Current Transducer CTSR series IPRN = 300, 600 mA Ref: CTSR 0.3-P, CTSR 0.6-P For the electronic measurement of current: DC, AC, pulsed..., with galvanic isolation between the primary and the secondary circuit. Features Applications Closed loop (compensated) current transducer Residual current measurement Voltage output Leakage current measurement in transformerless PV inverters Single supply voltage Isolated plastic case material recognized First human contact protection of PV arrays Failure detection in power sources according to UL 94-V0 Symmetrical fault detection (e.g. after motor inverter) PCB mounting. Leakage current detection in stacked DC sources Advantages Single phase or three phase nominal current measurement High accuracy Very low offset drift over temperature up to 30 A per wire (DC or AC). Wide aperture (20.1 mm) Standards High overload capability EN 50178 High isolation capability IEC 61010-1 (safety). Reference pin with two modes, Ref In and Ref Out Application Domain Degauss and test functions. Industrial Suitable to fulfil VDE 0126-1-1 and UL 1741. Page 1/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series Absolute maximum ratings Parameter Symbol Unit Value VC V 7 Primary conductor temperature C 110 Impulse overload (100 s, 500 A/s) A 3300 Supply voltage Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. Isolation characteristics Parameter Symbol Unit Value RMS voltage for AC isolation test 50/60Hz/1 min Vd kV 5.4 Impulse withstand voltage 1.2/50 s Vw kV 10.1 Partial discharge extinction voltage @ 10 pC (rms) Ve kV 1.65 Clearance distance (pri. - sec.) dCI mm 11 Shortest distance through air Creepage distance (pri. - sec.) dCp mm 11 Shortest path along device body Comparative tracking index CTI V 600 Comment Application example - 1000 V CAT III PD2 Basic isolation, non uniform field according to EN 50178 Application example - 600 V CAT III PD3 Basic isolation, non uniform field according to EN 50178, IEC 61010 According to UL 508: primary potential involved in Volt rms AC or DC - V For use in a pollution degree 3 environment 600 Primary conductor shall be connected after an overvoltage device or system evaluated by standard UL 1449. Environmental and mechanical characteristics Parameter Symbol Unit Min Ambient operating temperature TA C -40 105 Ambient storage temperature TS C -50 105 Mass m g Standards Typ Max Comment 28 EN 50178, IEC 61010-1, UL 508 Page 2/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series Electrical data CTSR 0.3-P At TA = 25C, VC = + 5 V, output voltage referred to VREF unless otherwise noted. Parameter Unit Primary nominal residual current rms IPRN mA Primary residual current, measuring range IPRM mA -500 Supply voltage VC V 4.75 5 5.25 Current consumption IC mA 16 17.5 21.6 + IP (mA)/NS With NS = 1000 turns - 40C .. 105C VREF V 2.495 2.5 2.505 Internal reference VREF V 2.3 4 Internal resistance of VREF input = 499 Note 1 IOE mA -24 TCVOE Theoretical sensitivity Sensitivity error (Note 2) Reference voltage @ IP = 0 External reference voltage Electrical offset current referred to primary (Note 2) Min Comment Symbol Typ Max 300 500 +7 24 ppm/K 50 570 ppm/K of 2.5 V - 40C .. 105C Gth V/A 4 G % 1.6 RL > 500 k TCG ppm/K 230 - 40C .. 85C 400 - 40C .. 105C Linearity error L % of IPRM 0.5 Reaction time @ 10 % of IPRN tra s 7 RL > 500 k, di/dt > 5 A/s Response time @ 90 % of IPRN tr s 50 RL > 500 k, di/dt > 5 A/s Frequency bandwidth (- 1 dB) BW kHz 3.5 RL > 500 k Output voltage noise (1 Hz .. 10 kHz) Vno mV rms 6 RL > 500 k Magnetic offset current referred to primary (1000 x IPRN) IOM mA 17 X % Temperature coefficient of VOE @ IP = 0 Temperature coefficient of G Accuracy (Note 3) Output voltage referred to GND (during Degauss cycle) V Output voltage referred to VREF (Test current) V Notes: -1.6 0.7 0.5 1 1.9 = (G2+ L2)1/2 0.3 0.5 Note 1 1.2 1.7 Note 1 1) See "Application information" section. Only with a primary nominal residual current, see paragraph "Primary nominal residual current and primary nominal curent". 