SD Series surge protection devices Ultra-slim user-friendly devices for protecting electronic equipment and systems against surges on signal and I/O cabling uEasy installation – automatic earthing with simple DIN-rail mounting uUltra-slim space-saving design uMultifunctional versatility – a ‘feedthrough’ terminal with surge protection, replaceable fuse and ‘disconnect’ features uMultistage hybrid protection circuitry – 10kA maximum surge current uFully autoresetting – maintenance-free uRange of voltage ratings – to suit all process I/O applications uHigh bandwidth, low resistance, RTD, PSTN and 3-wire transmitter versions available The Telematic SD Series is a range of the SD07, 16, 32 and 55 Surge Protection has been developed to meet the demands of surge protection devices combining Devices. In addition, a third connection on today’s highest speed communication systems. unparalleled packing densities, application the field and safe side of the protector is The SDPSTN version is available for protection versatility, proven reliable hybrid circuitry, provided in order to terminate screens safely. of telecom/modem type applications including simple installation and optional ‘loop telemetry outstations. disconnect’ facilities – features which make Modules with a comprehensive range the series the ultimate surge protection solution of voltage ratings cover all process-related One simple manual operation clamps for process equipment, systems I/O and signals such as RTDs, THCs, 4 to 20mA loops, modules securely onto DIN-rail, an action that communications networks. telemetry outstations, shut-down systems and also automatically provides the essential high- fire and gas detectors. Modules for protecting integrity earth connection. Where a number The exceptionally high packing higher voltage I/O sub-systems with working of SD Series modules are mounted on one densities are the consequence of an ultra voltages up to 240V ac rms are also available. rail, any that are incorrectly mounted (and slim ‘footprint’ for individual modules which therefore not securely earthed) are very can thus ‘double-up’ as feedback terminals. For three wire applications the specially obvious and can easily be remounted correctly. Each module provides full hybrid surge designed SDRTD (Resistance Temperature protection for 2 and 3 wire loop protection. Detector) and the SD32T3, (for separately Standard ‘top-hat’ (T-section) DIN-rail Optional ‘loop disconnect’, is a feature which powered 4-20mA loops) provide full 3-wire is generally suitable for mounting SD Series allows commissioning and maintenance to be protection in a single compact unit, whilst modules – although, for adverse environments, carried out without removal of the Surge maintaining high measurement accuracy. For a specially-plated version is available from Protection Device. This facility is provided by higher bandwidth applications, the SDR series Telematic. Surge protection – the facts Many kinds of process control instrumentation and communication networks can be destroyed by surges (also referred to as “transient over- voltages”) on power, signal and telecommunication lines. This invariably results in expensive downtime. Surges may be caused by lightning, heavy electrical load switching, electrical faults or electrical ‘noise’, from arc welding and other industrial sources. Those induced by lightning are on the increase globally, and it is recognised by European and other international standards that lightning can induce voltage surges of more than 10kV on equipment cables - and a ‘near miss’ can inject more than 5kA of current through electronic circuitry. The only effective way of preventing such damage is to equip all vulnerable connections with surge protection devices (SPDs). These incorporate circuitry designed to divert surges safely to earth, and to control the voltage seen by sensitive equipment. The Telematic range includes