For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit.

Transcription

1 Current Transducer LESR series N = 6, 15, 25, 5 A Ref: LESR 6-NP, LESR 15-NP, LESR 25-NP, LESR 5-NP For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit. Features Closed loop multi-range current transducer Voltage output Unipolar supply voltage Compact design for PCB mounting. Advantages Very low offset drift Very good dv/dt immunity CASR footprint compatible Reference pin with two modes: Ref IN and Ref OUT Extended measuring range for unipolar measurement. Applications AC variable speed and servo motor drives Static converters for DC motor drives Battery supplied applications Uninterruptible Power Supplies (UPS) Switched Mode Power Supplies (SMPS) Power supplies for welding applications Solar inverters. Standards IEC 618-1: 1997 IEC 618-2: 215 IEC 618-3: 24 IEC : 27 IEC : 21 IEC : 212 UL 58:213. Application Domain Industrial. N 97.O8.9.., N 97.O8.15.., N 97.O8.19.., N 97.O Page 1/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

2 Absolute maximum ratings Parameter Symbol Unit Value Maximum supply voltage U C max V 7 Maximum primary conductor temperature T B max C 11 Maximum primary current max A 2 N Maximum electrostatic discharge voltage U ESD max kv 4 Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. UL 58: Ratings and assumptions of certification File # E Volume: 2 Section: 11 Standards CSA C22.2 NO INDUSTRIAL CONTROL EQUIPMENT - Date 211/8/1 UL 58 STANDARD FOR INDUSTRIAL CONTROL EQUIPMENT - Date 213 Ratings Parameter Symbol Unit Value Primary involved potential V AC/DC 6 Max surrounding air temperature T A C 15 Primary current A According to series primary currents Secondary supply voltage U C V DC 7 Output voltage V to 5 Conditions of acceptability When installed in the end-use equipment, consideration shall be given to the following: 1 - These devices must be mounted in a suitable end-use enclosure. 2 - The terminals have not been evaluated for field wiring. 3 - The LES, LESR, LKSR, LPSR, LXS and LXSR Series shall be used in a pollution degree 2 environment or better. 4 - Low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as a transformer, optical isolator, limiting impedance or electro-mechanical relay) and having no direct connection back to the primary circuit (other than through the grounding means). 5 - These devices are intended to be mounted on the printed wiring board of the end-use equipment (with a minimum CTI of 1). 6 - LES, LESR, LKSR and LPSR Series: based on results of temperature tests, in the end-use application, a maximum of 11 C cannot be exceeded on the primary jumper. Marking Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL s Follow- Up Service. Always look for the Mark on the product. Page 2/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

3 Insulation coordination Parameter Symbol Unit Value Comment RMS voltage for AC insulation test, 5 Hz, 1 min U d kv 4.3 Impulse withstand voltage 1.2/5 μs Û W kv 8 Insulation resistance R INS GΩ 18 measured at 5 V DC Partial discharge RMS test voltage (q m < 1 pc) U t kv 1.65 Clearance (pri. - sec.) d CI mm Creepage distance (pri. - sec.) Case material - - d Cp V according to UL 94 Comparative tracking index CTI 6 Application example Application example V V 3 V CAT III, PD2 6 V CAT III, PD2 See dimensions drawing on page 19 Reinforced insulation, non uniform field according to IEC Basic insulation, non uniform field according to IEC Environmental and mechanical characteristics Parameter Symbol Unit Min Typ Max Comment Ambient operating temperature T A C 4 15 Ambient storage temperature T S C Mass m g 1 Page 3/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