3) Accuracy @ TA and IP: XTA = (X2 + (TCG*100*(TA - 25))2 + (TCVOE*2.5*(TA - 25 )/Gth*100/ IP )2)1/2 2) Page 3/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series Phase () Relative sensitivity (dB) Typical performance characteristics CTSR 0.3-P Frequency (Hz) Figure 1: Frequency response Figure 2: Output noise, spectral density Figure 3: Output noise, cumulated rms Figure 4: Typical step response Figure 5: Typical step response Page 4/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series Electrical data CTSR 0.6-P At TA = 25C, VC = + 5 V, output voltage referred to VREF unless otherwise noted. Parameter Unit Primary nominal residual current rms IPRN mA Primary residual current, measuring range IPRM mA -850 Supply voltage VC V 4.75 5 5.25 Current consumption IC mA 16 17.5 21.6 + IP (mA)/NS With NS = 1000 turns - 40C .. 105C VREF V 2.495 2.5 2.505 Internal reference VREF V 2.3 4 Internal resistance of VREF input = 499 Note 1 IOE mA -24 TCVOE Theoretical sensitivity Sensitivity error (Note 2) Reference voltage @ IP = 0 External reference voltage Electrical offset current referred to primary (Note 2) Min Comment Symbol Typ Max 600 850 4.2 24 ppm/K 60 520 ppm/K of 2.5 V - 40C .. 105C Gth V/A 2.476 G % 0.7 RL > 500 k TCG ppm/K 100 - 40C .. 105C Linearity error L % of IPRM 0.4 Reaction time @ 10 % of IPRN tra s 5 RL > 500 k, di/dt > 5 A/s Response time @ 90 % of IPRN tr s 30 RL > 500 k, di/dt > 5 A/s Frequency bandwidth (- 1 dB) BW kHz 9.5 RL > 500 k Output voltage noise (1 Hz .. 10 kHz) Vno mV rms 4 RL > 500 k Magnetic offset current referred to primary (1000 x IPRN) IOM mA 17 X % Temperature coefficient of VOE @ IP = 0 Temperature coefficient of G Accuracy (Note 3) Output voltage referred to GND (during Degauss cycle) V Output voltage referred to VREF (Test current) V Notes: -0.2 0.4 0.3 1.3 1.5 = (G2+ L2)1/2 0.3 0.5 Note 1 0.75 1.1 Note 1 1) See "Application information" section. Only with a primary nominal residual current, see paragraph "Primary nominal residual current and primary nominal curent". 3) Accuracy @ TA and IP: XTA = (X2 + (TCG*100*(TA - 25))2 + (TCVOE*2.5*(TA - 25 )/Gth*100/ IP )2)1/2 2) Page 5/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series Phase () Relative sensitivity (dB) Typical performance characteristics CTSR 0.6-P Frequency (Hz) Figure 6: Frequency response Cumulated RMS noise voltage of VM Noise voltage spectral density of VM Device: CTSR 0.6-P #05-61 -60 Device: CTSR 0.6-P #05-61 -1 10 -65 -2 10 -70 n -3 10 -80 V (V) -85 n v (dBVrms/rtHz) -75 -4 10 -90 -95 -5 10 -100 -105 -110 0 10 -6 1 10 3 2 10 f (Hz) 10 4 10 5 10 10 0 10 1 10 3 2 10 fc (Hz) 10 Figure 7: Output noise, spectral density Figure 8: Output noise, cumulated rms Figure 9: Typical step response Figure 10: Typical step response 4 10 5 10 Page 6/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series Application information Filtering, decoupling CTSR transducer Supply voltage Vc (5 V): The CTSR transducers have internal decoupling capacitors, but in the case of a power supply track on the application PCB having a high impedance, it is advised to provide local decoupling, 100 nF or more, located close to the transducer. Reference Vref: Ripple present on the Vref pin can be filtered with a low value of capacitance because of the internal 499 ohm series resistance. The CTSR transducers have an internal capacitor of 22 nF between Vref pin and Gnd pin and the maximum filter capacitance value which could be added is 1 F. Adding a larger decoupling capacitor will increase the activation delay of degauss. Output Vout: The CTSR transducers have an internal low pass filter 470 ohm/22 nF; if a decoupling capacitor is added on Vout pin, the bandwidth and the response time will be affected. In case of short circuit, the transducer CTSR can source or sink up to a maximum of 10 mA on its output Vout. Using an external reference voltage If the Vref pin of the transducer is not used it could be either left unconnected or filtered according to the previous paragraph "Reference Vref". The Vref pin has two modes Ref Out and Ref In: * In the Ref Out mode the 2.5 V internal precision reference is used by the transducer as the reference point for bipolar measurements; this internal reference is connected to the Vref pin of the transducer through a 499 ohms resistor. It tolerates sink or source currents up to 5 mA, but the 499 ohms resistor prevents this current to exceed these limits. * In the Ref In mode, an external reference voltage is connected to the Vref pin; this voltage is specified in the range 2.3 to 4 V and is directly used by the transducer as the reference point for measurements. The external reference voltage Vref must be able: oo either to source a typical current of Vref - 2.5 , the maximum value will be 3 mA when Vref = 4 V. 499 oo or to sink a typical current of 2.5 - Vref , the maximum value will be 0.4 mA when Vref = 2.3 V. 499 The following graphs show how the measuring range of the transducer depends on the external reference voltage value Vref (Vc = 5 V). 