Unipolar voltage - Current output 4-20 ma Ref: DVL 50-UI, DVL 150-UI, DVL 250-UI, DVL 500-UI, DVL 750-UI, DVL 1000-UI, DVL 1500-UI
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- Amice Wilson
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1 Current Transducer DVL-UI series V PN = V Unipolar voltage - Current output 4-0 ma Ref: DVL 50-UI, DVL 150-UI, DVL 50-UI, DVL 500-UI, DVL 750-UI, DVL 1000-UI, DVL 1500-UI For the electronic measurement of voltage: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit. Features Unipolar and insulated measurement up to 1500 V 4-0 ma output Input and output connections with M5 studs Compatible with AV 100 family. Advantages Low consumption and low losses Compact design Good behavior under common mode variations Excellent accuracy (offset, sensitivity, linearity) Good response time Low temperature drift High immunity to external interferences. Applications Substations Trackside. Standards EN 50155: 007 EN 50178: 1997 EN : 001 EN : 006 UL 508: 013. Application Domains Traction (fixed and onboard) Industrial. N 97.M , 97.M , 97.M , 97.M , 97.M , 97.M , 97.M Page 1/9
2 Absolute maximum ratings Parameter Symbol Unit Value Maximum supply voltage (V P = 0 V, 0.1 s) ±U C V ±34 Maximum supply voltage (working) ( C) ±U C V ±6.4 Absolute maximum ratings apply at 5 C unless otherwise noted. Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. UL 508: Ratings and assumptions of certification File # E Volume: Section: 7 Standards USR indicated investigation to the Standard for Industrial Control Equipment UL 508. CNR Indicated investigation to the Canadian standard for Industrial Control Equipment CSA C. No Conditions of acceptability When installed in the end-use equipment, consideration shall be given to the following: Marking 1 - These devices must be mounted in a suitable end-use enclosure. - The terminal have not been evaluated for field wiring. 3 - Low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as 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). 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 /9
3 Insulation coordination Parameter Symbol Unit Value Comment Rms voltage for AC insulation test, 50 Hz, 1 min U d kv % tested in production Impulse withstand voltage 1./50 µs Û W kv 16 Partial discharge extinction rms 10 pc U e V 700 Insulation resistance R IS MΩ 00 measured at 500 V DC Clearance (pri. - sec.) d CI mm Creepage distance (pri. - sec.) d Cp mm Case material - - See dimensions drawing on page 8 V0 according to UL 94 Comparative tracking index CTI Shortest distance through air Shortest path along device body Maximum DC common mode voltage V HV+ + V HVand V HV+ - V HV- kv 4. V PM Environmental and mechanical characteristics Parameter Symbol Unit Min Typ Max Ambient operating temperature T A C Ambient storage temperature T S C Mass m g 90 Page 3/9
4 Electrical data At T A = 5 C, ±U C = ±4 V, R M = 100 Ω, unless otherwise noted. Lines with a * in the conditions column apply over the C ambient temperature range. Parameter Symbol Unit Min Typ Max Conditions Primary nominal DC voltage V PN V Measuring resistance R M Ω * Secondary nominal DC current N ma 4 0 * Maximum secondary DC current ma 3 1 See figure Supply voltage ±U C V ±13.5 ±4 ±6.4 * Rise time of U C (10-90 %) t rise ms 100 Current U C = ±4 V at V P = 0 V I C ma 5 30 DVL 50-UI DVL 150-UI DVL 50-UI DVL 500-UI DVL 750-UI DVL 1000-UI DVL 1500-UI Max value of R M is given on figure 1 Offset current I O µa % tested in production Temperature variation of I O I OT µa Sensitivity error ε G % Thermal drift of sensitivity ε GT % * Linearity error ε L % of V PN * Overall accuracy X G % of V PN * 5 85 C C 5 C; 100 % tested in production C Output rms noise current I no µa 10 1 Hz to 100 khz Reaction 10 % of V PN t ra µs 30 Response 90 % of V PN t r µs kv/µs Frequency bandwidth BW khz Start-up time t start ms * Primary resistance R 1 MΩ * 3 db 1 db 0.1 db For V PN > 500 V For V PN 500 V 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. 100 % 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 68.7 %, corresponding to an interval between sigma and +sigma for a normal distribution. Typical, minimum and maximum values are determined during the initial characterization of the product. Page 4/9
5 Typical performance characteristics Maximum measuring resistance (Ohm) T A = C U C = ±13.5 to ±6.4 V Output Current [ma] Input Voltage (% of V PN ) Input voltage ( V) Figure 1: Maximum measuring resistance Figure : Output secondary current (DVL 50-UI) Electrical offset drift (ua) Max Typical Min Overall accuracy (% V PN ) Max Mean Min Ambient temperature ( C) Ambient temperature ( C) Figure 3: Electrical offset thermal drift Figure 4: Overall accuracy in temperature Sensitivity drift (% V PN ) Max Typical Min Ambient temperature ( C) Output : 4 ma to 0 ma Timebase: 0 µs/div Figure 5: Sensitivity thermal drift Figure 6: Typical step response (0 to V PN ) Page 5/9
