Accu-Trans - Vanguard Instruments Company, Inc.
Contents
1. WO OO ou OG U Idest Y 192 Es HACIA SINO AIRS AIS 2 A ES ON TENG Bus AO 20 d ALO Ie Y Lnd OL o D Gimi E AR SED IIA MA xe OL 14 129364 022 14 AO d Lo Dr COPA der Ly is nam zt RIWAN OL Sl E Hn A Mercy A H DI 593 1034 L8 13804 BA 33 Wash aen 1 SALON SOLO LOHS E MOLI O TVt i MOLIS NO Te JL AMO Md ane MOLI SOROS Trans Operation VERO IE DIOS OA DN PTE ummmiascass k s Jog Ta OL TIUS 2 Mari OMI Mais I en III RL jMBd E 034088 1831 TOYS HN OLOT DIU A E 7 DIN III TIT pel Le 2 HOLT 1 30881 Ob 00533 OO wards Jw lx t CANES SIL Br Waves J diwurwue 4 0 Summary of Step by Step Accu on Gans 18391 eat OM OWS SPU 03 oa nn P771 AN t 4 UL As aan tom in wp LO di E m ZWEI EM OL ed 18 Lie vais OHSAS wu c Fa arva ID 2t Cueva S83 WOO ld HA LEAL Mit iga i DINSIN ALNG 13 15 3 gt ya 3 aa a asa YSN wuoj oumuo y 4 P ou 09 jueuinajsu paenBueA Per hadr SHWW1INIOVW Figure IY E Accu Trans Operating Procedures 6 2 Step by Step Procedures at Start Up Menu 6 2 1 START UP Menu Observe that the Start Up menu displays as shown below 1 TEST XFMR 2 SETUP 04 15 01 09 28 03 a Press key 1 to start test Press 2 to select other options i e enter record identification data recall test results etc 6 2 2 Test Transformer Procedure The following proce2. Operating Procedures switch generates large reactive voltage spikes that are hazardous and exceed the switch s voltage ratings thus causing irreparable damage By connecting the Accu Trans continuity test input across the switching input and running the regulator switch through all the contacts in it s range any breaks in continuity caused by faulty tap switching are detected a Torun the Voltage Regulator test perform the following step by step sequence starting with the STARTUP MENU see below 1 TEST XFMR 2 SETUP 08 14 01 12 21 01 b Press key 2 SETUP to produce the SETUP MENU see below 1 ENTER XFMR ID 2 REVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE c Press key 4 NEXT PAGE to produce the next menu of test options see next display 1 COMPUTER CONTROL 2 SET TIME 3 ENABLE TEST MODES 4 VOLTAGE REG TEST d Connect Accu Trans input to the regulating tap switch input Press key 4 VOLTAGE REG TEST to start the regulator test high voltage advisory notice displays see following WARNING rears DANGEROUS FLASH OVER MAY OCCUR IF CABLES ARE DISCONNECTED e Press ENTER key for next display see below VOLTAGE REG TEST START TO RUN TEST or STOP TO ABORT f Press START key to run the voltage regulator tap switch test The test begins as the magnetic field in the transformer ramps up to a stable plateau with the advisory that t
3. 1 to print the entire directory step The following menu displays of test records Press key 2 to print the short directory i ar a lin A short directory lists the last 20 test records 3 ERASE RECORD stored in the Accu Trans memory s This ends the print directory sequence b Press key 2 DIRECTORY and go to the next step The menu below displays PRINT DIRECTORY 1 FULL DIRECTORY 2 SHORT DIRECTORY 16 Accu Trans STATION CIRCUIT MFR MODEL S N STATION CIRCUIT MPR MODEL S N STATION CIRCUIT MER MODEL S N STATION CIRCUIT MFR MODEL SN RECORD NUMBER 3 DATE TIME 07707701 NUMBER OF TESTS RECORD NUMBER DATE TIME 07 07 01 NUMBER OF TESTS 3 RECORD NUMBER 1 DATE TIME 07707701 NUMBER OF TESTS 2 TEST DIRECTORY RECORD NUMBER 4 DATE TIME 08 13 01 08 2 NUMBER OF TESTS 4 4 15 13 14 Operating Procedures Figure 6 0 Typical Record Directory Printout 6 3 5 Erase Recording Procedure The Erase Recording sequence begins with the Set Up Menu shown below Go to the next step 1 ENTER XFMR ID 2 PREVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE ERASE RECORD 1 ERASE SINGLE REC 2 ERASE ALL RECORDS c To erase a single a record press key 1 a Press 3 RESTORE RECORD and go to the next step The display below appears to erase all records press key 2 If a sin
