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| Current Transducer LA 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 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 Vb @ 300 A max @ 500 A max @ 300 A max @ 500 A max 300 0 .. 500 TA = 70C TA = 85C RM min RM max RM min RM max 0 0 0 0 52 17 75 31 0 0 5 5 50 15 73 29 A A Features *Closed loop (compensated) current transducer using the Hall effect *Insulated plastic case recognized according to UL 94-V0 *Copyright protected. Secondary nominal r.m.s. current Conversion ratio Supply voltage ( 5 %) Current consumption R.m.s. rated voltage 1), safe separation basic isolation 120 mA 1 : 2500 12 .. 15 V 20 (@ 15 V) + IS mA 1750 V 3500 V Advantages *Excellent accuracy *Very good linearity *Low temperature drift *Optimized response time *Wide frequency bandwidth *No insertion losses *High immunity to external interference Accuracy - Dynamic performance data XG L Overall accuracy @ IPN , TA = 25C Linearity 0.8 < 0.1 Max 0.20 0.40 0.30 % % mA mA mA ns s A/s kHz *Current overload capability. IO IOM IOT tra tr di/dt f Typ Offset current @ IP = 0, TA = 25C Residual current 2) @ IP = 0, after an overload of 3 x IPN Thermal drift of IO - 10C .. + 85C 0.12 Reaction time @ 10 % of IP max Response time 3) @ 90 % of IP max di/dt accurately followed Frequency bandwidth (- 3 dB) Applications *AC variable speed drives and servo motor drives < 500 <1 > 100 DC .. 100 *Static converters for DC motor drives *Battery supplied applications *Uninterruptible Power Supplies (UPS) *Switched Mode Power Supplies General data TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance @ Mass Standards - 10 .. + 85 - 40 .. + 90 35 37 200 EN 50178 C C g (SMPS) *Power supplies for welding applications. TA = 70C TA = 85C 4) Notes : 1) 2) 3) 4) Pollution class 2. With a non insulated primary bar which fills the through-hole 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 980707/6 LEM Components w w w .lem.com Dimensions LA 305-S Front view (in mm. 1 mm = 0.0394 inch) Left view Secondary terminals Pin Pin Pin Pin 1 2 3 4 : : : : supply voltage + 12 .. 15 V measure supply voltage - 12 .. 15 V NC Connection Top view Mechanical characteristics *General tolerance *Fastening *Primary through-hole *Connection of secondary 0.5 mm 2 holes 5.5 mm 25.5 x 25.5 mm Molex 5046-04/AG Remarks *IS is positive when IP flows in the direction of the arrow. *Temperature of the primary conductor should not exceed 100C. *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. |
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