MULTIBARRIER MBD48-T415/Ex MBD49
Contents
1. Segment out PROFIBUS PA Trunk in Trunk out 120m Zone 0 el KP NND pem SA es 7 m c A H Fig 4 1 Example of a PROFIBUS PA fieldbus application D300794 0904 Planning a fieldbus application 4 2 2 Construction of a FOUNDATION fieldbus segment D300794 0904 Industr A With FOUNDATION fieldbus the segment is branched off from a High Speed Ethernet HSE segment via a so called bridge HSE H1 or from the control system via a power conditioner Fig 4 2 shows a fieldbus segment with an HSE H1 bridge 2 Kg ell B Wun a mm H MI 9 mme l HSE H1 Link D e D O D lo TUNCK TURCK TUNCK MBD49 T415 Ex MBD49 T415 Ex MBD49 T415 Ex C UIT 9 ore waa eee GH 9 A TD D papa ao GEB ED TDIDIDTD Trunk in Trunk out d Jy IH Qr Fig 4 2 Example of a FOUNDATION fieldbus application with an HSE H1 link In our example the FOUNDATION fieldbus network is directly branched off from the process control system via a FOUNDATION fieldbus segment card and enabled via a Linking Device by the fast High Speed Ethernet HSE stands for High Speed Ethernet which transfers the FOUNDATION fieldbus signals to Ethernet and provides significantly faster data2. T uPXERCZE Industrial Automation MULTIBARRIER MBD48 T415 Ex MBD49 T415 Ex ien H me USER MANUAL i cu i z Wc urs rm dom p ELI ch Lm F 94 01 D300793 0904 D300794 0904 Industr A Prior to installation Verify that there is no explosion hazardous atmosphere Disconnect the device from the power supply Protect against an accidental restart Verify safe isolation from the supply Observe mounting instructions Only appropriately qualified personnel according to EN 50110 1 2 VDC 0105 part 100 is permitted to work with the device system Verify static discharge prior to installation and touching the device The functional earth FE must be connected to the protective earth PE or the equipotential bond The installer is responsible for establishing this connection Safe electrical isolation of the low voltage for the 24 V supply must be ensured Use power supply units compliant with IEC 60 364 4 41 or HD 384 4 41 S2 VDE 0100 part 410 only Fluctuations or deviations of the mains supply from the rated value may not exceed the tolerance limits specified in the technical data Otherwise device malfunction or dangero
3. 51 D300794 0904 43 Planning a fieldbus application 4 Planning a fieldbus application 4 1 The fieldbus according to IEC 61158 FOUNDATION fieldbus and PROFIBUS PA are flexibly applicable fieldbuses for process automation The physical layer and data transfer of these bus systems are defined in IEC 61158 This standard fulfils important requirements of the chemical and petro chemical industries and has the title Digital data communication for measurement and control Fieldbus for use in industrial control systems It is divided into 6 parts These parts are designated with 61158 1 61158 2 etc and comprise the following issues Part 1 deals with introductory topics while parts 2 to 6 are oriented at the OSI layer model Table 4 1 and table 4 2 clearly indicate the contents of the standard and its context IEC 61158 Contents Document IEC 61158 1 Introductory guidelines IEC 61158 2 Specification of the bit transmission layer physical layer and definition of its services IEC 61158 3 Definition of the services of the safety layer Data link layer IEC 61158 4 Specification of the protocol of the safety layer Data link layer IEC 61158 5 Definition of the services of the 7 application layer application layer IEC 61158 6 Specification of the protocol of the 7 application layer application layer Tab 4 1 The structure of the IEC 61158 44 D300794 0904 Planning a fieldbus application Industr A D
4. 49 4 3 Assessing the number of required multibarriers 51 4 4 Termination of a fieldbus segment with a terminating resistor 51 5 Set up of the multibarrier AN 54 5 1 Mounting the multibarrier eese eee eere rne 54 DA ElOC Gal ENEE EE 54 9 3 Earning of tnie NOUSING odere ptr xu ena exor atc Pneus 54 5 4 Termination of a fieldbus segment 55 SES MEIN nre lerzii o a EE 55 o Glossary OF IBHTIS E 57 F ae Seid Te e T T LT I Um 63 6 D300794 0904 How to work with this manual Industr A How to work with this manual anigo e E lc 0 e 8 Meaning of the symbols used essen nnn nn 8 Correct usage to the intended pourpose 9 Configuration guidelines Product installation eeeseeeesseeeeess 9 D300794 0904 7 How to work with this manual Meaning of the symbols used Warning This sign is placed next to a warning indicating the presence of a hazard This can relate to personal injury as well as to system damage hardware and software The user should interpret this symbol as follows exercise extreme caution Attention A T his sign is placed next to a warning indicating a potential hazard This can relate to personal injury as well as to system hardware and software and equipment damage Note This sign is located next to general hints providing i
5. 16 F Field device eee 11 32 Fieldbus model 23 gs 0 p 11 21 23 Fixing torque eese 37 Flow transmitter 51 mi eo m HO 21 24 FOUNDATION fieldbus 24 32 44 Functional eaFll ciscenescccrsstaseceloaseseatnass 3 G Galvanic isolation 11 32 63 H EISE ETT uia diii senti rn Do E Cr etu 49 I IEG GENELE C ozarena 14 TEC 00529 EE 35 IEG 61158 2 kan ornnes 32 45 Ignition sources ss 19 Ignition temperature 16 Increased safety 16 19 Iniductariee e cid inis esi ER docete Eod 21 LSTA ATION vette eo ee ee 35 Installation work 3 Intrinsic safety 16 17 20 POG E darte eae 35 L Deen ESTE DIR ESTEE 55 Level controls oer bnnc 51 Biel EE 47 M MBD48 T415 EX 11 14 47 MBDA9 T415 Ex 11 14 Module rack 15 MOUN de Te Mee Rr ME 54 Measuring and control systems 26 P Physical aye uo oec idus iis 44 64 Si LE 23 Power conditioner 47 50 Potential transfer 11 32 Pressure transmitter 51 PROFIBUS DP liveries 23 PROFIBUS PA 24 32 44 PSLUSZ KE
6. eeeeeeeeeeeeeeneeenneee nennen 32 3 2 Marking and ident numbers cccccceseeeeeeeeeeeeeeeeeeeeeeeneeeeesaeeeesaneeeees 33 ee IOC MICA ko cic EMITIR TO 34 3 4 Transmission physics wesdesiceeecSesancdveccteharcoctaeeddanetetextapetidesttsueaddawuteundays 34 3 5 Area of application accordmgtoATES 34 3 6 Mechanical dumensions s nnennnennnennnennnrennnnrrnnnrrnnnnnnrnnrrnnrnnnrnnrennnne 35 3 7 Installation and disassembly ccceccceseeeeeeeeeeeeeeeeeeeeeeeeeeeeesaeeeeseneeeees 35 3 7 1 Mechanical installation 35 3 7 2 Electrical installation 36 3 8 Shielding and eartbung 39 3 9 Bus terminating resistor eeeeeeeeeeee eene nennen ener 39 3 10 Short circuit performance nennen nennen nnn 40 3 11 Potential ISOlatlOL iiossio osos seg geiee eet eu en sse a oun AREE ERRARE EEEE 41 3 11 Climatic Compensatton nennen nennen 41 3 13 Maintenance and repair 41 3 14 Errors and error elimination cccccccceeccseeeceeeeceesecseeeeeeeeseeeesseeeesaees 41 SEDD ee 42 D300794 0904 5 Table of Contents 4 Planning a fieldbus application ccccceecceeeeceeeeceeeeceeeesaeeesaeeesaeeeseessaeeees 44 4 1 The fieldbus according to IEC GiI1bn 44 4 2 Construction of a fieldbus segment n nsnnennennenrnenerrnnrnrrrnrnrrennnnrenne 47 4 2 1 Construction of a PROFIBUS PA segment 47 4 2 1 Construction of a FOUNDATION Fieldbus segment
7. shield if the shield is connected to a pole of the power supply unit Up to a line length of 5000 m there are no safety restrictions Line termination RC elements with R 90 100 Q C 0 2 2 uF Line termination is admissible at each end of the bus trunk line The terminating resistor must be interference immune according to EN50020 Tab 2 3 Valid parameter area of the FISCO model for applications according to EEX ib IIC IIB 22 D300794 0904 Basics of explosion protection D300794 0904 Industr A EEx ia IIC Power supply unit trapezoidal output curve Us 14 20 V max safety value Uo 2 2 x Us see chapter 2 I short circuit current according to PTB report W 39 e g up to 215 mA at Us 15 V group IIC Cable values per km R 15 150 Q loop resistance L 0 4 1 mH C 80 200 nF incl an existing shield C C conductor conductor 0 5 C conductor shield if the bus circuit is potential free or C C conductor conductor C conductor shield if the shield is connected to a pole of the power supply unit Up to a line length of 1000 m there are no safety restrictions Line termination RC elements with R 90 100 Q C 0 2 2 uF Line termination is admissible at each end of the bus trunk line The terminating resistor must be interference immune according to EN50020 Tab 2 4 Valid parameter area of the FISCO model for applications accordi