4. ERASE RECORDING PROCEDURE teet tnd 17 6 3 6 ENABLING COMPUTER INTERFACE eee 18 6 3 7 SETTING DATE AND TIME si eite etu cede e 18 6 3 8 ENABLE PASSIVE TEST MODE eerte tette tete 19 6 3 9 VOLTAGE REGULATOR TEST eerte tette tette teen 19 Accu Trans Operating Procedures Table of Figure Figure 1 0 Figure 2 0 Figure 3 0 Figure 4 0 Figure 5 0 Figure 6 0 Accu Trans Controls and Indicators edo a da 5 9010 130 Vae Jumper Settrp acc pi obe biet end eee etie td 7 2T0 t0 240 Vac T inper Setting rios 7 Summary of Step by Step Accu Trans Operation uussesssersnnesnnernnnennnersneenennnnen en 9 Typical Test Report PEIBIOUL ooo EE o a ene 12 Typical Record Directory Printouts oisi nobi toto p tue tuuc 17 Accu Trans Operating Procedures 1 0 INTRODUCTION 11 Applicability This manual applies to a second generation Accu Trans Series Il henceforth called the Accu Trans part number VIC 80000 S2 manufactured by the Vanguard Instruments Co A prior manual supports a first generation Accu Trans 1 e a Series I configuration 1 2 Supersedure Notice This Operator s manual is the basic issue for the Accu Trans and does not supersede any previously published manual 13 General Description Vanguard Instruments Company produces the Accu Trans a microprocessor controlled winding resistance meter that measures low resistances of a transformer s induc
5. The OPERTOR screen displays OPERATOR h Enter the characters needed to identify the operator who is performing the tests This completes entries for the transformer identification data Press ENTER key to enter the selected data the program returns to the START UP MENU 6 3 2 Review Test Records Procedure This procedure describes steps to review a test record residing in Accu Trans working memory The user can view the record on the LCD display or from a thermal printout model number then press ENTER key and Accu Trans Operating Procedures NOTE To review a test record stored in Flash EEPROM the user must first restore test record from Flash EEPROM to working memory see paragraph 6 3 3 These procedural steps begin by selecting SETUP on the Start Up Menu which displays the Set Up Menu shown below 1 ENTER XFMR ID 2 REVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE a In the Set Up Menu see above press 2 to select the REVIEW RECORD procedure It starts with the display shown below Go to the next step REVIEW RECORD 1 SCROLL TEST RECORD 2 PRINT TEST RECORD b Press 1 SCROLL TEST RECORD to view all the test records in memory see menu above c Press 2 PRINT TEST RECORDS to output test record to the thermal printer See Fig 5 0 for typical test record printout d Pressing the 1 key SCROLL TEST RECORD produces the RECORD ID INFO display This menu displays t
6. 1 to 4 When key 4 NEXT PAGE is selected More choices for setup menu are shown below 1 COMPUTER CONTROL 2 SET TIME 3 ENABLE TEST MODE 4 VOLTAGE REG TEST Accu Trans Operating Procedures REC NUMBER 1 TEST RESULTS COMPANY STATION CIRCUIT MFR MODEL S N KVA RATING OPERATOR ACTIVE TEST 11 012 OHMS TEST CURRENT 0 616 AMPS TAP WINDING ACTIVE TEST 122 87 MILLI 0HMS TEST CURRENT 2 000 AMPS TAP WINDING Figure 5 0 Typical Test Report Printout 6 3 1 Transformer ID Entries as the key continues to be pressed The The operator can enter test data using the characters selected are entered at the following procedures position of the cursor Pressing the up key A advances the cursor by one OPERATOR S NOTE Test Identification data are entered with the keypad item 2 of Figure 1 0 The keypad has 10 keys that are alpha numerically marked like pushbuttons on a telephone Keys are pressed for each character position marked by the cursor in the identification area thus If for example we consider the key marked 2 A B C the first press of the key selects the number 2 pressing the key a second time selects the letter A pressing the key a third time selects the letter B and pressing the key a fourth time selects the letter C Further pressing of the key returns to the number selection the cycle repeats 12 sp
7. 120 0 MICRO OHM e Press ENTER key and go to the next step The print option menu is now displayed PRINT TEST RESULTS 1 YES 2 NO f Press key 1 to print test results Typical Accu Trans test report is shown in figure 5 g Select key 2 to bypass printing results Accu Trans Operating Procedures h When either option is selected the next window displays with the prompt KEEP THIS READING Go to the next step KEEP THIS READING 1 YES 2 NO i If the KEEP THIS READING prompt is answered with a YES the following display appears j Goto step 1 If NO is selected the next display is skipped and the second display following appears TEST SAVED The TEST SAVED display advises