6 Typical performance characteristics Typical supply current (ma) Supply voltage ( V) Ineg. Ipos. T A = 5 C, V P = 0 V Input V P : 500 V/div Output : 500 µa/div Timebase: 0 µs/div Figure 7: Supply current function of supply voltage Figure 8: Detail of typical common mode perturbation (1000 V step with 6 kv/µs, R M = 100 Ω) Gain (db) Frequency (khz) Phase (deg) Frequency (khz) Figure 9: Typical frequency and phase response Page 6/9
7 Typical performance characteristics e no (dbvrms/hz 1/ ) Frequency (khz) I no (A rms) 1E-4 1E-5 1E-6 1E-7 1E Frequency (khz) Figure 10: Typical noise voltage spectral density e no with R M = 50 Ω Figure 11: Typical total output rms noise current with R M = 50 Ω Figure 10 (noise voltage spectral density) shows that there are no significant discrete frequencies in the output. Figure 11 confirms the absence of steps in the total output current noise that would indicate discrete frequencies. To calculate the noise in a frequency band f1 to f, the formula is: I no(f1 to f) = I no(f) I no(f1) with I no (f) read from figure 11 (typical, rms value). Example: What is the noise from 10 to 100 Hz? Figure 11 gives I no (10 Hz) = 0.6 µa and I no (100 Hz) = 0.8 µa. The output rms current noise is therefore. ( ) ( ) = 0.76 µα Page 7/9
8 Performance parameters definition The schematic used to measure all electrical parameters are: VP +HV -HV Isolation barrier Figure 1: Standard characterization schematics for current output transducers (R M = 50 Ω unless otherwise noted) Transducer simplified model The static model of the transducer at temperature T A is: = G V P + ε In which ε = I OE + I OT (T A ) + ε G G V P + ε GT (T A ) G V P + ε L G V PM : secondary current (A) G: sensitivity of the transducer (A/V) V P : primary voltage (V) V PM : primary voltage, measuring range (V) T A : ambient operating temperature ( C) I OE : electrical offset current (A) I OT (T A ): temperature variation of I O at temperature T A (A) ε G : sensitivity error at 5 C ε GT (T A ): thermal drift of sensitivity at temperature T A ε L : linearity error This is the absolute maximum error. As all errors are independent, a more realistic way to calculate the error would be to use the following formula: ε = N ii =1 + - ε ii M R M +UC 0 V -UC Sensitivity and linearity To measure sensitivity and linearity, the primary voltage (DC) is cycled from 0 to V PM, then to V PM and back to 0 (equally spaced V PM /10 steps). The sensitivity G is defined as the slope of the linear regression line for a cycle between ±V PM. The linearity error ε L is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of the maximum measured value. Electrical offset The electrical offset current I OE is the residual output current when the input voltage is zero. The temperature variation I OT of the electrical offset current I OE is the variation of the electrical offset from 5 C to the considered temperature. Overall accuracy The overall accuracy X G is the error at ±V PN, relative to the rated value V PN. It includes all errors mentionned above. Response and reaction times The response time t r and the reaction time t ra are shown in the next figure. Both depend on the primary voltage dv/dt. They are measured at nominal voltage. 100 % 90 % I P 10 % I t ra Figure 13: Response time t r and reaction time t ra t r t Page 8/9
9 Dimensions (in mm) d CI d Cp Connection U C R M U C Mechanical characteristics General tolerance Transducer fastening Recommended fastening torque Connection of primary Recommended fastening torque Connection of secondary Recommended fastening torque Remarks ±1 mm holes 6.5 mm M6 steel screws 4 N m M5 threaded studs. N m 3 M5 threaded studs. N m The transducer is directly connected to the primary voltage. The primary cables have to be routed together all the way. The secondary cables also have to be routed together all the way. Installation of the transducer is to be done without primary or secondary voltage present. 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 ANE10504 available on our Web site: Products/ Product Documentation. This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. 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 (eg. primary connection, 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. Page 9/9
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