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33

THEOR

Y

4.  Operating Principles

4.1 

analog proCessing

4.1.1 

V

oLts

The volts signal is brought in through a precision voltage divider of 2 M and 2.4 k resistors. The 
gain is 0.0012. This signal is buffered  (GAIN = 1) and passed into a programmable gain section. 
The gains for the voltage ranges are given below.

range

resistors

gain ( amplifier )

30 V

12 k / 620

-19.350

150 V

2.4 k / 620

-3.871

300 V

1.2 k / 620

-1.936

600 V

620 / 620

-1.000

 

The signal is then presented to an AD7722AS 16-bit analog to digital converter. The part accepts an 
input signal of ± 1.25 volts centered on a 2.5 VDC volt bias. The chart below shows system input 
at 10% and 100% of range.

range

volts in (vdC)

gain (total)

volts at a/d input

bits

30 V

3

-0.023220

-0.0697

1826

30

-0.023220

-0.6966

18261

150 V

15

-0.004645

-0.0697

1826

150

-0.004645

-0.6968

18265

300 V

30

-0.002323

-0.0697

1827

300

-0.002323

-0.6969

18269

600 V

60

-0.001200

-0.0720

1887

600

-0.001200

-0.7200

18874

 

 

Converter Resolution:  2.5 / 2^16  =  2.5 / 65536  =  0.00003814697

Содержание 7500 SERIES

Страница 1: ...7500 Series Power Analyzer User s Manual...

Страница 2: ...rademarks LabVIEW is a trademark of National Instruments Corporation National Instruments is a trademark of National Instruments Corporation Windows is a registered trademark of Microsoft Corporation...

Страница 3: ...2 Securely ground the 7500 Series Power Wattmeter case by connecting a good earth ground at the ground stud located on the rear panel of the unit Use a number 12 AWG or larger wire 3 Check line voltag...

Страница 4: ...Manuals can be found at Magtrol s web site at www magtrol com support manuals htm Please compare the date of this manual with the revision date on the web site then refer to the manual s Table of Rev...

Страница 5: ...2 1 Enabling Secondary Functions 7 2 2 2 Using Front Panel Controls and Buttons 7 2 3 Vacuum Fluorescent Display VFD 9 2 3 1 Contrast Settings 9 2 3 2 Display Guide 10 2 4 Rear Panel 11 2 5 Rear Pane...

Страница 6: ...nterface 42 5 1 1 Installing the GPIB IEEE 488 Connector Cable 42 5 1 2 Changing the GPIB Primary Address 42 5 2 USB Driver Setup for Windows Operation System 43 5 3 Ethernet Connection 45 5 4 Checkin...

Страница 7: ...ression 17 Figure 3 8 Single Phase Two Wire Wiring Schematic 19 Figure 3 9 Single Phase Two Wire Wiring Connection 19 Figure 3 10 Single Phase Three Wire Wiring Schematic 20 Figure 3 11 Single Phase T...

Страница 8: ...Example 39 Figure 4 2 Peak Hold Inrush Current Example 40 Figure 4 3 Crest Factor Example 41 5 Computer Controlled Operation Figure 5 1 GPIB Installation 42 Figure 5 2 GPIB Address Setup Menu 43 Figur...

Страница 9: ...technical data sheet for the 7500 Series Power Analyzer which describes the unit and provides its mechanical and electrical characteristics Chapter 2 CONTROLS Description of the elements located on t...

Страница 10: ...rise if the precautions are ignored WARNING This introduces directives procedures precautionary measures etc which must be executed or followed with the utmost care andattention otherwisethe personal...

Страница 11: ...store the highest value read since the last peak hold was cleared Values can include amps watts and volts in any preferred combination Average Will average the volts amps and watts over the period th...

Страница 12: ...average Displays running average of amps volts and watts Peak Hold Stores the highest value read Values can include amps watts and volts in any combination external shunt Input Calibration Certificate...

Страница 13: ...L 7530 THREE PHASE POWER ANALYZER RS 232 GPIB or M TEST PC USB PC Ready for Rack Mounting Custom Display Setup Amp Readings DC RMS Peak Crest Factor and Peak Hold Inrush Volt Readings DC RMS Peak Cres...

Страница 14: ...Impedance 2 m 12 m 17 K Display range 5 digits with 1 mV resolution 5 digits with 1 mA resolution 5 digits with 1 V resolution 5 digits with 1 mw resolution ACCUrACy DC 0 1 reading 0 2 range 0 4 of VA...

Страница 15: ...ted on conductive surfaces The LAB Series shunt also comes with an insulating base along with thumb screws for the power leads and knurled nuts on the sensing terminals The FL Series is a relatively s...

