LA25-P

Current Transducer LA 25-P For the electronic measurement of currents: DC, AC, pulsed..., with galvanic separation between the primary circuit and the secondary circuit. IPN = 25 A Electrical data IPN Primary nominal rms current 25 A IPM Primary current, measuring range 0 .. ± 55 A R M Measuring resistance TA = 70 °C TA = 85 °C RM min RM max RM min RM max with ± 12 V @ ± 25 A max 10 280 60 275 Ω @ ± 55 A max 10 80 60 75 Ω with ± 15 V @ ± 25 A max 50 400 135 395 Ω @ ± 55 A max 50 140 135 135 Ω ISN Secondary nominal rms current 25 mA K N Conversion ratio 1 : 1000 U C Supply voltage (± 5 %) ± 12 .. 15 V IC Current consumption 10 (@ ± 15 V) + IS mA Accuracy - Dynamic performance data X Accuracy @ IPN, TA = 25 °C @ ± 15 V (± 5 %) ± 0.95 @ ± 12 .. 15 V (± 5 %) ± 1.25 εL Linearity error < 0.15 Typ Max IO Offset current @ IP = 0, TA = 25 °C ± 0.2 IOM Magnetic offset current 1) @ IP = 0 and specified RM, after an overload of 3 × IPN ± 0.3 IOT Temperature variation of IO 0 °C .. + 70 °C ± 0.1 ± 0.5 - 25 °C .. + 85 °C ± 0.1 ± 0.6 tra Reaction time < 500 tr Step response time to 90 % of IPN < 1 di/dt di/dt accurately followed > 200 BW Frequency bandwidth (- 1 dB) DC .. 200 % % % mA mA mA mA ns µs A/µs kHz General data TA TS RS m Ambient operating temperature Ambient storage temperature Resistance of secondary winding @ TA = 70 °C @ TA = 85 °C Mass Standard - 25 .. + 85 °C - 40 .. + 90 °C 80 Ω 85 Ω 24 g EN 50178: 1997 Features ●● Closed loop (compensated) current transducer using the Hall effect ●● Insulating 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. Note: 1) Result of the coercive field of the magnetic circuit. N° 97.13.19.000.0 13November2014/version 3 Page 1/3 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-P Insulation coordination U d ÛW dCp dCI CTI Rms voltage for AC insulation test, 50 Hz, 1 min 3 Impulse withstand voltage 1.2/50 µs 5.7 Min Creepage distance 5 Clearance 5 Comparative tracking index (group I) 600 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, ÛW EN 50178 IEC 61010-1 Rated insulation voltage Nominal voltage Basic insulation 500 V 500 V Reinforced insulation 250 V 250 V Safety This transducer must be used in limited-energy secondary circuits according to IEC 61010-1. 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 13November2014/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-P (in mm) dCl dCp Connection IP IS RM UC UC dCl IP dCl Mechanical characteristics ●● General tolerance ●● Primary through-hole ●● Fastening & connection of secondary ●● Recommended PCB hole Remarks ± 0.2 mm 12.7 × 7 mm 3 pins 0.6 × 0.7 mm ⌀ 1.2 mm dCp IP IS RM ●● IS is positive when IP flows in the direction of the arrow. UC ●● Temperature of the primary conductor should not exceed 90 °C. U C ●● 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°ANE120504 available on our Web site: Products/Product Documentation. ●● Dynamic performances (di/dt and response time) are best with a single bar completely filling the primary hole. ●● In order to achieve the best magnetic coupling, the primary windings have to be wound over the top edge of the device. ●● This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. Page 3/3 13November2014/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com