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). 16167 Electrical data I PN IPM RM Primary nominal current rms Primary current, measuring range Measuring resistance with ± 12 V with ± 15 V with ± 20 V ISN KN VC IC 300 0 .. ± 500 RM mini RM maxi A A 0 0 0 0 15 15 Ω Ω Ω Ω Ω Ω @ ± 300 A max @ ± 500 A max @ ± 300 A max @ ± 500 A max @ ± 300 A max @ ± 500 A max Secondary nominal current rms Conversion ratio Supply voltage (± 5 %) Current consumption 39 12 58 22 93 45 150 mA 1 : 2000 ± 12 .. 20 V 26 (@ ±20V) + IS mA Accuracy - Dynamic performance data XG ε Overall accuracy @ IPN , T A = 25°C Linearity error L ± 0.4 < 0.1 Typ % % Maxi ± 0.20 mA IOT Offset current @ IP = 0, T A = 25°C Magnetic offset current 1) @ IP = 0 and specified RM, after an overload of 3 x IPN Temperature variation of IO - 10°C .. + 70°C ± 0.08 ± 0.1 ± 0.30 mA mA tra tr di/dt BW Reaction time @ 10 % of IPN Response time 2) to 90 % of IPN step di/dt accurately followed Frequency bandwidth (- 1 dB) < 500 <1 > 100 DC .. 100 IO I OM Features • Closed loop (compensated) current transducer using the Hall effect • Isolated 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 ns µs A/µs kHz 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: applications. Ambient operating temperature Ambient storage temperature Secondary coil resistance @ T A = 70°C Mass Standards 1) 2) - 10 .. + 70 °C - 25 .. + 85 °C 25 Ω 95 g EN 50178: 1997 Application domain • Industrial. The result of the coercive field of the magnetic circuit With a di/dt of 100 A/µs. page 1/3 061031/7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. www.lem.com Current Transducer LF 305-S Isolation characteristics Vd Vw Rms voltage for AC isolation test, 50/60 Hz, 1 mn Impulse withstand voltage 1.2/50 µs 3.8 10 kV kV dCp dCl CTI Creepage distance Clearance distance Comparative Tracking Index (Group II) 11.9 11.5 175 mm mm Application examples According to EN 50178 and IEC 61010-1 standards and following conditions: • Over voltage category OV 3 • Pollution degree PD2 • Non-uniform field EN 50178 IEC 61010-1 Rated isolation voltage Nominal voltage Single isolation 1000 V 1000 V Reinforced isolation 500 V 500 V dCp, dCI, VW Safety This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturer's 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 built-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 061031/7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. www.lem.com Dimensions LF 305-S (in mm. 1 mm = 0.0394 inch) Connection Bottom view Right view Back view Top view Mechanical characteristics Remarks • General tolerance • Transducer fastening • IS is positive when IP flows in the direction of the arrow • Temperature of the primary conductor should not exceed Vertical position Recommended fastening torque or Recommended fastening torque Flat lying position Recommended fastening torque or Recommended fastening torque • Primary through-hole • Connection of secondary ± 0.5 mm 2 holes ∅ 4.3 mm 2 steel screws M4 3.2 Nm or 2.37 Lb.-Ft. 4 holes ∅ 1.9 mm, depth : 7 mm 4 screws PTKA 25, length: 6 mm 0.7 Nm or 0.52 Lb.-Ft. 4 holes ∅ 4.3 mm 4 steel screws M4 2.9 Nm or 2.14 Lb.-Ft. 4 holes ∅ 1.9 mm, crossing 4 screws PTKA 25, length:10 mm 0.75 Nm 0.55 Lb.-Ft. ∅ 20 mm Molex 5045-03/A 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. page 3/3 061031/7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. www.lem.com