8. Case Ground Fig 3 2 Imprint on the top of the housing Type codes and ident numbers Multibarrier for PROFIBUS PA E MBD48 T415 Ex ident number 6611270 Multibarrier for FOUNDATION fieldbus E MBD49 T415 Ex ident number 6611247 D300794 0904 33 Instruction manual 3 3 Electrical data 16 32 VDC Operating voltage Us Max current consumption at a load of 40 mA per output Galvanic isolation to EN 50020 Trunk line EEX e to output EEx i Trunk line EEX e to supply voltage Between individual outputs Output voltage Output current Short circuit current limitation Ex approval according to EC type test examination certificate Max values No load voltage Uo Short circuit current lo Power Po Max safety voltage Im Internal inductances capacitances L C 280 mA at 16 VDC up to 138 mA at 32 VDC 253 VDC 253 VDC 60 VDC 2 10 5 V at 40 mA lt 40 mA 45 mA PTB 04 ATEX 2021 14 3 V 268 mA 958 mW 253 VAC negligible Tab 3 1 Electrical data 3 4 Transmission physics The multibarrier is suited for fieldbus system with transmission physics acc to IEC 61158 2 FOUNDATION fieldbus and PROFIBUS PA work in compliance with the specifications of the IEC fieldbus model The MBD T415 Ex is thus compatible with both fieldbus types The fieldbus model according to IEC 61158 2 is described in more detail in chapter 4 1 3 5 Area of application accor
9. In this case the shield may be connected various times to the earth in its course D300794 0904 25 Basics of explosion protection 26 Theinstallation itself reliably ensures potential equalisation between both ends of the cable In this case the cable shield may be mechanically connected to the earth at both ends of the cable as well as at intermediate positions if necesssary This procedure which is an excellent means of establishing a high level of EMC and personnel safety can be applied without any restrictions provided optimum potential equalisation is ensured The equipotential bond must extend over the entire length of the fieldbus in the explosion hazardous and the safe area e g to DIN 57165 chapter 5 3 3 Multiple earthing via low capacitances e g 1 nF 1500 V ceramics is effected The total capacitance however may not exceed the max value of 10 nF according to EN 60079 14 this is defined as a non conductive connection Fig 2 7 to 2 9 show various installation schematics for the protective conductor and the equipotential bonding connection in measuring and control systems Fig 2 7 shows a schematic which should be applied if the equipotential bond extends from the associated apparatus in the safe area to the node in the explosion hazardous area In Fig 2 8 the equipotential bond is only present in the explosion hazardous area D300794 0904 Basics of explosion protection Industr A
10. 50 Zap ieee ener eee ene rte 21 46 PTB report W 53 11 Projecting configuration 8 R FACOG LC MN UE 22 Rotational speed meter 51 RPC49 205 EE 50 S Screw terminals 36 Segment coupler 47 SIMCICIING ss detected eae 25 39 Short circuit protection 40 Spark test device 17 Station BE EE 27 T Temperature classes 16 Temperature transmitter 51 Terminating resistor 40 51 Test voltage acne eas 29 D300794 0904 Index of terms Transmitter ER IR ee EE 3 Trunk WG EE 1 32 36 V Verification of intrinsic safety 25 Z Zone classification 14 D300794 0904 Industr A 65 TURCK WORLD WIDE HEADQUARTERS GERMANY Hans Turck GmbH amp Co KG WitzlebenstraBe 7 45472 Mulheim an der Ruhr P O Box 45466 M lheim an der Ruhr Phone 49 208 4952 0 Fax 49 208 4952 2 64 E Mail turckmh mail turck globe de BELGIUM Multiprox N V P B 71 Lion d Orweg 12 9300 Aalst Phone 82 53 766566 Fax 32 53 783977 E Mail mail multiprox be BRAZIL TURCK Ltda Rua Apucarana 134 83324 040 Pinhais Phone 55 41 6682053 Fax 55 41 6681794 E Mail turck turck com br CZECH REPUBLIC TURCK s r o Hradeck 1151 500 03 Hradec Kr lo
11. L and capacitance Co are not indicated With these generally specified values it is assumed that L and C affect the intrinsically safe circuit in form of lumped inductances and capacitances which is not the case with the FISCO model for the bus line considered here The following regulations apply in addition Intrinsic Safety category ib or ia to EN 50020 Only a single active source in terms of intrinsic safety during data transfer of a node no power is supplied D300794 0904 21 Basics of explosion protection E n a steady state condition each node consumes a constant basic current direct current The nodes transmitter hand held bus master and repeater act as a passive current sink device The effective internal inductances and capacitances of the nodes are negligible in terms of intrinsic safety Various cable types are suitable Termination of both ends of the bus trunk line EEx ib IIC IIB Power supply unit approx rectangular output curve Us 14 24 V max safety value I short circuit current according to PTB report W 39 e g up to 128 mA at Us 15 V group IIC up to 280 mA at Us 15 V group IIB Cable values per km R 15 150 Q loop resistance L 0 4 1 mH C 80 200 nF incl an existing shield C C conductor conductor 0 5 C conductor shield if the bus circuit is potential free or C C conductor conductor C conductor
12. for the various legal regulations of the EU member states covering devices and protective systems intended for use in explosion hazardous areas it is also called the ATEX Directive Explosion protection type Increased Safety EEx e The explosion protection type Increased Safety Fig 2 4 was developed in Germany with the aim to prevent the development of ignition sources sparks hot surface arcs sources of radiation by applying an increased level of safety D300794 0904 Basics of explosion protection Industr A DE Fig 2 4 Function schematic protection type Increased Safety EEx e With electrical equipment of this protection type particular importance is attached to the following factors a safe construction according to EN 50014 a re inforced operational and basic insulation terminals protected against accidental loosening sufficient mechanical protection a safe connection of the incoming lines The multibarrier features safe mechanical protection due to its EEx e base housing and EEx e cable glands the incoming lines are safely connected via EEx e terminals D300794 0904 19 Basics of explosion protection 2 4 Intrinsic safety and fieldbus systems Fieldbus systems are gaining more and more acceptance also in the explosion hazardous area as a cost effective solution for automation technology When employing such systems the according explosion protection guidelines must be observed and explosi
13. in this brochure Please refer to the explosion protection regulations of the professional association of the chemical industry Ex RL and the EN 1127 1 Explosion protection secondary The secondary method of explosion protection comprises measures which prevent ignition of a dangerous atmosphere Here constructive or electrical techniques are used to segregate the electrical equipment which could ignite a dangerous mixture by keeping the explosive atmosphere away from the ignition source prevent an explosion by impeding the propagation to the surrounding explosive atmosphere F FISCO Fieldbus Intrinsically Safe Concept In the FISCO model typically only a single active device i e the bus power supply is conected to the fieldbus All other devices do not supply any energy via the line and are thus specified as passive D300794 0904 59 Glossary of terms 60 FNICO Fieldbus Non Incendive Concept With FNICO zone 2 installations are just as easily accomplished as zone 1 installations according to the FISCO standard A main difference compared to the FISCO standard is the higher power that may be lead into the field Intrinsic safety EEx i explosion protection type i EN 50020 All other protection types except intrinsic safety attempt to contain the explosion to the inside of the housing and to prevent penetration of an ignitable gaseous mixture The method of intrinsic safety is based on a diffe