that the resistance measurement has been saved k Press ENTER and go to the next step RUN ANOTHER TEST message will appears D Select NO from KEEP THIS RESULTS will take the user to the RUN ANOTHER TEST menu RUN ANOTHER TEST 1 YES 2 NO 11 m At the RUN ANOTHER TEST Menu the operator may choose to run another test by selecting YES Return to step 6 2 2 a to run test n If NO is selected i e don t run another test the program returns to the Start Up Menu section 6 2 1 6 3 SETUP Menu This menu is displayed by again selecting 2 SETUP on the Start UP MENU 1 ENTER XFMR DATA 2 REVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE a Select key
8. DAMAGE Vanguard Instruments Co Inc TM Ontario California USA Figure 1 0 Accu Trans Controls and Indicators Accu Trans Operating Procedures Table 1 0 Functional Descriptions of Accu Trans Controls and Indicators Panel Markings Functional Descriptions RS 232C Not titled 16 key pad Not titled LCD 120 240 2A 50 60 Hz Fuse 250 Vac 3A Slow Blow Not titled thermal printer HIGH CURRENT PRESENT Not titled test lead jacks Computer interface port 9 pin connector female DB type The data are set to 19 200 baud 1 start bit 2 stop bits 8 data bits and no parity bit PIN SIGNAL 2 Rx 3 Tx Signal Gnd Pushbutton operating controls 10 key pad plus START STOP ENTER CLEAR two paper drive buttons number keys 2 thru 9 have dual functions as letter entries a la telephone dialer key pad Liquid Crystal Display 4 line by 20 character back lighted and readable in sunlight Displays menus user selections status readouts and test results Input power connector with third wire safety ground ON 1 OFF 0 rocker toggle switch has built in fuse protection Stud 5 16 18 thread with hand turned wing nut Safety Ground This must be connected to station ground before connecting cables to transformer and begin testing Built in thermal printer prints test results in the field on 2 5 inch wide paper NOTE For best high contrast print quality it is recommended that only VIC t
9. possible hazard Avoid Contact With High Voltage Kicks Any transformer with many windings turns and an iron core supports induced magnetic fields such that even low level test currents produce a magnetic field that if interrupted can produce a high voltage spike capable of causing severe injury or death Accordingly its important for personnel safety that test leads be securely attached to the transformer terminals to prevent their being accidentally disconnected during testing All personnel are warned to stand clear of the transformer during all testing Test technicians should always ensure that all non technical personnel who may not understand the hazards be required to stand clear of all transformers and equipment during all phases of transformer testing Do Not Modify Test Equipment Because of the added risk of introducing additional or unknown hazards do not install substitute parts or perform any unauthorized modification to the Accu Trans To ensure all designed safety features are maintained it is recommended that all Accu Trans repairs be performed at Vanguard Instruments Co or by an authorized repair service Unauthorized equipment modifications can create safety hazards and will void the Accu Trans warranty Follow Exact Operating Procedures Any deviation from the operating procedures described in this manual may create one or more safety hazards damage the unit or cause test result errors Vanguard In
10. unknown resistance typically a circuit breaker s contacts The value of the unknown resistance under test is the direct function of the measured voltage divided by the current and being calculated by the microprocessor Resistance reading is then displayed on a back lighted 4 line by 20 character LCD The Accu Trans 48V dc power supply applies up to 2 amperes test current to the device under test Accu Trans voltmeter test leads are run separately from the current bearing test leads to the resistive load thus voltages are measured at the terminals of the resistance being measured eliminating error from the I R voltage drop in the test current cables The Accu Trans makes precise micro ohm measurements possible without calculating compensation for test current lead resistance errors A built in discharge circuit automatically discharges the energy stored in the transformer at the end of each test 1 5 Furnished Accessories The Accu Trans is shipped with two 45 foot test cables with quick disconnect type test plugs on the unit end and battery type clamps at the test load end One power cord one ground cable and a cable carrying bag Accu Trans Operating Procedures 2 0 ACCU TRANS SPECIFICATIONS Table 1 ACCU TRANS SPECIFICATIONS TYPE SIZE inches WEIGHT RESISTANCE TEST CURRENT DISPLAY PRINTER ACCURACY POWER SERIAL INTERFACE ENVIRONMENT WARRANTY NOTE Special purpose test equipment po
