LF310-S

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Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 7

Technical content

Features

• Bipolar and insulated current measurement up to 500 A
• Current output
• Closed loop (compensated) current transducer
• Panel mounting. Advantages
• High accuracy
• Very low offset drift over temperature.

Applications

• Windmill inverters
• Test and measurement
• Substations
• AC variable speed and servo motor drives
• Statics converters for DC motors drives
• Battery supplied applications
• Uninterruptible Power Supplies (UPS)
• Switched Mode Power Supplies (SMPS)
• Power supplies for welding applications. Standards
• EN 50178: 1997
• IEC 61010-1: 2010
• UL 508: 2010. Application Domain
• Industrial.

27October2015/Version 5 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com LF 310-S Absolute maximum ratings Parameter Symbol Unit Value Maximum supply voltage (working) (−40 … 85 °C) ±UC V ±21 Primary conductor temperature TB °C 100 Maximum steady state primary current (−40 … 85 °C) IPN A 300 Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. UL 508: Ratings and assumptions of certification File # E189713 Volume: 2 Section: 9 Standards

• USR indicates investigation to the Standard for Industrial Control Equipment UL 508.
• CNR indicates investigation to the Canadian standard for Industrial Control Equipment CSA C22.2 No. 14-13 Conditions of acceptability When installed in the end-use equipment, with primary feedthrough potential involved of 600 V AC/DC, consideration shall be given to the following: 1 - These products must be mounted in a suitable end-use enclosure. 2 - The secondary pin terminals have not been evaluated for field wiring. 3 - Low voltage control circuit shall be supplied by an isolating source (such as transformer, optical isolator, limiting impedance or electro-mechanical relay). 4 - Based on the temperature test performed on all Series, the primary bar or conductor shall not exceed 100 °C in the end use application. Marking Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL’s Follow- Up Service. Always look for the Mark on the product.

27October2015/Version 5 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com LF 310-S Insulation coordination Parameter Symbol Unit Value Comment Rms voltage for AC insulation test, 50 Hz, 1 min Ud kV 3.8 Impulse withstand voltage 1.2/50 µs ÛW kV 10 Insulation resistance RIS MΩ 1000 measured at 3.8 kV AC Comparative tracking index CTI 600 Application example 300 V CAT III, PD2 Reinforced insulation, non uniform field according to EN 50178, IEC 61010 Application example 1000 V CAT III, PD2 Basic insulation, non uniform field according to EN 50178, IEC 61010 Case material - - V0 according to UL 94 Clearance and creepage See dimensions drawing on page 7 Environmental and mechanical characteristics Parameter Symbol Unit Min Typ Max Comment Ambient operating temperature TA °C −40 85 Ambient storage temperature TS °C −50 90 Mass m g 107

27October2015/Version 5 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com LF 310-S Electrical data At TA = 25 °C, ±UC = ±15 V, RM = 1 Ω, unless otherwise noted. Lines with a * in the conditions column apply over the −40 … 85 °C ambient temperature range. Parameter Symbol Unit Min Typ Max Conditions Primary nominal rms current IPN A 300 * Primary current, measuring range IPM A −500 500 * Measuring resistance RM Ω 0 * Max value of RM is given in figure 1 Secondary nominal rms current ISN A −0.15 0.15 * Resistance of secondary winding RS Ω 22.5 RS (TA) = RS × (1 + 0.004 × (TA + ∆temp−25)) Estimated temperature increase @ IPN is ∆temp = 15 °C Secondary current IS A −0.25 0.25 * Number of secondary turns NS 2000 Theoretical sensitivity Gth mA/A 0.5 Supply voltage ±UC V ±11.4 ±21 * Current consumption IC mA 33 + IS 35 + IS 38 + IS ±UC = ±12 V ±UC = ±15 V ±UC = ±20 V Offset current, referred to primary IO A −0.2 0.2 Temperature variation of IO, referred to primary IOT A −0.2 0.2 * Magnetic offset current, referred to primary IOM A ±0.2 After 3 × IPN Sensitivity error εG % −0.1 0.1 * Linearity error εL % of IPN −0.05 0.05 * Overall accuracy at IPN XG % of IPN −0.2 −0.2 0.2 0.2 * 25 … 85 °C −40 … 85 °C Output rms noise current referred to primary Ino mA 35 1 Hz to 100 kHz (see figure 4) Reaction time @ 10 % of IPN tra µs 0.5 0 to 300 A, 100 A/µs RM = 10 Ω Step response time to 90 % of IPN tr µs 0.5 0 to 300 A, 100 A/µs RM = 10 Ω (see figure 2) Frequency bandwidth BW kHz 100 RM = 50 Ω; −3 dB Definition of typical, minimum and maximum values Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shown in “typical” graphs. On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower limits and a probability for measured values to lie within this interval. Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that the probability for values of samples to lie in this interval is 99.73 %. For a normal (Gaussian) distribution, this corresponds to an interval between −3 sigma and +3 sigma. If “typical” values are not obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to an interval between −sigma and +sigma for a normal distribution. Typical, minimum and maximum values are determined during the initial characterization of the product.

