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To summarize, inductance values can be used to determine hard shorts in some motor

windings, but not all. Knowledge of the windings is important before passing judgment on a

winding’s integrity.
Example: the inductance of a GE 350HP 1750RPM 7kV stator with a short was measured at

60Hz and 1000Hz. The data is shown below:

Table 1.

OD #2 at 60Hz inductance.

L(%)

Phase

L1-L2

168.38

1.30063

0.994

63.79

84.32

L2-L3

170.57

0.184675

0.075

64.48

85.7

L3-L1

170.255

1.101289

0.0839

64.41

85.206

Table 2.

OD #2 at 60Hz inductance.

L(%)

Phase

L1-L2

167.75

1.675112

0.0206

985.117

88.8

L2-L3

170.56

2.884615

0.009

1071.73

89.5

L3-L1

165.64

1.273847

0.0128

1040.86

89.26

The bar chart below shows the percentage “change” in inductance between phases of this

wye-connected motor. Along with the inductance percentage values, the line-to-line error

area ratio (EAR) surge test values for the same motor are also shown.

Figure 113.

Percentage “change” in inductance between wye-connected motor phases.

Clearly, there is a change in inductance that is measurable for the stator with a short. The

change shows up in inductance measurements at both 60Hz and 1000Hz. It is also clear

from this chart that there is a much greater change in L-L EAR values of the stator with the

surge test, making the surge test a much more sensitive method for finding turn shorts in

windings.

116

SKF Static Motor Analyzer—Baker AWA-IV User Manual

Motor testing theory and reference

Содержание AWAIV-12

Страница 1: ...SKF Static Motor Analyzer Baker AWA IV User manual ...

Страница 2: ......

Страница 3: ...adiate radio frequency energy and if not installed and used in accordance with the product manual could cause harmful interference to radio communications If this equipment does cause harmful interference the user will be required to correct the interference Due to the phenomena being observed and the material properties being measured this equipment radiates radio frequency energy while in the ac...

Страница 4: ...eleases to the User License The license granted permits the User to do only the following 1 Use the test equipment version on only the SKF test equipment provided 2 Use the desktop version on only a single approved computer The list of approved computers is available upon request and only in conjunction with the SKF test equipment 3 Use the program and documentation for business and commercial pur...

Страница 5: ...t forth above are the User s sole and exclusive remedies The agents employees distributors and dealers of SKF USA Inc are not authorized to make modifications to this warranty or additional warranties on its behalf Accordingly additional statements such as advertising or sales presentations cannot expand or create warranties and should not be relied upon This warranty gives specific legal rights a...

Страница 6: ...rized service center closest to you This might save both time and money When calling the SKF electric motor test products service department or one of the service centers please have the model and serial numbers available These numbers are located on the rear of the instrument If the unit is out of warranty a purchase order will be required if the unit is returned for repair Service department num...

Страница 7: ...to a computer network scan all disks for viruses Trademarks All other trademarks service marks or registered trademarks appearing in this manual are the trademarks service marks or registered trademarks of their respective owners SKF Static Motor Analyzer Baker AWA IV User Manual v Notices ...

Страница 8: ...ed to Member States relating to the electromagnetic compatibility as amended by Council Directive 93 68 EEC Note due to the phenomena being observed and the material properties being measured this equipment does radiate radio frequency energy while in the active test mode Referenced Safety Standards EN 61010 1 Referenced EMC Standards EN 61326 2001 EN 55011 Class A EN 61000 3 2 EN 61000 3 3 EN 610...

Страница 9: ...itions 10 3 Baker AWA IV instrument overview 11 Baker AWAIV 2kV 4kV model front panel 11 AWAIV 6kV 12kV model front panel 13 4 Baker AWA IV software overview 15 Starting the software 15 Creating a new database 16 Opening an existing database 17 The first time version 4 software is used 18 Main window 19 Main menu 20 Toolbar 24 Tabs 25 Viewing test data 29 Using the Data tab 30 Data tab Surge view ...

Страница 10: ...se management 61 Starting the software 61 Creating a new database 62 Opening an existing database 63 Using multiple databases 64 Data Transfer feature 65 Archiving a database 69 Restoring a database 70 Converting an older database 72 6 Setting up the Baker AWA IV tester 75 Printer configuration 75 Provided memory key 75 Use of footswitch 75 7 Test procedures 79 Recommended testing sequence 79 Reco...

Страница 11: ...lt messages 150 Resistance failure types 150 DC tests failure types 151 Surge test failure types 151 11 Using power packs with 6 12 kV models 153 Power pack set up 154 Operating position 154 Power pack resistance testing 155 Testing with the Baker 30 three phase test lead power pack 155 Testing with the Baker 24 single phase test lead power pack 158 Addressing Surge test nuisance failures 160 Comb...

Страница 12: ...alibration information 187 Warranty return 187 Appendix B Software basics and installation 189 Navigating the software interface 189 Buttons 189 Text fields 189 Scroll bars and Windows icons 190 Baker admin or user shell 190 Software installation 190 Desktop install 190 Appendix C Technical specifications and applicable standards 191 Baker AWA IV 2 kV and 4 kV tester specifications 191 Baker AWA I...

Страница 13: ...efSrgWaveForm 217 Database Information table DatabaseInfo 218 Work list table Route 218 Motor voltage class table MotorVoltageClasses 219 Appendix E Baker AWA IV specific winding faults 221 Software fault messages 221 Resistance failure types 221 DC tests failure types 222 Surge test failure types 222 Appendix F Glossary of terms 223 Index 227 SKF Static Motor Analyzer Baker AWA IV User Manual xi ...

Страница 14: ...xii SKF Static Motor Analyzer Baker AWA IV User Manual Table of Contents ...

Страница 15: ...ntion is set in the following format and structure NOTE Indicates additional information about the related topic that deserves closer attention or provides a tip for using the product NOTICE Indicates information about product usage that can result in difficulty using product a loss of data or minor equipment damage if not heeded CAUTION Indicates a hazardous situation with potential for minor to ...

Страница 16: ...2 SKF Static Motor Analyzer Baker AWA IV User Manual About this manual ...

Страница 17: ...terminal Located on rear panel of instrument by ground terminal Warning about hazardous voltage and risk of injury or death from severe electrical shock Located beside each red test lead on front panel of instrument and on back of unit Labels on equipment The following Danger notice label appears on all four sides of the power pack units used with the Baker AWA IV and on the top of the Baker AWA I...

Страница 18: ...oth operators are aware of all conditions at all times Always know what test is being performed and when For example do not adjust test leads when operating a footswitch Leads will have live voltage and severe electrical shock may result For capacitor started motors or systems with surge arrestors power factor capacitors be sure to disconnect all capacitors from the test circuit before testing Upo...

Страница 19: ...rts warning You must replace defective damaged or broken test leads with factory authorized parts to ensure safe operation and maintain performance specifications Ground the product The devices covered in this manual are grounded through the power cord s grounding conductor To avoid electrical shock plug the power cord into a properly wired grounded receptacle before connecting the product test le...

Страница 20: ...it to quickly discontinue a test and to shut off power to the power pack s high voltage circuitry The button will remain locked in position until manually retracted by rotating the Emergency Stop button clockwise Figure 3 Power pack showing Emergency Stop button 6 SKF Static Motor Analyzer Baker AWA IV User Manual Safety and general operating information ...

Страница 21: ...aker ZTX unit and it is in the line with the status lights on the remote E Stop accessory Figure 4 Baker ZTX unit and Remote E Stop Emergency Stop buttons After being pressed the button will remain locked in position until manually retracted by rotating the Emergency Stop button clockwise A warning message will appear on the Baker AWA IV screen SKF Static Motor Analyzer Baker AWA IV User Manual 7 ...

Страница 22: ...ly non conductive pollution occurs However temporary conductivity caused by condensation is expected Power requirements Using the provided AC power cord connect the unit to a grounded AC power source The unit s power requirements are 100 240 V AC 50 60 Hz 2 amps AC maximum current draw An auto reset circuit breaker protects the unit 220 240 VAC units 220 240 VAC input units are indicated by inform...

Страница 23: ...d shipping Lifting the instrument CAUTION Lift the unit using two 3 6 m 12 ft lifting straps placed under the unit as shown in the photos below Do not use the handle of the instrument to lift the unit Figure 5 Properly lifting the unit using straps CAUTION The power pack is shipped as indicated by the shipping labels Inspect the units after shipping and notify carrier immediately if damaged is fou...

Страница 24: ...han vertically with all four wheels down on a level service If the product must be shipped for any reason the package containing the power pack must be properly labeled with this side up labels to ensure the instrument is shipped in the upright position 10 SKF Static Motor Analyzer Baker AWA IV User Manual Safety and general operating information ...

Страница 25: ...s voltage capacity is identified by the markings found just below the touch screen Figure 6 Front panel controls for Baker AWA IV 2 kV and 4 KV models VGA port The VGA port is used to connect the tester to a larger monitor not included for easier viewing of test results USB ports Industry standard USB ports are accessible from the front panel for connections to a printing device and data storage a...

Страница 26: ...leads The Baker AWA uses high voltage test leads for surge Baker ZTX and DC testing You must keep the leads clean and dry for best measurement performance Voltage output control knob 6 kV and 12 kV models only Turn the knob clockwise to increase the applied voltage or counterclockwise to decrease the voltage The rate of voltage increase or decrease is set via the touch screen interface Do not forc...

Страница 27: ...terface features a logical layout of large touch icons that improve ease of use even with electrical gloves Each tester s voltage capacity is identified by the markings found just below the touch screen Figure 7 Front panel controls for Baker AWA IV 6 kV and 12 KV models SKF Static Motor Analyzer Baker AWA IV User Manual 13 Baker AWA IV Instrument Overview ...

Страница 28: ...14 SKF Static Motor Analyzer Baker AWA IV User Manual Baker AWA IV Instrument Overview ...

Страница 29: ...The Test ID consists of all test parameters to be used when performing tests on a motor Details such as test voltages pass or fail criteria and test times are contained in a Test ID You name and define Test IDs The software includes predefined Test IDs for several different machines Usually the most important parts of a Test ID are the test voltages Therefore a Test ID is named after the operating...

Страница 30: ...reate a new database by clicking on New from the File menu or the new database icon on the toolbar The same Create New Database window will appear Figure 9 Creating a new database 3 The Save as type folder is the default folder Navigate to another folder if you prefer and enter the name of the new database in the box next to the file name 4 Click on the Save button A database will be created and o...

Страница 31: ...on under the File menu or click on the open database icon on the toolbar 2 A Select Baker AWAIV Database window appears to help you locate and select the desired database It will default to the folder that has been selected in View Options File Locations menu item 3 Select a database mdb then click the Open button or double clicking on the desired database Figure 10 Selecting an existing database ...

Страница 32: ...cord The tester information is usually entered at the manufacturer before the Baker AWAIV is shipped however it may be changed though calibration which can be invoked by checking the Enable Calibration box in the Tests tab Figure 11 Enter Test Equipment Information window NOTE Test results from a converted database databases from a pre 4 0 version will not have this information Converted records w...

Страница 33: ...motors in the Baker AWAIV s database The Baker AWAIV software Main window is split into two panes The left pane contains three different tabs Explore Motor ID and Route that facilitate browsing through the motors in the database The right pane contains three more tabs Data Tests and Trending that help you view test data performance of set tests and trending mechanisms SKF Static Motor Analyzer Bak...

Страница 34: ... functions organized by the categories implied by the menu labels Each menu is described in the following sections File menu Clicking on the File menu drops down a list of items that help you choose the database s that you want to use during your session Databases that are open are listed just above the Exit item Clicking on Exit closes the application The Print menu item provides access to printi...

Страница 35: ...ame the labels for location field one default is Location and location field two default is Building Clicking on the Enable Voltage Class item toggles the setting that requires the use of voltage classes When this feature is enabled a check appears next to the item Clicking on the Allow Duplicate Motor ID s item allows the system to create motor IDs that are identical An example of using this func...

Страница 36: ...ws you the current location of the database file you are current using Clicking on Load Text File opens a window to help you select a text file to view within the system Figure 16 Database menu Window menu The Windows menu provides you with functions for selecting which database to use if several are open along with options for displaying windows within your screen Figure 17 Window menu 22 SKF Sta...

Страница 37: ...file viewer MS WordPad can be used to view files output in Word format and the MS Paint program is handy for annotating screen captures Figure 18 Tools menu Help menu The Help menu provides information about the Baker AWAIV software version and tester It also provides access to the current user manual which is available online Figure 19 Help menu SKF Static Motor Analyzer Baker AWA IV User Manual ...

Страница 38: ...nt Transfer Motors and About Hovering the mouse cursor over an icon provides you with flyout tool tips that identify the icon The Toolbar also identifies the current motor displayed in the user interface along with the number of test records currently stored in the database for the selected device motor Figure 20 Toolbar 24 SKF Static Motor Analyzer Baker AWA IV User Manual Baker AWA IV software o...

Страница 39: ...ucture to help you locate and select a particular Motor ID The two upper levels of the tree correspond to the location and building in which the physical motor is housed Figure 21 Explore tab Location and Building are the default tree labels but these labels can be changed to better suit your situation and best practices The lowest level is the Motor ID In the example above the selected Motor ID i...

Страница 40: ...e as you enter more characters For example if the letters Cmp are typed the Cmprse32 45A Motor ID would be highlighted When you find the Motor ID you are looking for double click on that Motor ID You can also ensure that the Motor ID you want is highlighted and appears in the field just above the list Then you can click the Display button Using either method the Motor ID would become the currently...

Страница 41: ...ute IDs edit box will be blank so you can enter a new Route ID After entering the new ID start adding Motor IDs from the Available Motors list box on the right to the Route Motors list box on the left 2 To add a motor select the Motor ID on the right and click on the Add button The Motor ID will be moved from the Available Motors list to the Route Motors list Continue adding motors as needed 3 Whe...

Страница 42: ... Motors list that you want to add then click on the Add button Select one motor at a time or use the control shift keys to select a group of Motor IDs 5 To remove unwanted Motor IDs from the route select the Motor IDs from the Route Motors list then click on the Remove button The Motor IDs will be removed from the Route Motor list and be added back to the Available Motors list 6 To change the orde...

Страница 43: ... these tabs help you view results data for a variety of tests check the status configure or execute tests and display trending graphs that chart acquired data over time Figure 24 Right pane of Main window features Data Tests and Tending tabs SKF Static Motor Analyzer Baker AWA IV User Manual 29 Baker AWA IV software overview ...

Страница 44: ...the specific test By clicking on a date time you can view test result data for that specific date within the Application Surge PI or Step Ramp Voltage tabs in the lower section The view in the lower section changes depending on which bottom tab is selected Figure 25 Data tab sections 30 SKF Static Motor Analyzer Baker AWA IV User Manual Baker AWA IV software overview ...

Страница 45: ...r ID for process 1 could be intake pump P1 while the Motor ID for process 2 could be intake pump P2 Motor location fields The Motor ID is the primary identifier and locator of a motor Two other fields are also used to help locate a motor within the database These fields have the default field names Location and Building If these labels do not make sense for the situation you should change them To ...

Страница 46: ...angeable Labels The location fields are used in the Explore tab to help locate motors All other fields in the Nameplate view are optional Figure 27 Data tab nameplate view NOTE Many industrial customers have found that filling in all nameplate fields greatly helps with preventive maintenance programs by providing one place where their plant s motor data is kept Likewise motor shop customers often ...

Страница 47: ... finished entering your values click on the Save button 5 Enter the Test ID to be used when testing the new motor NOTE Clicking the Reset button will re display the previously motor and nothing will be added Updating an existing motor s nameplate information 1 Select the desired Motor ID then move the cursor to the field s you need to update and make your changes The Save button will be enabled as...

Страница 48: ...f the motor before it was tested and so on Figure 29 Data tab applications view NOTE The tester type tester serial number and calibration date are stamped on this record to indicate what tester performed the test You can use this view to add new application records which add an empty test record update existing information and delete test results To change what test result is being displayed click...

Страница 49: ...re tests fail the date time will display in a red cell If no tests were performed the cell will be gray Use the scroll bars to the right and bottom to scroll through the results for each test category The side by side nature of this view allows comparisons to easily be made by allowing all test results for a motor to be seen in one view To print a copy of this view click the right mouse button cli...

Страница 50: ...at the 1 3 2 3 and full voltage are superimposed Additionally if the test failed the previous to fail and the failed waveform will be displayed with the failed waveform being drawn in red Figure 31 Data tab Surge view showing test results The Surge view not only displays the surge waveforms for all leads it also renders a view of the pulse to pulse Error Area Ratio EAR 36 SKF Static Motor Analyzer...

Страница 51: ...lse EAR graph The graph displays the EAR percentage between successive pulses per test lead and the tolerance used during the test Figure 32 Pulse to pulse EAR example SKF Static Motor Analyzer Baker AWA IV User Manual 37 Baker AWA IV software overview ...

Страница 52: ...he Meg Ohm reading vs time Under the PI graph are selected data points used in the graph On the right side of the graph you will see data for PASS FAIL Test Voltage DA PI ratios and four check boxes You can use the check boxes to select the graph plot Meg Ohm and or Current data in one second or one minute increments 38 SKF Static Motor Analyzer Baker AWA IV User Manual Baker AWA IV software overv...

Страница 53: ...s determines what will be plotted on the graph and in the table Voltage is displayed in blue and real time current in red The green line with triangle markers indicate the current at the end of each step Figure 34 Step ramp Voltage view showing current vs voltage NOTE The large excursion of the red real time current line shows the motor s charging current while ramping up voltage The large swings ...

Страница 54: ...ulation problem is often indicated The data in the table below the graph shows the test time per step the voltage of each step the measured end point current and the Meg Ohm value at each end point Figure 35 Step Ramp Voltage view showing current vs time 40 SKF Static Motor Analyzer Baker AWA IV User Manual Baker AWA IV software overview ...

Страница 55: ...isplays the reason the test failed To run an automatic test click the Run Auto Test button Each test that is turned on will be performed in the sequence as it appears in the Tests tab view To edit Test IDs click on the Edit Test ID check box You will be prompted for a password If this is the first time you are editing a Test ID since the Baker AWAIV software s installation click on the Change Pass...

Страница 56: ... resistance and temperature test windows are combined into one and are shown below This window is also used during testing The resistance test and the temperature test can also be turned on or off using the check boxes on the left side of the window Figure 37 Temperature Resistance test window The temperature test is used to acquire the temperature of the motor The temperature is entered manually ...

Страница 57: ...calculated at the end of the test If the percent spread is outside the number entered in the edit box the Baker AWAIV will fail the resistance test Resistance measurements can be influenced by humidity To enable setting the relative humidity check the Relative Humidity box then enter the humidity present Click on Accept to commit the settings The acquired resistance values may be temperature corre...

Страница 58: ...ndow contains the test radio buttons measured resistance values and the temperature corrected resistance values The fourth column displays the calculated coil resistance As mentioned previously there are two ways to obtain resistance data In automatic mode the Baker AWA IV will measure the resistance when you click on the Automatic radio button The second way to determine resistance data is to ent...

Страница 59: ...ne to line type measurements To enable manual data entry click the Manual Entry radio button then the results section of the Resistance test window shows measured L L above the Lead Resistance column In this column of three edit boxes the lead resistances for the manual measurement should be entered as described below for the either the wye wound motor or the delta wound motor When you have finish...

Страница 60: ...en the Meg Ohm PI DA or HiPot voltage buttons are clicked on in the Tests view Figure 44 DC tests Think of all these tests as a single type of test The Meg Ohm test is the first test to be run followed immediately by a PI test and then a HiPot test There are two dropdown lists for PI and HiPot This is where the DA only Revert DA Ramp Voltage and Step Voltage tests are located Therefore a single se...

Страница 61: ...amination level with the winding The ramp voltage test is performed for a predetermined length of time at a specific voltage level The voltage increases linearly on a specific time scale As the test is operating the key is to watch the current If it remains linear with the voltage the winding is in good condition however if the current waves up and down the winding may be contaminated The figure b...

Страница 62: ...teps needed Make sure the steps are appropriate for the application being tested The Seconds window is used to enter up to 30 voltage steps or test intervals for each step This window will also appear when the step voltage test runs and will display a real time graph of the voltage and current collected during the test After this test has been set up it can be edited prior to running the test Clic...