4 Electrical data LESR 6-NP At T A = 25 C, U C = +5 V, N P = 1 turn, R L = 1 kω internal reference, unless otherwise noted (see Definition of typical, minimum and maximum values paragraph in page 18). Parameter Symbol Unit Min Typ Max Comment Primary nominal RMS current N A 6 Primary current, measuring range M A 2 2 Number of primary turns N P 1, 2, 3 Supply voltage U C V Apply derating according to fig. 21 Current consumption I C ma I ( ma) P 17 + N S I ( ma) P N 2 + N S = 2 turns S Reference = A V Internal reference External reference voltage V Output voltage V with U C = +5 V Output = A V Electrical offset voltage V O E mv % tested Electrical offset current referred to primary I O E ma % tested Temperature coefficient = A TC ppm/k ±7 Internal reference Temperature coefficient = A TC ppm/k ±14 ppm/k of 2.5 V 4 C 15 C Theoretical sensitivity G th mv/a mv N Sensitivity error ε G % % tested Temperature coefficient of G TCG ppm/k ±4 4 C 15 C Linearity error ε L % of N.1.1 Magnetic offset current (1 N ) referred to primary I O M ma Output RMS voltage noise spectral density 1 1 khz referred to primary e no µv/hz½ 7 Output voltage noise DC 1 khz DC 1 khz DC 1 MHz V no mvpp Reaction 1 % of N t ra µs.3 R L = 1 kω, di/dt = 5 A/µs Step response time to 9 % of N t r µs.4 R L = 1 kω, di/dt = 5 A/µs Frequency bandwidth (±1 db) BW khz 3 R L = 1 kω Overall accuracy X G % of N 1.25 Overall T A = 85 C (15 C) X G % of N 1.25 (1.5) Accuracy X % of N.5 T A = 85 C (15 C) X % of N.75 (1) Page 4/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

5 Electrical data LESR 15-NP At T A = 25 C, U C = +5 V, N P = 1 turn, R L = 1 kω internal reference, unless otherwise noted (see Definition of typical, minimum and maximum values paragraph in page 18). Parameter Symbol Unit Min Typ Max Comment Primary nominal RMS current N A 15 Primary current, measuring range M A Number of primary turns N P 1, 2, 3 Supply voltage U C V Apply derating according to fig. 22 Current consumption I C ma I ( ma) P 17 + N S I ( ma) P N 2 + N S = 2 turns S Reference = A V Internal reference External reference voltage V Output voltage V with U C = +5 V Output = A V Electrical offset voltage V O E mv % tested Electrical offset current referred to primary I O E ma % tested Temperature coefficient = A TC ppm/k ±7 Internal reference Temperature coefficient = A TC ppm/k ±6 ppm/k of 2.5 V 4 C 15 C Theoretical sensitivity G th mv/a mv N Sensitivity error ε G % % tested Temperature coefficient of G TCG ppm/k ±4 4 C 15 C Linearity error ε L % of N.1.1 Magnetic offset current (1 N ) referred to primary I O M Output RMS voltage noise spectral density 1 1 khz referred to primary e no µv/hz½ 3.5 Output voltage noise DC 1 khz DC 1 khz DC 1 MHz V no mvpp Reaction 1 % of N t ra µs.3 R L = 1 kω, di/dt = 5 A/µs Step response time to 9 % of N t r µs.4 R L = 1 kω, di/dt = 5 A/µs Frequency bandwidth (±3 db) BW khz 3 R L = 1 kω Overall accuracy X G % of N.75 Overall T A = 85 C (15 C) X G % of N.75 (1) Accuracy X % of N.5 T A = 85 C (15 C) X % of N.65 (.75) Page 5/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

6 Electrical data LESR 25-NP At T A = 25 C, U C = +5 V, N P = 1 turn, R L = 1 kω internal reference, unless otherwise noted (see Definition of typical, minimum and maximum values paragraph in page 18). Parameter Symbol Unit Min Typ Max Comment Primary nominal RMS current N A 25 Primary current, measuring range M A Number of primary turns N P 1, 2, 3 Supply voltage U C V Apply derating according to fig. 23 Current consumption I C ma I ( ma) P 17 + N S I ( ma) P N 2 + N S = 2 turns S Reference = A V Internal reference External reference voltage V Output voltage V with U C = +5 V Output = A V Electrical offset voltage V O E mv % tested Electrical offset current referred to primary I O E ma % tested Temperature coefficient = A TC ppm/k ±7 Internal reference Temperature coefficient = A TC ppm/k ±4 ppm/k of 2.5 V 4 C 15 C Theoretical sensitivity G th mv/a mv N Sensitivity error ε G % % tested Temperature coefficient of G TCG ppm/k ±4 4 C 15 C Linearity error ε L % of N.1.1 Magnetic offset current (1 N ) referred to primary I O M ma 6 6 Output RMS voltage noise spectral density 1 1 khz referred to primary e no µv/hz½ 1.8 Output voltage noise DC 1 khz DC 1 khz DC 1 MHz V no mvpp Reaction 1 % of N t ra µs.3 R L = 1 kω, di/dt = 5 A/µs Step response time to 9 % of N t r µs.4 R L = 1 kω, di/dt = 5 A/µs Frequency bandwidth (±3 db) BW khz 3 R L = 1 kω Overall accuracy X G % of N Overall T A = 85 C (15 C) X G % of N.85 (.9) Accuracy X % of N.5 T A = 85 C (15 C) X % of N.65 (.75) Page 6/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