Страница 16: ...e Power switch Ten double function control buttons Primary Function Secondary Function PHASE DISPLAY q CURRENT RANGE DC current p CURRENT RANGE RMS current AUTO CURRENT RANGE PEAK CF current q VOLTAGE...

Страница 17: ...Function POWER Press I to turn power ON Press O to turn power OFF Turns power ON or OFF SHIFT Press this button and release then press desired control button Enables the function written in blue abov...

Страница 18: ...selects amps auto range Voltage DC Press SHIFT and release then press this button Selects DC voltage measurement RMS Press SHIFT and release then press this button Selects RMS voltage measurement PEAK...

Страница 19: ...CURRENT VOLTAGE POWER PF DEVICE SELECTIONS Figure 2 3 Device Setup Menu 2 Press and buttons until I O appears in the display 3 Press ENTER button 4 Press and buttons until DISPLAY BRIGHTNESS appears...

Страница 20: ...d of time resulting in uneven illumination from segment to segment 2 3 2 Display Guide Following is a reference for symbols abbreviations and messages that are used in the 7500 Symbol Abbreviation Mes...

Страница 21: ...put Connect wires to measure amps through the load series Caution Amps should not exceed 20 A continuous Voltage should not exceed 1000 V AC DC terminal to ground External Sensor Alternate amps input...

Страница 22: ...ations 24 SIGNAL GROUND 23 ATN COM 22 SRQ COM 21 IFC COM 20 NDAC COM 19 NRFD COM 18 DAV COM 17 REN 16 D8 15 D7 14 D6 13 D5 12 SHIELD 11 ATN 10 SRQ 9 IFC 8 NDAC 7 NRFD 6 DAV 5 E01 4 D4 3 D3 2 D2 1 D1 1...

Страница 23: ...SURE THAT ALL MAGTROL DYNAMOMETERS AND ELECTRONIC PRODUCTS ARE EARTH GROUNDED TO ENSUREPERSONALSAFETYANDPROPER OPERATION SECURELY GROUND THE 7500 Series PowerAnalyzer CASE BY CONNECTING A GOOD EARTH...

Страница 24: ...Make sure the 7500 is earth grounded before starting 3 1 1 Line Voltage The 7500 will operate from 85 to 264 VAC on a 50 60 Hz line voltage 3 1 2 Display Sequence After turning the power on to the 750...

Страница 25: ...nu will appear on the display The main menu is defined by the last configuration that was used This could include one of three different menus phase summation or custom The phase menu could be a repre...

Страница 26: ...Magtrol Warranty 3 2 2 Current Overload There are no fuses in the 7500 measuring circuits Therefore excessive current passed through the amps terminals will cause excessive internal heating and possi...

Страница 27: ...increases measurement accuracy by eliminating line voltage drop from the power measurement For safety an overload circuit breaker removes all load voltage during an over current condition The voltage...

Страница 28: ...number of different ways in which the unit can be wired Note The 7510 can only support a 1 phase 2 wire connection 3 3 1 1 Hardware Connections The wiring mode selections include 1 Phase 2 Wire 1 Pha...

Страница 29: ...ower W Apparent Power Vrms Arms V A Power Factor W V A Where is the phase of operation Most commonly used for single phase AC and DC motor applications The following diagrams show the connections for...

Страница 30: ...s Amps A1 A3 2 Volts V1 V3 2 Active Power W W1 W3 Apparent Power Vrms1 Arms1 Vrms3 Arms3 V1 A1 V3 A3 Power Factor W V1 A1 V3 A3 The following diagrams show the connections for a 1 Phase 3 Wire measure...

Страница 31: ...2 Volts V1 V3 2 Apparent Power 3 2 Vrms1 Arms1 Vrms3 Arms3 3 2 V1 A1 V3 A3 Active Power W W1 W3 Power Factor W 3 2 V1 A1 V3 A3 The following diagrams show the connections for a 3 Phase 3 Wire measure...

Страница 32: ...3 3 Volts V1 V2 V3 3 Active Power W W1 W2 W3 Apparent Power Vrms1 Arms1 Vrms2 Arms2 Vrms3 Arms3 V1 A1 V2 A2 V3 A3 Power Factor W V1 A1 V2 A2 V3 A3 The following diagrams show the connections for 3 Pha...

Страница 33: ...ve Power W W1 W3 Apparent Power 3 3 Vrms1 Arms1 Vrms3 Arms3 Vrms2 Arms2 3 3 V1A1 V2A2 V3A3 Power Factor W 3 3 V1 A1 V2 A2 V3 A3 Most common hookup for three phase motors The following diagrams show th...

Страница 34: ...frequency Measured Value Value Filter Square Root Selections include 1 Hz 2 Hz 5 Hz 10 Hz 20 Hz 50 Hz and 100 Hz Correlation between filter setting and response is as follows Filter Setting Response...