SPDs for virtually all applications, including mains power supplies, process instrumentation, PSTN installations and computer networking, thus providing ‘all-round’ protection from one source. These products are available directly from Telematic and from distributors around the world. Further information on all aspects of surge protection can be found in Telematic’s range of Technical Application Notes available by post or downloaded from our Web Site. A member of The MTL Instruments Group plc 904-040 12/99 1 SD SERIES – GUIDE TO APPLICATIONS AND SELECTION The SD Series of SPDs includes models for almost all possible applications operating at voltages up to 250V ac. The optional ‘fuse/disconnect’ package provides both fused protection against fault currents and a convenient method of isolating field circuitry from protected circuitry without needing additional disconnect terminals. The standard fuse (which is replaceable) is rated 250mA with 50mA fuses also being available in packs of 5, by special request. Where only the disconnect feature is required, solid links can be used. As an example, this feature is of particular value in applications in which an SPD is used with a bulk power supply feeding multiple loops. The individual module fuse prevents a fault or follow on current on one loop disrupting the power supply to the others. Also, loops can be removed from the circuit for maintenance reasons or added without needing additional disconnect terminals. The following guide to selection suggests the most suitable SDs for a number of specific applications. For technical information, see the detailed specifications on the back page of this publication (some field circuit protection is shown for completeness). ANALOGUE INPUTS FIELD CIRCUIT PROTECTED CIRCUIT Bulk (HIGH-LEVEL) PSU 2-wire transmitters, 4 to 20mA, Up to 50V dc 4 1 conventional and smart 4/20mA TP48 The SPDs recommended for use with transmitter 5 2 1 to 5V ‘conventional’ and ‘smart’ 4 to 20mA protector transmitters (fed by a well-regulated supply) 6 0V 3 are the SD32 and SD55, the choice depending SD32 SD32X upon the maximum working voltage of the SD55 SD55X (no fuse) Multiple system (32V and 55V respectively). The loops diagram illustrates a prime example of an application for which the fuse/disconnect 2-wire transmitters facility is particularly useful, however, both models are available in ‘X’ versions without the optional fuse/disconnect feature. SDRTD ANALOGUE INPUTS 4 1 Recorder (LOW-LEVEL) Controller RTDs Computer 5 2 etc These applications are best served using the SDRTD. For optimum accuracy, the energising 6 3 current should be chosen to ensure the voltage SDRTD across the RTD does not exceed 1V over the full measurement range. When using a PT100 device, we recommend an energising current 3 wire RTDs of 1mA. 2xSD07X or 2xSD16X ac sensors, photocells, THCs, 4 1 Photocell mV sources and turbine THC Signal 5 2 mV source flowmeters Turbine The SD07 or SD16 (depending upon the 6 3 flowmeter operational voltage) are the favoured choices SD07 SD07X for this application. SD07X and SD16X are SD16 SD16X also suitable. ac sensors, (no fuse) photocells, THCs, mV sources and turbine flowmeters 2 ANALOGUE OUTPUTS FIELD CIRCUIT PROTECTED CIRCUIT Controller outputs (I/P 2xSD16X, SD32X converters) 4 1 For this application, the recommendations are V P the SD16, SD32 and SD55 (and the equivalent I 5 2 ‘X’ versions), the final choice depending upon 0V the operating voltage. 