Current Transducer LA 55-P/SP1 IPN = 50 A 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). 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 0 .. 100 TA = 70C TA = 85C RM min RM max RM min RM max @ 50 A max @ 100 A max @ 50 A max @ 100 A max 0 0 0 0 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 215 35 335 95 0 0 30 30 210 30 330 90 A A *Closed loop (compensated) current transducer using the Hall effect 25 mA 1 : 2000 12 .. 15 V 10 (@ 15 V) + IS mA 2.5 kV Accuracy - Dynamic performance data X Accuracy @ IPN , TA = 25C @ 15 V ( 5 %) @ 12 .. 15 V ( 5 %) Linearity L 0.65 0.90 < 0.15 IO I OM IOT Typ Offset current @ IP = 0, TA = 25C Residual current 1) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO 0C .. + 70C 0.05 - 25C .. + 85C 0.05 tra tr di/dt f Reaction time @ 10 % of IP max Response time 2) @ 90 % of IP max di/dt accurately followed Frequency bandwidth (- 1 dB) % % % Max 0.10 0.15 0.25 0.30 < 500 <1 > 200 DC .. 200 mA mA mA mA ns s A/s kHz General data TA TS RS m Notes : Ambient operating temperature Ambient storage temperature Secondary coil resistance @ Mass Standards 1) 2) 3) TA = 70C TA = 85C 3) - 25 .. + 85 - 40 .. + 90 145 150 18 EN 50178 Features C C g *Printed circuit board mounting *Insulated plastic case recognized according to UL 94-V0. Special features *IP = 0 .. 100 A *K N = 1 : 2000. 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. Result of the coercive field of the magnetic circuit With a di/dt of 100 A/s A list of corresponding tests is available 981130/9 LEM Components w w w .lem.com Dimensions LA 55-P/SP1 (in mm. 1 mm = 0.0394 inch) Bottom view 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 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 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. LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.