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Summary of Contents for Campbell CS11
- Page 1 CS11 Current Transformer Revision: 1/19 Copyright © 2001 – 2019 Campbell Scientific, Inc.
- Page 2 Limited Warranty “Products manufactured by CSI are warranted by CSI to be free from defects in materials and workmanship under normal use and service for twelve months from the date of shipment unless otherwise specified in the corresponding product manual. (Product manuals are available for review online at www.campbellsci.com.) Products not manufactured by CSI, but that are resold by CSI, are warranted only to the limits extended by the original manufacturer.
- Page 3 Campbell Scientific company serves your country. To obtain a Returned Materials Authorization (RMA) number, contact CAMPBELL SCIENTIFIC, INC., phone (435) 227-9000. Please write the issued RMA number clearly on the outside of the shipping container. Campbell Scientific’s shipping address is: CAMPBELL SCIENTIFIC, INC.
- Page 4 Periodically (at least yearly) check electrical ground connections. • WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.
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Page 5: Table Of Contents
C. Theory of Operation ..........C-1 Typical Electrical Circuit ..............C-1 Current Transformer Description ............. C-2 Converting a Milliamp Signal to a Millivolt Signal ......C-3 Using a CR300-Series or CR200(X)-Series Datalogger ....C-4 Multiple AC-Wire Passes Through the CS11 ........C-5... - Page 6 Adding 1250 mV creates positive output ......... C-4 C-8. CS11 measurement range ..............C-4 C-9. CS11 with the AC wire making two passes through the CS11 ..C-5 Tables 7-1. CS11 Wire Color, Function, and Data Logger Connection ....6 7-2.
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Page 7: Introduction
The CS11 detects and measures the current along an AC wire using the magnetic field that is generated by that current. The sensor outputs a millivolt signal allowing it to be directly connected to our data loggers. The CS11 is recommended for measurements that do not require high accuracy, such as motor or generator load condition monitoring, efficiency studies, intermittent fault detection, and rough submetering. - Page 8 CS11 Current Transformer In the Available Sensors and Devices box, type CS11 or locate the sensor in the select Sensors | Miscellaneous Sensors folder. Double-click CS11 Current Transformer. The default line frequency is 60 Hz. This can be changed by clicking the Line frequency (Hz) box and selecting 50 Hz.
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Page 9: Overview
The CS11 (FIGURE 5-1) uses CR Magnetic’s CR8459 Current Transformer to detect the current along an AC wire using the magnetic field that is generated by that current. The CS11 is external to the AC-wire jacket and has no direct electrical connection to the system. -
Page 10: Specifications
CS11 Current Transformer FIGURE 5-1. Top (right) and bottom views of the CS11 Current Transformer The CS11 was designed to be compatible with most of the data loggers. Specifications Features: • Ideal applications include motor or generator load conditions, efficiency studies, intermittent fault detection, and rough submetering Sensor is external to the wire jacket and has no direct electrical •... -
Page 11: Installation
, for a Short Cut tutorial. (p. 1) Place one AC wire through the hole of the CS11 (see FIGURE 7-1). The sensor may be placed on either the hot or neutral AC wire. FIGURE 7-1. AC load wire installed in CS11 Multiple AC-wire passes are possible and described in Appendix C.5, Multiple... -
Page 12: Programming
CS11 connections to the data logger. When using the ACPower() CRBasic instruction, another sensor, a potential transformer, is required in addition to the CS11 sensor to obtain all of these measurements and values. If the potential transformer is used, its signal wire needs to be connected to a data logger single-ended terminal and its reference wire needs to be connected a data logger analog ground terminal. -
Page 13: Acpower() Instruction
To obtain all of these measurements and values, a potential transformer is required in addition to the CS11 sensor. The data logger measures the current of the CS11 and measures voltage signal and frequency of the potential transformer. -
Page 14: Millivolt Burst Measurements
CS11 Current Transformer 7.2.2 Millivolt Burst Measurements Refer to Section 7.2.1, ACPower() Instruction , if using a potential (p. 7) transformer. Refer to Section 7.2.3, CR300 Series , or Section 7.2.4, (p. 9) , if using these data loggers. CR200X Series (p. -
Page 15: Cr300 Series