6 3 SD16X SD16 SD32X SD32 SD55X SD55 (no fuse) Controller outputs (I/P converters) SD DIGITAL (ON/OFF) INPUTS 4 1 V Switches Suitable SPDs for switches include the SD07, 5 2 Logic signal SD16, SD32 and SD55 modules – the choice depending upon the operating voltage of the 6 3 0V SD07X system. The ‘X’ versions of these are also SD07 SD16X SD16 suitable. SD32X SD55X SD32 (no fuse) SD55 Switches DIGITAL (ON/OFF) SD32X 4 1 32V max OUTPUTS LED Alarms, LEDs, solenoid Alarm 5 2 valves, etc The recommended choice for this application 6 3 is the SD32 or SD32X. SD32 SD32X (no fuse) Alarms, LEDs, solenoid valves, etc TELEMETRY (PSTN) Telemetry outstations Modem, Incoming fax or The SDPSTN has been designed specifically for telephone telephone the protection of signals transmitted on public line switched telephone networks. SDPSTN Telecom line Final output from AC SUPPLIED EQUIPMENT 4 1 110/120V ac PLC, PLC, I/O systems DCS or For systems on 110-120V ac, the SD150X is SCADA 220/240V ac 5 2 etc the recommended choice and for 220-240V ac systems, the SD275X is recommended. 6 3 SD150X SD275X PLC, I/O systems 3 TRANSMITTER AND SENSOR PROTECTION Transmitters and sensors are widely used in highly exposed areas and where lightning damage is common. In many cases, the ideal solution for 2-wire transmitters or sensors is the TP48 which mounts directly onto the transmitter housing via spare cable entries. Where these entries are not available or 3-wire devices are used, the compact design and simple installation of the SD series makes it the obvious choice for transmitter protection. The SDs within the junction box should be installed no further than one metre away but as close as possible to the sensor or transmitter they are protecting. A bond is required from the general mass of steelwork to the sensor or transmitter housing either using a flat short braid or a cable of 2 at least 4mm cross sectional area. In most instances this bond is automatically made by fixing the metallic transmitter housing to the plant structure. This bond ensures the voltage difference between the signal conductors and the transmitter housing is below the transmitter’s insulation rating. Please note that the transmitters or sensors are connected to the ‘Protected Equipment’ terminals of the SD and not the ‘Field Cables’. 2-WIRE TRANSMITTERS OR PROTECTED CIRCUIT FIELD CIRCUIT SENSORS 4 to 20mA transmitters, 1 4 conventional and smart Where the TP48 is not an acceptable solution, 4-20mA 2 5 either because of technical suitability or difficulties in mounting, the SD16X, SD32X and Plant 6 3 structure SD16X SD55X are an excellent alternative. SD32X SD55X SPD DIN rail 2-wire transmitter or sensor 3-WIRE TRANSMITTERS OR SENSORS 1 4 24V Vibration Sensors and 4-20mA loop process control systems invariably require three wire 2 5 4-20mA connections, when powered from an external 3 6 source. Common 0V Plant structure This may be accomplished in one unit by using SD32T3 the SD32T3 three terminal Surge Protection Device (SPD). Because the SD32T3 protects all three conductors within the same unit, higher protection is achieved, as the SPD hybrid SPD DIN rail circuitry is common to all three wires. 3-wire transmitter or sensor 1 4 4-WIRE TRANSMITTERS OR 4-20mA SENSORS 2 5 Flow meters, level detectors, 6 etc. 3 4-wire systems such as level detectors require two SDs, one for the supply and the other for 1 Plant 4 Supply voltage the transmitter output. Generally the voltages structure across the pairs are similar and so the 2 5 Supply 0V recommended choice would be a pair of SD16X, SD32X or SD55Xs. However, mains 3 6 SD16X powered transmitters should be protected with SD32X an SD150X or 275X (depending upon supply SD55X voltage) for the supply inputs. Loadcells are catered for by Telematic’s LC30 which is suitable for both 4 and 6-wire load SPD DIN rail cells. 4-wire transmitter or sensor 4 COMMUNICATION SYSTEMS PROTECTION High speed data links between buildings or one part of a plant to another have become more common with the widespread use of smart transmitters and the increase in unmanned installations. The SD series has an SPD suitable for all process I/O applications with a choice of low resistance units, high bandwidth and a variety of voltage variants. The SDR series has been specially designed to meet the requirements for high speed data links with an extremely high bandwidth. COMMUNICATION FIELD CIRCUIT PROTECTED CIRCUIT SYSTEMS RS232, RS422, RS485 The recommended choice for these 4 1 TP48 applications is the SD16R or SD32R depending on the maximum driver signal. 