14. number of connectable nodes is achieved by an EEx e rated fieldbus supply which can be fed through from multibarrier to multibarrier see Fig 3 1 The outputs of the multibarrier are intrinsically safe trunk line EEx e IEC 61158 2 MBD49 T415 Ex MBD49 T41 BW CSES WE soos BN S225 Ex zone 1 zone 0 EEx ia outputs to the field devices Fig 3 1 Increasing the number of field devices Due to the galvanic isolation between the trunk line and the outputs and between the individual outputs compensating currents and potential transfer are prevented A Attention Multibarriers operated in the safe area may subsequently not be used in explosion hazardous areas D300794 0904 Instruction manual Industr A Attention The multibarriers are exclusively approved for the applications listed in this document Should this regulation be violated the manufacturer is exempt from his liability and responsibility 3 2 Marking and ident numbers The following indications are printed on the top of the multibarrier housing mom p lt oe D 45466 Mulheim an der Ruhr PTB 04 ATEX 2021 BH top M grec e Il 2 1G D G EEx m e ia IIC T4 Tu 20 70 C Nicht eigensichere Stromkreise durch IP30 Abdeckung geschiitzt Non intrinsically safe circuits are protected by an IP30 cover Des circuits de courant non a s curit intrins que sont prot g s par un couvercle IP30 Segment Segment Drop Drop Drop Drop IN OUT S1 S2 S3 S4
15. of fieldbus nodes and their current consumption The number is calculated as follows 50 D300794 0904 Planning a fieldbus application Industr A Add up the number of fieldbus nodes Divide the result by 4 Round up the result to the next whole number This result indicates the minimum number of multibarriers needed Example 4 temperature transmitters 3 pressure transmitters 2 flow transmitters 2 level controls 4 rotational speed meters This results in 4 3 2 2 4 4 3 75 Therefore the minimum number of multibarriers is 4 A configuration tool for planning a segment e g with a selection guide for cable types etc can be downloaded from the TURCK homepage www turck com free of charge 4 4 Termination of a fieldbus segment with a terminating resistor To ensure correct communication the bus line must be terminated at both ends with a terminating resistor in order to avoid reflections on the cable and thus to optimise the transmission quality The bus terminator is usually integrated in the segment coupler link or power conditioner und must thus only be added to the other end of the bus line If the multibarrier is physically the last device connected to the segment then the internal terminating resistor must be activated The terminating resistors are located on the printed circuit board of the multibarrier see chapter 3 9 A model bus termination is shown in fig 4 4 D300794 0904 51
16. process automation occur there where an explosive atmosphere of flammable gases vapours and mists prevails In the chemical petro chemical and pharmaceutical industries these substances occur in various concentrations Gas filling systems oil pipe lines or installations for the storage of flammable liquids are only a few examples of installations requiring permanent monitoring In the explosion hazardous area the manufacturer of machines and systems and his suppliers are required to assume a high level of responsibility A single spark may suffice to trigger an explosion which can cause significant harm to man machine and the environment Zone classification and device categories In Europe explosion hazardous areas are divided into zones according to their danger potential According to the Directive 94 9 EC ATEX 100a the areas of usage of the electrical equipment in the various zones are divided into categories according to their intended purpose The category indicates in which zone the respective electrical apparatus may be used The following table table 2 1 lists the zones according to IEC CENELEC for gases vapours and dusts D300794 0904 Basics of explosion protection Industr A Equipment categories vapours Areas in which dangerous concentrations of flammable gases vapours are present continuously or over longer periods Zone 1 Areas in which dangerous concentrations of flammable gases vapours are pr
17. 0 Fax 48 77 4434801 E Mail turck turck pl ROMANIA TURCK Automation Romania SRL Str luliu Tetrat nr 18 Sector 1 011914 Bukarest Phone 40 21 2 30 02 79 2 30 05 94 Fax 40 21 2 31 40 87 E Mail infoQturck ro RUSSIA TURCK Avtomatizazija O O O Volokolamskoe Shosse 1 office 606 a 125080 Moskau Phone 7 095 1 05 00 54 Fax 7 095 1 58 95 72 E Mail turck turck ru USA TURCK Inc 3000 Campus Drive Minneapolis MN 55441 2656 Phone 1 763 553 9224 553 7300 Fax 1 763 553 0708 E Mail mailbag turck com and more than 60 representatives and agencies world wide Industr A
18. 3 and thus to the FISCO model If there is a short circuit at one of the fieldbus nodes only the affected output is turned off while the trunk line of the fieldbus segment and the other outputs remain operational This manual will help you plan your fieldbus application It provides detailed technical information on the multibarrier as well as important details on the topic of explosion protection 11 Introduction 12 D300794 0904 Basics of explosion protection Industr A 2 Basics of explosion protection 2 1 Zone classification and device categories 2 1 1 Temperature CIaSSOS cete tke ea on cieb En y REI eap EEE Pes E Bu EM uu ES MUNI EET RENE 16 2 2 Protection type Intrinsic Safety EEN 17 2 3 Protection type Increased Safety EEX el 19 2 4 Intrinsic safety and fieldbus systemS n nsnnesnneneenennernrnreerrnnrnnrnnre renren 20 20 Wile FSCO WICC RR 21 2 6 The FNICO Model tee 24 Sech Tne massi m 24 2 8 Shielding and earthing MEE ETT 25 2 9 Installation of cables and conductors 28 2 9 1 Cables and conductors in intrinsically safe circuits 29 2 10 Selection of admissible cable tvpes 30 D300794 0904 13 Basics of explosion protection 2 2 1 14 Basics of explosion protection The multibarriers MBD48 T415 Ex and MBD49 T415 Ex are electrical equipment suited both for explosion hazardous and safe areas Explosion hazardous areas in
19. 5 3 7 Installation and disassembly esses nennen 35 3 7 1 Mechanical installation eese 35 S lae edel LL e RANN 36 3 8 Shielding and earthing 1211ceeceeee creer ee cene e er nnne nenne nn annuae na 39 3 9 Bus terminating resisto EE 39 3 10 Short circuit performance eene nnn nnne nnns 40 9 11 erai m T 41 3 11 Climatic compensation EE 41 3 13 Maintenance and repair 4 eicere eene anas enhn narum NEESS SEKR NN ee 41 3 14 Errors and error elmmmmaton cee ee cece eee eee ee eee ee eesae essa eesaeeesaeeeas 41 2 to WISI Sa M 42 D300794 0904 31 Instruction manual 3 3 1 32 Operating manual for multibarriers Usage and functions The multibarrier enables connection of an increased number of field devices to a fieldbus compliant with transmission physics according to IEC 61158 2 either in the explosion hazardous or the safe area The specific transmission technology applies both to FOUNDATION fieldbus and to PROFIBUS PA Depending on the type of fieldbus model see chapter 3 4 to 3 6 only a limited number of field devices per segment can be operated via an intrinsically safe fieldbus in practice quite often not more than 10 field devices When using the multibarrier this limited number can be increased to 32 field devices The increased
20. EC publication 79 3 It is connected to that point in the circuit at which an error is to be simulated To assess the level of protection of the entire device one distinguishes two categories Category ia und Category ib Category ia The circuits may not lead to an ignition if the max voltage is applied during normal operation and in the event of two errors in addition to the non countable errors see Fig 2 2 e AAA Fig 2 2 Error possibilities in category ia D300794 0904 17 Basics of explosion protection 2 3 18 Countable errors are errors which can occur at the components of the electrical equipment complying with construction standard EN50020 Non countable errors are errors which can occur at the components of the electrical equipment non compliant with EN 50020 Category ib The circuits may not lead to an ignition if the max voltage is applied during normal operation and in the event of a single error in addition to the non countable errors see Fig 2 3 EM Fig 2 3 Error possibilities in category ib The four outputs of the multibarrier for the field devices feature protection type EEx ia Devices compliant with protection type EEx ia are suited for use in Zone O while devices with protection type EEx ib are approved for use in Zone 1 Explosion protection type Intrinsic Safety is described in standard EN50020 of the Directive 94 9 EC The Directive 94 9 EC is a harmonising directive