11. ECORDING that the selected record has been restored which shows a menu for three main procedures as displayed below Go to next e When the restoration is confirmed press step ENTER key to select the viewing option as shown below 1 RESTORE RECORD REVIEW RECORD 2 DIRECTORY 3 ERASE RECORDS 1 SCROLL TEST RECORD 4 NEXT PAGE 2 PRINT TEST RECORD b Press key 1 RESTORE RECORD to f If the user wants to scroll through the begin the procedure The next display test record press key 1 and continue from appears Go to the next step step 6 3 2 b i Press key 2 will produce a test record RESTORE RECORD print out on the thermal printer See figure 5 0 for a typical test record printout 1 ENTER RECORD NUMBER 2 SCROLL TO SELECT 6 3 4 Printing Test Record Directory Printing the test record directory begins with c Press 1 ENTER RECORD the Set Up Menu shown below the same NUMBER to produce the Restore Record display from which the Review Records display as shown below Go to next step steps began RESTORE RECORD 1 ENTER XFMR ID NUMBER 2 PREVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE The above display prompts the operator to enter the record number d When the record number is displayed press ENTER and go to the next step The next display will appear 15 Accu Trans Operating Procedures a Press key 3 to select the Restore Recording step sequence and go to the next c Press key
12. OPERATING INSTRUCTIONS for the ACCU TRANS TRANSFORMER WINDING RESISTANCE METER Series Il Part Number VIC 8000 S2 AY Vanguard Instruments Company 1710 Grevillea Court Ontario California 91761 TEL 909 923 9390 July 2001 FAX 909 923 9391 Rev 0 Accu Trans Operating Procedures SAFETY SUMMARY The following safety precautions must be observed during all phases of test set up test hookups testing and test lead disconnects Do Not Service or Test Alone Do not perform test procedures or service unless another person is also present who is capable of rendering aid and resuscitation Avoid Contact with High Voltage Because electric utility station environments contain high voltages and currents there s always the possibility of personal contact with an unexpected lethal voltages generated by magnetically induced and or electrostatic leakage from nearby live circuitry When test units are connected to de energized dead lines regardless of how short these lines may be always discharge the lines before attaching test lead Because of the possibly deadly consequences of physical contact with such lines engineers and technicians must always treat electrical equipment and hookups as though a lethal condition will eventually occur Therefore no matter how unlikely it may be never assume anything about the safety of any test setup Ensure the safety of personal by checking first hand to eliminate every
13. ace pressing the down key v moves the cursor back one space If a character is erroneously entered select the new key to get the correct entry The first Identification ID display is the COMPANY screen which is shown below COMPANY a Enter the characters of the utility company s name When this is done press Accu Trans Operating Procedures ENTER key and go to the next step The STATION screen will then be displayed STATION b Enter characters for naming the station where the transformer to be tested is located When all the characters are selected or identifying the station press ENTER key and go to the next step The CIRCUIT screen displays CIRCUIT c Enter all characters needed to identify the circuit name then press ENTER key and go to the next step The manufacturer screen displays MANUFACTURER d Enter all characters needed to identify the manufacturer of the transformer being tested then press ENTER key and go to the next step The MODEL screen displays MODEL e Enter the characters of the transformer s go to the next step The SERIAL NUMBER screen displays SERIAL NUMBER f Enter the alpha numeric characters needed to identify the serial number then press ENTER key and go to the next step The KVA RATING screen displays KVA RATING g Enter the numbers to identify the KVA rating for the transformer being tested then press ENTER key and go to the next step
