CT PCB User`s Manual
Contents
1. CT PCB Series SADBIMOSNVAL LN AA II NOISLIAA All Rights Reserved CAEN ELS d o o Rev 1 7 March 2015 O CAEN ELS d o o Kra ka ulica 2 6210 Sezana Slovenija Mail info caenels com Web www caenels com CT PCB Series User s Manual Table Of Contents L INITIRODUU EHNEN 8 1 1 CT PCB SERIES OVERVIEW ses es GE dese dili ds ee Ge ee ee se sja 8 1 2 CT PCB MODELS AND VERSIONS isisessonssesesesesesresesesesrsrereresesesreresesesesrerene 10 2 INSTALLATION AND OPERATION cccccccccccccccccccccccccccccccccccces 11 2 1 CC ONNPCTIONS ARA 11 2 2 RECOMMENDED PCB FOOTPRINT tis ccceccscecccecscececcscecesceccscecsescesescecesees 12 2 3 PCB LAYOUT GUIDELINES es es es es es va ee ee ee ee aa ee ee aaa ee ee ee ee ee ee ee ee ee ee ee ee 14 2 4 SECONDARY SIDE SIGUES ee ee ee ee ee 14 2 4 1 Power Supp a ees sesse 15 2 4 2 Second sesse see 15 2 4 3 Voltage Output V versions only use AA ge ee ee ee 15 2 4 4 aeu no EE E 16 A TECHNICAL SPECIEICAT TIONS esee oteece voee eeveetoseovesveceeveeseeteceirecesse eee 18 3 1 Lg i N 19 3 2 ENEE SHUNT RESISTOR ees se ee EEN 20 3 3 En Data e N 21 4 MECHANICAL DIMENSIONS 20000000000 00000 00000 0000 ov 00 eu Ressssessssessosesb esse 22 CT PCB Series User s Manual Date 0 March 14 2013 April 4 2013 First official release 01 S aod added updated id 16 Le January 6 2014 Noise data added and OK and OK chang2. be connected on the Is output pin in the current output versions is shown hereafter in the following chart 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110 100 Maximum Shunt Resistor Q I mA Figure 11 Maximum external shunt resistor Current version only gt CT PCB Series User s Manual Technical Specifications 3 3 Isolation Data AC Isolation RMS Test Voltage 50 60 Hz 1 min between Ip amp Ip terminal and secondary Table 5 Insulation data 21 Mechanical Dimensions CT PCB Series User s Manual 4 Mechanical Dimensions The mechanical dimensions of the CT PCB series DC Current Transducers are hereafter presented all dimensions are in mm Figure 12 Mechanical drawings QG
3. herein presented Technical Specifications Maximum DC Primary 13A 126 A 52 A Current Iro i i Maximum RMS Secondary 37 mA Current Is RMS Small Signal Bandwidth 500 kHz 3 dB typ BW 200 kHz V version 10 4 V Output Voltage V version Vout Maximum Output Current V version S SMA lt 5 ppm 18 bi CT PCB Series User s Manual Technical Specifications Secondary Coil Resistance 42 0 RsEc Connections 16 pin through hole PCB mounting Operating Temperature 0 C 50 C 0 C 50 C 0 C 40 C Range i mae ee Mechanical Outer 66 x 64 x 48 mm Dimensions Maximum Weight 300 g Table 3 Technical Specifications 3 1 Equivalent Imput Noise The typical equivalent input noise of the CT PCB transducer series is hereafter presented as a function of the measuring bandwidth and of the model The table and its graph are valid for all models and for both current and voltage output options Equivalent Input Noise for CT 13 and CT 26 and CT 52 Bandwidth Equivalent Input Noise ppm FS 200 Hz 1 0 m 8 10 kHz Table 4 Equivalent Input Noise typical values Technical Specifications CT PCB Series User s Manual a O Equivalent Input Noise ppm FS O HP N LA IA UI m NM OO O N N O 200 2000 20000 Bandwidth Hz Figure 10 Eguivalent Input Noise graph typical values 3 2 External Shunt Resistor The maximum value of the external shunt resistor that can
4. Figure 3 and the following table 1 e Table 2 in order to perform correct connections to the PCB for each model Warranty void if seal is broken Pin H Pin 16 Vo RET Vo Ok Ok Pin 8 c Pin 9 CAENels beer For Science Figure 3 Pinout scheme of the CT PCB series transducers top view Installation and Operation CT PCB Series User s Manual CT 13 or CT 26 CT 13Vor CT 26V or CT 52 or CT 52V Current Output Voltage Output Table 2 Transducer pinouts Please note that pins not present on the respective model and version are indicated in Table 2 as nc not connected 2 2 Recommended PCB Footprint In order to correctly place mount and connect the CT current transducers to the Printed Circuit Board PCB the recommended PCB footprint is represented in Figure 4 dimensions in mils and Figure 5 dimensions in mm Please note that referring to Table 2 mounting holes for pin 15 and pin 16 can be discarded for the CT 13 CT 26 and CT 52 transducers while hole for pin 9 can be discarded when using the V versions CT 13V CT 26V and CT 52V TG ii EEN O le 200 00 Hole Size 70 mils Annular Ring 35 mils gt 00000000 00000000 gg Figure 4 Recommended PCB footprint dimensions in mils Hole Size 1 8 mm Annular Ring 0 7 mm O e e RR gt Figure 5 Recommended PCB footprint dimensions in mm 13 Installation and Operation CT PCB Series U