21. Planning a fieldbus application terminating resistor activated fieldbus FOUNDATION fieldbus PROFIBUS PA trunk in trunk out EE c m e max 32 field devices funt Fig 4 4 Model bus termination valid for FOUNDATION fieldbus and PROFIBUS PA 52 D300794 0904 Set up of the multibarrier Industr A 5 Set up of the multibarrier 5 1 Mounting the TUN ATION usos nunc peru muscae eegene eech Eelere e den E 54 5 9 Eanhing Ol the MOUSING E 54 5 4 Termination of the fieldbus segmemt 55 SES LED WEE 55 D300794 0904 53 Set up of the multibarrier 5 Set up of the multibarrier 5 1 Mounting of the multibarrier The multibarrier should be mounted according to the installation guidelines provided in chapter 3 7 5 2 Electrical installation The electric connection of the multibarrier must be carried out according to the installation guidelines provided in chapter 3 8 5 3 Earthing of the housing Attention The equipotential bond is established via an M5 x 1 earthing bolt attached to the housing Potential equalisation must accord to EN 60079 14 specifications It is not permitted to establish the equipotential bond via the shielding conductor i Note Please observe the details provided in chapters 3 7 and 3 8 54 D300794 0904 Set up of the multibarrier Industr A 5 4 Termination of a fieldbus segment If the multibarrier is physically the last devi
22. ace temperature of an apparatus Here the explosion protected apparatus can be approved for different temperature classes a decision which depends on technical and financial considerations Thus the lowest possible temperature classification in dependence on the type of protection is usually related with challenging techniques and accordingly high expenses Intrinsically safe products are in comparison more efficient and cheaper Temperature classification is only required for intrinsically safe equipment which is directly installed in explosion hazardous areas For associated apparatus this classification is not needed TUV Technischer Uberwachungsverein v Verification of intrinsic safety According to EN60079 14 it is required to document and confirm that intrinsic safety is maintained when interconnecting intrinsically safe apparatus and associated equipment Z Zone 0 Zone 0 comprises locations in which a dangerous explosive atmosphere is present continuously or frequently Likelyhood of the occurrence of an ignitable mixture constantly for long periods or frequently guide value gt 1000 h a Zone 1 Zone 1 are locations in which an explosive or dangerous explosive atmosphere is likely to occur Likelyhood of the occurrence of an ignitable mixture occasionally during normal operation guide value 10 1000 h a Zone 2 Zone 2 are locations in which an explosive or dangerous explosive atmosphere is likely to occur
23. azardous and safe areas The multibarrier is designed to increase the number of bus devices to provide more flexibility to enhance operational safety and to reduce power supply and cabling expenses If the multibarrier is connected to an H1 fieldbus segment it can be used to power at least 4 fieldbus devices As the barriers can be cascaded via additional terminals up to 32 field devices can be operated via a single segment coupler power conditioner in the explosion hazardous area The multibarrier does not require an extra power supply for this purpose since it is powered via the fieldbus cable According to the Directive 94 9 EC ATEX 100a the multibarrier may be mounted in Zone 1 Il 2 G Within Zone 1 the device is connected via connections featuring protection type Increased Safety EEx e to the trunk line main line of a fieldbus according to IEC 61158 2 Another characteristic is the selectable internal fieldbus terminating resistor switch in The terminating resistor should be activated if the multibarrier is physically the last device connected to the trunk line In order to avoid potential transfer and unwanted potential compensating currents the MBD features galvanic isolation between the trunk line and the outputs and between individual the outputs Per output there are 40 mA available for the supply of the fieldbus devices The outputs are short circuit protected and accord to the requirements of PTB report W 5
24. bus nodes must be higher than or identical to the according values of the fieldbus barrier The capacitances and inductances of the nodes and the cables must be identical to or lower than the values of the fieldbus barrier In table 2 6 these requirements are summarised Intrinsically safe fieldbus Ope Associated apparatus node rator multibarrier Umax Uo Leable XL Lo Ccapte XC Co Tab 2 6 Comparison of the Entity parameters 2 8 Shielding and earthing To ensure optimum electro magnetic capability of systems it is of great importance that all system components in particular the cables connecting the components are shielded If possible these shields must form an electrical sheath without any interruption In terms of fieldbuses this means that in an ideal case the cable shields are connected to the mainly metal housings or according protective enclosures of the connected field devices Earthing the metal housing with the equipotential bonding system must only be effected at one end of the fieldbus system Preferably this should be done at the end in the non explosion hazardous area Thus the flow of ignitable compensating currents due to different potentials between the two ends of the shield is to be avoided In the following cases it is admissible to deviate from this rule If the line shield has a high resistance or it is required to implement shielding against inductive interference
25. ce connected to the fieldbus then the internal terminating resistor must be activated Note Further information is provided in chapters 3 9 and 4 4 5 5 LED indications The multibarrier is equipped with 4 LEDs inside the housing on the printed circuit board The channel related LEDs 1 4 will illuminate red in the event of a short circuit of the associated output i Note S ee also chapter 3 10 D300794 0904 55 Set up of the multibarrier 56 D300794 0904 Glossary of terms Industr A 6 Glossary of terms A Applied Directives Directive 94 9 EC The directive 94 9 EC better known under the name ATEX ATEX 100a regulates the manufacture and placing on the market of electrical equipment and protective systems for use in explosion hazardous areas The safety technical aspects are based on the Basic safety and health requirements for the conception and construction of devices and protective systems intended for use in explosion hazardous areas acc to Annex Il The directives prescribes an EC type test examination certificate for electrical devices category 1 and 2 together with the according test certificate Ex certificate Devices of category 3 must have a manufacturer s declaration EC conformity declaration stating compliance with the directive and if necessary under application of specific standards DIN EN 60079 14 Electrical equipment for explosion hazardous areas part 14 Electrical sys
26. communication for the higher cell levels In the following figure Fig 4 3 the segment is branched off directly from the control system via the power conditioner RPC49 205 49 Planning a fieldbus application PG Host System 1 m E 1h ER di 0000 Segment in e g RPC49 205 Power Supply 3 PSU 3214 Bo o OOOO 265 9 Segment out 6 D 6 D 6 D TrusERCH TURCK TURCK MBD49 T415 Ex MBD49 T415 Ex MBD49 T415 Ex o o Oj o Oj E Ex UD D H aon CBE ES Trunk in Trunk out et Fig 4 3 Example of a FOUNDATION fieldbus application with a power conditioner In our example the FOUNDATION fieldbus network is branched off directly from the process control system via a FOUNDATION fieldbus segment card and powered via a power conditioner with integral power supply Then the multibarrier is directly connected to the H1 bus Depending on the number of nodes it is possible to interconnect several multibarriers Alongside the devices shown i e the PSU3214 and RPC49 205 TURCK provides all components needed to construct a FF network i e for installation of the physical layer 4 3 Assessing the number of multibarriers needed The number of multibarriers needed depends on the number