Страница 63: ...s Div field is typically set automatically by the Baker AWAIV but it may be overridden by the user This field determines the y axis scale on the surge waveform graph The µS Div x axis field can also be set to automatically capture the waveform in time It can also be manually overridden in a specific setting The top center of the window shows a series of check boxes that determine Pass Fail criteri...

Страница 64: ...w real time numbers for the specific lead while the test is running These numbers will become visible during the test Check the Test Ref EAR box to enable setting pass fail criteria when comparing the surge waveforms from the test to a previously stored reference test The four buttons on the right side of the window will run a surge test when clicked Clicking on the Lead 1 button starts a manual s...

Страница 65: ...tage across a coil versus time On the right side of the graph is a slider bar with an E label at the top This slider bar will rise as the energy is increased by the tester to create the displayed waveform Figure 52 Surge waveform window Effectively this slider bar shows how far down the pedal must be clicked to obtain the surge waveform Low impedance coils those with few turns require more energy ...

Страница 66: ...esting a reference motor While in edit mode the Edit Test ID check box is checked Directly after setting up the test parameters hook the Baker AWAIV to the reference motor and confirm that the Motor ID displayed on the toolbar is the reference Motor ID Click the Run Auto Test button Upon completion of the test the tester will prompt to save the results as a reference Figure 54 Confirmation dialog ...

Страница 67: ...re 55 Display reference button Click Done to return to the Tests window Click the Run Auto Test button to begin the test If the motors have passed all other tests and there is a reference waveform the Baker AWAIV software will calculate the Error Area Ratio EAR at the end of the surge test The EAR is calculated between leads of the motor under test and the reference motor Reference motor s lead 1 ...

Страница 68: ...lid lines and the overlaid reference motor s surge waveforms dashed lines Figure 56 Surge results display NOTE If the reference waveform is very close to the selected motor s waveform it will hide the dashed waveform so only the solid lines are viewed To see one lead at a time check or uncheck the desired lead s check box 54 SKF Static Motor Analyzer Baker AWA IV User Manual Baker AWA IV software ...

Страница 69: ...ce Coil Resistance Meg Ohm correct or not corrected PI and HiPot leakage currents can be graphed over time so you can get an idea of the long term status of a motor s insulation These graphs can be reset are selectable by date and have several printing options Figure 57 Trending graph SKF Static Motor Analyzer Baker AWA IV User Manual 55 Baker AWA IV software overview ...

Страница 70: ...terval Each of the three leads is shown in its own color Each data point is indicated by a square diamond or triangle marker Hovering over a data point will show a date time stamp and give the value of the test This feature allows for easy identification of the test record for that point Clicking the Reset box returns the markers to the first trending window Figure 58 Resistance trending graph 56 ...

Страница 71: ...s the value of the test NOTE When trending Meg Ohm values the temperature corrected values should be used and not the uncorrected values Both values are available in the software Sometimes it is not possible to acquire the temperature of a motor when testing due to inaccessibility of the motor SKF Static Motor Analyzer Baker AWA IV User Manual 57 Baker AWA IV software overview ...

Страница 72: ...er trending graphs Figure 60 PI trending graph HiPot Clicking on HiPot in the dropdown box brings up a graph of the HiPot leakage current data This has the same features as the Meg Ohm trending graph Figure 61 HiPot trending graph 58 SKF Static Motor Analyzer Baker AWA IV User Manual Baker AWA IV software overview ...

Страница 73: ...r some invalid points need to be excluded You can select specific data points using one of two methods The first is when the trending graph is displayed Hold the left mouse button then drag and draw a box around the points you want to display When you release the left mouse button the graph will automatically re scale and display the points inside the box you drew To reset the graph click on the R...

Страница 74: ...your keyboard and click on the last record to select a range 4 Within a selected range click the Ctrl key on your keyboard and click to remove an unwanted record from the selection Figure 64 Dates to trend spreadsheet Additionally all of the records on this window can be exported to a comma delimited file for later importing into a spreadsheet In this manner data can be analyzed using your preferr...

Страница 75: ...ths until a motor that was previously tested fails The maintenance manager wants to see all the test data When the project supervisor looks at the data he finds nearly 7000 tests all in one large database and in a random order The manager spends about an hour looking for the last test performed and gives up Upon investigation the manager finds that each of the technicians using the equipment has b...

Страница 76: ...te a new database by clicking on New from the File menu or the new database icon on the toolbar The same Create New Database window will appear Figure 65 Creating a new database 3 The Save as type folder is the default folder Navigate to another folder if you prefer and enter the name of the new database in the box next to the file name 4 Click on the Save button A database will be created and ope...

Страница 77: ...under the File menu or click on the open database icon on the toolbar 2 A Select Baker AWA IV Database window appears to help you locate and select the desired database It will default to the folder that has been selected in View Options File Locations menu item 3 Select a database mdb then click the Open button or double clicking on the desired database Figure 66 Selecting an existing database SK...

Страница 78: ... a network and have databases locally on each Baker AWA IV which then update the main database Figure 67 Opening an existing database NOTICE It is important to establish best practices for database organization early and maintain adherence to your practices to avoid loss of data or data duplication Manipulation of the database may be useful for management and auditing purposes Do not delete record...

Страница 79: ...lity Transferring motor and test result data Two databases need to be open to transfer motor information test result data and Test IDs a source database and a destination database Both databases must exist before beginning the transfer For example if the transfer is to a new destination database it will need to be created prior to beginning the data transfer To create a new database select the Fil...

Страница 80: ...lder with the Example mdb for the file name Pick the default database or choose another database to transfer data from as need Figure 69 Select source Baker AWAIV database When the source database has been chosen click the Open button The Data Transfer window appears with the source database opened on the left side This is the same Motor ID tree structure as used elsewhere in the software Figure 7...

Страница 81: ...you want to add all data click on the Add All button The Transfer List displays all motors that will be transferred when you click the Transfer button If there are motors in the Transfer List that do not need to be transferred remove them by selecting the motor s and clicking the Remove button When the Transfer List is finalized press the Transfer button When you click on the Transfer button the s...

Страница 82: ... all Test IDs in the source database along with the Test IDs currently found in the destination database Choose the source Test IDs to transfer by highlighting them To select multiple IDS use the shift and control keys on your keyboard while clicking on the Test IDs With the desired Test IDs highlighted click on the Transfer button to start the transfer The software will transfer copy the requeste...

Страница 83: ... database on a flash drive or CD to move it from one computer to another If the archive option is used to copy and compress a database use the Restore option discussed next in this chapter to extract the database from the storage device back to a hard drive To archive a database it must be opened in the Baker AWA IV application 1 Click on Database in the main menu then Archive 2 The New Archive wi...

Страница 84: ...hour minute second when the file was archived When the archive is finished the following message will be displayed Figure 75 Archive complete It is important to note the location of the archived file zip or cab Click on the OK button to return to the Baker AWA IV application Restoring a database To view archived data with the Baker AWA IV software the database must be restored first To restore an ...

Страница 85: ...osing the archived database to restore choose the folder to extract the archived database into If the database is to be restored to a different folder browse to that folder When the appropriate folder is located click the OK button Figure 78 Browse for folder SKF Static Motor Analyzer Baker AWA IV User Manual 71 Database management and maintenance ...

Страница 86: ...ll still be on the Baker AWA IV Here are a few suggestions for making the change to the Version 4 database 1 Make a backup copy of all old databases Use WinZip an older standalone version of the Data Transfer archive feature or simply use Windows Explorer to make a copy 2 Install the new Baker AWA IV Version 4 software 3 Convert all old databases to the new version by opening each of the old datab...

Страница 87: ... File then Open and the window will open so you can select the old database from the C AWAData folder where it is stored The software will automatically identify the database as an old database and presents you with the above message indicating the database will be converted The Version 4 software then opens a Convert Database Into window with a new database name filled in the new name is the old ...

Страница 88: ...74 SKF Static Motor Analyzer Baker AWA IV User Manual Database management and maintenance ...

Страница 89: ...the screen 7 The Baker AWA IV will automatically log in to the Baker AWA IV software with the associated serial number information NOTE An administrator can change this to log into the Windows Desktop however SKF recommends not to change it If passwords are changed and the instrument is returned for service without the passwords the instruments hard drive will be reformatted and all user saved dat...

Страница 90: ...76 SKF Static Motor Analyzer Baker AWA IV User Manual Set up of the Baker AWA IV analyzer ...

Страница 91: ...SKF Static Motor Analyzer Baker AWA IV User Manual 77 Set up of the Baker AWA IV analyzer ...

Страница 92: ...78 SKF Static Motor Analyzer Baker AWA IV User Manual Set up of the Baker AWA IV analyzer ...

Страница 93: ... to the motor s core Hard shorts between coils either within the same phase or between phases Coils rewound with the improper gauge wire Loose or corroded connections Further hipot or surge tests are not necessary until the resistance measurement is acceptable Meg Ohm test A meg Ohm test is performed using a test voltage based on the operating voltage of the motor and the appropriate standards com...

Страница 94: ...plied to all three phases of the winding raised slowly to a preprogrammed voltage step level and held for a predetermined time period This is continued until the target test voltage is reached Because the test is the most stable at the end of each step data is logged at this point If at this point the leakage current IµA doubles insulation weakness is indicated and the test should be stopped If th...

Страница 95: ...2000 test voltages less than 5000V Examples for 460 V AC and 4160 V AC motors are as follows 2 x 460 V 1000 V 920 1000 1920 V 2 x 4160 V 1000 V 8320 1000 9320 V For new windings or rewound motors the test voltage is sometimes increased by a factor of 1 2 or even 1 7 This provides for a higher level of quality control on the work performed For motors above 460 V the test voltage would be 1920V 1 2 ...

Страница 96: ... and assigned to the Motor ID Then tests will be run and the results reviewed Finally reports will be printed The motor for this example is a Delco 460V three phase wye wound induction motor and has the following data on the nameplate Model 2G2104 Frame 213 SN B 95 Insulation B Amb oC 65degC V 460V A 4 2A HP 3 RPM 1765 Hz 60 LR Code J SF 1 0 Des B NEMA nom eff 84 Duty Cycle Cont Using this informa...

Страница 97: ...e information for the motor If needed click on the Clear button to clear the rest of the nameplate form 4 The Reset button restores the previous motor s information to the form Figure 82 Motor IDs NOTE There are more data fields available than are contained on the nameplate Only those items that are on the nameplate are filled in 5 Enter a unique identifier for the Motor ID For this example use De...

Страница 98: ...ssign a Test ID to the newly created motor In this example select the 480Vw o PI Test ID 9 Create a new Test ID and assign the new Test ID to this Motor ID For this example we use Delco_B 95 22L 10 After the Test ID is selected click on the OK button The new Motor ID Delco_B 95 22L is now added to the Motor Tree along with all the other motors Now that the Motor ID has been created the next step i...

Страница 99: ...it Test ID box 3 Enter the password NOTE If this is the first time you edit a Test ID on the tester you will need to set up the password To do this click on the Change Password button and enter a password Then click on Set Password Click OK When the application has accepted the password the Update Add and Delete buttons will appear and the voltage class dropdown list will be enabled The Edit Test ...

Страница 100: ...f the dropdown list 8 If a new voltage class type has been entered enter a description and click on the Add Voltage Class button A dialog box will appear asking if this action is correct If it is click OK This will close the Create New Test ID dialog box 9 The new Test ID will be displayed and all tests are turned off The Tests tab will resemble the example shown below 10 Turn on all required test...

Страница 101: ...n the Resistance Enable radio button will also be green The Delco motor in this example is Wye wound which is indicated on the window and can be changed on the motor s Nameplate tab Figure 87 Temperature Resistance test parameters 5 The 3 Leads and Automatic radio buttons will be selected by the software for the 3 phase motor The Baker AWA IV will automatically acquire the resistance readings 6 Le...

Страница 102: ...e the Meg Ohm PI HiPot tests click on one of the three buttons to the right of the Meg Ohm PI HIPOT buttons to bring up the DCTests window For this motor the Meg Ohm and PI tests will be run at 500V while the HiPot test will be run at 2000V Consult IEEE 43 95 or another appropriate standard to determine test voltages 2 Because this is a small motor the PI test will run as a DA test only by checkin...

Страница 103: ... a high number such as 50 7 The P P EAR Pulse to Pulse EAR is set to 10 This means that a pulse to pulse EAR value greater than 10 will cause the Baker AWA IV to stop testing and fail the test This number can be reduced provided the step voltage is also reduced 8 The Test Ref EAR is set to 10 which means that if a test is run and a reference test exists the acquired waveforms will be compared to t...

Страница 104: ...sistance 3 Meg Ohm 4 PI DA 5 Hipot step voltage 6 Surge At the end of the sequence the test data will automatically be saved to the database For completeness it must be mentioned that tests can also be run from the test windows themselves a process called semiautomatic testing Additionally tests can be run manually using the controls on the front panel of the tester A semi automatic test can be ru...

Страница 105: ...t ID the Temperature Resistance dialog box will close If low voltage leads were used a dialog box appears to instruct you to switch to the high voltage leads Figure 90 Test verification Meg Ohm Starts by ramping up all test leads to 500V This voltage will be held for 60 seconds during which the Baker AWAIV watches for HiPot trips or insulation resistance values below the minimum Meg Ohm setting Sh...

Страница 106: ...be discharged and grounded You will be given the choice to repeat the test stop all testing or continue to the next test If no failures have been found during the HiPot test the Baker AWA IV will continue to the next test Surge The test will begin automatically The Surge Test window appears and the test voltage slowly ramps up on lead 1 to 2000 V as specified by the Test ID If no pulse to pulse EA...

Страница 107: ... area on the top part of the window and a spreadsheet style view of the data on the bottom Figure 93 Main test window with passed results Figure 94 Date time results summary The Date Time area shows a quick summary of the time and date of tests and whether the tests passed or failed Double click on a test date and time to move to a new record SKF Static Motor Analyzer Baker AWA IV User Manual 93 T...

Страница 108: ...ed in a spreadsheet style The test date and time are shown across the top of the window with specific measurement results shown in each column Figure 95 Test results spreadsheet 94 SKF Static Motor Analyzer Baker AWA IV User Manual Test procedures ...

Страница 109: ...s The PI voltage DA ratio and PI ratio are displayed on the right side Because this test was a DA only the PI ratio has I 0 No PI indicating there is no PI value because the current was zero Figure 96 Reviewing PI test data Click on the Surge tab to view surge test data Figure 97 Surge waveform view SKF Static Motor Analyzer Baker AWA IV User Manual 95 Test procedures ...

Страница 110: ...ey can be printed to a Microsoft Word file or other file formats as needed or preferred For convenience reports can be printed from a desktop computer rather than directly from the tester itself Figure 98 Report generator Start the Report Generator by Clicking on File then Print Holding down the Ctrl key on your keyboard and pressing the P key Clicking on the printer icon in the upper left section...

Страница 111: ...ow called Select Reports to select the report type that you want to print You have several choices including Nameplate Application Summary Surge PI and Step Ramp Voltage to name a few You can also add a report title which will appear in the final report After selecting the report type you need click on the Output Report To dropdown list to select the report format needed Your options include MHTML...

Страница 112: ...io button is not selected 3 In the Select Reports section the Results Summary with Surge Summary is selected The Printer is selected as the output 4 When the Create Report button is clicked the Report Generator will go through the entire database looking for failed tests that occurred on 11 6 2013 5 When the software completes its search a dialog box appears showing how many records were selected ...

Страница 113: ... used with discretion because printing reports to MS Word takes some time selecting a lot of records to print means the system would be tied up until all records can be transferred to the Word document A example Word report is shown below Each section is a Word table except the surge waveform which is a bitmap The reports can be modified by adding text between the tables or the data tables can be ...

Страница 114: ...Summary Figure 103 Example MS Word Report with nested surge results and graphics Files can be saved in other formats including MHTML MIME HMTL web archive a comma delimited text file and Ref to Bar EAR CSV File 100 SKF Static Motor Analyzer Baker AWA IV User Manual Test procedures ...

Страница 115: ...roperly and tests are conducted precisely trending can help monitor the rate of insulation decay Observing data over time can also help establish a schedule for motor testing During maintenance testing failure of a test indicates possible motor problems Additional testing for example visual inspection might be warranted The combination of tests should be determined by experienced operators If the ...

Страница 116: ...refurbishment vs replacement Isolation of a phase to phase short for example can be done with a surge test performed on the windings A shorted winding will yield a waveform substantially different from two good windings Motor shops can use the Baker AWA IV to indicate where a problem has occurred pinpointing what needs to be repaired Baker AWA IV test results provide a tool for recommendations to ...

Страница 117: ...yzer has a capacitor with a value of 0 1 micro farad The frequency f generated and therefore the sample width needed when a 100 micro henry coil is tested with the standard surge test is calculated using the following formula L C f π 2 1 becomes 6 6 1 100 2 1 π f when solved reveals a ringing or resonance frequency of approximately 50 kHz The period of said 50 kHz sinusoid is equivalent to f 1 or ...

Страница 118: ...t ID should include 1 Temperature correction 2 Kelvin resistance with two leads selected 3 Meg Ohm with a suitable value of pass fail for meg ohm value defined 4 DA PI test with a suitable value of pass fail defined 5 DCTest such as the DC hipot 6 Standard Surge test with two leads selected by virtue of two leads resistance 2 Test ID field Shunt fields are generally high inductance quite higher in...

Страница 119: ...in the two previously discussed sets of test IDs we could arrive at the following Figure 105 Test ID for F1 F2 300V field SKF Static Motor Analyzer Baker AWA IV User Manual 105 Special features of the Baker AWA IV ...

Страница 120: ...Expect DC resistance of the fields F1 F2 to be much greater than the armature Expect the ability to employ the Hi L technique on the shunt fields Employ target corrected resistance detection for trending Consider employment of Test Ref for A1 A2 and F1 F2 for trending Consider steps to code or lock the acquisition time base for the specific motor 106 SKF Static Motor Analyzer Baker AWA IV User Man...

Страница 121: ... enabling Target Corrected Resistance in anticipation for using trending later 3 Given that you are now aware of the low resistance of the armature take steps to code the surge test sequence specifically for the low resistance This equates to a lower value of time base not necessarily 10 it could be 50 4 Be sure to turn off the Hi L Figure 107 Hi L temperature resistance SKF Static Motor Analyzer ...

Страница 122: ...ons show the steps to program the time base specifically for the shunt fields Figure 108 Hi L surge test 6 Set micro seconds to 200 and be sure to select Hi L save the test ID when done Figure 109 Hi L surge test 108 SKF Static Motor Analyzer Baker AWA IV User Manual Special features of the Baker AWA IV ...

Страница 123: ...have these steps in place the successive test data should look similar to the following example Figure 110 Hi L results SKF Static Motor Analyzer Baker AWA IV User Manual 109 Special features of the Baker AWA IV ...

Страница 124: ...110 SKF Static Motor Analyzer Baker AWA IV User Manual Special features of the Baker AWA IV ...

Страница 125: ...identify a bad coil Variations of wire conductivity associated with the winding s temperature can affect measured resistance Measured resistance values should be corrected to reflect conductivity at a common temperature usually 25 C 77 F before comparisons are made between two measurements Windings can be made with both copper and aluminium The variation of resistivity to temperature is different ...

Страница 126: ...nductance as well as resistance Reason would suggest that a problem in a winding should show up as a change in inductance and resistance Therefore measurements of inductance and resistance are made to evaluate the winding s overall health more specifically to evaluate the winding s ability to create a magnetic field A short review of inductance and impedance in general is appropriate In general if...

Страница 127: ...ductance L changes in the coil s ability to make a magnetic field are determined From a physical standpoint the number of turns in a coil the material properties surrounding the coil that is the motor core and the shape of the coil all combine to determine the coil s inductance The following equation shows how these parameters combine to determine a coil s inductance where the constant A describes...

Страница 128: ...ixed phase reference are measured Describing the voltage cosine of a certain amplitude and phase is shown in the following formula where V0 is the nominal voltage w is the angular frequency t is time and a is the phase angle of the voltage with respect to a reference For notational convenience the voltage is often written in a vector notation as The current through the coil is described as where I...

Страница 129: ... 160 turns in a phase leg With just one turn shorted the phase leg would have 159 turns The percentage change in inductance would be To identify a hard short compare inductance readings that should be the same For example measure the phase to phase inductances of the three phases of an AC induction machine s stator without the rotor installed If the stator is form wound all three inductance readin...

Страница 130: ...3 L1 165 64 1 273847 0 0128 1040 86 89 26 The bar chart below shows the percentage change in inductance between phases of this wye connected motor Along with the inductance percentage values the line to line error area ratio EAR surge test values for the same motor are also shown Figure 113 Percentage change in inductance between wye connected motor phases Clearly there is a change in inductance t...

Страница 131: ...If a simple two wire measurement is made there will be severe errors in the data with the errors of many 100s of percent possible The indications of a shorted coil in the armature are a drop in the DC resistance between the adjacent bars and a drop in the inductance between the bars An example of just such a short is provided below Two bar charts are shown of the bar to bar resistance and inductan...

Страница 132: ...Figure 115 Example of a burned coil 118 SKF Static Motor Analyzer Baker AWA IV User Manual Motor testing theory and reference ...

Страница 133: ...sults below show resistance and inductance data from four identical interpoles Table 3 Test results from four identical interpoles Interpole DC Resistance milliohms Inductance microhenries 1 8 214 69 2 2 8 214 88 3 8 218 77 4 4 8 218 69 3 The resistance measurements show that all four coils are basically the same However the inductance values show some variability which suggests a problem with the...

Страница 134: ...current that is actually able to pass from the winding through the ground wall insulation to the motor s steel core plus any surface leakage currents that flow through moisture or contaminants on the insulation s surface To accurately determine the insulation resistance you must reduce the surface leakage to an inconsequential level The winding might need to be cleaned or heated to evaporate any m...

Страница 135: ... voltage as the megohm test It takes 10 minutes to complete We calculate the PI value by dividing the IR at 10 minutes by the resistance at one minute as shown below In general insulators that are in good condition will show a high polarization index while insulators that are damaged will not IEEE 43 recommends minimum acceptable values for the various thermal classes of motor insulation Table 4 I...

Страница 136: ...r than 5 000 megohms the PI measurement may not be meaningful In these situations the leakage current is often very low almost zero Such low leakage currents are difficult to accurately measure and as a result instrument errors become very evident However you must use judgment before declaring the PI test to be meaningless The indication of damaged insulation based on the PI test can be a very low...

Страница 137: ...ltage is not of much interest with the HiPot test What is of interest is the value of the leakage current and more specifically whether the observed leakage current is within acceptable limits The choice of test voltage depends on whether we are testing a new motor or coil for acceptance or whether we are testing an existing motor for continued service Consult your organization s policies regardin...

Страница 138: ...e intervals For motors less than 4160 the step voltages should be 500 volts An example step test sequence is provided in the following illustration Figure 117 Step voltage test example Data is logged at the end of each step to ensure that the capacitive charge and polarization current is removed and only the real leakage current remains This process ensures a true indication of the ground wall ins...

Страница 139: ...This gradient produces a momentary voltage stress between turns The coil will respond to the surge pulse with a ringing or damped sinusoidal waveform pattern Each coil has its own unique signature ringing or wave pattern which can be presented on a test display screen as shown below Figure 118 Ringing wave pattern resulting from surge testing The wave pattern observed during a surge test directly ...

Страница 140: ...insulation of coils or single windings Form coils start and run windings and multi tapped windings are a few examples Surge tests are also used to compare new windings to a standard winding to assure they conform Surge test display A complete surge test screen is provided below for reference Figure 119 Completed surge test screen NOTE The flicker in wave patterns displayed when arcing occurs betwe...

Страница 141: ...decrease in inductance When inductance decreases the frequency of the wave pattern will increase according to the formula above The figure below illustrates this This type of fault is generally one that indicates a failure of the turn to turn short Figure 120 Good coil waveform left vs bad right If any wave pattern becomes erratic and or flickers during testing intermittent shorting or arcing is p...

Страница 142: ... back voltage spike develops Large inrush currents along with the high inductance of electric motors are what give these kick back voltage spikes their high energy Lightning strikes Lightning strikes often hit power systems or grids Although a great amount of effort is made to protect grids from lightning damage high voltage transients caused by strikes can still reach motors Inverter transients V...

Страница 143: ...his chapter In this case a consistent double wave pattern displays at all voltage levels The key to maintenance testing is to detect a fault at a voltage level above the peak operating voltage but not above what the motor would withstand during start up For example a 460 V motor that shows a good trace at 500 V but shows an unstable flickering or shifting to the left pattern regardless of rotor co...

Страница 144: ...waveforms Although there is very little difference between the waveforms the real time data analysis performed by modern surge testing equipment can automatically catch such small shifts Application notes If there is indication of an open circuit check the connections between all three test leads and the device under test Check for open test leads at the clip end With heavy use check test leads we...

Страница 145: ... a test voltage for vacuum pressure impregnation coils before they are cured of 60 to 80 of the test voltage of fully cured coils Currents required to test form coils often limit the maximum surge voltage achieved Placement of the coils into the stator iron or spare laminations has the effect of increasing the coil inductance enabling the tester to produce a higher voltage drop across the coil for...

Страница 146: ...oncentric windings will always show a shift that is due to the slightly different coil sizes for each of the winding s phases Excessive separation indicates a winding failure in these types of windings In the field In assembled motors separation of the wave patterns is often the effect of rotor coupling also known as rotor loading refer to the Rotor loading coupling when testing assembled motors s...

Страница 147: ...ial of 500 V per turn when testing a two terminal device Shunt coils often have a small error in turns count Some mismatch or separation of patterns should be acceptable If the wave patterns are very close in shape and remain stable during the test the coils are generally acceptable In addition winding tolerances on single coils may allow for differences in turns count which causes a slight steady...

Страница 148: ...est leads to the rotor slip rings 5 Short together the stator leads with jumpers as done for the rotor Again the stator is shorted to limit the induced voltage on the stator windings caused by currents induced when testing the rotor 6 Perform a surge test on the rotor as if it were a stator Choose the test voltage for the rotor carefully NOTE Check the motor nameplate for rotor voltage to calculat...

Страница 149: ... in a procedure similar to that of two or more single coils Determining faults Two types of faults may exist in synchronous motors and generators pole piece faults or stator winding faults Pole piece fault Do not expect coils to compare exactly Rotating fields or pole pieces are often not wound to identical exacting standards If a fault does exist in the pole pieces of the test the wave pattern on...

Страница 150: ...bar surge test and the span surge test The use of a footswitch is highly recommended to ease the operation of each of these tests Bar to bar surge test Bar to bar armature surge tests are the most effective method to test DC armatures and detect winding insulation weaknesses and faults In many cases where the impedance of the coils in the armature is very low it may be the only method possible to ...

Страница 151: ...shift will be the greatest When the ground brush or probe is over the short there will still be a shift but not as great as when the hot brush probe is over the short Notes and tips for span tests of armatures A test fixture may be used instead of using the motor s brushes to make contact with the armature Set the span between the fixture s brushes to the desired number of commutator bars Either m...

Страница 152: ...ood ringing patterns However there are a few items to be aware of First some large AC motors have a very high inductance which means they ring with a very low frequency For manually controlled instruments be sure to zoom out to see the full ringing pattern Second some large motors will exhibit extra features at the beginning of the waveform These features can be caused by reflections of the surge ...

Страница 153: ...separation As a result it is critical to perform a winding resistance test with the SKF milli ohmmeter or a third party micro ohmmeter whenever evaluating the condition of a motor winding Perform the surge test on each of the parallel windings individually for the highest degree of fault sensitivity For the highest surge test sensitivity separate the winding into smaller groups such as individual ...

Страница 154: ...wave pattern Figure 125 Example of rotor loading on surge test Separated wave pattern comparisons for good windings Imbalance in the inductive coupling between the rotor and stator winding causes the wave patterns of two good phases to appear separated when they are compared By turning the rotor this coupling effect can be balanced out so the wave patterns superimpose Figure 126 Surge waveform sho...

Страница 155: ...rs where rotor coupling may occur 1 Surge test phase No 1 of the motor 2 Surge test phase No 2 of the motor During the test carefully turn the rotor until the wave pattern superimposes that of phase No 1 on the display 3 Repeat the steps for phase No 3 If you cannot turn the rotor carefully observe the wave pattern as the test voltage slowly rises Watch for a sudden shift to the left instability o...

Страница 156: ...refer to the previous Rotor loading coupling when testing assembled motors section You must disconnect any power factor capacitors in the circuit If power factor capacitors are present you will not observe a waveform when the voltage rises Disconnect surge arrestors The feeder cable s capacitance as well as the motor s ground wall capacitance will load the surge test circuit As a result the will n...

Страница 157: ...secondary side low side of the transformer 2 Select test lead No 1 Follow the diagram below to connect test lead No 1 to H1 and lead No 2 to H2 of the transformer Figure 129 Single phase transformer connections 3 Connect the black GRD lead and test lead No 3 to the frame 4 Perform a surge test on the winding following the procedures outlined for single phase motors and two terminal devices The dis...

Страница 158: ...connections for wye wye or delta wye transformers You should surge test the transformer windings for all the configurations shown 4 Test procedures follow identically as for single phase transformer testing refer to single phase motors and two terminal devices Table 5 Wye wye transformers Test Lead No 1 Test Lead No 2 Jumper H1 H0 X0 to X1 H2 H0 X0 to X2 H3 H0 X0 to X3 Table 6 Delta wye transforme...

Страница 159: ...y 2 Instability and separation indicating a fault or weakness in winding or phase insulation 3 Open circuit indicating an open phase or disconnected test leads 4 Grounded phase 5 Separated waveforms indicating a solid turn to turn or phase to phase short if the rotor is not in place The motor windings are considered good if all three leads wave patterns are the same and remain stable up to the spe...

Страница 160: ...urn short Figure 131 Arcing turn to turn short In this waveform the solid line represents an unstable intermittent shorting in the windings Notice its shift to the left of the dotted line 146 SKF Static Motor Analyzer Baker AWA IV User Manual Typical winding faults ...

Страница 161: ...s pattern is also seen when nothing is connected to the surge test leads Figure 132 Open circuit Hard short to ground If a hard short to ground exists the meg Ohm or hipot test will detect it It can also be detected when surge testing The wave pattern will appear as a relatively flat line The example below illustrates a grounded phase Figure 133 A hard short to ground SSKF Static Motor Analyzer Ba...

Страница 162: ...lead with the other A broken lead will stretch and a good lead will not When an open circuit is indicated check the connections between all three test leads and the winding being tested Also check for open test leads at the clip end Test leads should be checked weekly to ensure there is no breakage Baseline testing can be conducted to determine appropriate DC test pass fail tolerances Maintenance ...

Страница 163: ...st Capacitance and inductance of motor windings can load the tester output down The voltage output is reduced below maximum output which can damage the tester if the test is applied for an extended period Note The test is considered successful if the test voltage 2E 1000V is achieved Motor rated RPM is slow For each reduction of the motor s RPM i e 3600 1800 the effective horsepower of the motor t...

Страница 164: ...Y SHUTOFF Emergency Shutoff has been detected Tested Tester No message cannot determine Pass Fail because no test criteria was turned on FAIL CANCEL User cancelled test Resistance failure types Non VFD issues causes and actions with autophasing feature turned on Status Failure type Why failed message FAIL DELTA R Resistance test result Fail DELTA R Delta R percent is out of tolerance FAIL OPEN LEA...

Страница 165: ... current Test result FAIL OVER CURRENT An over current trip was detected FAIL No steps defined No steps for Step Voltage Test exist in this Test ID FAIL Low PRG HPT voltage The last step voltage is below the previous Meg Ohm PI test voltage Surge test failure types Non VFD issues causes and actions with autophasing feature turned on Status Failure type Why failed message FAIL Open leads Test Resul...

Страница 166: ...152 SKF Static Motor Analyzer Baker AWA IV User Manual Typical winding faults ...

Страница 167: ... or looped on the power pack handle The power pack surge signal can be sensed by the Baker AWA IV which will result in interference with its computer Ensure that tester and power pack leads are always separated High voltage activation when using this product Ensure that all personnel are away from the device under test and not in contact with the load or test leads Never attempt testing a load wit...

Страница 168: ...ropriate AC power source NOTE The Baker AWA IV is equipped with a ground fault monitor and indicator This circuitry should not hinder operation of GFI protected AC power circuits 9 Power up the Baker AWA IV and the power pack Follow the Baker AWA IV setup procedures in this manual 10 After a one or two minute warm up period both units will be ready for operation NOTICE If the power pack connection...

Страница 169: ...nclude three red cables and one black ground cable All have insulating jackets and are rated at 60 kV DC A black braided cable is also provided to connect the power pack to the motor frame or station ground The Test Select switch located on the lower front panel is used to switch between the different leads during the testing process energizing the proper lead at the proper time The labels on this...

Страница 170: ...he Enable Power Pack box under the HiPot test parameter column An error message will appear if a voltage below the minimum for the power pack is programmed after the Enable Power Pack box is checked NOTE An error message will appear on the Baker AWAIV screen if the power pack option is selected and a power pack is not connected 7 Turn the Output Control knob on the power pack to MIN full countercl...

Страница 171: ...duration of at least four times the duration of the DC HiPot test for high voltage windings NOTE The overcurrent trip Levels that activate the HIPOTTrip are 10 times the m Amp Division setting on the tester Release the Test button and press the HiPot and Lead 3 on the Baker AWAIV to reset the overcurrent trip and begin testing again For hipot operation of the 12kV host tester alone the host tester...

Страница 172: ...n then select a Test ID that uses a voltage requiring the power pack or create one that does 3 Click on the configuration button to the right of the name of the DC test desired The DCTests configuration window will appear 4 Adjust the voltage required so that the HiPot voltage is at least 2000 V 5 In the DCTests window check the Enable Power Pack box An error message will appear if a voltage below...

Страница 173: ... test that does 3 Click on the configuration button to the right of the Surge test The Surge configuration window will appear 4 Adjust the voltage required so that surge voltage is at least 5 000 V 5 In the Surge configuration window check the Enable Power Pack box An error message will appear on the Baker AWAIV screen if the power pack option is selected and accepted and no Power Pack connection ...

Страница 174: ...ground capacitance This is a problem sometimes encountered when using the Baker AWA IV and power pack for testing In this instance the surge wave can scale itself to the wrong sweep rate To address this issue configure a Test ID for the specific Motor ID then set up this ID to force data acquisition at a sampling rate mSeconds Div that you define 1 Connect the safety ground the black braided cable...

Страница 175: ...er AWA IV and the power pack are used together The Baker AWA IV is used to perform the winding resistance Meg Ohm and PI tests The power pack is used to perform the HiPot and Surge tests The test data collected by both instruments is then combined into a single test record in the database For this example a 4 160 volt 300 RPM motor will be tested at 4 000 volts for the meg Ohm PI test and 9300 vol...

Страница 176: ... For this example no other information on the Nameplate tab is filled in 3 Press the Tests tab to get to the testing window to create a new Test ID 4 Click on the Edit Test ID checkbox 5 Enter the password for editing Test IDs 6 Click on the Add button to open the Create New Test ID dialog box as shown below Figure 137 Creating a new Test ID 162 SKF Static Motor Analyzer Baker AWA IV User Manual U...

Страница 177: ...The HVDCTest setup window is shown in the example below Figure 138 Configuring DC tests a new Test ID Notice that all tests have been turned on the desired test voltages entered and the Enable PP30 box under the HiPot column has been checked indicating that the power pack will be used for the HiPot test The Surge Test setup window is shown below In this example the Surge Voltage has been set to 93...

Страница 178: ... finished testing will stop and the dialog box shown below will appear instructing you to disconnect the Baker AWA IV and connect the power pack to the motor Figure 140 Running test continue screen 18 The power pack test can be aborted at this time Ensure that the test area is safe and the motor leads have been properly connected before continuing 19 Click on the Abort button to discontinue the te...

Страница 179: ...e power pack s test leads and discharge the windings CAUTION Due to the polarization of the insulation in high voltage motors a dangerous situation can develop if the motor is not completely discharged To completely discharge a large motor requires the motor s leads be held at ground potential for some time IEEE 43 95 recommends a grounding interval four times the amount of time the high voltage D...

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Страница 182: ...168 SKF Static Motor Analyzer Baker AWA IV User Manual ...

Страница 183: ... have equalizer bars that connect opposing commutator bars which are also isolated from the steel armature core The armature winding consists of a few turns of high capacity conductors that span slots in the rotor and connect to the commutator bars These conductors are insulated from each other with the turn insulation Due to vibration thermal expansion chemical attack and more the turn insulation...

Страница 184: ...Armature preparation 1 Identify the bar on the armature to be used as Bar 1 2 It is also helpful to label every 5th or 10th bar 3 Insulating tape works well for labeling the bars Software settings The Baker AWA IV software must be version 4 5 0 or higher to use the Baker ZTX and perform bar to bar armature surge testing A Surge Test window similar to the one shown below has been specifically desig...

Страница 185: ...Target test voltage Volts per division scale Micro seconds per division scale Reference to bar EAR percentage tolerance Ensure that a power pack is not enabled and enable the Baker ZTX A Motor ID must also be created for the armature under test Creating a Motor ID is done from the Data tab Nameplate view After saving the Motor ID choose the Test ID that was created for this type of armature NOTE T...

Страница 186: ... Off button in the Surge Test section to turn surge test on Figure 143 Test set up 3 Click on the 500 Volts button in the Surge Test section The Surge Test window will appear Figure 144 Enable Baker ZTX by checking Arm box 4 Ensure that the Enable PP box is not checked then check the ARM box as shown in the example above A new Surge Test window will appear as shown below 172 SKF Static Motor Analy...

Страница 187: ...v If left at Auto the Baker AWAIV will Auto range for the reference wave but set the scale for subsequent tests 7 Enter the desired reference to bar EAR percent the default is set to 10 8 Click the Close button to return to the Test view 9 Click the Save button to save the Test ID 10 Click the Edit Test ID check box to turn off Test ID editing SKF Static Motor Analyzer Baker AWA IV User Manual 173...

Страница 188: ...erence for the remainder of the test and the tester s voltage level No more ramping of the voltage will be necessary do not move the voltage knob 8 A warning message will be displayed warning you that the zero interlock has been disabled for the remainder of the test The next time the Lead 1 button or the footswitch is pressed the leads will be energized at the voltage used by the reference wave F...

Страница 189: ...teps 10 14 for each bar until all bars have been tested A maximum of 1 024 bars can be tested 16 If at any time before you save the full test results you want to retest a bar you can enter that bar number in the Bar Control field or use the up and down arrows to navigate to the bar number and retest as needed Retesting will overwrite the previous data for that bar The Total Bars Tested number give...

Страница 190: ...and yellow 2 The Surge view will also display the saved bars number peak voltage and reference to bar EAR 3 Click on the Enlarge button for a larger version of the surge graph 4 Click on the EAR Graph button for a bar graph of the reference to bar EAR s of all bars tested Figure 148 Surge test results 176 SKF Static Motor Analyzer Baker AWA IV User Manual Using the Baker ZTX with Baker AWA IV anal...

Страница 191: ... and draw a box around the bars you want to enlarge When you release the left mouse button the graph will automatically rescale and display the bars inside of the box you drew 6 To reset the graph click on the Reset button and all bars will be displayed SKF Static Motor Analyzer Baker AWA IV User Manual 177 Using the Baker ZTX with Baker AWA IV analyzers ...

Страница 192: ... to use 4 Click on the Create Report button A report similar to the example below is generated The report generator determines which test results are collected via the normal surge testing process and which are taken using the Baker ZTX It then prints the appropriate graphs for the results and reports chosen Figure 150 Example report generated using parameters set above 178 SKF Static Motor Analyz...

Страница 193: ...eft of the Main window 2 Select the desired filter options 3 Using the Output Report To dropdown list select Ref to Bar EAR CSV file Figure 151 Setting Output Report To Ref to Bar EAR CSV 4 Click on the Print Text File button This will open a File Save dialog box 5 Enter the name of the CSV file for data output Click the Save button 6 The selected records will be written to the file named with the...

Страница 194: ...180 SKF Static Motor Analyzer Baker AWA IV User Manual Using the Baker ZTX with Baker AWA IV analyzers ...