27October2015/Version 5 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com LF 310-S 50 100 150 200 250 300 350 400 450 500 550 100 150 200 250 Ip (A) RM (Ω)

300 A, 36 Ω

300 A, 55 Ω

300 A, 87 Ω

Uc = 11.4 V @ 85 °C Uc = 14.25 V @ 85 °C Uc = 19 V @ 85 °C fc (Hz) Primary referred Total RMS noise current in the frequency range [1...10] MHz Ino (A rms) Figure 1: Maximum measuring resistance IP RM max = NS − RS max− 2.4 Ω UC min − 1.2 V Figure 3: Typical noise voltage density eno with RM = 10 Ω Figure 4: Typical total output current noise with (primary referred, rms) with RM = 10 Ω To calculate the noise in a frequency band f1 to f2, the formula is: with Ino (f) read from figure 4 (typical, rms value). Example: What is the noise from 103 to 106 Hz? Figure 4 gives Ino (103 Hz) = 3.19 mA and Ino (106 Hz) = 84.4 mA. The output current noise (rms) is therefore: Ino (f1 … f 2) = Ino (f2)2 − Ino (f2)2 (84.4 × 10 − (3.19 ×10 = 84.34 mA referred to primary Figure 2: Typical step response (0 to 300 A, 100 A/µs RM = 10 Ω) Typical performance characteristics −170 −160 −150 −140 −130 −120 −110 fc (Hz) en (dB Vrms/ Hz1/2) Noise Voltage Spectral Density O 0 10 20 30 40 50 60 70 Time (µs) Input 100 A /div Output 50 mA/div

27October2015/Version 5 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com LF 310-S Mechanical characteristics

• General tolerance ±0.3 mm
• Transducer fastening
• Vertical position 2 holes ⌀ 4.3 mm
• 2 M4 steel screws
• Recommended fastening torque 2.1 N·m (±10 %)
• Transducer fastening
• Horizontal position 4 holes ⌀ 4.3 mm
• 4 M4 steel screws
• Recommended fastening torque 2.1 N·m (±10 %)
• Connection of secondary MOLEX 6410
• Primary through hole ⌀ 20 mm Remarks
• IS is positive when IP flows in the direction of arrow.
• The secondary cables also have to be routed together all the way.
• Installation of the transducer is to be done without primary current or secondary voltage present.
• Maximum temperature of primary conductor: see page 2.
• This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us.
• Installation of the transducer must be done unless otherwise specified on the datasheet, according to LEM Transducer Generic Mounting Rules. Please refer to LEM document N°ANE120504 available on our Web site: Products/ Product Documentation. Safety This transducer must be used in limited-energy secondary circuits according to IEC 61010-1. 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 connection, 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. Connection Dimensions (in mm) dCI dCp 10.5 10.8 IP IS RM UC UC 0 V