27. ding to ATEX The area of application according to ATEX is Il2 1GD G EExme ia IIC T4 34 D300794 0904 Instruction manual Industr A 3 6 Mechanical dimensions Fig 3 8 Mechanical dimensions of MBD49 T415 Ex identical to MBD48 T415 Ex 3 7 Installation and disassembly The installation resp the disassembly of the multibarrier may only be carried out by specially trained and qualified staff During installation the applicable technical regulations and installer regulations must be observed 3 7 1 Electrical installation The multibarrier housing is suited for wall mounting and features protection degree IP66 acc to IEC EN 60529 For mounting use 4 screws with a diameter of approx 5 6 mm see Fig 3 4 For mounting the housing cover must be removed 4 Screws 5 6 mm Fig 3 4 Mounting of the fixing screws D300794 0904 35 Instruction manual Attention Always take care that the housing is mounted correctly and safely during installation The cable glands should be protected against the impact of mechanical hazards 3 7 2 Electrical installation A Warning T he electrical connection may not be established if voltage applies The trunk line is connected via screw terminals the outputs via cage clamp terminals To connect the trunk line first the housing cover and then the IP30 cover must be removed The connections of the intrinsically safe outputs can be freely access
28. e errors between intrinsically safe and non safe circuits e g because there are blue neutral conductors then the intrinsically safe cabling should be bundled routed in a separate conduit or be clearly arranged and separated so that interchange errors are excluded D300794 0904 29 Basics of explosion protection 2 10 Selection of admissible cable types 30 Cables and conductors should be selected to resist the mechanical chemical and thermal strain which is expected to occur at the operating location It must thus first be clarified which type of strain will occur mainly at the operating location in order to then select the individual cable types according the following standards DIN VDE 0298 part 1 DIN VDE 0298 part 3 DIN VDE 0891 part 1 DIN VDE 0891 part 6 These standards contain individual regulations for cables and conductors concerning the construction type the area of use the installation conditions mounting etc Fieldbus cables type FB from TURCK are suited for use in explosion hazardous areas D300794 0904 Instruction manual Industr A 3 Operating manual for multibarriers 3 1 Application and TUNCHON E 3 2 Marking and ident numbers AAA 33 Podzi eigrezikoiMe errr P 34 34 Transmission DEIER geess ecce ser euh Scheed kee Er Rap deeg REC UMEN 34 3 5 Area of application according to ATEX cccccceeceeseceeeeseeeeeeeeeeesaeeseeeneeens 34 Rn er Ee len 3
29. ed after opening the top cover The cables must be fully inserted into the cable glands Fig 3 5 shows the position of the cable glands and the electrical connections Trunk line in and out Fig 3 5 Position of the cable glands and the electrical connections 36 D300794 0904 Instruction manual Industr A Cable diameters and conductor cross sections Trunk line Cable diameter 10 14 mm Conductor cross lt 2 5 mm with flexible conductors section lt 4 mm with rigid conductors Outputs Cable diameter Conductor cross section Tab 3 2 Admissible cable diameters and conductor cross sections Attention The fixing torque of the screw terminals may not be exceeded The cable glands may be used for permanent cabling only For the trunk line EEx e bus in and bus out EEx e type cable glands are used To connect the conductors the cable jacket should be stripped by 10 15 cm The electrical pin configuration accords to the following tables i e table 3 3 and table 3 4 D300794 0904 37 Instruction manual 38 Shield connection of EEx e cable Shield connection of EEx e cable EEx e cable trunk line EEx e cable trunk line EEx e cable trunk line Tab 3 3 Connection of EEx e terminals EEx i cable output Shield connection of EEx i cable Tab 3 4 Connection of EEx i terminals Tab 3 5 Connection o
30. esent occasionally Zone 2 3G 2G 1G Areas in which dangerous concentrations of flammable gases vapours are rarely present and if then only for a short time Zone 20 1D Areas in which dangerous concentrations of flammable dusts are present continuously or over longer periods Zone 21 2D 1D Areas in which dangerous concentrations of flammable dusts are present occasionally Zone 22 3D 2D 1D Areas in which dangerous concentrations of flammable dusts are rarely present and if then only for a short time Tab 2 1 Zone classification acc to IEC CENELEC for gases vapours and dusts In order to prevent explosions various different types of protection are applied to protect machines systems and devices D300794 0904 15 Basics of explosion protection The TURCK multibarrier features protection types intrinsic safety increased safety and encapsulation The specific connection techniques associated with protection types Intrinsic Safety EEx i and Increased Safety EEx e are described in detail on the next pages 2 1 1 Temperature classes The ignition temperature of a combustible gas is defined as the lowest temperature of a hot surface at which the gas air or vapour air mixture can ignite The highest surface temperature of electrical equipment must thus always be lower than the ignition temperature of the surrounding atmosphere Temperature classes T1 to T6 are relevant for electrical equipment according to explosion
31. esignation Function of the layer of the layer Application Interface to the user program with layer application related commands read write Presentation Presentation coding of the data for layer processing and interpretation in the next layer Session layer Connection and disconnection of temporary node connections synchronisation of communicative processes Transport layer Control of data transfer for layer 5 transport errors division into data packets Network layer Connection and disconnection of connections prevention of network traffic jams Data link layer Description of the bus access method Medium Access Control MAC including data back up Bit transmission Definition of the medium hardware layer coding the speed of data physical layer transmission etc Tab 4 2 The OSI layer model The IEC 61158 2 relates to the OSI layer 1 physical layer and defines the transmission medium data coding and data transmission speed For operation of a FOUNDATION fieldbus or PROFIBUS PA network it is required that all components used comply with this standard For use in the explosion hazardous area it is additionally required that the components are approved and certified by an authorised body such as the PTB in Germany or the UL in the USA D300794 0904 45 Planning a fieldbus application The multibarrier MBD T415 Ex operates in compliance with the specifications of the IEC 61158 2 Table 4 3 show
32. f the outputs D300794 0904 Instruction manual Industr A 3 8 Shielding and earthing Shielding The cable shields of the EEx e trunk line are connected via screw terminals whereas the shields of the EEx i cables are connected via cage clamp terminals see table 3 3 and table 3 4 The cable shields are connected capacitively with the functional earth of the housing The capacity is specified with 1 nF Note In order to provide optimum EMC protection we recommend the use of EMC grade cable glands for multibarrier operation Earthing A Attention P lease ensure sufficient equipotential bonding of the installation The device must be connected to the equipotential bond via the M5 X 1 bolt on the bottom of the housing Potential equalisation must accord to EN 60079 14 specifications It is not permitted to establish the equipotential bond via the shielding conductor 3 9 Selectable terminating resistor The multibarrier is equipped with a switch in bus terminating resistor acc to IEC 61158 2 The terminating resistor also called terminator prevents reflections at the end of the bus segment The bus terminating resistor is described in more detail in chapter 4 4 Fig 3 7 shows the position of the switch D300794 0904 39 Instruction manual switch in terminatina resistor Fig 3 7 Position of switch to enable disable the terminating resistor 3 10 Short circuit performance The multibarrier outputs feature c