Страница 35: ...nuously reach above 20 amps an external sensor must be used 3 3 3 1 Hardware Connection In any of the wiring modes any one of the amp meters may be replaced The following diagram illustrates the conne...

Страница 36: ...Menu 3 Press and buttons until EXTERNAL SENSOR appears in the display 4 Press ENTER button The display will appear as follows CURRENT VOLTAGE POWER PF I 0000 I 0000 I 0000 Figure 3 20 External Sensor...

Страница 37: ...owing steps utilizing the USER MENU located on the front panel of the unit 1 Turn on the 7500 See Section 3 1 Powering Up the 7500 2 Press ENTER button The display should appear as shown in Figure 2 3...

Страница 38: ...or phase 3 press the AVG button under A3 and use the buttons in the USER MENU to adjust the value 10 To turn phase 3 scaling ON press the PEAK HOLD button under OFF until ON is reached 11 Press ENTER...

Страница 39: ...n the display 4 Press ENTER button The display will appear as follows CURRENT VOLTAGE POWER PF 1 0000 1 0000 1 0000 Figure 3 24 Volt Scaling Setup Menu 5 To set the volt scaling for phase 1 press the...

Страница 40: ...50 mV 250 mV 0 5 V and 1 V when using an external sensor and 1 A 5 A 10 A and 20 A when using amps input 4 Select voltage measurement mode DC RMS peak crest factor or peak hold a To select DC press SH...

Страница 41: ...s and release HOLD button The display will appear as follows indicating that the hold function is enabled CURRENT VOLTAGE POWER PF HOLD MODE INDICATORS Figure 3 26 Hold Mode To disable press and relea...

Страница 42: ...to present data in any format To set press SHIFT button and release then press DISPLAY The display will appear as follows CURRENT VOLTAGE POWER PF Figure 3 29 Custom Display There are 6 fields in the...

Страница 43: ...V 1 2 k 620 1 936 600 V 620 620 1 000 The signal is then presented to an AD7722AS 16 bit analog to digital converter The part accepts an input signal of 1 25 volts centered on a 2 5 VDC volt bias The...

Страница 44: ...to an AD7722AS 16 bit analog to digital converter The part accepts an input signal of 1 25 volts centered on a 2 5 VDC volt bias The chart below shows system input at 10 and 100 of range Range Amps AD...

Страница 45: ...ignal of 1 25 volts centered on a 2 5 VDC volt bias The chart below shows system input at 10 and 100 of range Range Volts In VDC Gain total Volts at A D Input Bits 50 mV 0 005 9 67500 0 0484 1268 0 05...

Страница 46: ...nd saved The amps input is read and checked for an over range condition The offset is then added to the reading and the reading is negated and saved The volt reading is checked to see if it is the pea...

Страница 47: ...cular buffer Add 2cd V buffer contents and divide by 32 Save this value Add 2cd I buffer contents and divide by 32 Save this value Add 2cd VI buffer contents and divide by 32 Save this value Each samp...

Страница 48: ...the reading is negated and saved The volt reading is checked to see if it is the peak and if so is stored The amp reading is checked to see if it is the peak and if so is stored The volt reading is s...

Страница 49: ...el 6530 Three Phase Power Analyzer Chapter 4 Operating Principles THEORY Magtrol 7500 Series Power Analyzer VOLTS vs ANGLE 100 50 0 50 100 150 200 250 0 50 100 150 200 250 300 350 volts Peak Figure 4...

Страница 50: ...combination See Section 3 3 7 3 Peak Hold The graph below shows the current draw from a 1 3 horsepower motor during initial startup At startup the current inrush peaks at about 14 amps then settles to...

Страница 51: ...oks at each complete cycle of the incoming waveform The measurements are valid from 20 Hz to 500 Hz The power analyzer may be synchronized from any of the phase volts or amps inputs the line voltage o...

Страница 52: ...l computers An interface card and driver software must be installed An IEEE 488 cable must also be installed between the computer and the 7500 Magtrol recommends National Instruments Corporation hardw...

Страница 53: ...32 bit operation system then you need 7500Vx xp inf to setup USB driver 1 Power on the 7500 A window in the right corner will show Installing device driver software 2 Click on the balloon depicted be...

Страница 54: ...lyzer Chapter 5 Computer Controlled Operation OPERATION Magtrol 7500 Series Power Analyzer 4 Locate 7500 driver msi and double click 7500 drivers msi The following window will pop up 5 Ignore the warn...

Страница 55: ...enting this technique available on the Magtrol website Download the Mag NET zip located in the downloads section of the web page This page can be found under the support menu tab 5 4 Checking the 7500...

