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ACS550-01-04A1-4
Техническое руководство по конфигурации Страница: 2

ABB ACS550-01-04A1-4 Техническое руководство по конфигурации онлайн [2/44] 453747

2 EMC compliant installation and configuration for a PDS | Technical guide No. 3

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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

ABB ACS550-01-04A1-4 Техническое руководство по конфигурации онлайн [2/44] 453747

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