CT-200/CT-300/CT-400 Series User`s Manual
Contents
1. CAENels Geor For Science me a CAENeis a Por For Sclence Bus gt _ Transducer C OUT ox Mo Id o All Rights Reserved CAEN ELS d o o Rev 1 0 November 2014 CT 200 CT 300 CT 400 User s Manual O CAEN ELS d o o Kra ka ulica 2 6210 Se ana Slovenija Mail info Qcaenels com Web www caenels com CT 200 CT 300 CT 400 User s Manual Table Of Contents E IROD TION e ae ae s a be RR du 9 1 1 CG CURRENT TRANSDUCERS OVERVIEW 00000aaaaa vanno cerner cerner aaa anna 9 1 2 CT 200 CT 300 CT 400 MODELS AND VERSIONS ccceccsceccsceccscececcececes 10 2 INSTALLATION AND OPERATION cccccccscccccccccccccccccccccccccccces 12 2 1 MECHANICAL CONSIDERATIONS c cececceccscecscececcececcececescecescecesescusescecasees 12 22 CONNECTOR PINOUT rererere 2 ka sa edna 13 2 3 SECONDARY SIDE SIGNALS ee ses ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ed 14 2 3 1 Power Supply sm nno 14 2 3 2 Secondary Current current versions ONLY 2 14 2 3 3 Voltage Output V versions only 14 2 3 4 STAS EE N 15 2 4 Matie mm RO N ee 17 2 5 PRIMARY CURRENT PATH EE EE EE N oe 18 2 6 FULL SCALE CURRENT RR ee se ee ee ee ed ee oe ee ee ed 19 GIT F TOING ccsccccsccsccccsccscccccccscccccccsccscccccccs A 20 EL SPECIFICATIONS nm ss sveo s sv vo ooo onecooceo0esecee VA 21 4 1 EE LENT IN nn 22 4 2 INSULATION BAR ee2. 200V CT 300V CT 400V Current Output Voltage Output Is return nc GND 2 fe Vor OO Status nc Vour return o 9 15V Table 2 CT 200 CT 300 and CT 400 pinout Please note that pins not internally connected on the specific model are indicated in Table 2 as nc not connected Please DO NOT connect any signal to the pins indicated as Internal Use Q Installation and Operation CT 200 CT 300 CT 400 User s Manual 2 3 Secondary side Signals The signals on the secondary side of the CT 200 CT 300 and CT 400 current transducers are found on pins 1 2 3 6 7 and 8 please note that not all of them are present on all versions of the DE 9 connector 2 3 1 Power Supply Supply voltages for the CT 200 CT 300 and CT 400 have to be fed to pin 9 15V and to pin 5 15V of the D sub 9 pin connector both these voltages are referred to pin 4 GND Maximum current that can be drawn from each one of these supply voltages is of 250 mA for all three models i e CT 200 CT 300 and CT 400 a maximum of 50 mA for supplying the internal electronics circuits and a maximum of 200 mA for the secondary Current 2 3 2 Secondary Current current versions only On the standard current output versions the secondary current output Is scaled by its current transformation ratio is fed to pin 6 Current return pins are respectively found on pin 1 and on pin 7 Maximum secondary current depends over the full
3. ND OK OK SIGNA Figure 6 OUT OK signals connections as digital interfacing to 3 3V Note that the connection scheme presented in Figure 5 is referred to the GND potential and the OK_SIGNAL is at low level lt 0 4V if the current transducer 1s correctly working while it is at high level gt 14 5V when the transducer is not In the configuration presented in Figure 6 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 transducer 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 Dc Current e Figure 7 STATUS OUT OK indications The OUT OK green light is on as shown in Figure 7 whenever the device is correctly working and regulating secondary output current 1 e zero flux is established and secondary circuit is closed on the shunt resistor external or internal in the V versions a CT 200 CT 300 CT 400 User s Manual Installation and Operation 2 4 Mounting The current transducers can be mounted in different configurations depending on user s needs and opportunities but heatsink shall never be faced to the floor The transducers are desi
4. T 200 CT 300 CT 400 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 200 CT 300 CT 400 User s Manual Read over the instruction manual carefully before using the instrument The following precautions should be strictly observed before using the device CAUTION Do not use this product 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 Do not uSe the device if it is damaged Before you use the de
5. T head the Magnetic flux density is higher in the area between the U path If the current path return is split in two or more paths over the DCCT Head the magnetic flux density is more homogenous over the perimeter and the resulting measurement will be more accurate If the split return path is not possible it is preferable to keep the retuning cable as far as possible from the DCCT Head a C CT 200 CT 300 CT 400 User s Manual Installation and Operation 2 6 Full Scale Current Rated full scale primary current can be easily changed by carrying out multiple turns on the primary conductor hole The full scale current can then be scaled by a factor of N with N number of turns of the primary conductor around the hole As an example see figure Figure 11 a primary full scale current of 300 A in the CT 300 model can be easily scaled by a factor 2 applying two primary turns and so the obtained full scale will be 150 A or by a factor 3 applying three turns and so the obtained full scale will be 100 A and so on Figure 11 primary full scale current scaled by a factor 2 2 primary turns left and scaled by 3 3 primary turns right Do not apply rated nominal full scale primary current for example 400A for CT 400 when carrying out multiple turns on primary conductor hole Ordering Options CT 200 CT 300 CT 400 User s Manual 3 Ordering Options The CT 200 CT 300 and CT 400 current transducers have two different ve