5 2 6 3 SD16R SD32R (no fuse) RS232, RS422, RS485 Bus powered systems FIELD CIRCUIT PROTECTED CIRCUIT There are a variety of bus powered systems specially designed for the process industry. The 1 4 4 1 ideal surge protection device for these systems 2 5 5 2 is the SD32R as it has a very high bandwidth and a modest in-line resistance. 3 6 6 3 SD32R SD32R (no fuse) (no fuse) TP48 4 1 5 2 6 3 SD32R (no fuse) Bus powered systems Table 1 Typical Applications Table 1 shows suitable SD devices for different Application Preferred SPD Alternative applications. In some applications alternative Allen Bradley Data Highway Plus SD16R devices may be used, for example, where FOUNDATION Fieldbus lower in-line resistance or a higher voltage 31.25kbits/s voltage mode SD32R 1.0/2.5 Mbits/s SD55R power supply is used. HART SD32X SD32, SD32R Honeywell DE SD32X SD32, SD32R Telematic have operationally tested the LONWORKS recommended SD series with representative FFT-10 SD32R LPT-10 SD55R highways listed but no formal approval for their TP-78 SD07R use in systems by the respective bodies has IS78† SD32R been sought. Modbus & Modbus Plus (RS485) SD16R PROFIBUS DP SD32R PA (IEC 1158, 31.25 kbits/s) SD32R RS232 SD16 SD16X RS422 SD16R RS423 SD16R RS485 SD16R WorldFIP (IEC 1158) 31.25 kbits/s voltage mode SD32R 1.0/2.5 Mbits/s SD55R 5 HAZARDOUS AREA APPLICATIONS to each other but on separate DIN rails in order Zone 0/Zone 1 The SD07R, SD16R, SD32R and SD55R surge to maintain the required 50mm clearance protection devices are simple apparatus and The dangers from lightning induced sparking between safe area and hazardous area can therefore be used in hazardous areas in Zone 0 are considered real enough to re- terminals. without affecting the certification of the circuit. quire preventative measures. IEC 60079-14 The SD07, SD16, SD32 and SD55 are also (1996-12) Electrical apparatus for explosive simple apparatus, with L = 220μH, but i Earthing gas atmospheres Part 14: Electrical installa- because their replaceable fuses are not fully tions in hazardous areas (other than mines) encapsulated they can only be used in Zone 2 The recommended earthing for field mounted stresses the importance of SPDs in hazardous or safe areas. devices has been illustrated previously but it is areas. An outdoor installation where there is the earthing at the control panel that is more a high likelihood of both lightning induced tran- critical as there are usually a number of earth- sients and combustible gases requires the in- INSTALLATION ing systems, each with their own requirements. stallation of SPDs to prevent possible ignition of The earthing system illustrated here replaces the gases. Areas seen particularly at risk in- the instrument 0V bond, the control system PSU Positioning clude flammable liquid storage tanks, bond and the IS earth with one single earth effluent treatment plants, distillation columns connection to meet all the design The SDs should be mounted on the field wiring in petrochemical works and gas pipelines. side to ensure that any surges entering from requirements and give the most effective the field do not damage any intrinsically safe protection against the effects of lightning SPDs for transmitter protection should be barriers or galvanic isolators in the system. The induced surges. installed in Zone 1 but sufficiently close to the SDs and IS interfaces should be mounted close Zone 0 boundary to prevent high voltages entering Zone 0. The distance from the SPD to Zone 0 should be less than one metre where possible. However, in practice the SPD would normally be mounted on the transmitter or sen- IS barrier DIN rail SD series DIN rail sor housing which usually lies in Zone 1 and is very close to Zone 