7 Electrical data LESR 5-NP At T A = 25 C, U C = +5 V, N P = 1 turn, R L = 1 kω internal reference, unless otherwise noted (see Definition of typical, minimum and maximum values paragraph in page 18). Parameter Symbol Unit Min Typ Max Comment Primary nominal RMS current N A 5 Primary current, measuring range M A Number of primary turns N P 1, 2, 3 Supply voltage U C V Apply derating according to fig. 24 Current consumption I C ma I ( ma) P 17 + N S I ( ma) P N 2 + N S = 16 turns S Reference = A V Internal reference External reference voltage V Output voltage V with U C = +5 V Output = A V Electrical offset voltage V O E mv % tested Electrical offset current referred to primary I O E ma % tested Temperature coefficient = A TC ppm/k ±7 Internal reference Temperature coefficient = A TC ppm/k ±3 ppm/k of 2.5 V 4 C 15 C Theoretical sensitivity G th mv/a mv N Sensitivity error ε G % % tested Temperature coefficient of G TCG ppm/k ±4 4 C 15 C Linearity error ε L % of N.1.1 Magnetic offset current (1 N ) referred to primary I O M ma 6 6 Output RMS voltage noise spectral density 1 1 khz referred to primary e no µv/hz½ 1.7 Output voltage noise DC 1 khz DC 1 khz DC 1 MHz V no mvpp Reaction 1 % of N t ra µs.3 R L = 1 kω, di/dt = 5 A/µs Step response time to 9 % of N t r µs.4 R L = 1 kω, di/dt = 5 A/µs Frequency bandwidth (±3 db) BW khz 3 R L = 1 kω Overall accuracy X G % of N Overall T A = 85 C (15 C) X G % of N.7 (.8) Accuracy X % of N.5 T A = 85 C (15 C) X % of N.65 (.75) Page 7/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

8 Typical performance characteristics LESR 6-NP.1 4 Rel. Sensitivity Phase Linearity Error [ % N ].5 Relative Sensitivity [db] Phase [ ] I [A] P Frequency [Hz] Figure 1: Linearity error Figure 2: Frequency response V out t (µs) Figure 3: Step response e no (µvrms/ Hz 1/2 ) Primary Voltage V P 4 2 V P kv/µs f c (Hz) t (µs) Figure 4: Output noise voltage spectral density Figure 5: dv/dt Page 8/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

9 Typical performance characteristics LESR 15-NP.1 4 Rel. Sensitivity Phase Linearity Error [ % N ].5 Relative Sensitivity [db] Phase [ ] I [A] P Figure 6: Linearity error Frequency [Hz] Figure 7: Frequency response V out t (µs) Figure 8: Step response e no (µvrms/ Hz 1/2 ) 1 1 Primary Voltage V P 4 2 V P kv/µs f c (Hz) t (µs) Figure 9: Output noise voltage spectral density Figure 1: dv/dt Page 9/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

10 Typical performance characteristics LESR 25-NP.1 4 Rel. Sensitivity Phase Linearity Error [ % N ].5 Relative Sensitivity [db] Phase [ ] [A] Figure 11: Linearity error Frequency [Hz] Figure 12: Frequency response V out t (µs) Figure 13: Step response e no (µvrms/ Hz 1/2 ) 1 1 Primary Voltage V P 4 2 V P kv/µs f c (Hz) t (µs) Figure 14: Output noise voltage spectral density Figure 15: dv/dt Page 1/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

11 Typical performance characteristics LESR 5-NP.1 4 Rel. Sensitivity Phase Linearity Error [ % N ].5 Relative Sensitivity [db] Phase [ ] [A] Figure 16: Linearity error Frequency [Hz] Figure 17: Frequency response V out t (µs) Figure 18: Step response e no (µvrms/ Hz 1/2 ) f c (Hz) Figure 19: Output noise voltage spectral density Primary Voltage V P Figure 2: dv/dt 2 kv/µs V P t (µs) Page 11/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