5. ed pinout April 2 42014 CT 52 version added April 7 2014 External shunt resistor added November 3 2014 Manual graphics changed March 11 2014 Offset specification updated l 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 CT PCB Series User s Manual Safety information Warnings CAEN ELS will repair or replace any product within the guarantee period if the Guarantor declares that the product is defective due to workmanship or materials and has not been caused by mishandling negligence on behalf of the User accident or any abnormal conditions or operations Please read carefully the manual before operating any part of the instrument Z WARNINGZ Do NOT open the boxes CAEN ELS d o o declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User It is strongly recommended to read thoroughly this User s Manual before any kind of operation CAEN ELS d o o reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice Disposal of the Product The product must never be dumped in the Municipal Waste Please check your local regulations for disposal of electronics products CT PCB Series User s Manual Read over the instruction manual carefully before using the instrument The following precautions should be strictly observed before using the CT PCB series DCCTs Do not use this produc
6. ent Sensor is based on a closed loop technology that allows accurate and precise monitoring of DC and AC currents with high bandwidth The metal casing guarantees higher noise immunity and reduces undesired noise pick up from external sources The transducers CT 13 and CT 26 are PCB mount devices rated at maximum currents of 13A 26A and 52A with primary to secondary transformation ratio of 1 250 1 500 and 1 1000 respectively Galvanic isolation between the primary and the secondary circuits allows to measure currents at a different potential and simplifies interfacing if using the Es as the feedback element of current regulated power supplies Output from the Cus sensors can be chosen between two different versions standard secondary current output or buffered voltage output low temperature coefficient shunt resistor and low noise amplifier are embedded in the CT 13V CT 26V and CT 52V versions Main characteristics of the Es current transformers are negligible temperature coefficient on the secondary output current excellent linearity and extremely low noise DC current transformers represents the ideal replacement for systems where Hall effect sensors are used as current sensing elements and better performances are needed The compact mechanical dimensions of this transducer series and its limited weight allows easy mounting on printed circuit boards with a Through Hole TH topology A plastic cover is placed on the bottom side of t
7. he device to allow easier mounting on the PCB Main application fields for these current transducers are precise and extremely stable regulated power supplies and power inverters e JE CT PCB Series User s Manual Introduction Due to the excellent characteristics the O FLUCS transformers can be used in a variety of calibration acceptance testing and quality control applications in the industrial and automotive fields Commercially available versions of the PCB mount O FLUCS current transformers are the current output CT 13 CT 26 and CT 52 with their respective V voltage output versions CT 13V CT 26V and CT 52V Top view of a sample of the O FLUCS CT PCB Series current transducer 1s presented in Figure 1 Figure 1 Top view of a CT 26 O FLUCS current transducer Bottom view of the same current transducer with pin connectors and warranty seals visible is presented in Figure 2 Figure 2 Bottom view of a CT 26 O FLUCS current transducer All the CT PCB series transducers have the same mechanical dimensions and the CT 13 CT 26 and CT 52 can be easily interchanged together OO 3 Introduction CT PCB Series User s Manual 1 2 CT PCB Models and Versions The Es CT PCB series of current transducer has three different models that differ for primary current rating each model is available in two different output versions i e secondary current output standard or secondary voltage o
