Current Transducer LA 25-NP/SP8 For the electronic measurement of currents: DC, AC, pulsed..., with galvanic isolation between the primary circuit and the secondary circuit. IPN = 2 A 16094 Features Electrical data IPN IPM RM Primary nominal current rms Primary current, measuring range Measuring resistance with ± 15 V @ ± 2 A max @ ± 3 A max ISN Secondary nominal current rms KN Conversion ratio VC Supply voltage (± 5 %) IC Current consumption 2 0 .. ± 3 RM min RM max 100 320 100 190 24 12 : 1000 ± 15 10 + IS A A Ω Ω mA V mA Accuracy - Dynamic performance data X ε L IO IOM IOT tr di/dt BW Accuracy @ IPN, TA = 25°C Linearity error Offset current 1) @ IP = 0, TA = 25°C Magnetic offset current 2) @ IP = 0 and specified RM, after an overload of 3 x IPN Temperature variation of IO 0°C .. + 25°C + 25°C .. + 70°C Response time 3) to 90 % of IPN step di/dt accurately followed Frequency bandwidth (- 1 dB) Ambient operating temperature Ambient storage temperature Primary coil resistance @ TA = 25°C Secondary coil resistance @ TA = 70°C Insertion inductance Isolation resistance @ 500 V, TA = 25°C Mass Standards Special features ●● IPN = 2 A ●● IPM = 0 .. ± 3 A ●● KN = 12 : 1000. Advantages ± 0.5 < 0.2 Typ Max ± 0.05 ± 0.15 % % mA ± 0.05 ± 0.15 ± 0.06 ± 0.25 ± 0.10 ± 0.35 < 1 > 50 DC .. 150 mA mA mA µs A/µs kHz General data TA TS RP RS LP RIS m ●● Closed loop (compensated) current transducer using the Hall effect ●● Isolated plastic case recognized according to UL 94-V0. 0 .. + 70 - 25 .. + 85 < 12.4 110 8 > 1500 22 EN 50178: 1997 °C °C mΩ Ω µH MΩ g ●● ●● ●● ●● ●● ●● ●● 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 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. ●● Industrial. Page 1/3 9November2011/version 3 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/SP8 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 16 Min 19.5 19.5 175 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 dCp, dCI, Vw EN 50178 IEC 61010-1 Rated insulation voltage Nominal voltage Basic insulation 1700 V 1700 V Reinforced insulation 600 V 600 V 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 3 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/SP8 (in mm) Connection Mechanical characteristics ●● General tolerance ●● Fastening & connection of primary ●● Fastening & connection of secondary ●● Recommended PCB hole Remark ± 0.2 mm 2 pins 0.635 x 0.635 mm 3 pins Ø 1 mm 1.2 mm ●● IS is positive when IP flows from terminal + to terminal -. Page 3/3 9November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com