33. fully retained 3 13 Maintenance The multibarrier does not require maintenance configuration or special settings 3 14 Errors and error handling A Warning Trouble shooting and error elimination may only be carried out by specially trained qualified staff Devices which have once been used in the non explosion hazardous area may not be used subsequently in the explosion hazardous area If a malfunction of the multibarrier occurs due to inappropriate handling or other reasons then the device must be replaced Defect device components may only be replaced with genuine TURCK spare parts D300794 0904 41 Instruction manual 3 15 Disposal Disposal of the multibarrier and its packaging must comply with the regulations of the respective country in which the device is used The multibarrier contains electronic components such as semi conductors and must possibly be treated as hazardous waste 42 D300794 0904 Planning a fieldbus application Industr A 4 Planning a fieldbus application 4 1 The fieldbus according to IEC 61158 seeeeseeeeeeeee 4 2 Construction of a fieldbus segment 47 4 2 1 Construction of a PROFIBUS PA segment en 47 4 2 2 Construction of a FOUNDATION fieldbus segment 49 4 3 Assessing the number of required multibarriers 51 4 4 Termination of a fieldbus segment with a terminating resistor
34. group Il Electrical equipment is assigned to a temperature class according to its maximum surface temperature Equipment which accords to a higher temperature class can of course be used for lower temperature class applications The temperature class of the TURCK multibarrier is T4 Ignition tempe rature in C Max surface tempe rature in C Example Propane Methane Ammo niac Tab 2 2 Temperature classes of explosion group ll 2 2 Protection type Intrinsic Safety EEx i Protection type Intrinsic Safety limits the electrical energy in an electric circuit needed to ignite an explosive atmosphere during 16 D300794 0904 Basics of explosion protection Industr A normal and faulty operation This is achieved by integrating current and voltage limiting components in these circuits see Fig 2 1 I Me Fig 2 1 Function schematic protection type Intrinsic safety EEx i In contrast to other methods of explosion protection protection type Intrinsic Safety permits opening and operating the device for instance during maintenance even in explosion hazardous areas i e the intrinsically safe circuits according to category ia can be operated in zone O Intrinsic safety is verified and approved by certified bodies such as the PTB or the T V Whether a circuit is intrinsically safe is tested by a spark test apparatus which was introduced as an international standard test device according to I
35. hannel specific short circuit protection The max current is limited to 40 mA This prevents a short circuit from affecting the trunk line and other drop lines The fieldbus remains operational i Note In order to check the LED indications in the event of a short circuit the housing cover of the multibarrier must be removed The short circuit is indicated separately for each channel via a red LED inside the housing see Fig 3 8 The LEDs are marked with Fault LEDs for short circuit indication Fig 3 8 Position of LED indicators 40 D300794 0904 Instruction manual Industr A 3 11 Potential isolation The multibarrier features galvanic isolation between the EEx i outputs and the EEx e trunk line and between the individual EEx i outputs This has the advantage that potential transfer and compensating currents between outputs cannot occur Overvoltages are isolated 3 12 Climatic withstand capability In regions subject to high temperature fluctuations and variable humidity it can happen that condensation water builds up inside the device In order to prevent condensation water build up the MBD T415 Ex is equipped with a pressure compensation element breather on the cable connection side The pressure compensation element ensures continuous and reliable ventilation of the multibarrier The ePTFE membrane inside the breather features a high water entry pressure and is oil resistant Salt crystals are also
36. mportant information on individual or stepwise work procedures These hints may facilitate work and possibly help to avoid excess work resulting from faulty proceedings 8 D300794 0904 How to work with this manual Industr A Attention It is indispensable to read this section because the safety in dealing with electrical equipment should not be left to chance This manual contains all information pertaining to safe and proper operation of the TURCK products It specifically addresses trained and qualified staff disposing of the appropriate technical knowledge Correct usage to the intended purpose Warning The devices described in this manual may only be used in such applications described in the technical sections of the manual and only in conjunction with certified external devices and components Correct and safe operation of the devices relies on appropriate transport and storage correct installation and set up as well as careful operation and maintenance Configuration guidelines Product installation A Warning It is indispensable to observe the applicable safety and accident prevention regulations of the specific application D300794 0904 9 How to work with this manual 10 D300794 0904 Introduction Industr A 1 Introduction D300794 0904 The multibarriers MBD48 T415 Ex and MBD49 T415 Ex in the following also referred to as MBD from TURCK are 4 channel fieldbus junctions for explosion h
37. ng to EEX ia IIC These specifications result in the follwing basic construction of a fieldbus model as shown in Fig 2 5 The power supply unit for the bus and the bus master for connection to the field devices are usually located in the control room non explosion hazardous area The power supply unit integrates means for secure limitation of the power and voltage on the bus The technical requirements resulting from the FISCO model cannot be fulfilled by PROFIBUS DP as described in EN 50170 In contrast to PROFIBUS DP via which data are transferred via the UART protocol according to EIA standard RS485 PROFIBUS PA and FOUNDATION fieldbus use the bit synchronous line protocol and DC free signal transmission according to the standard IEC 61158 2 voltage mode wire medium 31 25 kbps also called H1 Bus 23 Basics of explosion protection 2 6 2 7 24 This standard fulfils the specific requirements of the chemical and petro chemical industries and is compatible with the FISCO model described above The FNICO model FNICO stands for Fieldbus Non Incendive Concept This concept is the further development of the FISCO model for zone 2 installations With FNICO zone 2 installations are just as easily accomplished as zone 1 installations according to the FISCO standard A main difference compared to the FISCO standard is the higher power that may be lead into the field Fieldbus devices to FNICO usually have an Ex n
38. on protection measures must be taken see Fig 2 5 PC control room Z E signal coupler and EEx i power supply go terminating resistor field Fig 2 5 Fieldbus model The following requirements generally apply to intrinsically safe fieldbus systems according to a PTB report Johannsmeyer Protection type Intrinsic Safety EEx ia or EEx ib according to EN 50020 CENELEC or IEC 79 11 Class 1 Division 1 according to US standard must be fulfilled There is only a single active source in the system voltage supply The fieldbus nodes act as passive current sink devices with a current consumption of min 10 mA AII fieldbus nodes have negligible internal inductances and capacitances The cables used accord to the fieldbus standard The bus is terminated at both ends applying the following values R 90 100 Q C lt 2 2 uF 20 D300794 0904 Basics of explosion protection Industr A Protection type Intrinsic Safety EEx i has the advantage that bus nodes can be connected and disconnected during operation without igniting an explosive atmosphere If a fieldbus system is planned and installed in the explosion hazardous area it is required to provide a means of Verification of Intrinsic Safety according to