12 Maximum continuous DC primary current T A ( C) T A ( C) Figure 21: vs T A for LESR 6-NP Figure 22: vs T A for LESR 15-NP T A ( C) T A ( C) Figure 23: vs T A for LESR 25-NP Figure 24: vs T A for LESR 5-NP The maximum continuous DC primary current plot shows the boundary of the area for which all the following conditions are true: -- < M -- Junction temperature T J < 125 C -- Primary conductor temperature < 11 C -- Max power dissipation of internal resistors <.5 resistors nominal power Frequency derating I p AC derating 1.33 max AC rms current / max DC rms current k 1k 1k 1M f c (Hz) Figure 25: Maximum RMS AC primary current / maximum DC primary current vs frequency Page 12/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

13 Performance parameters definition Ampere-turns and amperes The transducer is sensitive to the primary current linkage Θ P (also called ampere-turns). Θ P = N P (At) Where N P is the number of primary turn (depending on the connection of the primary jumpers) Caution: As most applications will use the transducer with only one single primary turn (N P = 1), much of this datasheet is written in terms of primary current instead of current linkages. However, the ampere-turns (At) unit is used to emphasis that current linkages are intended and applicable. Transducer simplified model The static model of the transducer at temperature T A is: I S = G Θ P + ε In which ε = I O E + I O T (T A ) + ε G Θ P G + ε L (Θ P max ) Θ P max G + TCG (T A 25) Θ P G Magnetic offset The magnetic offset current I O M is the consequence of a current on the primary side ( memory effect of the transducer s ferromagnetic parts). It is measured using the following primary current cycle. I O M depends on the current value 1 (1 > M ). N A 1 t 1 t 2 1 IO M = 2 G th (DC) ( ) t 1 ( ) t 2 t With: Θ P = N P : primary current linkage (At) Θ P max : max primary current linkage applied to the transducer I S : secondary current T A : ambient operating temperature ( C) I O E : electrical offset current I O T (T A ) : temperature variation of I O at temperature T A ( C) G : sensitivity of the transducer (V/At) TCG : temperature coefficient of G ε G ε L (Θ P max ) : sensitivity error : linearity error for Θ P max Figure 26: Current cycle used to measure magnetic and electrical offset (transducer supplied) This model is valid for primary ampere-turns Θ P between Θ P max and +Θ P max only. Sensitivity and linearity To measure sensitivity and linearity, the primary current (DC) is cycled from to, then to and back to (equally spaced /1 steps). The sensitivity G is defined as the slope of the linear regression line for a cycle between ± N. The linearity error ε L is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of N. Page 13/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

14 Performance parameters definition Electrical offset The electrical offset voltage V O E can either be measured when the ferro-magnetic parts of the transducer are: Completely demagnetized, which is difficult to realize, or in a known magnetization state, like in the current cycle shown in figure 26. Using the current cycle shown in figure 26, the electrical offset is: V O E = (t 1 ) + (t 2 ) 2 The temperature variation V O T of the electrical offset voltage V O E is the variation of the electrical offset from 25 C to the considered temperature: V O T (T) = V O E (T) V (25 C) O E Overall accuracy The overall accuracy at 25 C X G is the error in the N + N range, relative to the rated value N. It includes: the electrical offset V O E the sensitivity error ε G the linearity error ε L (to N ) Response and reaction times The response time t r and the reaction time t ra are shown in figure 28. Both depend on the primary current di/dt. They are measured at nominal ampere-turns. I Note: the transducer has to be demagnetized prior to the application of the current cycle (for example with a demagnetization tunnel). 1 % 9 % I p V out t r +U C 1 % R M R L t ra t Figure 28: Response time t r and reaction time t ra Figure 27: Test connection Page 14/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