Страница 195: ...nce Repair parts WARNING Electrical shock hazard During repairs do not substitute any parts Use only factory supplied parts to minimize safety hazards Do not modify or repair test leads in any way Defective damaged or broken test leads must be replaced with factory authorized parts to ensure safe operation and maintain performance specifications Step 1 Basic information Record all basic instrument...

Страница 196: ...ntion Applications Common application problems There are a few common application related problems Please review the following cases 1 The Baker AWA IV will not give the desired output test voltage for the apparatus under test 1 1 The test motor may be too large for the instrument being used The impedance of the windings may be too low 1 2 The Baker AWA IV may be at fault in this case Do not conti...

Страница 197: ...tern The coil may be very high in resistance 3 2A broken test lead may be the cause Under heavy use test leads should be checked weekly to ensure that there is no breakage Grasp the boot and clip in one hand while pulling on the lead with the other hand A broken lead will stretch whereas a good lead will not Precautions for proper operation Never raise the output control to attain a display from a...

Страница 198: ...nnections and continuity of the test winding Hipot display checks 1 The hipot display shows only the voltage or current bar One of three problems might exist 1 1The item being tested is in fact faulty and has either low insulation resistance or open connections 1 2The Baker AWA IV has an internal problem 1 3The tester has a test lead problem as shown above for an open condition Disconnect the test...

Страница 199: ...sing a two wire extension cord Is the unit being operated on a transformer isolated circuit If you answer yes to any of these questions the unit is probably operational and indicating that there is open AC line ground connection In the case of numbers 1 3 above use an outlet tester to ensure proper wiring connections to the outlet Limited output surge waveform The display shows a limited output am...

Страница 200: ...ken 1 Connect all leads together clip to clip three red one black ground 2 Place tester in either Meg Ohm or DC HiPot mode Initiate test 3 If the tester immediately shows an overcurrent trip the black test lead is good If the tester continues to ramp up to the test voltage the black test lead is broken Open circuit test to verify tester operation While doing periodic testing there are some instanc...

Страница 201: ...ions Many of these types of software packages when installed on the tester will continue to poll use CPU resources of the computer even when not open on the desktop creating conflicts Baker AWA IV calibration information Baker AWA IV calibration information and documentation can be acquired by calling SKF USA in Fort Collins Colorado at 800 752 8272 or 1 970 282 1200 Please ask a service represent...

Страница 202: ...____________________ Shipping Address ____________________ Phone Number _____________________ Fax ______________________________ From the name plate on the back of the tester Baker Product Number _________________________________ Model Number ____________________________________ Serial Number ____________________________________ Software Version ____________________________________ Description of ...

Страница 203: ...ighlighted and selected items varies depending on the screen design Another method of selection applies to menu labels that have an underlined character For example on the menu bar the File menu has an underlined F Use the Alt key and the underlined key F together to perform the same function as a mouse click on the menu option When Alt F is typed the File dropdown menu appears Shading The shading...

Страница 204: ...ernet support upgrade Baker AWA IVsoftware or other basic features of Windows XP Embedded software When the user shell is employed the only operation of the instrument is within the Baker AWA IV software To switch between these two modes the instrument must be rebooted to activate the mode desired Even within the admin mode of the Windows XP Embedded software most third party software will not loa...

Страница 205: ...e 16 DC High Potential HIPot test specifications Parameter Baker AWAIV 2kV Baker AWAIV 4kV Output voltage 0 2160 Volts 0 4250 Volts Max output current 1000 μamps 1000 μamps Current resolution 1 10 100 1000 μamps division 1 10 100 1000 μamps division Overcurrent trip settings 1 10 100 100 μamps 1 10 100 100 μamps Full scale voltage and current measurement and accuracy 5 5 Meg ohm accuracy 10 10 Max...

Страница 206: ... is reported as a potentially open circuit Table 19 Testing accuracy for HiPot Measurements Range Approximate maximum measurable current Resolution Full scale accuracy 100 μA Div 900 μA 5 10 μA Div 90 μA 5 from 9 μA 90 μA 5 1 μA Div 9 μA 5 from 9 μA 9 μA 5 1 μA Div 9 μA 045 μA 5 from 1 μA 9 μA 10 Table 20 Voltage measurement accuracy Surge test Range Resolution 500 V Div 12 1000 V Div 12 2000 V Di...

Страница 207: ...V HO Output voltage 0 6 000 Volts 0 12 000 Volts 0 12 000 Volts Max output current 800 μamps 800 μamps 800 μamps Current resolution 1 1 10 100 μamps division 1 1 10 100 μamps division 1 1 10 100 μamps division Overcurrent trip settings 1 10 100 100 μamps 1 10 100 100 μamps 1 10 100 100 μamps Full scale voltage and current measurement and accuracy 5 5 5 Meg ohm accuracy 10 10 10 Max Meg ohm reading...

Страница 208: ...eads Range Resolution Full scale accuracy 10Ω 50Ω 1 Ω 5 2Ω 20Ω 1 Ω 5 2Ω 2Ω 05 Ω 5 05Ω 6Ω 005 Ω 5 005Ω 07Ω 0002 Ω 5 001Ω 01Ω 0001 Ω 5 Above 50Ω is reported as a potentially open circuit Table 26 Testing accuracy for hipot Measurements Range Approximate maximum measurable current Resolution Full scale accuracy 100 μ A Div 900 μA or 45 μA 5 from 90μA 900μA 5 10 μ A Div 90 μA 5 from 9μA 90μA 5 1 μ A D...

Страница 209: ...ng Electrical Machinery 5hp to less than 10 000hp IEEE 434 1973 Guide for Functional Evaluation of Insulation Systems for Large High Voltage Machines IEEE 522 1992 Guide for Testing Turn To Turn Insulation on Form Wound Stator Coils for Alternating Current Rotating Electric Machines NEMA MG1 1993 Motors Generators Reprints or EASA standards are available from www easa com 1331 Baur Boulevard St Lo...

Страница 210: ...196 SKF Static Motor Analyzer Baker AWA IV User Manual ...

Страница 211: ...tor_key is the primary keyed field It is automatically generated when a new motor is added The Motor ID field is a unique identifier that the user gives each motor Table 28 Field name descriptions Field name Type Description motor_key Long integer Automatically generated number used as the primary key tree_level_1 Text 25 First level used in the tree view Motor location 1 user defined field label ...

Страница 212: ...tor as to its degree of protection from the environment and method of cooling freq_hz Long integer Input frequency usually 50 or 60 Hz NEMA_design_code Text 4 NEMA codes assigned to define torque and current characteristics of the motor NEMA_nom_efficiency Short This represents an average efficiency of a large population of like motors max_ambient_temp Single The maximum ambient temperature at whi...

Страница 213: ...d in the tree view Motor location 1 user defined field label defaults to Location test_level_2 Text 25 Second level used in the tree view Motor location 2 user defined field label defaults to Building testfor Text 25 Enter the entity for which the motor is being tested testby Text 25 Enter the person who is performing the test on the motor baker_sn Long integer Serial number on the Baker Tester be...

Страница 214: ... install Text 8 Date the motor was installed at the current location basic Text 8 Date when the motor had basic service rewind Text 8 Date the motor was last rewound memo_used Yes No Indicates a memo has been entered Table 30 Temperature test results Field name Type Description temp_status Text 8 Contains the status of the test PASS or FAIL if a test has been performed or blank if no temperature t...

Страница 215: ...o lead 3 resistance resist_31 Double Lead 3 to lead 1 resistance resist_corrected1 Double Corrected resistance for lead 1 resist_corrected2 Double Corrected resistance for lead 2 resist_corrected3 Double Corrected resistance for lead 3 resist_delatR_max Double Max delta resistance test tolerance resist_coil1 Double Coil resistance for lead 1 resist_coil2 Double Coil resistance for lead 2 resist_co...

Страница 216: ...hm value voltage current Meg Ohm_IR_at_40C Long integer Meg Ohms insulation resistance at 40 C Table 33 PI test results Field name Type Description pi_status Text 8 Contains the status of the test PASS or FAIL if a test has been performed or blank if no PI test has been conducted DA Only DPASS DFAIL pi_whyFailed Text 25 Reason why motor failed if it failed pi_voltage Short integer Test voltage for...

Страница 217: ...High Potential HIPot test specifications Field name Type Description surge_status Text 8 Contains the status of the test PASS or FAIL if a test has been performed or blank if no surge test has been conducted surge_whyFailed Text 25 Reason why motor failed if it failed surge_peak_volt1 Short integer Peak voltage reached for lead 1 surge_peak_volt2 Short integer Peak voltage reached for lead 2 surge...

Страница 218: ...ion test_result_no Long integer Foreign key used to link test result records motor_key Long integer Motor Identification key piamps15 Double Current in micro amps 15 seconds piamps30 Double Current in micro amps 30 seconds piamps45 Double Current in micro amps 45 seconds piamps60 Double Current in micro amps 60 seconds piamps90 Double Current in micro amps 90 seconds piamps120 Double Current in mi...

Страница 219: ...s 150 seconds pires180 Double Resistance in Meg Ohms 180 seconds pires240 Double Resistance in Meg Ohms 240 seconds pires300 Double Resistance in Meg Ohms 300 seconds pires360 Double Resistance in Meg Ohms 360 seconds pires420 Double Resistance in Meg Ohms 420 seconds pires480 Double Resistance in Meg Ohms 480 seconds pires540 Double Resistance in Meg Ohms 540 seconds pires600 Double Resistance in...

Страница 220: ...e given test interval step_time Short integer Length of step in seconds step_ramp_rate Short integer Not used at this time step_min_Meg Ohm Long integer Minimum Meg Ohms aloud for the step Meg Ohm_at_endstep Long integer Meg Ohm value at the end of the step current_at_endstep Double Current in micro amps at the end of the step voltage_1sec Memo Comma delimited field containing the voltage for each...

Страница 221: ...t used at this time wave1Full Full waveform for lead 1 wave1Mid Middle waveform for lead 1 wave1Min Minimum waveform for lead 1 wave1PrevFail Wave form before the failed waveform for lead 1 wave1ppEAR Pulse to Pulse EAR for lead 1 wave2Full Full waveform for lead 2 wave2Mid Middle waveform for lead 2 wave2Min Minimum waveform for lead 2 wave2PrevFail Wave form before the failed waveform for lead 2...

