Current Transducer LF 205-S For the electronic measurement of currents: DC, AC, pulsed..., with galvanic separation between the primary circuit and the secondary circuit. Features Electrical data IPN Primary nominal rms current IPM Primary current, measuring range RM Measuring resistance @ with ± 12 V @ ± 200 A max @ ± 420 A max with ± 15 V @ ± 200 A max @ ± 420 A max ISN Secondary nominal rms current KN Conversion ratio UC Supply voltage (+ 5 %) IC Current consumption @ ± 15 V 200 A 0 .. ± 420 A TA = 70 °C TA = 85 °C RM min RM max RM min RM max 0 71 0 69 Ω 0 14 0 12 Ω 0 100 23 98 Ω 0 28 23 26 Ω 100 mA 1 : 2000 ± 12 .. 15 V 17 + IS mA Accuracy - Dynamic performance data XG εL IO IOM IOT tra tr di/dt BW IPN = 200 A Overall accuracy @ IPN, TA = 25 °C ± 0.5 Linearity error < 0.1 Typ Max Offset current @ IP = 0, TA = 25 °C ± 0.2 Magnetic offset current 1) @ IP = 0 and specified RM, after an overload of 3 x IPN ± 0.1 Temperature variation of IO - 40 °C .. + 85 °C ± 0.12 ± 0.4 Reaction time to 10 % of IPN step < 500 Response time 2) to 90 % of IPN step < 1 di/dt accurately followed > 100 Frequency bandwidth (- 3 dB) DC .. 100 % % mA mA mA ns µs A/µs kHz General data TA Ambient operating temperature TS Ambient storage temperature RS Secondary coil resistance @ TA = 70 °C @ TA = 85 °C m Mass Standard - 40 .. + 85 °C - 40 .. + 90 °C 33 Ω 35 Ω 78 g EN 50178: 1997 ●● Closed loop (compensated) current transducer using the Hall effect ●● Insulating 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 motor drives ●● Static converters for DC motor drives ●● Battery supplied applications ●● Uninterruptible Power Supplies (UPS) ●● Switched Mode Power Supplies (SMPS) ●● Power supplies for welding applications. Application domain ●● Industrial. Notes: 1) The result of the coercive force (Hc) of the magnetic circuit 2) With a di/dt of 100 A/µs. Nº 97.14.44.000.0 8June2013/version 17 Page 1/3 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 205-S Isolation characteristics Rms voltage for AC insulation test, 50/60 Hz, 1 min Impulse withstand voltage 1.2/50 µs Partial discharge extinction voltage rms @ 10 pC Creepage distance Clearance Comparative Tracking Index (group IIIa) Ud ÛW Ue dCp dCI CTI 3.5 8.8 > 2 Min 11 10.2 175 kV kV kV mm mm Applications 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 insulation voltage Nominal voltage Basic insulation 500 V 500 V Reinforced insulation 250 V 250 V dCp, dCI, ÛW Safety This transducer must be used in limited-energy secondary circuits according to IEC 61010-1. 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 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 8June2013/version 17 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com Dimensions LF 205-S (in mm) : dCI dCp IS IP RM UC UC dCI dCp IP Connection IP IS RM UC UC Mechanical characteristics ●● General tolerance ●● Transducer fastening Vertical position Remarks ± 0.2 mm 2 holes Ø 4.3 mm 2 steel screws M4 Recommended fastening torque 2.3 N·m Or 4 holes Ø 1.9 mm depth: 7 mm 4 screws PTKA 25 length: 6 mm ●● Transducer fastening Horizontal position 4 holes Ø 4.3 mm 4 steel screws M4 Recommended fastening torque 3.2 N·m Or 4 holes Ø 1.9 mm 4 screws PTKA 25 min length: 11.5 mm with thickness of fixed plate Recommended fastening torque 0.7 N·m ●● Primary through-hole Ø 15.5 mm ●● Connection of secondary Molex 6410 3 Tin plated pins 8June2013/version 17 ●● IS is positive when IP flows in the direction of the arrow. ●● Temperature of the primary conductor should not exceed 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 prior notice Page 3/3 www.lem.com dCI