Current Transducer LA 125-P IPN = 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). 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 = 70C TA = 85C 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 Accuracy @ IPN , TA = 25C Linearity L @ 15 V ( 5 %) @ 12 .. 15 V ( 5 %) 125 mA 1 : 1000 12 .. 15 V 16 (@ 15 V) + IS mA 3 kV 0.60 0.80 < 0.15 Typ Offset current @ IP = 0, TA = 25C Residual current 2) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO 0C .. + 70C 0.15 - 25C .. + 85C 0.15 IO I OM IOT tra tr di/dt f Reaction time @ 10 % of IP max Response time 3) 4) @ 90 % of IP max di/dt accurately followed 4) Frequency bandwidth 4) (- 1 dB) % % % Max 0.40 0.50 0.50 0.60 < 500 <1 > 200 DC .. 100 mA mA mA mA ns s A/s kHz Ambient operating temperature Ambient storage temperature Secondary coil resistance @ m Mass Standards Notes : 1) 2) 3) 4) 5) 5) TA = 70C TA = 85C - 25 .. + 85 - 40 .. + 90 32 33.5 40 EN 50178 C C g Measuring range limited to 180 A max The result of the coercive field of the magnetic circuit With a di/dt of 100 A/s The primary conductor is best filling the through-hole and/or the return of the primary conductor is above the top of the transducer A list of corresponding tests is available LEM Components *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 TA TS RS *Closed loop (compensated) current transducer using the Hall effect Accuracy - Dynamic performance data X Features *Power supplies for welding applications. 980716/5 w w w .lem.com Dimensions LA 125-P (in mm. 1 mm = 0.0394 inch) Bottom view Left view Standard 00 or N SP.. Year Week Secondary terminals Terminal - : supply voltage - 12 .. 15 V Terminal M : measure Terminal + : supply voltage + 12 .. 15 V Terminal : NC swiss made 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 LEM code 0.9 mm 2 holes 1.75 mm 2.4 mm K A 22 x 6 47.30.60.006.0 90C. *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. LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.