600 IPRM 500 mA 200 0 -200 -400 -600 IPRM 850 mA I PRM (mA) I PRM (mA) 400 1000 800 600 400 200 0 -200 -400 -600 -800 -1000 2 3 VREF (V) Upper limit: IP=500 mA Upper limit: IP=-250*Vref+1156.25 Lower limit: IP=-250*Vref+93.75 Lower limit: IP=-500 mA 4 (Vref = 2.3..2.625 V) (Vref = 2.625..4 V) (Vref = 2.3..2.375 V) (Vref = 2.375..4 V) 2 3 VREF (V) 4 Upper limit: IP=850 mA (Vref = 2.3..2.52V) Upper limit: IP=-403.88*Vref+1867.93 (Vref = 2.52..4 V) Lower limit: IP=-403.88*Vref+151.45 (Vref = 2.3..2.48 V) Lower limit: IP=-850 mA (Vref = 2.48..4 V) Page 7/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series Primary nominal residual current and primary nominal current The primary nominal residual current is the sum of the instantaneous values of all currents flowing through the aperture of the transducer. The primary nominal current is the current flowing through any conductor placed into the aperture of the transducer. The presence of a primary nominal current DC or AC leads to an additional uncertainty. For example, with a primary nominal current of 30 A the uncertainty referred to primary is typical 4.3 mA. CTSR transducer in Test mode When the Vref pin is forced at a Low level voltage between 0 and 1 V and is maintained at this level, the output voltage Vout of CTSR transducer exhibits a fixed value (see specification) as if it measured a primary test current. The activation time of test mode is min 30 ms. The CTSR transducer can be maintained in test mode as long as needed for checking that it is fully operating. CTSR transducer in Degauss mode The CTSR transducers go in degauss mode automatically at each power on or on demand by using the Vref pin. At power on: A degauss is automatically generated at each power on of the CTSR transducer; during degaussing the output voltage Vout is maintained at 0.3 V typ. (max 0.5 V). After c.a. 110 ms, the output voltage Vout is released and takes the normal operation level in relation with the measured primary current. Using Vref pin: When the pin Vref is released from the Low level voltage defined in the Test mode above, there is a rising edge on Vref which generates an automatic degauss. The activation of degauss takes typically 40 s after releasing Vref pin, then degauss lasts typically 110 ms. Summary of test and degauss modes at Vref = 2.5 V Vref 2.5 V Test mode Measuring Degauss mode Measuring 1V Vout referred to Vref 1.7 V 110 ms 0.7 V Measured Ipr 30 ms -2 V -2.5 V Measured Ipr Isolation around the CTSR transducer housing Due to the joint between the case and the cover of the CTSR transducer, there is some isolation distance to respect when primary conductors pass around the CTSR housing. The figure below shows the joint and the apertures where the clearance between the secondary part inside the CTSR transducer and the surface of the housing is 3 mm (label E). Page 8/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series PCB Footprint CTSR series Assembly on PCB * Recommended PCB hole diameter * Maximum PCB thickness * Wave soldering profile No clean process only 1.2 mm for secondary pin 2 mm for retention pin 2.4 mm maximum 260 C, 10 s The two retention pins inserted into the case of the transducer are electrically isolated by the housing. Because one of them is close to the secondary connector, it is recommended to connect both to the secondary side GND or +Vc. Consequently any primary conductor must be placed in the PCB at the requested isolation distance regarding these secondary sides (see also paragraph "Isolation around the CTSR transducer housing"). 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 (e.g. primary bus bar, 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. Page 9/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com CTSR series Dimensions CTSR series (in mm, general tolerance 0.3 mm) Connection Page 10/10 3November2011/version 3 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com