6. e N MO 24 4 3 EXTERNAL SHUNT RESISTOR eccccececcecscecccececcecuccscecesceeaeeecusescnceecncteces 25 5 MECHANICAL DIMENSIONS 42000000000000 0000 0000 v0v0v0o SAA 21 CT 200 CT 300 CT 400 User s Manual Document Revisions lo September 16 2014 1 0 recommendation section 1 2 12 November 3 2014 Manual graphics changed CT 200 CT 300 CT 400 User s Manual PS1215 Power Supply Recommendations We strongly recommend using this product with the CAEN ELS PS1215 power supply which has been especially deigned in order to obtain low noise operation and it is suited for DCCT measurement system where switching power supplies could corrupt measuring accuracy precision and noise BNC connection for VoltagesQutput DCCT Power Good LED monitors DCCT side AC Line Input SUB D connector The power supply is available in two different versions one to be used with the current output DCCTs and one with the voltage output ones the PS1215V is shown in the previous image Product Code Description PS1215V AC DC Single Output Dual Voltage 15V Low WPS1215VXAAA Noise Power Supply 27W max 3m cable with DB 9 and BNC Voltage Output PS12151 AC DC Single Output Dual Voltage 15V Low WPS1215IXAAA Noise Power Supply 27W max 3m cable with DB 9 and banana plugs Current Output For more information or further details please refer to the PS1215 User s Manual Oe C
7. ent Input Equivalent Input Equivalent Input Noise o Noise Ed Noise 200 Hz DE I AN TS 10 kHz Pam er es ra Table 4 Equivalent Input Noise typical values E06 CT 200 CT 300 CT 400 User s Manual Technical Specifications WW Noise CT 200 Equivalent Input Noise ppm FS N Noise CT 300 CT 400 Figure 12 Equivalent input noise graph typical values Technical Specifications CT 200 CT 300 CT 400 User s Manual 4 2 Insulation characteristics In the following table are represented the insulation characteristics of the CT 200 CT 300 and CT 400 current transducers Parameter Reference IEC 61010 1 conditions over voltage cat III pollution degree 2 IEC 61010 1 conditions over voltage cat Ill pollution degree 2 EN 50178 conditions over voltage cat III pollution degree 2 EN 50178 conditions 600 V over voltage cat III pollution degree 2 RMS voltage for AC insulation test 5 4 KV Between primary and 50 60 Hz 1 min l secondary shield Clearance primary secondary Shorter distance path Table 5 Insulation characteristics Raged insulation voltage RMS basic insulation Raged insulation voltage RMS reinforced insulation Raged insulation voltage RMS basic insulation Raged insulation voltage RMS reinforced insulation The voltage insulation category could be improved if insulated cable is used for the primary circuit nn CT 200 CT 300 CT 400 Use
8. gned to be used in rack mount applications by means of any of the two 2 different 4 hole patterns placed in different sides of the mechanical case Four holes are present onthe bottom of the device as indicated in the Figure 8 Mounting Mounting mm Holes Figure 8 bottom mounting holes pattern Other four holes are present on the rear side of the plastic cover and can be used in order to fix the device by means of self threading screws These holes are indicated in Figure 9 Fixing Holes Figure 9 rear mounting holes for self threading screws oo Installation and Operation CT 200 CT 300 CT 400 User s Manual The self threading screws can have a maximum length of 15 mm 2 9 mm diameter and the types that can be used are hereafter listed e UNI8119 e DIN 7504 P e ISO 15482 2 5 Primary Current Path A non symmetrical layout of the primary current return path may degrade the accuracy and the noise of the current transducer A cross section of the transducer plastic case illustrates what happens if the primary current is not equally distributed over the perimeter of the current transducer head Primary Current a LA zn LI Ld EE NE GE NE E h IM gt g je DCCT Head Figure 10 primary current path non recommended layout left and recommended layout right Figure 10 left shows what happens if the primary current is routed over one side of the DCC
