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| Current Transducer LA 55-P For the electronic measurement of currents : DC, AC, pulsed..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). IPN = 50 A 16019 Electrical data IPN IPM RM Primary nominal current rms Primary current, measuring range Measuring resistance @ with 12 V with 15 V ISN KN VC IC Vd @ 50 A maxi @ 70 A maxi @ 50 A maxi @ 70 A maxi 50 0 .. 70 TA = 70C TA = 85C RM mini RM maxi RM mini RM maxi 10 10 50 50 100 50 160 90 60 95 60 1) 601) 135 155 135 2) 135 2) A A Features * Closed loop (compensated) current transducer using the Hall effect * Printed circuit board mounting * Isolated plastic case recognized according to UL 94-V0. Secondary nominal current rms Conversion ratio Supply voltage ( 5 %) Current consumption Rms voltage for AC isolation test, 50 Hz, 1 min 50 mA 1 : 1000 12 .. 15 V 10 (@ 15 V) + IS mA 2.5 kV 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. Accuracy - Dynamic performance data X Accuracy @ IPN , TA = 25C L @ 15 V ( 5 %) @ 12 .. 15 V ( 5 %) Linearity error Offset current @ IP = 0, TA = 25C Magnetic offset current 3) @ IP = 0 and specified RM after an overload of 3 x I PN Temperature variation of IO 0C .. + 70C - 25C .. + 85C Reaction time @ 10 % of IPN Response time @ 90 % of IPN Step di/dt accurately followed Frequency bandwidth (- 1 dB) 0.65 0.90 < 0.15 Typ Maxi 0.2 0.3 0.5 0.6 % % % mA mA mA mA ns s A/s kHz IO IOM IOT tra tr di/dt BW Applications * AC variable speed drives and servo motor drives 0.1 0.1 < 500 <1 > 200 DC .. 200 * Static converters for DC motor drives * Battery supplied applications * Uninterruptible Power Supplies (UPS) * Switched Mode Power Supplies (SMPS) * Power supplies for welding General data TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance @ Mass Standards 1) 2) 3) applications. - 25 .. + 85 - 40 .. + 90 80 85 18 EN 50178: 1997 C C g Application Domain * Industrial. TA = 70C TA = 85C Notes: Measuring range limited to 60 A maxi Measuring range limited to 55 A maxi Result of the coercive field of the magnetic circuit. page 1/2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. 070103/11 w w w .lem.com Dimensions LA 55-P (in mm. 1 mm = 0.0394 inch) Left view Bottom view Model + N SP Connection Front view Mechanical characteristics * General tolerance * Primary through-hole * Fastening & connection of secondary Recommended PCB hole 0.2 mm 12.7 x 7 mm 3 pins 0.63 x 0.56mm 0.9 mm 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. Remarks * IS is positive when IP flows in the direction of the arrow. * Temperature of the primary conductor should not exceed 90C. * 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. 070103/11 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 built-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 2/2 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. w w w .lem.com |
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