14. any Inc 1710 Grevillea Court Ontario CA 91761 USA Phone 909 923 9390 Fax 909 923 9391 Website http www vanguard instruments com CA ACCU TRANS 09 09 01 OAK
15. dure shows the steps to get a resistance reading from a device under test a To start a test press key 1 TEST XFMR from main menu When the test mode is selected a WARNING display is shown below FAN ARNING Jte DANGEROUS FLASH OVER MAY OCCUR IF CABLES ARE DISCONNECTED This warning reminds operators that the next sequence of test steps will run current through the load which if inductive will cause lethal voltages to be generated if the cables are disconnected before the current is ramped down to zero b Press the ENTER key and proceed to the next step The start test display appears Press the START key to Start test The test in progress display appears below TEST IN PROGRESS PLEASE WAIT XFMR CHARGING This display doesn t prompt any action but simply reminds the user that a test is in progress The time for this display depends on size of the winding s inductance and the test mode selected The Accu Trans determines when the resistance reading is stable and shows resistance value on LCD as follows MEASURED RESISTANCE STOP TO ACCEPT 120 0 MICRO OHM The Accu Trans continues to apply the test voltage on the transformer s winding and updates the resistance value on the display d The user presses STOP key to retain this data and go to the next step If the displayed data is not O K press CLEAR to return to the Start Up Menu MEASURED RESISTANCE FINAL RESISTANCE
16. gle recording is selected go to the next step The prompt below displays To erase all recordings go to step f 1 RESTORE RECORD 2 DIRECTORY 3 ERASE RECORD ERASE RECORD NUMBER b Press 3 ERASE RECORD and go to next display 17 Accu Trans Operating Procedures d Enter the number of the record that is to be erased and press ENTER key Go to the next step The confirmation display appears as shown below RECORD NUMBER ERASED e When the erased record number is confirmed press ENTER key to return to the start Up Menu ending the sequence for erasing a single record f When key 2 ERASE ALL RECORDS is pressed in the Erase Record display back in step c the following prompt displays Go to the next step ERASE ALL RECORDS ARE YOU SURE ENTER TO CONTINUE g Press ENTER key to erase all test records If ERASE ALL RECORDS was mistakenly selected press STOP to abort the erase process and return to the Start Up menu When ENTER key is pressed the following confirmation message is displayed Press ENTER key to return to the Start Up Menue RECORD ERASED This ends the Erase Record s sequence 6 3 6 Enabling Computer Interface The Computer Interface Mode allows the user to retrieve test records stored in the Acccu Trans memory via the RS 232C port An IBM PC program is provided with each Accu Trans allowing the user using his PC to retrieve these tes
17. he information related to the test RECORD ID INFO e To scroll through the test records in memory press the UP A key to roll up or press the down v key to roll down through the saved test records The next menu displays the number of test in the record time and date of the test There are 2 tests in the test record below 2 TESTS 06 12 01 12 21 34 f Press the UP A key to review the resistance measured in the first test which show in the following display TEST NUMBER 1 ACTIVE TEST 10 88 OHM AT 0 824 Amps g Press the UP 1 key again to display the second test on the record as shown below TEST NUMBER 2 ACTIVE TEST 122 8 MILLI OHMs AT 2 000 Amps h When the operator has reviewed the test measurement for the selected record in the display above press STOP to return to the Start Up Menu This ends the steps for reviewing saved test records 6 3 3 Restore Recording Procedures This procedure allows the user to restore a test record from the Accu Trans Flash EEPROM to working memory The user can then review the test record using the REVIEW RECORD command 6 3 2 The Restore Recording Procedure steps begin at the Set Up Menu shown next Accu Trans Operating Procedures RECORD RESTORED 1 ENTER XFMR ID 2 REVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE a To begin the Restore Recording steps The above display confirms to the operator press key 3 RESTORE R