9. l electronics in the V model Connections for power supply and output signals are available through a standard D SUB connector also known as DE 9 The different models and versions of the CT 200 CT 300 and CT 400 are summarized in the following table Table 1 Product Code Model Description WCT200XAAAAA CT 200 200 A Primary Current C Current Output WCT200VXAAAA CT 200V 200 A Primary Current lt s Voltage Output WCT300XAAAAA CT 300 300 A Primary Current Cc Current Output WCT300VXAAAA CT 300V 300 A Primary Current lt s Voltage Output WCT400XAAAAA CT 400 400 A Primary Current GC Current Output WCT400VXAAAA CT 400V 400 A Primary Current CG Voltage Output Table 1 CT 200 CT 300 and CT 400 versions and models The CT Series transducer with the current output acts mainly as a transformer with DC capability that converts a full scale bipolar primary current to a secondary current up to 400 mA The CT 200 CT 300 and CT 400 have a maximum secondary output current of 200 mA The voltage output V version converts the primary bipolar full scale current to a secondary output voltage of 10 V a CT 200 CT 300 CT 400 User s Manual Introduction Front view of a CT 200 CT 300 CT 400 current transducer is presented in Figure 1 CN CAENaie a Gear For Science Figure 1 front view of a CT 200 CT 300 or CT 400 Cres current transducer Rear view of the same current transducer where se
10. lf threading holes for screws are visible is presented in Figure 2 Figure 2 rear view of a CT 200 CT 300 or CT 400 Cres current transducer BS ooo Installation and Operation CT 200 CT 300 CT 400 User s Manual 2 Installation and Operation General considerations and description of pinout and functionalities are herein presented 2 1 Mechanical Considerations Each version of the CT Series current transducer presents an embossed arrow with the CAEN ELS logo on one side of the plastic casing that indicates the verse of the positive primary current measurement This arrow can be seen in Figure 3 on the right side of the enclosure Embossed arrow IR indicating the verse Gear Far Scenes O of positive primary kO current Gl m GE i Positive Current Negative Current Figure 3 embossed arrow indicating the verse of positive primary current z O CT 200 CT 300 CT 400 User s Manual Installation and Operation 2 2 Connector Pinout The CT 200 CT 300 and CT 400 have a standard D SUB 9 pin or commonly referred to as DE 9 in both their current output and voltage output versions The standard pin numbering to refer to is herein presented in Figure 4 Pin 9 Pin 6 Pins 5 Pin 1 Figure 4 D sub 9 connector pin numbering The pinout for the two versions are presented in Table 2 These two versions have current or voltage output pins and their signal returns CT 200 CT 300 CT 400 CT
11. r s Manual Technical Specifications 4 3 External Shunt Resistor The maximum value of the external shunt resistor that can be connected on the Is output pin in the current output versions is shown hereafter in the following charts CT 200 120 110 100 90 80 70 Maximum Shunt Resistor Q 50 40 30 80 100 120 140 160 180 200 I mA Figure 13 CT 200 maximum external shunt resistor Current version only CT 300 110 100 90 80 70 60 50 Maximum Shunt Resistor Q 40 30 20 80 100 120 140 160 180 200 I mA Figure 14 CT 300 maximum external shunt resistor Current version only Technical Specifications CT 200 CT 300 CT 400 User s Manual CT 400 110 100 90 80 Maximum Shunt Resistor Q 26 CT 200 CT 300 CT 400 User s Manual Mechanical Dimensions 5 Mechanical Dimensions The mechanical dimensions of the hereafter presented all dimensions area CT 200 CT 300 and CT 400 case are W 505 g Figure 16 Mechanical drawings 24
12. rnal ADC ground pins or Vm pin The availability of this return signal is very useful in order to avoid additional ground loops and 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 Voer Venp lt 0 5 V In the voltage output V version of the transducers the current output pin Is pin 6 and its return pin 1 are not present Please note that output impedance for the V version models is 50 Q and it is low pass filtered with a 0 5 us time constant 2 3 4 STATUS Signal A STATUS signal obtained from the outputs of an optocoupler phototransistor Status and Status pins 8 and 3 is present on all versions Please note that the OK signal is not internally connected to the ground potential and can be connected to an external reference potential A green LED is also present on the front side of the DCCT indicating the correct operation of the devices 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 Figure 5 and in Figure 6 OK OK Figure 5 OUT OK signals connections using the 15V and the GND pins Installation and Operation CT 200 CT 300 CT 400 User s Manual OK gt DG
