Friday 25 January 2013

High-accuracy 130A and 150A current transducers

LEM has introduced the LA 130-150 series of current transducers for use in motor drives, inverters, power supplies and general industrial applications. These printed-circuit board (PCB) mounted devices share a common, compact case outline, and are available to measure nominal full-scale currents of 130 and 150 ARMS. Thanks to the application of LEM's established expertise in Closed-Loop Hall Effect transducer technology, the LA 130-150 series offers high-accuracy, extremely linear measurements at a very competitive price.

The new series series measures DC, AC, and pulsed currents, providing an output in the form of a current signal proportional to the measured (primary) current. Two conversion ranges – a factor of 1000 or 2000 – are offered, with two mounting styles; the transducers can be supplied with an open aperture through which the current carrying the primary current is routed: or they can be supplied ready-fitted with a primary conductor that will connect direct to the host PCB. Within the 33.5(H) x 37(W) x 16(D)mm outline, the conductor aperture is a generous 13.5 x 10 mm. In form, footprint and function the LA 130-150 series is backward-compatible with LEM's prior-generation devices.

These transducers feature a wide maximum bandwidth of DC to 150 kHz (-1dB point) and an accuracy of better than 0.5% at the primary nominal RMS current and at ambient temperature. Typical linearity error is ±0.1% at nominal current and the maximum offset temperature drift is ±0.46% of nominal current from -40 to +85˚C. The Closed-Loop Hall-effect technology results in zero insertion losses and a fast response time of less than 500 nsec.

The LA 130-150 series will find application at multiple points within variable-speed AC motor and servo motor drives; in static converters for DC motor drives; monitoring currents in battery-supply installations, and in uninterruptible power supplies (UPSs); in specialist power supplies, for example, welding PSUs; and in switch-mode power supplies in general, together with a wide range of other industrial, domestic-appliance and HVAC (heating, ventilating and air-conditioning) applications.

Safety has been addressed as a primary design objective by LEM's engineers. Large creepage and clearance distances of 8 mm, together with a high CTI (Comparative Tracking Index) of 600 provide a high level of safety insulation with an isolation test voltage of 4.3 kVRMS at 50Hz for 1minute.

The LA 130-150-P series, is CE marked, comes with a five-year warranty, and conforms to the EN50178 standard.

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