IPN = Current Transducer LA 125-P 125 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). 16030 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 125 0 .. ± 200 TA = 70°C TA = 85°C RM min RM max RM min RM max @ ± 125 A max @ ± 200 A max @ ± 125 A max @ ± 200 A max 5 5 25 25 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 52 20 74 34 14 14 40 40 1) 50 18 72 40 1) A A ε Accuracy @ IPN , TA = 25°C @ ± 15 V (± 5 %) @ ± 12 .. 15 V (± 5 %) Ω Ω Ω Ω 125 mA 1 : 1000 ± 12 .. 15 V 16 (@ ± 15 V) + IS m A 3 kV Linearity error L ± 0.60 ± 0.80 < 0.15 Typ Offset current @ IP = 0, TA = 25°C Residual current 2) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO 0°C .. + 70°C ± 0.15 - 40°C .. + 85°C ± 0.30 IO IOM IOT tra tr di/dt f Reaction time @ 10 % of IPN Response time 3) 4) @ 90 % of IPN di/dt accurately followed 4) Frequency bandwidth 4) (- 1 dB) % % % Max ± 0.40 ± 0.50 ± 0.50 ± 0.95 < 500 <1 > 200 DC .. 100 mA mA mA mA ns µs A/µs kHz TA TS RS Ambient operating temperature Ambient storage temperature Secondary coil resistance @ m Mass Standards 1) 2) 3) 4) • Printed circuit board mounting • Insulated 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) General data Notes : • Closed loop (compensated) current transducer using the Hall effect Accuracy - Dynamic performance data X Features TA = 70°C TA = 85°C - 40 .. + 85 °C - 40 .. + 90 °C 32 Ω 33.5 Ω 40 g EN 50178 : 1997 • Power supplies for welding applications. Measuring range limited to ± 180 A max The result of the coercive field of the magnetic circuit. With a di/dt of 100 A/µs The primary conductor is best filling the through-hole and/or the return of the primary conductor is above the top of the transducer. 060213/10 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. LEM page 1/2 w w w .lem.com Dimensions LA 125-P (in mm. 1 mm = 0.0394 inch) Bottom view Left view Model + SP N° Date Code Connection Front view Mechanical characteristics Remarks • General tolerance ± 0.2 mm • Primary through-hole 17 x 11 mm • Fastening & connection of secondary 4 pins 0.63 x 0.56 mm • IS is positive when IP flows in the direction of the arrow. • Temperature of the primary conductor should not exceed Recommended PCB hole • Supplementary fastening Recommended PCB hole Recommended screws Fastening torque, max. 0.9 mm 2 holes ∅ 1.75 mm 2.4 mm PT K A 22 x 6 0.5 Nm or .37 Lb. - Ft. 90°C. • Dynamic performances (di/dt and response time) are best with a primary bar in low position in the through-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. 060213/10 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. LEM page 2/2 w w w .lem.com