13. rsions differing by the secondary output signal types The ordering code is formatted as follows Full Scale Output Version 200 200A Full Scale empty current output 300 300A Full Scale V voltage output 400 400A Full Scale NOTE fields characters shaded in grey color are fixed z O CT 200 CT 300 CT 400 User s Manual Technical Specifications s 4 o LELE S p U CII IC a tl O IN Technical Specifications for current transducers of the CT 200 CT 300 and CT 400 series are herein presented Technical Specifications Maximum DC Primary Current Ippo Maximum RMS Secondary EER Current Is RMS Small Signal Bandwidth 3 dB typ BW PNE Output Voltage V version Vout ee Oupa Current 15mA V version lt 5 ppm lt 15 ppm V version Offset with factory Non Linearity Technical Specifications CT 200 CT 300 CT 400 User s Manual Current Consumption 50 mA Is 7 INSEC Connections D sub 9 connector Operating Temperature 0 C 50 C Range Mechanical Outer 94x91x 50 mm Dimensions Primary Conductor 30 mm o Maximum Weight 380 g Table 3 Technical Specification 4 1 Equivalent Input Noise The typical equivalent input noise of the transducers is hereafter presented as a function of the measuring bandwidth and of the output version The table and its graph are valid for both current and voltage output options CT 200 CT 300 CT 400 Bandwidth Equival
14. scale range and the current transform ratio of the sensor For example for a CT 200 the full scale range is 200 A and its transformation ratio is 1 1000 thus its maximum secondary current is rated at 200 mA An external shunt resistor which can be placed close to the user s desired measuring circuit to avoid the noise pick up is needed in order to convert the current signal to a voltage The voltage output pins Vo and Vo RET cannot be found on standard current output versions 2 3 3 Voltage Output V versions only A buffered output voltage signal is present on the voltage output versions of the transducers in order to allow easier connection of the DCCT to an external circuit or an Analog to Digital converter ADC The full scale output bipolar signal Vo pin 2 for V version is referred to Vo RET pin 7 and the behavior 1s as follows e 10V output if the primary current is equal to positive full scale of the sensor e 1OV output if the primary current is equal to negative full scale of the sensor TS CT 200 CT 300 CT 400 User s Manual Installation and Operation This behavior can be resumed in the gain parameter G in V A expressed as the ratio between the transducer output voltage Vy Vy rer and the primary current p Vvo VVORET G Ip Vo RET pin is not internally connected to ground GND pin 4 and it should be connected to ground directly using a single point connection e g on an exte
15. se The transducers CT Series family has a transform ratio between primary and secondary The transform ratio value depends over the CT Series model External plastic casing guarantees galvanic isolation between the primary and the secondary circuits in order to allow to current measurements at a different potential and simplifies interfacing when using the as the feedback element of current regulated power supplies The internal conductive casing guarantees higher noise immunity and reduces undesired noise pick up from external sources DC current transformers and transducers represent the ideal replacement for systems where Hall effect sensors or shunt resistors are used as current sensing elements and better performances are needed Main application fields for these current transducers are precise and extremely stable regulated power supplies and power inverters Due to the excellent characteristics the Es transiormers can be used in a variety of calibration acceptance testing and quality control applications in the industrial and automotive fields Introduction CT 200 CT 300 CT 400 User s Manual 1 2 CT 200 CT 300 CT 400 Models and Versions The CT 200 CT 300 and CT 400 current transducers are available in two different versions that differ by the output type e standard secondary current output or e buffered voltage output where low temperature coefficient shunt resistor and low noise amplifier are embedded in the interna
16. vice inspect the instrument for possible cracks or breaks before each use Do not operate the device around explosives gas vapor or dust Always use the device with the cables provided Turn off the device before establishing any connection Do not operate the device with the cover removed or loosened Do not install substitute parts or perform any unauthorized modification to the product Return the product to the manufacturer for service and repair to ensure that safety features are maintained This instrument is designed for indoor use and in area with low condensation CT 200 CT 300 CT 400 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 CT 200 CT 300 CT 400 User s Manual Introduction 1 Introduction This chapter describes the general characteristics and main features of the Es Current transducers 1 1 is Current Transducers Overview The Es current transducers family is based on a closed loop technology that allows accurate and precise monitoring of DC and AC currents with high bandwidth Main characteristics of the entire Es family are negligible temperature coefficient excellent linearity and extremely low noi
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