Current Transducer LF 305-S IPN = 300 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). Preliminary Electrical data Primary nominal r.m.s. current Primary current, measuring range Measuring resistance IPN IP RM with ± 12 V with ± 15 V with ± 20 V @ ± 300 A max @ ± 500 A max @ ± 300 A max @ ± 500 A max @ ± 300 A max @ ± 500 A max 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 ISN KN VC IC Vd 300 0 .. ± 500 RM min RM max A A 0 0 0 0 15 15 Ω Ω Ω Ω Ω Ω 39 12 58 22 93 45 150 mA 1 : 2000 ± 12 .. 20 V 16 (@ ± 20 V) + IS mA 3 kV Accuracy - Dynamic performance data Overall accuracy @ IPN , TA = 25°C Linearity XG ε L ± 0.4 < 0.1 IO IOM IOT Offset current @ IP = 0, TA = 25°C Residual current 1) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO - 10°C .. + 70°C Max ± 0.20 ± 0.08 ± 0.1 ± 0.30 tra tr di/dt f Reaction time @ 10 % of IPN Response time 2) @ 90 % of IPN di/dt accurately followed Frequency bandwidth (- 1 dB) < 500 <1 > 100 DC .. 100 % % Features • Closed loop (compensated) current transducer using the Hall effect • 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 Typ mA mA mA ns µs A/µs kHz • 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 General data TA TS RS m Notes : Ambient operating temperature Ambient storage temperature Secondary coil resistance @ TA = 70°C Mass Standards 3) 1) 2) 3) - 10 .. + 70 - 25 .. + 85 28 95 EN 50178 °C °C Ω g applications. The result of the coercive field of the magnetic circuit With a di/dt of 100 A/µs A list of corresponding tests is available 991125/1 LEM Components w w w .lem.com Dimensions LF 305-S (in mm. 1 mm = 0.0394 inch) Bottom view Secondary terminals Pin + : supply voltage + 12 .. 20 V Pin M : measure Pin - : supply voltage - 12 .. 20 V Right view Back view Connection Top view Mechanical characteristics Remarks • • • • • IS is positive when IP flows in the direction of the arrow. • Temperature of the primary conductor should not exceed General tolerance Fastening Primary through-hole Connection of secondary ± 0.5 mm see drawing ∅ 20 mm Molex 5045-03/AG 100°C. • Dynamic performances (di/dt and response time) are best with a single bar completely filling the primary hole. • 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.