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| Current Transducer LF 305-S 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 = 300 A Preliminary Electrical data IPN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance with 12 V with 15 V with 20 V ISN KN VC IC Vd @ 300 A max @ 500 A max @ 300 A max @ 500 A max @ 300 A max @ 500 A max 300 0 .. 500 RM min RM max 0 0 0 0 15 15 39 12 58 22 93 45 A A Features * Closed loop (compensated) current * Insulated plastic case recognized according to UL 94-V0. transducer using the Hall effect 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. 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 150 mA 1 : 2000 12 .. 20 V 16 (@ 20 V) + IS mA 3 kV Accuracy - Dynamic performance data XG L Overall accuracy @ IPN , TA = 25C Linearity Offset current @ IP = 0, TA = 25C Residual current 1) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO - 10C .. + 70C Reaction time @ 10 % of IPN Response time 2) @ 90 % of IPN di/dt accurately followed Frequency bandwidth (- 1 dB) 0.4 < 0.1 Max 0.20 0.08 0.1 0.30 < 500 <1 > 100 DC .. 100 Typ % % mA mA mA ns s A/s kHz Applications * AC variable speed drives and servo * Static converters for DC motor drives * Battery supplied applications * Uninterruptible Power Supplies * Switched Mode Power Supplies * Power supplies for welding (SMPS) applications. (UPS) motor drives IO IOM IOT tra tr di/dt f General data TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance @ TA = 70C Mass Standards 3) - 10 .. + 70 - 25 .. + 85 28 95 EN 50178 C C g Notes : 1) 2) 3) The result of the coercive field of the magnetic circuit With a di/dt of 100 A/s A list of corresponding tests is available 991125/1 LEM Components w w w .lem.com Dimensions LF 305-S Bottom view (in mm. 1 mm = 0.0394 inch) 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 * * * * General tolerance Fastening Primary through-hole Connection of secondary 0.5 mm see drawing 20 mm Molex 5045-03/AG Remarks * IS is positive when IP flows in the direction of the arrow. * Temperature of the primary conductor should not exceed * Dynamic performances (di/dt and response time) are best * This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. with a single bar completely filling the primary hole. 100C. LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice. |
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