090616/4 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com page 1/3 i pn = 50 a features closed loop (compensated) current transducer using the hall effect mounted on printed circuit board insulated plastic case recognized according to ul 94-v0. special features i pm = 0 .. 100 a k n = 1 : 2000 v d = 3.6 kv t a = - 40c .. + 85c potted. 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 single or three phases inverter propulsion and braking chopper propulsion converter auxiliart converter battery charger. application domain traction. current transducer la 55-tp/sp27 for the electronic measurement of currents: dc, ac, pulsed..., with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). electrical data i pn primary nominal current rms 50 a i pm primary current, measuring range 0 .. 100 a r m measuring resistance r m min r m max with 12 v @ 50 a max 0 210 ? @ 100 a max 0 30 ? with 15 v @ 50 a max 30 320 ? @ 100 a max 30 90 ? i sn secondary nominal current rms 25 ma k n conversion ratio 1 : 2000 v c supply voltage ( 5 %) 12 .. 15 v i c current consumption 10 (@ 15 v)+ i s ma x accuracy @ i pn , t a = 25c @ 15 v ( 5 %) 0.65 % accuracy - dynamic performance data @ 12 .. 15 v ( 5 %) 0.90 % l linearity error < 0.15 % typ max i o offset current @ i p = 0, t a = 25c 0.1 ma i om magnetic offset current 1) @ i p = 0 and specifed r m , after an overload of 3 x i pn 0.2 ma i ot temperature variation of i o - 25c .. + 85c 0.1 0.3 ma - 40c .. - 25c 0.2 0.5 ma t ra reaction time to 10 % of i pn step < 500 ns t r response time 2) to 90 % of i pn step < 1 s di/dt di/dt accurately followed > 200 a/s bw frequency bandwidth (- 1 db) dc .. 200 khz t a ambient operating temperature - 40 .. + 85 c general data t s ambient storage temperature - 50 .. + 90 c r s secondary coil resistance @ t a = 85c 140 ? m mass 35 g standards en 50155: 1995 notes : 1) result of the coercive feld of the magnetic circuit 2) with a di/dt of 100 a/s. 16086
090616/4 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com page 2/3 current transducer la 55-tp/sp27 isolation characteristics v d rms voltage for ac isolation test, 50 hz, 1 min 3.6 kv v w impulse withstand voltage 1.2/50 s 7.5 kv min dcp creepage distance 7.5 mm dci clearance distance 7.5 mm cti comparative tracking index (group iiia) 175 safety this transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturers 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.
090616/4 lem reserves the right to carry out modifcations on its transducers, in order to improve them, without prior notice. www.lem.com page 3/3 connection dimensions la 55-tp/sp27 (in mm. 1 mm = 0.0394 inch) top view front view left view mechanical characteristics general tolerance 0.2 mm fastening & connection of primary bus bar 6.4 x 1.6 mm recommended pcb hole 3.8 mm fastening & connection of secondary 3 pins 0.63 x 0.56 mm recommended pcb hole 0.9 mm remarks i s is positive when i p fows in the direction of the arrow. temperature of the primary conductor should not exceed 100c. secondary terminals terminal + : supply voltage + 12 .. 15 v terminal - : supply voltage - 12 .. 15 v terminal m : measure
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