18. he transformer is charging the red High voltage warning indicator lights When the transformer current stabilizes the following prompt displays see below VOLTAGE REG TEST CURRENT RAMP xx XFMR CHARGING No operator action required when transformer current ramps nears a flat plateau the run tap switch prompt displays see below VOLTAGE REG TEST RUN TAP CHANGER NOW STOP TO EXIT TEST XFMR CHARGING If no transient is detected as taps are switching the display above will remain Press STOP to end the voltage regulator test Accu Trans If a switch break is detected an advisory displays shown below Press STOP to end the voltage regulator test TRANSIENT DETECTED 21 Operating Procedures Accu Trans Operating Procedures APPENDIX A ACCU TRANS Troubleshooting Guide Symptom Possible Problem Reading is incorrect 1 Poor connection at the 1 Check connection to make sure Clips sensing and current teeth are 2 Broken sensing lead touching the device under test DUT 2 Inspect sensing cables No Test Current 1 No test current going 1 Check Connection to DUT Current read zero through DUT 2 Run Calibration Test and resistance 2 Drive circuit not reading 0 working Have test current but 1 Broken sense leads 1 Inspect sense leads resistance reading 2 Reverse sense leads 0 NOTE DUT Device Under Test Vanguard Instruments Comp
19. hermal paper be used LED indicator light red When lighted this indicator warns operators that there is a possibility that lethal high voltage will exist if any test lead is disconnected while current is running through an inductive load Failure to heed this warning can result in shock and or fatal injury to personnel Test connector jacks female for connecting heavy gauge current leads and voltage sensing test leads Plug in voltage plugs are not polarity sensitive but must be plugged into the jacks adjacent to their companion current jacks Accu Trans Operating Procedures 4 0 PRETEST SETUP 4 1 Operating Voltages by the placement of jumpers on the power The Accu Trans operating voltages are terminal block as listed in Table 2 0 below selectable between 90 130Vac 50 60Hz or and Figures 2 0 and 3 0 200 240 50 60Hz Voltage selection is set Table 2 0 Voltage Selection VOLTAGE SELECTION TERMINAL BLOCK JUMPERS 90 130Vac Brown to Blue amp Yellow to Green 200 240Vac Blue to Yellow 120Vac Jumper Installation 220Vac Jumper Installation Figure 3 0 210 to 240Vac Jumper Setting Accu Trans Operating Procedures 4 2 Accu Trans LCD Contrast Control To darken the LCD display press and hold the Paper A Contrast switch for two seconds to lighten the LCD display press and hold the Paper v Contrast switch for two seconds 4 3 Accu Trans Printer Paper Control To advance the Accu Trans
20. ing conducted during any test Failure to heed this warning can result in lethal electrical shock to personnel and or damage to equipment 6 1 General Procedures a Ground Accu Trans to substation ground item 5 in Figure 1 0 b Plug Accu Trans power cable into a power outlet Insert current cable plugs and voltage sensing cable plugs into respective control panel jacks index 8 of Figure 1 0 Ensure that voltage plugs are plugged into jacks that are adjacent to companion current jacks d Attach test cable clamps to transformer terminals of winding that is to be measured or if load is not an inductance simply attach test leads to opposite terminals of the resistive load e Tum on Accu Trans power item 4 in Figure 1 by pressing T on rocker switch f Observe that after configuration data is displayed briefly then the start up menu displays with selection options for 1 RUN TEST 2 SETUP Operating Procedures Accu Trans ATA Ane IO aaa S300w 1831314 A FAL we 3 831 5N 17 1 oHm anum PITA drr uvis CUMBIA DiS e E veuastyisci enim SEA bhd Ua PAOD Mod QW DI DU LON d SALA SY EDO REE ELE Une d nesu anumis SHUE OL emu ASIEN Lee NS E Dinen mu TP NOA UY anm last ans V SONO OM TI SER Dido Mart I IICA TAROT BONDE Om MO abs ZU DEUS LE MEMO M TOA ANA OC OTRA C NU ILC Vi LITE OLINU AHLY THB OLS OBEN DL Wn 1594 We TROL SONO S del
