LA55-P

Current Transducer LA 55-P For the electronic measurement of currents: DC, AC, pulsed..., with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). IPN = 50 A 16019 Electrical data IPN Primary nominal current rms 50 A IPM Primary current, measuring range 0 .. ± 70 A R M Measuring resistance TA = 70°C TA = 85°C RM min RM max RM min RM max with ± 12 V @ ± 50 A max 10 100 60 95 Ω @ ± 70 A max 10 50 60 1) 60 1) Ω with ± 15 V @ ± 50 A max 50 160 135 155 Ω @ ± 70 A max 50 90 135 2) 135 2) Ω ISN Secondary nominal current rms 50 mA K N Conversion ratio 1 : 1000 VC Supply voltage (± 5 %) ± 12 .. 15 V IC Current consumption 10 (@ ± 15 V) + IS mA Accuracy - Dynamic performance data X ε L IO IOM IOT tra t r di/dt BW Accuracy @ IPN , TA = 25°C @ ± 15 V (± 5 %) ± 0.65 @ ± 12 .. 15 V (± 5 %) ± 0.90 Linearity error < 0.15 Typ Max Offset current @ IP = 0, TA = 25°C ± 0.2 Magnetic offset current 3) @ IP = 0 and specified RM, after an overload of 3 x IPN ± 0.3 Temperature variation of IO - 25°C .. + 85°C ± 0.1 ± 0.6 - 40°C .. - 25°C ± 0.2 ± 1.0 Reaction time to 10 % of IPN step < 500 Response time to 90 % of IPN step < 1 di/dt accurately followed > 200 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 Secondary coil resistance @ TA = 70°C @ TA = 85°C Mass Standards - 40 .. + 85 °C - 40 .. + 90 °C 80 Ω 85 Ω 18 g EN 50178: 1997 Features ●● Closed loop (compensated) current transducer using the Hall effect ●● Printed circuit board mounting ●● 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) Measuring range limited to ± 60 A max 2) Measuring range limited to ± 55 A max 3) Result of the coercive field of the magnetic circuit. 090519/14 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. Page 1/3 www.lem.com Current Transducer LA 55-P Isolation characteristics Vd Vw dCp dCI CTI Rms voltage for AC isolation test, 50 Hz, 1 min Impulse withstand voltage 1.2/50 µs Creepage distance Clearance distance Comparative Tracking Index (group IIIa) 2.5 5.7 Min 5 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 EN 50178 IEC 61010-1 Rated isolation voltage Nominal voltage Single isolation 500 V 500 V Reinforced isolation 250 V 250 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 090519/14 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. www.lem.com Dimensions LA 55-P (in mm. 1 mm = 0.0394 inch) Front view Connection Top view Left view Mechanical characteristics ●● General tolerance ●● Primary through-hole ●● Fastening & connection of secondary ●● Recommended PCB hole Remarks ± 0.2 mm 12.7 x 7 mm 3 pins 0.63 x 0.56 mm 0.9 mm ●● IS is positive when IP flows in the direction of the arrow. ●● Temperature of the primary conductor should not exceed 90°C. ●● 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 090519/14 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. www.lem.com