LV25P

Voltage Transducer LV 25-P 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). IPN = 10 mA VPN = 10 .. 500 V 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 max @ ± 14 mA max @ ± 10 mA max @ ± 14 mA max 10 mA 0 .. ± 14 mA R M min R M max 30 30 100 100 190 100 350 190 Ω Ω Ω Ω Features •Closed loop (compensated) voltage transducer using the Hall effect •Insulated plastic case recognized according to UL 94-V0. 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 25 mA 2500 : 1000 ± 12 .. 15 V 10 (@ ± 15 V) + IS mA 2.5 kV 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 Linearity Offset current @ IP = 0, TA = 25°C Thermal drift of IO Response time 2) @ 90 % of VP max @ ± 12 .. 15 V @ ± 15 V (± 5 %) ± 0.9 ± 0.8 < 0.2 Max ± 0.15 ± 0.06 ± 0.25 ± 0.10 ± 0.35 40 Typ % % % mA mA mA µs Advantages •Excellent accuracy •Very good linearity •Low thermal drift •Low response time •High bandwidth •High immunity to external interference ε L IO IO T tr 0°C .. + 25°C + 25°C .. + 70°C 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 •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 k Ω (L/R constant, produced by the resistance and inductance of the primary circuit) A list of corresponding tests is available 981125/14 LEM Components w w w .lem.com Dimensions LV 25-P Bottom view (in mm. 1 mm = 0.0394 inch) Right view Top view swiss made Standard 00 or N° 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 •General tolerance •Fastening & connection of primary ± 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 Remarks •IS is positive when VP is applied on terminal +HT. •This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. Instructions for use of the voltage transducer model LV 25-P Primary resistor R 1 : the transducer’ optimum accuracy is obtained at the nominal primary current. As far as possible, R 1 should be s calculated so that the nominal voltage to be measured corresponds to a primary current of 10 mA. Example: Voltage to be measured VPN = 250 V a) R 1 = 25 kΩ / 2.5 W, IP = 10 mA b) R 1 = 50 kΩ / 1.25 W, IP = 5 m A Accuracy = ± 0.8 % of VPN (@ TA = + 25°C) Accuracy = ± 1.6 % of VPN (@ 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.