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| Current Transducer CT 5 .. 25-T For very accurate measurements of currents : DC, AC, pulsed..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). IPN = 5 .. 25 A 0632 Electrical data Primary nominal current I PN (A r.m.s.) 5 10 25 Primary current, measuring range I P (A) 7.5 15 37.5 Conversion ratio K N (A/V) 5 A/5 V 10 A/ 5 V 25 A/5 V CT 5-T CT 10-T CT 25-T Type Features * Closed loop (compensated) current transducer * Insulated plastic case recognized according to UL 94-V0 * Patent pending. V nF s V mA VO U T RL CL tC VC IC Analog output voltage Load resistance Capacitance loading Output short-circuit duration 1) Supply voltage ( 5 %) Current consumption 5 > 500 5 Advanced features * f = 500 kHz * X G = 0.1 % (- 25C .. + 70C). 15 30 + VOUT / RL 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. Accuracy - Dynamic performance data XG VO f tr Overall accuracy @ I PN Offset voltage @ I P = 0 - 25C .. + 70C TA = 25C - 25C .. + 70C 0.1 Max 0.4 0.6 DC .. 500 <1 % mV mV kHz s Frequency bandwidth (- 3 dB) @ 10 % of I PN Response time Applications * AC variable speed drives and servo General data TA TS m Ambient operating temperature Ambient storage temperature Mass Standards - 25 .. + 70 C - 40 .. + 85 C 670 g EN 50178 : 1996 motor drives * Static converters for DC motor drives * Battery supplied applications * Uninterruptible Power Supplies * Switched Mode Power Supplies (SMPS) (UPS) * Power supplies for welding applications. Note : 1) If the short-circuit has a duration more than 1 s, the primary current of the supply voltage must be interrupted for a short time to restore the transducer to proper working order. The internal protection is done by PTC resistors. Application domain * Industrial. Page 1/3 060927/0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. w w w .lem.com Current Transducer CT 5 .. 25-T Isolation characteristics Vd VW dCp dCl CTI R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn Impulse withstand voltage 1.2/50 s 6 > 9.5 Min 104.5 104.5 225 kV kV Creepage distance 5) Clearance distance Comparative Tracking Index (Group III b) 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 dCp, dCI, V W Single isolation Reinforced isolation Rated isolation voltage 1000 V 600 V IEC 61010-1 Nominal voltage 1000 V 600 V Note : 5) Between M5 screws and M5. 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 060927/0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. w w w .lem.com Dimensions CT 5 .. 25-T Front view (in mm. 1 mm = 0.0394 inch) Left view Connection Top view Mechanical characteristics * General tolerance * Transducer fastening * Connection of primary * Connection of secondary * Fastening torque 0.3 mm 2 holes M5 screws 2 steel screws M5 M5 threaded studs M5 threaded studs 2.2 Nm or 1.62 Lb - Ft Remarks * VOUT is positive when IP flows in the direction of the arrow. * This transducer induces into the primary circuit a square wave of 70 mV amplitude (frequency 220 Hz). This voltage can induce an AC current in the primary if the primary impedance is low. * This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. Page 3/3 060927/0 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. w w w .lem.com |
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