0. Because there is only Instrument Field cables a very small free volume, the SD Series is suit- able for mounting in flameproof or explosion proof enclosures. IS SD Zone 2 The SD series is suitable for protecting electri- cal circuits in Division 2, Zone 2 and can be used without affecting the safety aspects of the circuit. Non-incendive (low-current) circuits can Instrument earth be protected using any SD series unit mounted in either the safe or hazardous area including Substation ground mat those with the fuse disconnect facility. Non arc- ing (high current) circuits can also be protected except that SPDs with the fuse disconnect facility may only be mounted in the safe area. For use in these circuits the units must be mounted in a suitable enclosure, nor- System mally the minimum requirements are IP54 and connection System cabinet Marshalling cabinet 7Nm resistance to impact. The SD series is cable self certified by Telematic Ltd as being suitable for this purpose. SPD Certification Introducing surge protection into Intrinsically Safe (IS) circuits is trouble-free as long as the current and power parameters are not ex- ceeded (for more information refer to Telematic Isolated instrument rail Isolated instrument rail application notes TAN1004 and TAN1005). The SD07X , SD16X, SD32X and SD55X all Electrical earth have BASEEFA certification for use in IS cir- cuits located in Zones 0, 1 or 2. Their certifi- Electrical earth cation parameters are: Frame connection EEx ia IIC T4, I = 186mA, L = 220μH, with i i the power rating dependant on the ambient Floor void To plant/neutral temperature.,P = 1W (T =–30°C to +75°C) i amb star point System earth or P = 1.2W (T =–30°C to +60°C) i amb or P = 1.3W (T =–30°C to +40°C) i amb 6 SD SERIES MOUNTING KITS AND ACCESSORIES The SD Series has a full range of mounting kits and accessories to simplify installation and tagging of individual loops. Insulating spacers (SD-ISP) are available to allow mounting of the units onto backplanes without compromising correct earthing practice. These are placed at regular intervals along the rail or at each end as required. Earth connections can be made to the DIN-rail via the earth terminal (SD-ETL). Weatherproof enclosures are also available with all the necessary mounting accessories to install the SD series surge protection devices. Two tagging systems are available. One consists of tagging strips (SD-TAG) with labels (SD-TGL) mounted on posts (SD-IMB) at each end of a row of surge protection devices (SPDs). The other consists of separate tagging identifiers (SD-BRI - supplied in packs of 10) mounted on the tops of individual SPDs. Both methods can be used conjointly. Replaceable fuses or solid links are available in packs of 5 (SD-F25, SD-F05 and SD-LNK). 1 SD-BRI SD-BIL SD-TGS 2 SD-TAG SD-TGL SD-IMB SD-ETL SD-THR SD-ISP Accessories (mounting) DIMENSIONS (mm) SD-ETL Earth terminals SD-ISP Insulating spacers +0.4 7.0 -0.0 SD-THR Plated DIN-rail Accessories (tagging–group) SD-IMB Mounting blocks (two needed) SD-TAG Tagging strip (1m length, with one SD-TGL strip) SD-TGL Spare labelling strip for SD-TAG (1m length) 4 1 SD-TGS Tagging strip seal (available in packs 10) Accessories (tagging–individual) 5 2 SD-BRI Module identifier (available in packs 10) SD-BIL-A4 Labels (supplied as A4-size sheet for pre-printing by user) 63 Enclosures SD-DX070 Enclosure for up to 8 SD series SPDs SD-DX170 Enclosure for up to 20 SD series SPDs SD-DX430 Enclosure for up to 58 SD series SPDs Accessories (replacement) SD-F25 Replaceable fuse pack - 250mA standard (available in packs of 5) SD-F05 Replaceable fuse pack - 50mA special (available in packs of 5) 99 SD-LNK Solid Link (available in packs of 5) 7 101.3 102.1 (7mm rail) 109.6 (15mm rail) SPECIFICATIONS 12345 0 Max. (all figures typical at 25 C unless otherwise stated) Model Working Rated Nominal Max. continuous Limiting Band- Special Protection voltage+ load