With the CR300X-series dataloggers, the CRBasic program uses the ExciteV() instruction to create a positive reference output that the CR300-series dataloggers can measure. The CS11 is measured with the VoltSE() instruction with a range of mV2500, an integration of 4000, and an offset of –1250. -
Page 16: Multiplier
30 Samples of Amperage on CR200X Datalogger (50 Hz) 25 samples of Amperage on CR200 datalogger CS11-L waveform Instanteneous Amps FIGURE 7-3. Graph of a CS11 waveform Multiplier Use Equation 1 to calculate the multiplier that is applied to the RMS value. m = C • n •... -
Page 17: Importing Short Cut Code Into Crbasic Editor
Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows: Importing a Short Cut program into a program editor for additional • refinement Importing a wiring diagram from Short Cut into the comments of a • custom program Short Cut creates files, which can be imported into CRBasic Editor. -
Page 18: Example Programs
'to store values between power cycles DataTable (AmpTable,True,-1) DataInterval (0,1,Min,10) Totalize (1,Real_Power,IEEE4,False) Average (1,Frequency,FP2,False) Average (1,Voltage,FP2,False) Average (1,Amperage,FP2,False) Maximum (1,Phase_Angle,FP2,False,False) Maximum (1,V_Harm_Ratio,FP2,False,False) Maximum (1,I_Harm_Ratio,FP2,False,False) EndTable BeginProg Scan (500,mSec,0,0) Battery (Batt_volt) '0.2 multiplier for the CS11 (200Amps/1000mV=0.2) ACPower (Array1(),1,60,1,0.345345,120,2,.2,200,1) CallTable (AmpTable) NextScan EndProg... -
Page 19: Millivolt Burst Measurement And Multiplexer Sample Program
B.2 Millivolt Burst Measurement and Multiplexer Sample Program This program uses the CR1000X and an AM16/32-series multiplexer to read 32 CS11 Current Transformers. Although this program is for the CR1000X, other data loggers are programmed similarly. TABLE provides wiring for the program. -
Page 20: Cr300-Series Example
'Turn AM16/32 Multiplexer Off PortSet(C4,0) CallTable (AmpTable) NextScan EndProg B.3 CR300-Series Example The following is a CR300-series program for measuring the CS11. TABLE provides wiring for the program. TABLE B-3. Wiring for CR300-Series Program CS11 Wire Color Function CR300 White Signal ⏚... -
Page 21: Cr200(X)-Series Example
'Filter out low end noise when amperage is near zero Crnt_A<0.2 Then Crnt_A=0 CallTable (Amp) NextScan EndProg B.4 CR200(X)-Series Example The following is a CR200(X)-series program for measuring the CS11. TABLE provides wiring for the program. TABLE B-4. Wiring for CR300-Series Program CS11 Wire Color Function CR300 White Signal ⏚... -
Page 22: Theory Of Operation
A sensor is added to the circuit to measure the amperage going through the circuit (see FIGURE through FIGURE C-4). This sensor is called a CT or Current Transformer. The CS11 is a current transformer. FIGURE C-2. Schematic of generator with current transformer... -
Page 23: Current Transformer Description
Appendix C. Theory of Operation FIGURE C-3. Schematic of current transformer with the AC wire FIGURE C-4. CS11 with the AC wire C.2 Current Transformer Description A current transformer is a special kind of transformer that transfers energy from one side to another through magnetic fluxes (see FIGURE C-5). -
Page 24: Converting A Milliamp Signal To A Millivolt Signal
Find the current induced on the secondary windings by solving for i • n Equation B For example: The CS11 current transducer has an n value of 2000 windings. If 20 amps pass through the primary winding, the following amperage is produced on the secondary winding: = 20 •... -
Page 25: Using A Cr300-Series Or Cr200(X)-Series Datalogger
Appendix C. Theory of Operation The CS11 contains a 10-ohm burden (shunt) resistor (R=10 ohm). Therefore, E E = 0.01 amps • 10 ohms = 0.1 volts (or 100 mV) From these calculations, it can be determined if a better resolution on the measurement is needed. -
Page 26: Multiple Ac-Wire Passes Through The Cs11
Appendix C. Theory of Operation C.5 Multiple AC-Wire Passes Through the CS11 You can pass the AC wire multiple times through the CS11 to amplify the amperage signal of the AC wire (FIGURE C-9). However, the data logger program needs a different multiplier and the VoltSE() instruction needs a different measurement range (TABLE C-1). - Page 27 Campbell Scientific Worldwide Offices Australia Germany Location: Garbutt, QLD Australia Location: Bremen, Germany Email: Email: info@campbellsci.com.au info@campbellsci.de Website: www.campbellsci.com.au Website: www.campbellsci.de Brazil South Africa Location: São Paulo, SP Brazil Location: Stellenbosch, South Africa Email: andread@campbellsci.com.br Email: sales@csafrica.co.za Website: Website: www.campbellsci.com.br www.campbellscientific.co.za...
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