15 Application information Filtering and decoupling Supply voltage U C The transducer has internal decoupling capacitors, but in the case of a power supply with high impedance, it is highly recommended to provide local decoupling (1 nf or more, located close to the transducer) as it may reduce disturbance on transducer output and reference due to high varying primary current. The transducer power supply rejection ratio is low at high frequency. Reference Like the output, the has a very low output impedance of typically 1 Ohm; it can drive capacitive loads of up to 1 nf directly. Adding series resistance Rf of several tenths of Ohms allows much larger capacitive loads Cf (higher than 1 µf). Empirical evaluation may be necessary to obtain optimum results. The minimum load resistance on is 1 kohms. +U C Output The output has a very low output impedance of typically 1 Ohm; it can drive capacitive loads of up to 1 nf directly. Adding series resistance Rf of several tenths of Ohms allows much larger capacitive loads Cf (higher than 1 µf). Empirical evaluation may be necessary to obtain optimum results. The minimum load resistance on is 1 kohm. Total Primary Resistance The primary resistance is.72 mω per conductor. In the following table, examples of primary resistance according to the number of primary turns. Figure 29: filtered connection R M Number of primary turns Primary Nominal RMS current Output voltage Primary resistance R P [mω] 1 ± N ± ± N /2 ± ± N /3 ± Recommended connections OUT IN OUT IN OUT IN Page 15/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

16 External reference voltage The REF pin can be used either as a reference voltage output or as a reference voltage input. When used in reference voltage output, the internal reference voltage is used by the transducer as the reference point for bipolar measurements. The internal reference voltage output accuracy is defined in the electrical parameter data. When used in reference voltage input, an external reference voltage is connected to the REF pin. In this case, the maximun allowable reference voltage range is.5 V V. The REF pin must be able to source or sink an input current of 1.5 ma maximum. If the reference voltage is not used, the REF pin should be left unconnected. The following graphs shows the pin current versus forced external. M V M V Figure 3: Measuring range versus external LESR 6-NP Figure 31: Measuring range versus external LESR 15-NP Upper limit: = 9.6 * ( = V) Upper limit: = 24 * ( = V) Lower limit: = 9.6 * ( = V) Lower limit: = 24 * + 6 ( = 2.75 V) Page 16/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

17 External reference voltage M V M V Figure 32: Measuring range versus external LESR 25-NP Figure 33: Measuring range versus external LESR 5-NP Upper limit: = 4 * + 19 ( = V) Upper limit: = 113 ( = 1.85 V) Upper limit: = 15 ( = 2.75 V) Lower limit: = 4 * + 1 ( = 2.75 V) Lower limit: = 8 * + 2 ( = V) Lower limit: = 15 ( = V) Example with = 1.65 V: The 6 A version has a measuring range from A to A The 15 A version has a measuring range from 33.6 A to A The 25 A version has a measuring range from 56 A to +113 A The 5 A version has a measuring range from 112 A to +15 A Example with Vref =.5 V: The 6 A version has a measuring range from 2.4 A to +4.8 A The 15 A version has a measuring range from 6 A to +12 A The 25 A version has a measuring range from 1 A to +113 A The 5 A version has a measuring range from 2 A to +15 A Page 17/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

18 PCB footprint Assembly on PCB Recommended PCB hole diameter Maximum PCB thickness Wave soldering profile No clean process only 1.3 mm for primary pin.8 mm for secondary pin 2.4 mm maximum 26 C for 1 s Safety This transducer must be used in limited-energy secondary circuits according to IEC This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturer s operating instructions. Caution, risk of electrical shock When operating the transducer, certain parts of the module can carry hazardous voltage (e.g. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious damage. This transducer is a build-in device, whose conducting parts must be inaccessible after installation. A protective housing or additional shield could be used. Main supply must be able to be disconnected. Remark Installation of the transducer must be done unless otherwise specified on the datasheet, according to LEM Transducer Generic Mounting Rules. Please refer to LEM document N ANE1254 available on our Web site: Products/Product Documentation. Definition of typical, minimum and maximum values Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shown in typical graphs. On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower limits and a probability for measured values to lie within this interval. Unless otherwise stated (e.g. 1 % tested ), the LEM definition for such intervals designated with min and max is that the probability for values of samples to lie in this interval is %. For a normal (Gaussian) distribution, this corresponds to an interval between 3 sigma and +3 sigma. If typical values are not obviously mean or average values, those values are defined to delimit intervals with a probability of %, corresponding to an interval between sigma and +sigma for a normal distribution. Typical, maximal and minimal values are determined during the initial characterization of the product. Page 18/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

19 Dimensions (in mm) Connection +U C Page 19/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

20 Packaging information Standard delivery in cardboard: L W H: mm Each carboard contains 2 parts, placed into 4 Polystyrene-made trays of 5 parts each one. Both trays and carboard are ESD-compliant. The typical weight of the cardboard is 2.5 Kg. 5 transducers per tray Page 2/2 2August217/Version 2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice