120426/21 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com page 1/4 i pn = 100 .. 400 a features vfd and scr waveforms current measurement true rms output 4-20 ma current output panel mounting eliminates insertion loss isolated plastic case recognized according to ul94-v0 advantages large aperture for cable up to ?32mm high isolation between primary and secondary circuits easy installation applications vfd controlled loads vfd output indicates how the motor and attached load are operating. scr controlled loads acurate measurement of phase angle fred or burst fred (time proportioned) scrs. current measurement gives faster response than temperature measurement. switching power supplies and electronic ballasts true rms sensing is the most accurate way to measure power supply or ballast input power. application domain energy and automation ac/dc current transducer dhr-c420 the transducer for the electronic measurement of dc & distorted ac waveform currents, with galvanic isolation between the primary circuit (power) and the secondary circuit (measurement). true rms 4-20 ma current output. electrical data primary nominal primary ac current output current type dc & ac current max. peak value 1) i pn (a.t.rms) i p (a) i out (ma dc) 100 600 4-20 dhr 100 c420 200 600 4-20 dhr 200 c420 300 1000 4-20 dhr 300 c420 400 1000 4-20 dhr 400 c420 r l load resistance < 300 w v c supply voltage 2) + 20 .. 50 v dc i c current consumption 30 ma + i out i sl output current limitation < 25 ma ? p overload capability (ampere turns) 30000 a.t performance data x accuracy @ i pn , t a = 25c (excluding offset) < 1 % of i pn e l linearity error (1% of i pn .. i pn ) < 1.0 % of i pn i out output current @ i p =0, t a = 25c 4 ma+/- i oe i oe electrical offset current @ t a = 25c < 1.0 % of i pn tci oe temperature coeffcient of i oe ( 0..+60 c) 3.2 ma/k (-40..+70 c) 6.4 ma/k tci out temperature coeffcient of i out (% of reading) 0.1 %/k t r response time to 90 % of i pn step < 150 ms bw frequency bandwidth ( 1 db) dc 20..6000 hz general data t a surrounding operating temperature - 40 .. + 70 c t s surrounding storage temperature - 40 .. + 85 c m mass 260 g ipxx protection degree ip20 notes : 1) the max. peak ac current is the highest peak level of the primary signal that is taken into account for accurate true rms calculation. yet the device is designed for maximum continuous true rms value equal to i pn , whereas the output is limited by the above specifed output limitation. 2) according to the ul 508 standard for safety for industrial control equipment, the supply voltage must not exceed 42vdc.
120426/21 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com page 2/4 current transducer dhr-c420 isolation characteristics v b rated isolation voltage rms 3) 300 v according to the standard iec 61010-1 and with the following conditions: - reinforced isolation - over voltage category cat iii - pollution degree pd2 - heterogeneous feld v d rms voltage for ac isolation test 4) , 50 hz, 1min 4.0 kv v w impulse withstand voltage 4) , 1.2/50 us 7.3 kv dcp creepage distance 7.2 mm dcl clearance distance 7.2 mm cti comparative tracking index (group i) > 600 notes : 3) between primary conductor voltage and ground. the voltage category could be improved according to the insulation characteristic given by the cable manufacturer. the ul 508 standard for safety for industrial control equipment requires that only insulated conductors are used as primary circuit with this transducer. 4) between primary (completely flling the aperture) and secondary. transfer characteristics output in ma 20 4 +ipn -ipn
120426/21 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com page 3/4 current transducer dhr-c420 safety and warning notes in order to guarantee safe operation of the transducer and to be able to make proper use of all features and functions, please read these instructions thoroughly! safe operation can only be guaranteed if the transducer is used for the purpose it has been designed for and within the limits of the technical specifcations. ensure you get up-to-date technical information that can be found in the latest associated datasheet under www .lem.com. caution! risk of danger ignoring the warnings can lead to serious injury and/or cause damage! the electric measuring transducer may only be installed and put into operation by qualifed personnel that have received an appropriate training. the corresponding national regulations shall be observed during installation and operation of the transducer and any electrical conductor. the transducer shall be used in electric/electronic equipment with respect to applicable standards and safety requirements and in accordance with all the related systems and components manufacturers operating instructions. caution! risk of electrical shock when operating the transducer, certain parts of the module may carry hazardous live voltage (e.g. primary conductor, power supply). the user shall ensure to take all measures necessary to protect against electrical shock. the transducer is a built-in device containing conducting parts that shall not be accessible after installation. a protective enclosure or additional insulation barrier may be necessary. the transducer shall not be put into operation if the jaw opening is open (split core version) or the installation is not completed. installation and maintenance shall be done with the main power supply disconnected except if there are no hazardous live parts in or in close proximity to the system and if the applicable national regulations are fully observed. safe and trouble-free operation of this transducer can only be guaranteed if transport, storage and installation are carried out correctly and operation and maintenance are carried out with care.
120426/21 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com page 4/4 dimensions dhr-c420 (in mm. 1 mm = 0.0394 inch) dhr-c420 output connector 1(v cc) 2( iout) 3(nc) 4(gnd) (+) (-) 24 vdc power dhr (controller, meter etc) lo ad (-) (+) connections ? wires up to ? 2 mm ? female connector provided (spring terminal blocks) ? user-friendly spring-cage connection for no-tool direct conductor connection mechanical characteristics ? general tolerance 1 mm ? primary aperture ? 32.0 mm ? panel mounting 4 holes ? 4.6 mm ? distance between holes 70 mm & 78 mm (see above drawings) for panel mounting, replace m4 screws by new one (not supplied) with appropriate length to panels thickness. remarks ? the temperature of the primary conductor can not exceed 90 c. ? dynamic performances are the best with a primary conductor completely filling the primary aperture. ? this is a standard model. for different versions (supply voltages, different outputs, bidirectional measurement,...), please contact us. ip is out +24vdc gnd ip is out +24vdc gnd gnd 080725/16 ww w .lem.com lem reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. page 4/4 4 0 6 0 3 2 9 0 1 0 1 5 7 0 4 . 6 0 2 5 2 2 . 2 8 6 . 8 0 6 . 8 0 8 . 3 0 2 . 5 0 6 4 . 6 0 7 8 7 3 3 . 8 0 2 5 4 7 0 8 . 3 0 1 5 2 5 . 6 0 p l u g i n c o n n e c t o r : f k c 2 . 5 / 4 - s t - 5 . 0 8 ( p h o e n i x c o n t a c t ) dimensions dhr-c420 (in mm. 1 mm = 0.0394 inch) 4 0 60 3 2 90 1 0 1 5 70 4 . 6 0 2 5 6.80 6 . 8 0 8 . 3 0 2 . 5 0 6 4 . 6 0 78 3 3 . 8 0 22.28 25 4 7 0 15 2 5 . 6 0 20.34 8 . 3 0 plug in connector: fkc 2.5/4-st-5.08-rf (phoenix contact) connections wires up to ? 2 mm female connector provided (spring terminal blocks) user-friendly spring-cage connection for no-tool direct conductor connection mechanical characteristics general tolerance 1 mm primary aperture ? 32.0 mm panel mounting 4 holes ? 4.6 mm distance between holes 70.0 mm & 78 mm (see above dimensions) for panel mounting, use m4 screws (not supplied) with appropriate length to panels thickness, and tighten to 0.75nm +/-20% torque. remarks the temperature of the primary busbar can not exceed 90 c. dynamic performances are the best with a primary busbar completely flling the primary aperture. this is a standard model. for different versions (supply voltages, different outputs, bidirectional measurements...), please contact us.
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