Страница 222: ...pi_enabled Yes No PI test 1 on 0 off HiPot_enabled Yes No HiPot test 1 on 0 off prgHiPot_enabled Yes No Step Voltage Test enabled 1 on 0 off surge_enabled Yes No Surge test 1 on 0 off Table 41 Test results parameters table temperature test parameters field descriptions Field name Type Description temp_isAuto Yes No 1 Manual 0 Automatic temp_degF_C Yes No 1 F degrees 0 C degrees Table 42 Test resul...

Страница 223: ...rget_coilRes Double Coil resistance to compare tested value with resist_target_coilRes_tolerance Long integer Tolerance set for target coil resistance Table 43 Test results parameters table Meg Ohm test parameters field descriptions Field name Type Description Meg Ohm_test_voltage Short integer Target voltage of test Meg Ohm_min_Meg Ohm Short integer Minimum Meg Ohm value Meg Ohm_test_time Short i...

Страница 224: ...teger Number of minutes to discharge pi_PowerPack_enabled Yes No 1 PP enabled 0 No PP Table 45 Test results parameters table HiPot test parameters field descriptions Field name Type Description HiPot_test_voltage Short integer Target voltage of test HiPot_min_Meg Ohm Short integer Minimum Meg Ohm value HiPot_test_time Short integer Length of test HiPot_ramp_rate Short integer Ramp rate HiPot_trip_...

Страница 225: ...er pack 4000 3 2000 w power pack 8000 4 Auto scale surge_PauseBetweenLeads Yes No 1 Yes pause 0 No do not pause surge_zero_enabled Yes No Zero tolerance error checking on off surge_zero_percent Short integer Zero tolerance percent surge_EAR_enabled Yes No EAR checking on or off surge_EAR_percent Short integer EAR error tolerance surge_ppEAR_enabled Yes No Pulse to pulse EAR error checking enabled ...

Страница 226: ...testid field is a unique Identifier that the user gives each set of test criteria to Identify what motor s is meant to be tested Such as 480 V w o PI Table 48 Test ID table field descriptions Field name Type Description test_key Long integer Automatically generated number used as the primary key testId Text 25 Test identification datetime_modified Date Time Date and time stamp as to when a Test ID...

Страница 227: ...ys false 0 No external testing resist_isAuto Yes No 1 Automatic 0 Manual resist_4lead_test_enabled Yes No 1 4 lead test enabled 0 4 lead test disabled Only disabled at this time resist_correct_to_temp_enabled Yes No Correct resistance 1 Yes 0 No resist_temp_correct_to Short integer Defines the value that the resistance temperature will be corrected to resist_temp_correct_factor Double Default 234 ...

Страница 228: ... Short integer Target voltage of test pi_min_Meg Ohm Short integer Minimum Meg Ohm value pi_min_ratio Double Length of test pi_ramp_rate Short integer Ramp rate pi_trip_level Short integer HiPot trip value pi_da_only_enabled Yes No 1 DA only anything else PI pi_revert_to_da_enabled Yes No pi_discharge_multiplier Short integer Number of minutes to discharge pi_PowerPack_enabled Yes No 1 PP enabled ...

Страница 229: ...ivision 0 250 w power pack 1000 1 500 w power pack 2000 2 1000 w power pack 4000 3 2000 w power pack 8000 4 Auto scale surge_PauseBetweenLeads Yes No 1 Yes pause 0 No do not pause surge_zero_enabled Yes No Zero tolerance error checking on off surge_zero_percent Short integer Zero tolerance percent surge_EAR_enabled Yes No EAR checking on or off surge_EAR_percent Short integer EAR error tolerance s...

Страница 230: ... 0 Not enabled Step Voltage test ID table TestIdPrgHiPot Table 56 Step Voltage Test ID table fields descriptions Field name Type Description test_key Long integer Test identification key test_voltage Long integer Voltage for this step min_Meg Ohm Short integer Minimum Meg Ohm value for this step test_time Short integer Length of time for this step ramp_rate Short integer Ramp rate for this step pr...

Страница 231: ...form record Xscale Integer Scale index for the x axis micro seconds per division Yscale Integer Scale index for the y axis volts per division MicroSecPerPnt Double Microseconds per point Not used at this time VoltsPerPnt Double Volts per point Not used at this time peak_volts1 Short integer Peak voltage reached for lead 1 peak_volts2 Short integer Peak voltage reached for lead 2 peak_volts3 Short ...

Страница 232: ...and so on tree_level_1_field_name Text 10 Motor Location field used for this database default is Location The record with the most recent date contains the field description used tree_level_2_field_name Text 10 Motor Location field used for this database default is Building The record with the most recent date contains the field description used Work list table Route Table 58 Work list table field...

Страница 233: ...e 59 Motor voltage class table fields descriptions Field name Type Description motor_voltage_class Long integer Voltage class 480 4160 and so on class_description Text 64 Voltage class description SKF Static Motor Analyzer Baker AWA IV User Manual 219 ...

Страница 234: ...220 SKF Static Motor Analyzer Baker AWA IV User Manual ...

Страница 235: ...esult Fail DELTA R Delta R percent is out of tolerance FAIL OPEN LEADS Test results Fail OPEN LEADS Open Leads Detected FAIL TOLERANCE Test Results Fail TOLERANCE Resistance s outside of user defined targeted range CAUTION Reistance out of range Resistance values must be greater than 0 500 ohms for HIGH VOLTAGE LEADS and greater than 0 001 for the RES LEADS You may stop Testing reconfigure Test ID...

Страница 236: ... this Test ID FAIL Low PRG HPT voltage The last step voltage is below the previous Meg Ohm PI test voltage Surge test failure types Non VFD issues causes and actions with autophasing feature turned on Status Failure type Why failed message FAIL Open leads Test Results Fail OPEN LEADS Open leads detected FAIL Over voltage Over Voltage Condition has been detected FAIL Open ground An open ground has ...

Страница 237: ...toring purposes Meg Ohm 1 Meg Ohm is 1 000 000 Ohms 1 million Temperature compensation It is an established fact that the temperature of the environment has a direct influence on the measurement of both electric coil resistance and the insulation systems used to maintain the paths where electric current will flow In the case of electric coils increased heating leads to an increase in the apparent ...

Страница 238: ...C Hipot The test is comprised of a smoothly rising ramped voltage The rate of rise may be as slow as 5 volts per second During the rise to the target voltage the leakage current is constantly monitored and plotted Discontinuity or non linear responses of the leakage can reveal weak or compromised insulation By virtue of this technique reduced risk of over current trip and damaging apparatus under ...

Страница 239: ... Full name Pulse to Pulse Error Area Ratio This term is used to describe an enhanced real time technique that is primarily used to detect electrical weakness in turn to turn insulation in electric coils It functions based upon successive sampling of the measured wave shape Variations in successive wave shapes are analyzed and the EAR between them is plotted Zero crossing This technique is selectab...

Страница 240: ...226 SKF Static Motor Analyzer Baker AWA IV User Manual Glossary ...

Страница 241: ... turn short 146 Armature preparation 170 Armatures 136 Baker AWA IV 6 kV 12 kV model front panel 13 Baker AWA IV calibration information 187 Baker AWA IV troubleshooting 181 B Baker AWA IV admin or user shell 190 Baker AWAI V 2 kV 4 kV model front panel 11 Baker AWA IV 2 kV 4 kV specifications 191 Baker AWA IV 6kV 12kV and 12kVHO tester specifications 193 Baker AWA IV instrument overview 11 Baker ...

Страница 242: ...ase test lead power pack 157 Configure Meg Ohm PI HiPot tests 88 Configure surge test 89 Configure temperature resistance test 87 Configuring a surge test using the Baker ZTX 172 Connecting Baker AWA IV to the Baker ZTX accessory 170 Consequences of not organizing data 61 Contact bounce 128 Converting an older database 72 Converting the data 73 Creating a motor ID 83 Creating a new database 16 62 ...

Страница 243: ...urn turn fault 115 Fine tuning the technique 105 footswitch 75 formatting 1 Form coils 131 G General operation maintenance and service information 8 Generating CSV files 179 Generic test IDs versus specific test IDs 90 Glossary of terms 223 Good stable trace 146 H Hard short to ground 147 Help menu 23 High potential HiPot test 123 Hi L in Baker AWA IV 2 kV and 4 kV 103 Hipot 58 224 Hipot display c...

Страница 244: ...C stator motors 139 Notes and tips for span tests of armatures 137 Notes and tips for testing from the switchgear 142 O Open circuit 147 Open circuit test to verify tester operation 186 Open condition display 184 Open ground check 185 Opening an existing database 17 63 Operating and shipping positions 10 Operating position 154 Overcurrent trip test 186 P Performing an example test 82 PI 58 Polariz...

Страница 245: ...autions 4 Scroll bars and Windows icons 190 Selecting items 189 Self help and diagnostics 181 Service What to do first 184 Setting up test parameters for a reference waveform 52 Setting up the Baker AWAIV tester 75 Shading 189 Single phase motors and two terminal devices 131 Single phase transformers 143 Software basics and installation 189 Software fault messages 150 221 Software installation 190...

Страница 246: ...ad power pack 155 Test results parameters table TestResultsParameters 208 Test results table TestResults 199 Text fields 189 The first time version 4 software is used 18 Third party software warning 187 Three phase motors 132 Three phase transformers 144 Toolbar 24 Tools menu 23 Transferring motor and test result data 65 Transferring test IDs 68 Transformers 143 Two or more single coils 132 Typica...

Страница 247: ...nding tab 55 V Version 4 0 database definition 197 Viewing surge results 54 Viewing test data 29 View menu 21 W Warranty return 187 Warranty return form 188 Window menu 22 Work list table Route 218 Wound rotor motors 134 Wye wound resistance measurement 45 Z Zero Crossing 225 ...

Страница 248: ...234 SKF Static Motor Analyzer Baker AWA IV User Manual Index ...

Страница 249: ......

Страница 250: ...extracts unless prior written permission is granted Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct indirect or consequential arising out of the use of the information contained herein PUB CM I4 71 015 EN Baker AWA IV User Manual Vk January 2014 www skfusa com electricmotortesti...

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