LA 25-NP

Current Transducer LA 25-NP For the electronic measurement of currents: DC, AC, pulsed..., with galvanic isolation between the primary circuit and the secondary circuit. IPN = 5-6-8-12-25 At 16080 Features Electrical data IPN Primary nominal current rms IPM Primary current, measuring range RM Measuring resistance @ with ± 15 V @ ± 25 At max @ ± 36 At max ISN Secondary nominal current rms K N Conversion ratio VC Supply voltage (± 5 %) IC Current consumption 25 At 0 .. ± 36 At TA = 70°C TA = 85°C RM min RM max RM min RM max 100 320 100 315 Ω 100 190 100 185 Ω 25 mA 1-2-3-4-5 : 1000 ± 15 V 10 + IS mA Accuracy - Dynamic performance data X ε L IO IOM IOT t r di/dt BW Accuracy @ IPN, TA = 25°C ± 0.5 % Linearity error < 0.2 % Typ Max Offset current 1) @ IP = 0, TA = 25°C ± 0.05 ± 0.15 mA Magnetic offset current 2) @ IP = 0 and specified RM, after an overload of 3 x IPN ± 0.05 ± 0.15 mA Temperature variation of IO 0°C .. + 25°C ± 0.06 ± 0.25 mA + 25°C .. + 70°C ± 0.10 ± 0.35 mA - 25°C .. + 85°C ± 0.5 mA - 40°C .. + 85°C ± 1.2 mA Response time 3) to 90 % of IPN step < 1 µs di/dt accurately followed > 50 A/µs Frequency bandwidth (- 1 dB) DC .. 150 kHz General data TA TS RP RS RIS m Ambient operating temperature Ambient storage temperature Primary coil resistance per turn @ TA = 25°C Secondary coil resistance @ TA = 70°C @ TA = 85°C Isolation resistance @ 500 V, TA = 25°C Mass Standards - 40 .. + 85 - 45 .. + 90 < 1.25 110 115 > 1500 22 EN 50178: 1997 °C °C mΩ Ω Ω MΩ g ●● Closed loop (compensated) current transducer using the Hall effect ●● Isolated plastic case recognized according to UL 94-V0. Advantages ●● ●● ●● ●● ●● ●● ●● Excellent accuracy Very good linearity Low temperature drift Optimized response time Wide frequency bandwidth No insertion losses High immunity to external interference ●● Current overload capability. Applications ●● AC variable speed drives 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. Application domain ●● Industrial. Notes: 1) Measurement carried out after 15 mn functioning 2) The result of the coercive field of the magnetic circuit 3) With a di/dt of 100 A/µs. Page 1/3 9November2011/version 14 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com Current Transducer LA 25-NP Isolation characteristics Vd Vw dCp dCI CTI Rms voltage for AC insulation test, 50 Hz, 1 min Impulse withstand voltage 1.2/50 µs Creepage distance Clearance Comparative Tracking Index (group IIIa) 2.5 9 Min 10.63 10.63 175 kV kV mm mm Applications examples According to EN 50178 and IEC 61010-1 standards and following conditions: ●● Over voltage category OV 3 ●● Pollution degree PD2 ●● Non-uniform field EN 50178 IEC 61010-1 Rated insulation voltage Nominal voltage Basic insulation 1700 V 1700 V Reinforced insulation 600 V 600 V dCp, dCI, Vw Safety 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 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. Page 2/3 9November2011/version 14 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com Dimensions LA 25-NP (in mm) Connection Number of primary turns 1 Primary current nominal IPN [A] 25 Nominal output current maximum I [mA] SN IP [A] 36 25 Turns ratio KN 1 / 1000 Primary resistance RP [mΩ] 0.3 Primary insertion inductance LP [µH] Recommended connections 12 18 24 2 / 1000 1.1 8 12 24 3 / 1000 2.5 6 9 24 4 / 1000 4.4 5 7 25 5 / 1000 6.3 9November2011/version 14 7 8 9 10 5 4 3 2 1 IN 6 7 8 9 10 5 4 3 2 1 6 7 8 9 10 5 4 3 2 1 IN IN 6 7 8 9 10 5 4 3 2 1 6 7 8 9 10 IN Remarks Mechanical characteristics General tolerance Fastening & connection of primary Fastening & connection of secondary Recommended PCB hole 6 IN 0.58 OUT ●● ●● ●● ●● 1 0.37 OUT 5 2 0.21 OUT 4 3 0.09 OUT 3 4 0.023 OUT 2 5 ± 0.2 mm 10 pins 0.7 x 0.6 mm 3 pins Ø 1 mm 1.2 mm ●● IS is positive when IP flows from terminals 1, 2, 3, 4, 5 to terminals 10, 9, 8, 7, 6. ●● This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. Page 3/3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com