment
taken into service within the European Economic Area ( EEA).
The terms used to define compatibility are shown in figure 2-1.
Figure 2-1 Immunity and emission compatibility.
As variable speed drives are described as a source of interfer-
ence, it is natural that all parts which are in electrical or airborne
connection within the power drive system (PDS) are part of the
EMC compliance. The concept that a system is as weak as its
weakest point is valid here.
Immunity
Electrical equipment should be immune to high-frequency and
low-frequency phenomena. High-frequency phenomena include
electrostatic discharge (ESD), fast transient burst, radiated elec-
tromagnetic field, conducted radio frequency disturbance and
electrical surge. Typical low-frequency phenomena are mains
voltage harmonics, notches and imbalance.
Emission
The source of high-frequency emission from frequency converters
is the fast switching of power components such as IGBTs and
control electronics. This high-frequency emission can propagate
by conduction and radiation.
Содержание
- Emc compliant installation and configuration for a pds 3 3
- Technical guide no 3
- Technical guide no 3 emc compliant installation and configuration for a power drive system 3
- Contents 5
- Chapter 1 introduction 7
- Directives concerning the drive 7
- General 7
- Manufacturer s responsibility 7
- Purpose of this guide 7
- Who is the manufacturer 7
- Definitions 8
- Oem customer as a manufacturer 8
- Panel builder or system integrator as a manufacturer 8
- Practical installations and systems 8
- Earthing principles 9
- Product specific manuals 9
- Chapter 2 definitions 10
- Electromagnetic compatibility emc of pds 10
- Emission 10
- Immunity 10
- Power drive system 11
- Components or sub assemblies intended for incorporation into an apparatus by other manufacturers or assemblers 12
- Components or sub assemblies intended for incorporation into an apparatus by the end users 12
- Types of equipment 12
- Finished appliance 13
- Finished appliance intended for end users 13
- Finished appliance intended for other manufacturer or assembler 13
- Apparatus 14
- Ce marking for emc 14
- Equipment 14
- Fixed installation 14
- Systems combination of finished appliances 14
- Apparatus and systems must be ce marked 15
- Equipment 15
- First environment 15
- Fixed installations are required to satisfy various parts of the directives but are not required to be ce marked 15
- Installation environments 15
- Medium voltage network 15
- The first environment includes domestic premises it also in cludes establishments directly connected without intermediate transformer to a low voltage power supply network which sup plies buildings used for domestic purposes 15
- The pdss can be connected to either industrial or public power distribution networks the environment class depends on the way the pds is connected to power supply the environment classes are first and second environment according to the en61800 3 standard 15
- Emc emission limits 16
- Second environment 16
- Definitions 18
- Emc compliant installation and configuration for a pds 18
- Emc plan 18
- En 61800 3 emc product standard for pds 18
- Environment industrial network 18
- Environment public low voltage network 18
- Figure 2 5 emission limits for pds 18
- Technical guide no 3 18
- Chapter 3 emc solutions 19
- Conducted emission 19
- Emissions 19
- General 19
- Solutions for emc compatibility 19
- Radiated emission 20
- Clean and dirty side 21
- Rfi filtering 22
- Installation of the rfi filter 23
- Selecting the rfi filter 23
- Selection of a secondary enclosure 23
- Holes in enclosures 24
- Hf earthing 25
- Hf earthing with cable glands 25
- Hf earthing in power cable entries can be done by using a conductive sleeve around the cable shielding the sleeve is connected to the faraday cage by tightening it to the specially designed collar in the gland plate 26
- Hf earthing with conductive sleeve 26
- Earthing at motor end 27
- Conductive gaskets with control cables 28
- The shielding should be covered with conductive tape 28
- Installation of accessories 29
- Internal wiring 29
- Emc compliant installation and configuration for a pds 30
- Emc solutions 30
- Figure 3 11 principles of wiring inside cdm 30
- Technical guide no 3 30
- Use twisted pair wires wherever possible use shielded twisted pairs for signal level outward and return wires exiting from the overall enclosure avoid mixing pairs with different signal types eg 110 v ac 230 v ac 24 v dc analogue digital run wires along the metal surface and avoid wires hanging in free air which can become an antenna if plastic trunking is used secure it directly to installation plates or the framework do not allow spans over free air which could form an antenna keep power and control wiring separate use galvanically isolated potential free signals keep wires twisted as near the terminal as possible keep pigtails as short as possible earthing connections should be as short as possible in flat strip multi stranded or braided flexible conductors for low rfi impedance 30
- Control cables and cabling 31
- Power cables 32
- Transfer impedance 33
- Use of ferrite rings 33
- Chapter 4 practical examples 35
- In the case shown in figure 4 2 the cabinet is not required to be emc proof because connections are made directly in an emc compliant frequency converter 35
- Most simple installations of pds include three cables only sup ply cable motor cable and cable for brake resistor as shown in figure 4 1 35
- Shielded cables are shown interconnecting the primary parts ensuring attenuation of radiated emissions the supply is made through the rfi filter 35
- Simple installation 35
- The faraday cage is earthed and all the emissions are drained to earth 35
- Typical installation 35
- A suitable rfi filter at the supply input connections would require to be able to pass the dol starting current which can be six to seven times the normal full load current and would be greatly oversized for normal running which makes it difficult to design ferrite cores used in the feeds to the contactor will help attenu ate the coupled noise as shown in figure 4 3 36
- Emc compliant installation and configuration for a pds 36
- Example of by pass system 100 kva 36
- Figure 4 2 typical pds configuration 36
- Hf earthing 36
- In this case it is difficult to ensure that no cross coupling occurs between the dirty side of the converter and the clean side above the direct on line dol contactor contactors are not rfi barri ers and the coil circuits are also vulnerable 36
- Practical examples 36
- Shielded cable 36
- Technical guide no 3 36
- Emc compliant installation and configuration for a pds 37 37
- Experience has shown that in this case with short connections to the busbars the earth shield between the transformer windings is not quite adequate for conducted emissions attenuation for use in the first environment therefore an rfi filter may be needed at the primary side of the transformer for emc compliance an rfi filter is not normally needed for the second environment 37
- Figure 4 3 basic scheme with by pass 37
- In this case a 12 pulse rectifier is an it system unearthed due to the delta winding therefore any filter in the line must be at the primary side of the phase shift transformer 37
- Practical examples 37
- Technical guide no 37
- Typical example of 12 pulse drive 37
- Common earth 38
- Emc compliant installation and configuration for a pds 38
- Enclosure with segregation 38
- Figure 4 5 12 pulse converter system fed at lv cdm transformer and switch fuse have separate housing 38
- For equipment fed from an it system a similar procedure can be used an isolating transformer allows the pds to be earthed and to use a suitable filter for use in the first environment the point of coupling is at a medium voltage and emissions may be considered at the next low voltage point of coupling in the system the level of emissions should correspond to those for the appropriate environment for definitions see the installation environments section in chapter 2 38
- Note all equipment inside must be enclosed figure 4 4 12 pulse converter system fed at lv 38
- Practical examples 38
- Rfi filter 38
- Shielded control cables 38
- Technical guide no 3 38
- Example of emc plan 39
- Chapter 5 bibliography 41
- Chapter 6 index 42
- Contact us 44
- For more information contact your local abb representative or visit 44
- Www abb com drives www abb com drivespartners 44
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