8. rectly in a single point connection e g on an tI Installation and Operation CT PCB Series User s Manual external ADC ground pins or Vin pin The availability of this return signal is very useful in order to avoid additional ground loop noise pickup on the voltage output version of the transducer Please note that the maximum differential voltage between the VO RET and the GND pin has to be kept within 0 5V VvonET m Vonn lt 0 5 V In the voltage output V version of the transducers the current output pin Is pin 9 is not present A screenshot of a primary lA 20 kHz current sine wave superimposed on a DC current offset of 0 5A and the respective voltage output of a CT 13V transducer are shown in Figure 7 Figure 7 Primary current and voltage output measured between pins Vo and Vo RET Please note that output impedance for the V version models is 50 Q 2 4 4 OK Signal An OK signal obtained from the outputs of an optocoupler phototransistor OK and OK pins 14 and 13 respectively is present on all versions of the CT series Please note that the OK signal is not internally connected to the ground potential and can be connected to an external reference potential A pull up resistor is needed between the OK and some supply voltage referred to the OK potential in order to correctly obtained the correct signaling Two examples on how to connect the OK and OK signals are hereafter presented in Fig
9. ser s Manual 2 3 PCB Layout Guidelines Since the primary flowing into the primary conductor can be as high as 52A for the CT 52 and CT 52V models it is necessary to correctly connect the current to be measured to the input pins 1 to 8 The recommended PCB layout is herein shown in Figure 6 O O O O O O O Figure 6 Recommended PCB layout for primary conductor It is highly recommended to make multiple planes tracks on different PCB layers in order to bring the primary current to the CT pins The use of thermal reliefs 30 mils to allow easier soldering to the PCB is also strongly suggested NOTE primary current needs to be shared equally among all input pins especially for high current values Failure to do so may heat up the device to excessive temperature values 2 4 Secondary side Signals The signals on the secondary side of the CT current transducers are found from pin 9 to pin 16 please note that not all of them are present on all versions EE CT PCB Series User s Manual Installation and Operation 2 4 1 Power Supply Supply voltages for the CT have to be fed to pin 10 15V and to pin 12 15V both these voltages are referred to pin 11 GND and have a rated tolerance of 6 on the nominal values Maximum current that can be drawn from each one of these supply voltages is of 100 mA 2 4 2 Secondary Current On the standard CT 13 CT 26 and CT 52 versions the secondary current outp
10. t in any manner not specified by the manufacturer The protective features of this product may be impaired if it is used in a manner not specified in this manual e Do not use the device if it is damaged Before you use the device inspect the instrument for possible cracks or breaks before each use e Do not operate the device around explosives gas vapor or dust e Always use the device with the cables provided e Turn off the device before establishing any connection e Do not operate the device with the cover removed or loosened e Do not install substitute parts or perform any unauthorized modification to the product e Return the product to the manufacturer for service and repair to ensure that safety features are maintained CAUTION e This instrument is designed for indoor use and in area with low condensation CT PCB Series User s Manual The following table shows the general environmental requirements for a correct operation of the instrument Environmental Conditions Operating Temperature Operating Humidity Storage Temperature Storage Humidity Requirements 0 C to 50 C 30 to 85 RH non condensing 10 C to 60 C 5 to 90 RH non condensing Introduction CT PCB Series User s Manual 1 Introduction This chapter describes the general characteristics and main features of the DC current transducers of the CT PCB mount series 1 1 CT PCB Series Overview The O FLUCS Es O FLUx Curr