21. printer paper press and release the Paper Contrast switch To retract the Accu Trans printer paper press and release the Paper v Contrast switch 5 0 ACCU TRANS PRINTER PAPER The Accu Trans built in thermal printer uses 2 5 inch wide thermal paper for printing test results To maintain the highest quality test result printing and to avoid paper jamming the use of paper supplied by our factory is highly recommended Additional paper can be ordered from either of the two sources listed below Vanguard Instruments Co Inc 1710 Grevillea Court Ontario CA 91761 Tel 909 923 9390 Fax 909 923 9391 Part Number TP 3 Paper OR BG Instrument Co 13607 E Trent Avenue Spokane WA 99216 Tel 509 893 9881 Fax 509 893 9803 Part Number TP 3 paper 6 0 OPERATING PROCEDURES Before using the Accu Trans for measuring any resistance operators should review the Summary of Step by Step Operation of the Accu Trans found in Figure 4 0 Accu Trans operations are simple requiring the selection of choices from the display menus and responding to the displayed prompts However first time operators should review Figure 1 0 to become familiar with the total Accu Trans operation and the logical branching for various test options More experienced operators may use this figure as a handy help and reference guide WARNING Do not touch or disconnect any test lead that is connected to a transformer terminal while high current is be
22. rtable micro ohmmeter 16 8 wide by 12 6 high by 10 6 deep Less than 21 pounds 1 micro ohm to 200 ohms 2 amperes max LCD back lighted 4 line by 20 character 2 5 inch wide thermal printer 1 reading 1 count 2 amps 90 120 200 240 V ac selectable 50 60 Hz RS 232C connector port Operating 0 C to 55 C Storage 40 C to 65 C One year parts amp labor post warranty service is available THE ABOVE SPECIFICATIONS ARE VALID AT NOMINAL OPERATING VOLTAGE AND AT A TEMPERATURE OF 28 C 77 F ACCU TRANS SPECIFICATIONS MAY BE UPGRADED AND CHANGED WITHOUT PRIOR NOTICE Accu Trans Operating Procedures 3 0 CONTROLS AND INDICATORS control panel The purpose of the controls See Figure 1 and refer to Table 1 and indicators may seem obvious but users Accu Trans controls and indicators are should become familiar with them before shown in Figure 1 0 A leader line with an using the Accu Trans Accidental misuse of index number points to each control and the controls will usually cause no serious indicator which is cross referenced to a harm Users should also be familiar with the functional description in Table 2 This table Safety Summary found on the front page of describes the function of each item on the this operator s manual ACCUTRANS Transformer Winding Resistance Meter DONCT TOVC On AUDI TRANSFORMER TEST CAULES DURING TESTING FARUNE TO SOCO THis WAPA IG OAN CAUSE LETHAL SOCS AMO COWPHEMT
23. struments Co assumes no liability for unsafe or improper use of the Accu Trans Accu Trans Operating Procedures Table of Contents SAEBTY SUMMARY AA f cM x c ME he xac Oe MI E I LU TIN TRODUCITION era da e AM ae 3 AA N nee este 3 1922 SUPBPSEDURE NOTICE 2 2 5 0 4 212200 ae eo ada 3 1 2 GENERAL DESCRIPTION rn nen ea ek 3 14 FUNCTIONAL DESCRIPTION cido 3 1 5 FURNISHED ACCESSORIES 00 sidad 3 2 0 ACCU TRANS SPECIFICATIONS eerte tette tette tette tree tenete 4 3 0 CONTROLS and INDICATORS eerte tette tette teens etos 5 AO PRETEST SETUP ostensae tutus eibi studs oro Latet ie ud 7 AT OPERATING VOL PAGES een lit 7 4 2 ACCU TRANS LCD CONTRAST CONTROL ettet teen 8 4 3 ACCU TRANS PRINTER PAPER CONTROL 8 5 0 ACCU TRANS PRINTER PAPER eterne tette tette tete tinet 8 6 0 OPERATING PROCEDURES teet tette tnter totes tires 8 6 1 GENERAL PROCEDURES eene tette ttt tet teretes tns 8 6 2 STEP BY STEP PROCEDURES AT START UP MENU eene 10 621 STARTUP MENUS 2 4 2258 cabos Ou tate E iuc dune sce Rer AM er Mae 10 6 2 2 TEST TRANSFORMER PROCEDURE teret tent 10 62 SEDUPMEN Sed ei dit e LEM do aa e E C IU ELEM 11 6 3 1 TRANSFORMER ID ENTRIES eerte tette tette teet 12 6 3 REVIEW TEST RECORDS PROCEDURE eerte teet nnn 13 6 3 3 RESTORE RECORDING PROCEDURES eerte tent 14 6 3 4 PRINTING TEST RECORD DIRECTORY 15 6 3 5