resistance leakage operating voltage width Features Full hybrid line to line current current voltage (V) (mA) (Ω/line) (μA) (V) (V) Each line to screen/ground GDT rating SD07 7 50 or 250* 4.2† 500 7.7 30 25kHz Fuse Disconnect 10kA (8/20μs), SD16 16 50 or 250* 4.2† 5 17 40 25kHz Fuse Disconnect (not applicable to SD150X and SD275X) SD32 32 50 or 250* 4.2† 5 36 60 25kHz Fuse Disconnect SD55 55 50 or 250* 4.2† 5 62 100 25kHz Fuse Disconnect MOV rating 6.5kA (8/20μs), SD07R 7 400 2.7 500 7.7 30 50MHz High Bandwidth (SD150X and SD275X only) SD16R 16 400 4.7 5 17 40 50MHz High Bandwidth SD32R 32 400 10.0 5 36 60 50MHz High Bandwidth Reaction time –9 SD55R 55 400 10.0 5 62 100 50MHz High Bandwidth Within nanoseconds (10 s) RTD resistance range (SDRTD) SD07X 7 400 2.2 500 7.7 30 25kHz Low Resistance 10 to 1500Ω SD16X 16 400 2.2 5 17 40 25kHz Low Resistance SD32X 32 400 2.2 5 36 60 25kHz Low Resistance Degradation accuracy (SDRTD at 1mA) SD55X 55 400 2.2 5 62 100 25kHz Low Resistance 0.1% (RTD resistance ≥ 100Ω) 0.1Ω (RTD resistance < 100Ω) SD32T3 32 250 2.2^ 5 36 60 720kHz 3 Terminal device 10** Ambient temperature –30°C to +75°C (working) SDRTD 1 1-10C2.7 0.3 7.7 30 50MHz 3 wire RTD –40°C to +80°C (storage) SDPSTN 162 550 4.7 5 175 234 4MHz PSTN Humidity 5 to 95% RH (non-condensing) ac rms ac rms dc ac rms Terminals SD150X 120 3A‡ 0.1 250 150 132 450 - High Current 2 SD275X 240 3A‡ 0.1 250 275 275 850 - High Current 2.5mm (12 AWG) Mounting Note: all figures are typical at +25°C unless otherwise stated; *standard fuse; +over full working temperature range; †at 20mA with T-section DIN-rail a 250mA standard fuse; ‡these units need external 3A fuses; ^Signal; **Power & Common; Cmaximum energising current depends (35 x 7.5 or 35 x 15mm rail) upon RTD resistance. See page 2 for details. Weight Definitions of terminology used in table 70g approximately 1 Working voltage 4 Limiting voltage Maximum voltage between lines or lines/ground for Peak output voltage after injection of test impulse from Case flammability the specified leakage current 6kV/3kA combination waveform generator (often UL94 V-2 2 Maximum leakage current known as ‘let-through’ voltage) EMC compliance Maximum current drawn by the SPD at the working 5 Bandwidth To Generic Immunity Standards, voltage Frequency range up to which ac signals can be trans- 3 Maximum continuous operating voltage EN 50082, part 2 for industrial mitted without undue attenuation; 3dB into 50Ω (600Ω Maximum voltage that can be applied to the protected for the SDPSTN) environments terminals without damage LVD compliance SD150X & SD275X EN 60950 : 1992 APPROVALS EN 61010 : 1995 Country Standard Certificate/File No. Approved for Product SDPSTN (Authority) EN 41003 : 1993 UK (BASEEFA) EN 50014 & Ex96D2219X EEx ia IIC T4* SD07X, SD16X, EN 50020 SD32X, SD55X SD32T3 TO ORDER:- Hungary(BKI) EN 50014 & Ex-97.C.355X EEx ia IIC T4* SD07X, SD16X, Order by module and/or accessory EN 50020 SD32X, SD55X part numbers CANADA (CSA) CSA C22.2 No. 0-M1991 LR 103652-3 EEx ia Class 1, SD07X, SD16X CSA C22.2 No. 157-M1992 Groups A, B SD32X, SD55X In accordance with its policy of continuous UL 913, Fifth edition C and D, T4 improvement, Telematic reserves the right UK (Oftel) BS EN60950 NS/G/1235/W/100025 PSTN SDPSTN to change the product’s specification Austel AS/NZ3548:1995 _ Private Wire SD07R without notice. AS/NZS4117:1996 TS001: 1997 * See page 6 for further details SCHEMATIC DIAGRAMS Fuse 4 1 1 1 4 4 4 1 4 1 4 1 4 1 5 2 5 2 5 2 5 2 5 2 5 2 5 2 6 3 6 3 6 3 6 3 6 3 6 3 3 6 SD07, SD16 SD07R, SD16R SD07X, SD16X SDPSTN SD150X, SD275X SD32T3 SDRTD SD32, SD55 SD32R, SD55R SD32X, SD55X Telematic Limited Alban Park, Hatfield Road, St. Albans, Hertfordshire AL4 0XY Telephone +44 (0)1727 833147 Fax +44 (0)1727 850687 E-mail enquiry@telematic.com Web site http://www.telematic.com A member of The MTL Instruments Group plc 8 12/99 Printed in the EU Field circuit Protected circuit