LV20-P

Voltage Transducer LV 20-P IPN = 10 mA VPN = 10 .. 500 V For the electronic measurement of voltages : DC, AC, pulsed..., with a galvanic isolation between the primary circuit (high voltage) and the secondary circuit (electronic circuit). Electrical data I PN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance with ± 12 V with ± 15 V ISN KN VC IC Vd 10 mA 0 .. ± 14 mA RM min RM max @ ± 10 mA max @ ± 14 mA max @ ± 10 mA max @ ± 14 mA max Secondary nominal r.m.s. current Conversion ratio Supply voltage (± 5 %) Current consumption R.m.s. voltage for AC isolation test 1), 50 Hz, 1 mn 30 30 100 100 190 100 350 190 Ω Ω Ω Ω 25 mA 2500 : 1000 ± 12 .. 15 V 10 (@ ±15 V ) + IS m A 2.5 kV Features • Closed loop (compensated) voltage transducer using the Hall effect • Insulated plastic case recognized according to UL 94-V0 • Optimized. Principle of use • For voltage measurements, a current proportional to the measured voltage must be passed through an external resistor R 1 which is selected by the user and installed in series with the primary circuit of the transducer. Accuracy - Dynamic performance data XG Overall Accuracy @ IPN , TA = 25°C ε Linearity L @ ± 12 .. 15 V @ ± 15 V (± 5 %) ± 1.1 ± 1.0 < 0.2 Typ IO IOT Offset current @ IP = 0, TA = 25°C Thermal drift of IO tr Response time 2) @ 90 % of VP max 0°C .. + 25°C + 25°C .. + 70°C Max ± 0.20 ± 0.10 ± 0.30 ± 0.14 ± 0.40 % % % 40 mA mA mA µs General data TA TS RP RS m Ambient operating temperature Ambient storage temperature Primary coil resistance @ TA = 70°C Secondary coil resistance @ TA = 70°C Mass Standards 3) 0 .. + 70 - 25 .. + 85 250 110 22 EN 50178 °C °C Ω Ω g Advantages • • • • • • Excellent accuracy Very good linearity Low thermal drift Low response time High bandwidth High immunity to external interference • Low disturbance in common mode. Applications • AC variable speed drives and servo motor drives • Static converters for DC motor drives • Battery supplied applications • Uninterruptible Power Supplies (UPS) • Power supplies for welding applications . Notes : 1) 2) 3) Between primary and secondary R 1 = 25 kΩ (L/R constant, produced by the resistance and inductance of the primary circuit) A list of corresponding tests is available LEM Components 010802/0 w w w.lem.com Dimensions LV 20-P (in mm. 1 mm = 0.0394 inch) Bottom view Right view Top view Standard 00 or No SP.. Year Week Secondary terminals Terminal + : supply voltage + 12 .. 15 V Terminal M : measure Terminal - : supply voltage - 12 .. 15 V Connection Back view Mechanical characteristics Remarks • General tolerance • Fastening & connection of primary • IS is positive when VP is applied on terminal +HT. • This is a standard model. For different versions (supply ± 0.2 mm 2 pins 0.635 x 0.635 mm • Fastening & connection of secondary 3 pins ∅ 1 mm • Recommended PCB hole 1.2 mm voltages, turns ratios, unidirectional measurements...), please contact us. Instructions for use of the voltage transducer model LV 20-P Primary resistor R 1 : the transducer’s optimum accuracy is obtained at the nominal primary current. As much as possible, R 1 should be calculated so that the nominal voltage to be measured corresponds to a primary current of 10 mA . Example: Voltage to be measured V PN = 250 V a) R 1 = 25 kΩ / 2.5 W, IP = 10 mA b) R 1 = 50 kΩ / 1.25 W, IP = 5 mA Accuracy = ± 1 % of V PN (@ TA = + 25°C) Accuracy = ± 2 % of V PN (@ TA = + 25°C) Operating range (recommended) : taking into account the resistance of the primary windings (which must remain low compared to R 1, in order to keep thermal deviation as low as possible) and the isolation, this transducer is suitable for measuring nominal voltages from 10 to 500 V. LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.