39. only rarely and if only for a short time Likelyhood of the occurrence of an ignitable mixture unlikely or rarely and then only for a short time guide value lt 10 h a D300794 0904 61 Glossary of terms 62 D3007940904 Index of terms Alpha numerical 94 9 EC ATEX 1004 14 A nup c te 34 Atmosphere A 3 B SE 41 C Glo MODUS 28 30 Cable diameter 37 Cage clamp terminals 36 Capac iz Igrof 2 Go 21 Category ia eese eee 17 Category ib s 17 18 ene Uer 30 Conductor cross section 37 Conductor insulation 29 Control room enne 23 47 Compensating currents 25 Correct usage to the intended purpose8 D Device categories 14 DIN VDE 0298 30 D300794 0904 Industr A E Earthing dme 20 EE d m c 20 Electrical equipment apparatus 16 Electromagnetic capability EMC 25 EN 60079 14 esee 39 SEXIES Nc 24 Encapsulation s ssssesnennenenrrennee nnne 16 ENGT 17 24 Sud e 24 Equipotential bonding 25 26 54 treie 17 18 21 Explosive atmosphere 14 Explosion protection 11 Explosion protection types
40. ons Explosive atmosphere dangerous A dangerous explosive atmosphere is a mixture containing concentrations of flammable gases or vapours that when ignited can cause damage to persons directly or indirectly through an explosion Explosive mixture general term A combustible flammable mixture is a mixture of gases or vapours or a mixture of gases and vapours with mists and dusts capable of propelling a reaction after ignition Explosion hazardous area An explosion hazardous area is a location where a potentially explosive atmosphere may exist due to local operating conditions D3007940904 Glossary of terms Industr A Explosion hazard An explosion hazard exists in locations in which ignitable concentrations of flammable gases or vapours can exist under normal operating conditions or because of repair or leakage and when these conditions provide the probability that a dangerous fuel to air mixture will OCCur where the explosive or ignitable mixtures can come in contact with a source of ignition and continue to burn after ignition Explosion protection primary The primary method of explosion protection comprises measures which prevent formation of a dangerous atmosphere avoiding the use of flammable liquids increase of flash point limiting the concentration to safe levels through natural and technical ventilation monitoring the concentration The primary method of protection is not described
41. pler the transmission rate is limited to max 93 75 kbps Pepperl amp Fuchs Koppler or 45 45 kbps SIEMENS coupler Both couplers are not monitored by the DP master so that they do not require parameterisation In short the coupler converts the asynchronous DP protocol with 11 bit byte into the synchronous PA protocol with 8 bit byte The link is an intelligent signal converter It reproduces all field devices connected in an IEC 61158 2 segment as a single slave in the RS485 segment When using links the baud rate in the RS485 segment is not limited Thus it also possible to use fast networks and field devices within a connection acc to IEC61158 2 for instance also for control engineering tasks A link attains only a single address in the DP branch and is treated like a slave However in a PROFIBUS PA branch the link has master functionality All PA devices of a link also over several PA branches have to be considered as a logical bus With PROFIBUS PA system integration is established via a DP PA segment coupler or DP PA link branched off from the PROFIBUS DP fieldbus The following figure Fig 4 1 shows the construction of a PA segment with the multibarrier MBDA8 T415 Ex D300794 0904 47 48 Planning a fieldbus application Host Br i 1 ei o Es SE PROFIBUS DP RS485 men E e End e ert ili DP PA Coupler
42. rent approach It limits the electrical energy of a circuit to such an extent that excessive temperatures cannot occur or arcs and sparcs are incapable of generating the energy needed to ignite an explosive atmosphere Due to the limited energy these circuits are mainly suited to application in the field of measuring control and instrumentation Intrinsic Safety has some inherent advantages over other protection types for example wiring and maintenance of live circuits Intrinsically safe electrical equipment Intrinsically safe electrical equipment is any apparatus in which all circuits are intrinsically safe Direct installation in hazardous locations is permitted provided that all related requirements are met An example is a NAMUR sensor approved according to EN 60947 or a transmitter Increased safety EEx e protection type e EN50019 Protection type e applies to electrical equipment or components of electrical equipment which do not generate sparcs or arcs under normal conditions do not adopt excessive temperatures and whose nominal voltage does not exceed the value of 1 kV MBD Multibarrier MBP Manchester Bus Powered stands for a transmission technology with the attributes Manchester Coding and powering via the bus D3007940904 Glossary of terms Industr A P PTB Physikalisch Technische Bundesanstalt T Temperature classes The temperature class specifies the maximum allowable surf
43. s the characteristics of the transmission technology according to IEC61158 2 Data transfer Digital bit synchronous Manchester coding Transmission speed 31 25 kbps voltage mode Data back up Preamble fail safe start and end delimiter Cable Twisted and shielded 2 wire cable Remote powering and Optionally possible via the signal wires nodes Explosion protection types Intrinsic safety EEx ia ib and encapsulation EEx d m p q Topology Line and tree topology also in combination Number of bus nodes Up to 32 nodes per line segment max 126 in total Repeater Extendable via max 4 repeaters Tab 4 3 Characteristics of IEC 61158 2 transmission technology 4 2 Construction of a fieldbus segment Starting from the control room in which the process control system is usually located it is possible to set up a fieldbus segment according to IEC 61158 2 via a segment coupler or a power conditioner directly in the field 46 D300794 0904 Planning a fieldbus application Industr A 4 2 1 Construction of a PROFIBUS PA segment A PROFIBUS PA network with transmission physics according to IEC 61158 2 is usually set up via a segment coupler or link between a PROFIBUS DP segment with RS485 physics and the PROFIBUS PA network The segment coupler is a signal converter which adapts the RS485 signals to the IEC 61158 2 signal level The bus protocol in this case DP or DP V1 retains its transparency When using a segment cou
44. safe area explosion hazardous area Ex junction junction power supply x terminating Cau R Sa resistor ON GZ field device field device l equipotential bond Fig 2 7 Equipotential bond from the associated apparatus in the safe area to the node in the explosion hazardous area explosion hazardous area x junction safe area power supply junction C Z Cy terminating eet eT D EN resistor field device field device equipotential bond Fig 2 8 Sufficient equipotential bonding only in the explosion hazardous area In Fig 2 9 the cable shield in the safe area is coupled on one side directly to the station earth In the explosion hazardous area the cable shield is coupled capacitively to all further earthing points This variant is frequently used in practice The capacitances to earth will only let high frequency interference pass and may not exceed a total capacity of 10 nF D300794 0904 27 Basics of explosion protection 2 9 28 safe area explosion hazardous area Ex junction MBD junction MBD I I 1 field i field E C C equipotential bond power supply terminating resistor Fig 2 9 Equipotential bond in the safe area connected to station earth at one end and in the explosion hazardous area capacitively to the earth Installation of cables and conductors Feed through openings from the explo