11. ure 8 and in Figure 9 OG 1A 0 8V CT PCB Series User s Manual Installation and Operation OK Ok SIGNA Figure 9 OK signals connections as digital interfacing to 3 3V Note that the connection scheme presented in Figure 8 is referred to the GND potential and the OK SIGNAL is at low level 0 4V if the CT transducer is correctly working while it is at high level 14 5V when the transducer is not In the configuration presented in Figure 9 the current transducer can be easily interfaced to a digital microcontroller a Digital Signal Processor or an FPGA supplied by a 3 3V voltage source Please note that the 3 3V supply and the OK_SIGNAL is referred to DGND potential which can be the same or different from the GND potential on which the CT device is supplied from The OK SIGNAL is found to be at low level lt 0 4V when the transducer is correctly working and at high level gt 3V when not 17 mn 3 ry 7 D 1 O e Ce IT DAID CO H T T Af doli nel Kl Anat ze zada Azam 4 Di LJ kovina J laor Y NA rrnma rr I orHNIrry N p Oritirntinn S Hd R Nerio QO I Aan MUA dELIUUEUL ODPECLLCQLUCTL LI 1 UD Vert es USEF S IMUTU al 1 J L e U M Eus ee M a arhnira DFI NMC a Eu a U a e e JA Sr Bh A A AR A A do OEE U LIE U SF TB Technical specifications for Es CT 13 CT 26 and CT 52 current transducers both current and voltage output versions are
12. ut Is scaled by the current transformation ratio 1 250 for the CT 13 1 500 for the CT 26 and 1 1000 for the CT 52 is found on pin 9 Maximum secondary current is rated at 52 mA and an external shunt resistor which can be placed close to the user s desired measuring circuit is needed in order to convert the current signal to voltage The voltage output pins Vo and Vo RET are not installed on CT 13 CT 26 and CT 52 versions 2 4 3 Voltage Output V versions only A buffered output voltage signal is present on the voltage output versions of the CT series 1 e CT 13V CT 26V and CT 52V transducer in order to allow easier connection of the DCCT to an external circuit or an Analog to Digital converter The full scale output bipolar signal Vo pin 15 is referred to Vo RET pin 16 and the behavior is as follows e 10V output if the primary current is 12 5A CT 13V at 25A CT 26V or at 50A CT 52V e 10V output if the primary current is 12 5A CT 13V at 25A CT 26V or at SOA CT 52V This behavior can be resumed in the gain parameter G in V A expressed as the ratio between the transducer output voltage Vy Worer and the primary current p G Vvo VVORET lp This gain value is G 0 8 V A for the CT 13V version G 0 4 V A for the CT 26V version and G 0 2 V A for the CT 52V version VO RET pin is not internally connected to ground GND pin 11 and it should be connected to ground di
13. utput V version The different models and versions of the CT PCB series are summarized in the following table Table 1 Product Code Model Description WCT13XAAAAAA CT 13 13 A Primary Current 977 ME PCB mounting WCT26XAAAAAA CT 26 26 A Primary Current es PCB mounting WCT52XAAAAAA CT 52 52 A Primary Current es PCB mounting i C Lucs i WCT13VXAAAAA CT 13V 13 A Primary Current C PCB mounting Voltage Output 26 A Primary Current es PCB mounting Voltage Output 1 CLUCs j WCT52VXAAAAA CT 52V 52 A Primary Current Bus PCB mounting Voltage Output WCT26VXAAAAA CT 26V Table 1 CT PCB series versions and models On the rear side of the power supply unit are visible the air outlets for cooling output connection terminals interlock and output status connector three phase inputs rail fuses and the analog output monitor coaxial connector o O CT PCB Series User s Manual Installation and Operation 2 Installation and Operation General considerations and description of pinout and recommended PCB layout are herein presented 2 1 Connections Any transducer of the CT PCB series has 16 position pinout connections which that is used to mount the device to a Printed Circuit Board PCB Not all of these sixteen 16 pins are present in all versions since the standard secondary current output version has different signals with respect to the V voltage output version Please refer to the following
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