Страница 56: ...is located in the first returned character position the input signal is within range and no changes need to be made Sections 5 4 1 through 5 4 3 contain return data format examples for the following...

Страница 57: ...5 characters Output String 1 14 measurement value float E notation ANSI 5 5 3 1 Good Response s s1 19494E 02 r n 5 5 3 2 Over Range Condition s4 94796E 01 r n 5 6 Programming Note Check the manual pro...

Страница 58: ...ized error information will be returned Please see Appendix C for detailed explanations Note Terminator is not available on the Ethernet connection 5 7 1 Commands Command Code Function Explanation IDN...

Страница 59: ...has configured to return MEAS DISPLAY Retrieves displayed values of current voltage and power format as the OE command in average mode MEAS FREQ Returns the current output frequency MEAS PHASE phase...

Страница 60: ...rent configuration can be read by replacing the parameter with a question mark Example CONF FILTER will return the current filter setting Command Code Function Explanation CONF AMPS phase range Sets a...

Страница 61: ...uts for phase are 0 all phases 1 phase 1 2 phase 2 3 phase 3 RMS DC indicates measurement mode Valid inputs for RMS DC are Returns the current phases setting 0 RMS AC and DC 1 DC CONF FREQSRC source S...

Страница 62: ...ent setting 0 20 A 1 10 A 2 5 A 3 1 A 4 1 V ext sensor input range 5 500 mV ext sensor input range 6 250 mV ext sensor input range 7 50 mV ext sensor input range CONF ISCALE phase scale Sets the amps...

Страница 63: ...measurement mode is continuous or cyclic Valid values for type are return the current mode 0 continuous 1 cycle by cycle CONF EXTISCALE phase scale Sets the external sensor scaling constant phase indi...

Страница 64: ...DHCP 1 Enables DHCP Tells the current state Returns OK COMM GATEWAY xxx xxx xxx xxx Sets the current gateway address used You must send the COMM UPDATE command after changing the gateway for the new s...

Страница 65: ...Parameters Returns OK or error if the update cannot be completed 5 8 web interface operation Use the Ethernet cable to connect the 7500 to a switch a router or a wall outlet To access the web interfa...

Страница 66: ...equal to 0 the unit assumes zero calibration is requested and zero amps are on input When m2 is greater than 0 the unit assumes gain calibration is requested and m2 amps are on input CVm1 m2 terminat...

Страница 67: ...nal input connections 3 Connect the amps and volts 4 Turn the power ON Set the 7500 device in calibration mode by the following command code BCAL1 5 Set volt and amp range by entering the following co...

Страница 68: ...voltage 13 Set amp range by entering the following command code AMPS RA m2 where m2 4 to 7 14 Set calibrator to 0 volts DC Note DC is used for zero 15 Enter the following command AMPS CA0 0 16 Set ca...

Страница 69: ...tion No GPIB communication Setup error and or hardware fault Check GPIB address of power analyzer GPIB cable should be functioning and attached to power analyzer and computer interface card No USB com...

Страница 70: ...60 appendices Appendix A Schematics A 1 block diagram...

Страница 71: ...or manual range mode for the amps ranges m1 indicates the input phase Values for m1 are 0 all phases 1 phase 1 2 phase 2 3 phase 3 m2 indicates whether range mode is auto or manual Values for m2 are...

Страница 72: ...RMS AC DC 1 DC MCm terminator Sets the continuous or cyclic measurement mode filter m indicates whether the measurement mode is continuous or cyclic Values for m are 0 continuous 1 cycle by cycle MFm...

Страница 73: ...Sets the voltage scaling constant potential transformer m1 indicates the input phase Values for m1 are 0 all phases 1 phase 1 2 phase 2 3 phase 3 m2 indicates the voltage scaling constant in V V and m...

Страница 74: ...hase 2 3 phase 3 m2 indicates the measurement value Values for m2 are 0 normal RMS DC depending on measurement mode setting 1 peak instantaneous 2 crest factor 3 peak hold inrush RMS DC OWm1 m2 termin...

Страница 75: ...When the number of parameters given is not what is expected ERR INVALID PARAMETER When a parameter given is not an excepted value for the Command ERR UNKNOWN Covers various situations and helps to ide...

Страница 76: ...ment a quotation listing all the necessary parts and labor costs if any will be faxed or e mailed to you 6 After receiving your repair estimate provide Magtrol with a P O number as soon as possible A...

Страница 77: ...ardenville Parkway Buffalo New York 14224 USA Phone 1 716 668 5555 Fax 1 716 668 8705 E mail magtrol magtrol com Magtrol SA Route de Montena 77 1728 Rossens Fribourg Switzerland Phone 41 0 26 407 3000...

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