24. t records a This procedure begins in the Set Up Menu shown below Go to the next step 1 ENTER XFMR ID 2 REVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE b Pressing key 4 NEXT PAGE and the menu below appears Go to the next step 1 COMPUTER CONTROL 2 SET TIME 3 ENABLE TEST MODES c Press key 1 COMPUTER CONTROL and go to the next step The display below appears COMPUTER ITF MODE j Pressing the STOP key terminates the computer control at which time the Start Up Menu displays ending this step sequence 6 3 7 Setting Date and Time The date and time set begins at the Set Up Menu shown below 1 ENTER XFMR ID 2 REVIEW RECORD 3 RESTORE RECORD 4 NEXT PAGE Accu Trans Operating Procedures a Begin the date and time set by pressing a This procedure begins in the Set Up key 4 NEXT PAGE and going to the Menu shown below Go to the next step next step The menu below appears Go to the next step 1 ENTER XFMR ID 2 REVIEW RECORD 1 COMPUTER CONTROL 2 SET TIME 3 RESTORE RECORD 4 NEXT PAGE 3 ENABLE TEST MODE b Pressing key 4 NEXT PAGE and the b Press key 2 SET TIME and go to the menu below appears next step The display below appears ENTER 1 COMPUTER CONTROL 2 SET TIME MM DD YY HH MM SS 3 ENABLE TEST MODES c Enter the date and time which appear in c Press key 3 to activate PASSIVE Test the dashed line areas then press ENTER mode ke
25. tive windings in a range from 1 micro ohm to 200 ohms with very high accuracy This instrument can also measure any low milliohm resistance e g the contact resistance of a circuit breaker This Accu Trans is simple to use it features keypad controls and an alpha numeric display of the measured resistance test current and operator entered test parameters and identifying data The Accu Trans uses a 48 volt dc power supply and a special current regulator to quickly measure transformer winding resistances A typical single phase 400MVA transformer winding resistance can be measured in less than 3 minutes To ensure operator safety the Accu Trans automatically discharges the energy stored in the transformer at the end of each test A built in thermal printer prints test results on 2 5 inch wide thermal paper Resistance and test current display on a 4 line by 20 character back lighted LCD Up to 63 records 96 readings each can be stored in the Accu Trans FLASH EEPROM The user can recall stored reports for printing A RS 232C serial interface port is provided for diagnostic testing and down loading test records The Accu Trans is field portable rugged it features simple easy operation by first time users with little training 14 Functional Description The Accu Trans s operation is based on the electrical relationships described by Ohm s law R V L where I is a known current and V 1s the dc voltage measured across the
26. y to set the calendar and clock and return to the Start UP Menu This ends the Set Note Time step sequence Once the PASSIVE test mode is 6 3 8 Enable Passive Test Mode selected the Accu Trans will display the Operators have a choice between two test test mode selection menu shown below modes ACTIVE or PASSIVE Normally in step 6 2 2 a after the user presses key the ACTIVE test mode is best suited for 1 TEST XFMR quickly testing transformer resistances In this mode the Accu Trans automatically ramps the test current up to its final test value when the magnetic field is saturated in the shortest possible time However in a very large inductive load the ACTIVE test mode reading may appear to be unstable 1 ACTIVE TEST 2 PASSIVE TEST In this situation the user may want to try the 6 3 9 Voltage Regulator Test PASSIVE test mode test In this mode the Accu Trans will take longer to provide a Note reading however the reading is more stable This test verifies that a regulating switch in a primary voltage tap Note regulator changes contacts through its The Accu Trans always defaults to the selection range with no break in the ACTIVE test mode when power is first circuit i e it checks the tap switch s applied to the unit The user needs to enable make before break This test is the PASSIVE test mode before using it important because in actual use any breaks in current in a regulating tap 19 Accu Trans
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