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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 Electrical data IPN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance @ with 12 V with 15 V ISN KN VC IC Vd @ 50 A max @ 70 A max @ 50 A max @ 70 A max 50 0 .. 70 TA = 70C TA = 85C RM min RM max RM min RM max 10 10 50 50 100 50 160 90 60 95 60 1) 60 1) 135 155 135 2) 135 2) A A Features *Closed loop (compensated) current transducer using the Hall effect *Printed circuit board mounting *Insulated plastic case recognized according to UL 94-V0. Secondary nominal r.m.s. current Conversion ratio Supply voltage ( 5 %) Current consumption R.m.s. voltage for AC isolation test, 50 Hz, 1 mn 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 Accuracy - Dynamic performance data X Accuracy @ IPN , TA = 25C L @ 15 V ( 5 %) @ 12 .. 15 V ( 5 %) Linearity Offset current @ IP = 0, TA = 25C Residual current 3) @ IP = 0, after an overload of 3 x I PN Thermal drift of IO 0C .. + 70C - 25C .. + 85C Reaction time @ 10 % of IP max Response time @ 90 % of IP max di/dt accurately followed Frequency bandwidth (- 1 dB) 0.65 0.90 < 0.15 Typ Max 0.2 0.3 0.5 0.6 % % % mA mA mA mA ns s A/s kHz *Current overload capability. IO IOM IOT tra tr di/dt f 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) General data TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance @ Mass Standards - 25 .. + 85 - 40 .. + 90 80 85 18 EN 50178 C C g *Power supplies for welding applications. TA = 70C TA = 85C 4) Notes : 1) 2) 3) 4) Measuring range limited to 60 A max Measuring range limited to 55 A max Result of the coercive field of the magnetic circuit A list of corresponding tests is available 980706/8 LEM Components w w w .lem.com Dimensions LA 55-P Bottom view (in mm. 1 mm = 0.0394 inch) Left view Secondary terminals swiss made Terminal + : supply voltage + 12 .. 15 V Terminal - : supply voltage - 12 .. 15 V Terminal M : measure Connection Standard 00 or N SP.. Year Week 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 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. LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. |
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