Current Transducer LF 305-S I = 300 A PN For the electronic measurement of currents: DC, AC, pulsed..., with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). 16167 Features Closed loop (compensated) Electrical data current transducer using the Hall I Primary nominal current rms 300 A effect PN I Primary current, measuring range 0 .. 500 A Isolated plastic case recognized PM R Measuring resistance T = 70C T = 85C according to UL 94-V0. M A A R R R R M min M max M min M max Advantages with 12 V 300 A 0 37 0 35 max 500 A 0 10 0 8 max Excellent accuracy with 15 V 300 A 0 56 0 54 max Very good linearity 500 A 0 21 0 19 max Low temperature drift with 20 V 300 A 0 88 0 86 max Optimized response time 500 A 0 40 0 38 max Wide frequency bandwidth I Secondary nominal current rms 150 mA SN No insertion losses K Conversion ratio 1 : 2000 N High immunity to external V Supply voltage ( 5 %) 12 .. 20 V C interference I Current consumption 26 ( 20V)+ I mA C S Current overload capability. Applications Accuracy - Dynamic performance data AC variable speed drives and X Overall accuracy I , T = 25C 0.5 % G PN A servo motor drives Linearity error < 0.1 % L Static converters for DC motor Typ Max drives I Offset current I = 0, T = 25C 0.2 mA O P A Battery supplied applications 1) I Magnetic offset current I =0 and specified R OM P M Uninterruptible Power Supplies after an overload of 3 x I 0.2 mA PN (UPS) I Temperature variation of I - 40C .. + 85C 0.2 0.7 mA OT O Switched Mode Power Supplies - 10C .. + 70C 0.1 0.3 mA (SMPS) t Reaction time to 10 % of I < 500 ns ra PN Power supplies for welding 2) t Response time to 90 % of I step < 1 s r PN applications. di/dt di/dt accurately followed > 100 A/s BW Frequency bandwidth (- 1 dB) DC .. 100 kHz Application domains Industrial. General data T Ambient operating temperature - 40 .. + 85 C A T Ambient storage temperature - 40 .. + 85 C S R Secondary coil resistance T = 70C 30 S A T = 85C 32 A m Mass 95 g Standards EN 50178:1997 1) Notes: The result of the coercive field of the magnetic circuit 2) With a di/dt of 100 A/s. Page 1/3 110210/11 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. www.lem.comCurrent Transducer LF 305-S Isolation characteristics V Rms voltage for AC isolation test, 50 Hz, 1 min 3.8 kV d V Impulse withstand voltage 1.2/50 s 10 kV w Min dCp Creepage distance 11.9 mm dCI Clearance distance 11.5 mm CTI Comparative Tracking Index (group IIIa) 175 Applications examples According to EN 50178 and IEC 61010-1 standards and following conditions: Over voltage category OV 2 Pollution degree PD2 Non-uniform field EN 50178 IEC 61010-1 dCp, dCI, Rated insulation voltage Nominal voltage V w Basic insulation 1000 V 1000 V Reinforced insulation 500 V 500 V Safety This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturers operating instructions. Caution, risk of electrical shock When operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious damage. This transducer is a build-in device, whose conducting parts must be inaccessible after installation. A protective housing or additional shield could be used. Main supply must be able to be disconnected. Page 2/3 110210/11 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. www.lem.com