45. sion hazardous to the safe area must be sealed sufficiently This is accomplished by a sand seal box mortar closure or other suited commonly available sealing materials Unused openings for cables and conductors of electrical equipment e g junction modules must be terminated with approved closure caps Within the housing the ends of finely stranded conductors or multi wire cables must be protected against splicing via cable lugs wire sleeves or suitable terminals loosely attached terminals may not be used Outside the electrical equipment conductor connections may only be established via compression connections apart from the intrinsically safe circuits Cables and conductors may generally not be installed in closed pipe systems unless these cable conduit systems are suited for explosion hazardous areas in terms of construction and installation Via such a suited cable conduit system connections to explosion proof housings may be established directly or a tested and approved adapter must be used for the transition of cable and conductor systems Increased requirements apply to the use of cables and conductors in zone O Here the cables and conductors for permanent routing D300794 0904 Basics of explosion protection Industr A must be equipped with a metal jacket a braided copper or a metal shield and additionally feature an outer jacket made of plastic or rubber featuring a flammability performance that has been tes
46. ted according to DIN VDE 0472 part 804 test type B 2 9 1 Cables and conductors in intrinsically safe circuits Cables and conductors in intrinsically safe circuits must meet various special additional requirements However the standard cable materials commonly available generally meet these demands For example the test voltage from conductor to conductor and conductor to earth must be at least 500 VAC Routing more than one intrinsically safe circuit in a cable is permitted under the following conditions The thickness of the conductor insulation must match the conductor diameter under consideration of the type of insulation material The test voltage for the insulation of all connected conductors and the shields or earth must be at least 500 VAC and at least 1000 VAC between a bundle of half the conductors and the other half of the conductors n case of permanent and protected wiring the peak voltage of each circuit may not exceed 60 V or each circuit must have a conductive shield of its own not matter whether permanently or flexibly connected If only one of the above mentioned three conditions is not fulfilled then an error assessment according to EN 50039 or VDE 0170 01 71 part 10 04 82 section 5 3 must be carried out Cables and conductors of intrinsically safe circuits must be marked clearly if a colour is used for this purpose then the colour light blue must be used If there is a risk of interchang
47. tems in explosion hazardous areas except mining DIN EN 50 014 Electrical equipment for explosion hazardous areas General regulations DIN EN 50 019 increased safety e DIN EN 50 020 intrinsic safety i DIN EN 50 028 encapsulation m CENELEC Comit Europ en de Normalisation lectrotechnique European Community for Electrotechnical Standardisation D300794 0904 57 Glossary of terms 58 Category ia Category ia indicates that the electrical equipment should not be able to cause an ignition under normal operating conditions in the event of a single fault or any combination of two faults Intrinsic safety must be ensured even when two independent faults occur at the same time For this reason components used to limit the electrical energy or protective parts of an apparatus of category ia must be present in triplicate Category ib An electrical apparatus category ib should not be capable of causing ignition under normal operating conditions in the event of a single fault Intrinsic safety must be ensured even when a fault occurs Any apparatus in category ib must have all components used to limit the electrical energy and protective parts in duplicate EEx m Encapsulation EEx n Type of protection for devices of category 3G non sparking apparatus Explosive atmosphere An explosive atmosphere contains flammable mixtures of gases vapours mist and dusts with air under atmospheric conditi
48. the explosion protection directive In order to simplify this procedure the PTB has developed the FISCO model Fieldbus Intrinsically Safe COncept in cooperation with renowned manufacturers topic of research intrinsic safety and fieldbus systems The further development of the FISCO model for zone 2 installations is the FNICO model Another model mainly used in the United States is the so called Entity model Following please find a short description of all models 2 5 The FISCO model In the FISCO model typically only a single active device i e the bus power supply is conected to the fieldbus All other devices do not supply any energy via the line and are thus defined as passive Consequently only a single device can supply power via the bus line in the event of an error which always has to be assumed Thus the number of connectable devices is maximised Since the bus power supply unit is the only device that provides energy it is the only equipment that must be equipped with an according current and voltage limiting safety circuitry Tables 2 3 and 2 4 list the limits of the parameter areas for application of the FISCO model for EEx ib IIC IIB or EEx ia IIC These areas are derived from the results of previous studies as well as from extrapolations acceptable from the safety technical aspect It must be stated that the limit values of the bus power supply circuit usually specified i e the max admissible external inductance
49. type approval Electrical equipment of category 3G with Ex n approval is usually constructed in such a way that an ignition of the explosive atmosphere during normal operation and under certain abnormal conditions is excluded The development of this type of protection was aimed at finding a compromise between normal industrial standards and the high requirements of the protection types for electrical equipment of device category 2G zone 1 The Entity model The main difference between the Entity and the FISCO model regards the cable specifications With Entity these are considered as lumped inductances and capacitance whereas FISCO sees these as distributed values With the Entity model the cable values must be included in the calculation which is very complex as a result Even if the fieldbus segment is only expanded by a single device the Entity model requires complete re calculation of the intrinsic safety values Due to this fact less electrical energy can be transferred to the explosion hazardous area The number of connectable bus nodes sinks The guidelines provided in chapter 2 3 concerning intrinsically safe fieldbus sytems apply both to the FISCO and to the Entity model When planning according to the Entity module it is rquired to meet the following criteria to obtain verification of intrinsic safety D300794 0904 Basics of explosion protection Industr A The currents voltages and power specs of all
50. us conditions cannot be excluded The electrical installation has to be carried out in compliance with the applicable regulations e g concerning cable cross sections fuses PE connection etc Transport installation set up and maintenance may only be carried out by qualified staff IEC 60 364 or HD 384 or DIN VDE 0100 and national accident prevention regulations must be observed D300794 0904 Table of Contents Industr A Table of contents O How to work with this manual 7 lu deele lei e essee ened eninecpen aa 11 2 Basics of explosion Drotechon 14 2 1 Zone classification and device categories seessssssss 14 2 1 1 Temperature classes AE 16 2 2 Protection type Intrinsic Safety Ex 17 2 3 Protection type Increased Safety EX nnunnnonnnnnnnnnnnnnnneennnnennnne 19 2 4 Intrinsic safety and fieldbus systems snnessnnennnennennrenrnrernreernreernee 20 2 5 The FISCO model eium adizncdandus indus anat DUE GEN Ur E EE RRacU Mus BC Rs dns 21 2 6 Ihe FNIGO model E 24 2 1 The Entity WO OC RENE AANE aN Aa na a Aia 24 2 8 Shielding and CANNING EE 25 2 9 Installation of cables and conductors 28 2 9 1 Cables and conductors in intrinsically safe circuits 29 2 10 Selection of admissible cable tivpoes 30 3 Operating manual of the multibarrier ccccecseeeeeeceeeeeeeeeeeeeeeeeaeseeseeeaees 32 3 1 Application and function
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