DC-12M Balancing Program User Manuals
Contents
1. Once youpressed theSavebutton thereportwill be savedas File bal001 log The data collector can store a number of reports whichis differed by an order number For example youcan save reports of sequential balancing cycles for the given machine See Section 1 2 of Appendix 1 for information onthe storing and printing the reports using the PC After you view over the Balancing Report and select theSave button to save the report or theDiscardbutton to don t save it the Job Type screen appears JOB TYPE 11 50 34 FINISH BALANCING NEW BALANCING Using this screen youmay Finish Balancing the balancing forthe given machine is terminated andthe current data are deleted excluding the balancing report The program goes to the Balancing Setup screen VAST BAL DC OM User s Manual 33 Start New Balancing In this case no need to measure the initial vibration because the program takes the lastresults of the Test Measurement and go at once to the Balancing Mode Select screen Fig 3 29 BALANCING MODE SELECT 11 50 45 CONTINUE BALANCING BALANCING BY INFLUENCE COEFFICIENTS PREVIOUS This screen allows you to select one ofthe next options Continue Balancing brings youto the Trial Weight 1 screen Balancing by Influence Coefficients you getto the Influence Coefficients Input screen see section 3 4 Previous bringsyoutothe Vibration Measurement Results screen with initial vibration2. TACHO SIGNAL ANALYSIS AUTO MEASUREMENT CONTROL AUTO ANGLE READING DIR WITH ROTATION LNEXT This dialog is used to setup a new balancing operation Here you can enter the name of the machine to be balanced as well as parameters of measurement and balancing weightattachment During balancing measurements the DC 12 uses automatic analysis of thetacho and vibration signals As soon as the desired measurement accuracy will be achieved the measurements will be stopped or warning messages will be issued Here youcan set the following parameters VAST BAL DC 12M Machine ID Number of Measurement Points Amplitude Units Detector Rotation Speed Tacho Signal Analysis Measurement Control User s Manual 13 Amachinename may contain up to characters Use the alphanumeric keys to enter the machine name Each ofthe keys has 4 characters that scroll while pressed For example to enter 1 press the 1 key once to enter A press 1 key twice etc Use the left arrow for backspace and the right arrow to move to the next character This is thenumber of points at which you will measure the vibration amplitude Thenumbercan be entered from the keypad or changed by using left right keys Using the left right arrows choose the units you prefer for amplitude represen tation Choices are G m s2 mm s vm in s mils With the left right arrows choose the detector to be used for graph represen tation eit
3. 34 J PHASE SENSITIVITY degree 215 127 NEXT Usingtheup downarrows you can select the Measurement point and press the lt Enter gt key to goto the measurement screen for the selected point In this way youcan repeat the measurement procedure Ifyou press the lt Cancel gt key the program goes to the Main Menu In this case you may save your data Ifthe vibration response to the trial weight is low and you want to leave the weight in place once you have selected removing it use the Previous button to getback to the Trial Weight screen and change the weight attachmenttype You need not to repeat measurements VAST BAL DC 12M Fig 3 9 Fig 3 10a User s Manual 23 The sensitivity column shows whether or not vibration response to the trial weight occurs at all measurement points Ifnot the Low Sensitivity screen appears after you pressed the Nextbutton 11 50 34 LOW TRIAL WEIGHT SENSITIVITY POSSIBLE MISALIGNMENT OR SHAFT BEND CAN NOT CALCULATE CORRECTION WEIGHTS TRY TO INCREASE TRIAL WEIGHT AND REPEAT TRIAL RUN OR CORRECT THE SHAFT DEFECT REPEAT TheRepeatbutton brings you the screen to enter trial weight parameters the lt Cancel gt key allows you to go to the Main Menu After the trial weights are mouted at the second and third planes the check is done on balancing planes equal by vibration response If such planes are detected the Equal Balancing Planes screen
4. Enter gt The Sum Weights screen appears Fig 4 6 SUM WEIGHTS 11 50 34 WEIGHT ANGLE GR DEG WEIGHT 1 0 WEIGHT 2 90 SUM 45 NEXT Youcansee above an example ofaddition with one weight of 100 g 90 degrees and another weight of 100 g 0 degrees The program recommends to mount the summary weight of 141 gat45 degrees VAST BAL DC OM User s Manual 39 APPENDIX 1 HOW TO USE THE VAST PT 1 PHOTOPROBE FOR BALANCING MEASUREMENTS To measure vibration parameters with the DC 12 the VAST PT 1 photoprobe is available for use as an auxiliary equipment It is shown in Fig below Fig Al Cabling this probe to the DC 12 use the Tacho input on the input panel of the device This input is also used to power the photoprobe thus it is notrequired additional power supply On the rear panel of the photoprobe there is a status led While the probe transfers a signal the ledis lighting that indicates the proper state and mounting of the probe 40 APPENDIX 2 User s Manual VAST_BAL DC 12M APPLICATION SOFTWARE TO LOAD THE BALANCING PROGRAM TO THE DATA COLLECTOR dcl Warning The application software is installed onto the PC and provide loading the balancing program onto the DC 12 ItconsistofProgramDC__sfx exewhich unpacks the file while you start setup and creates program files dcle exe dclr exe dclwe exeanddclwr exein the program folder The letter meaning is data collector the prog
5. different machinetypes is considerably depending on their dimensions and type support and bearing stiffness and the machine operation modes The operation modes may differ by rotating speeds loads and temperature conditions One of the common causes for the excessive vibration atthe rotation frequency is bend shaft line shaft misalignment and some other defects Hence before balancing itis recommended to check couplings shaftline and fix the problems since their presencemakes balancing impossible Whenever possible a machine oughtto be balanced at its operation speed If not choosetheclosestto that You mustavoid balancing at critical shaft speeds because the measurements of magnitude and phase taken under these condi tions are inaccurate and cannot provide effective balancing When balancing fans pumps and turbines itis strongly recommended to clean them up before you start balancing procedure After that you may sometimes find that unbalance disappeared 1 4 SINGLE PLANE User s Manual VAST_BAL DC 12M AND MULTIPLANE UNBALANCE Fig 1 1 Single plane unbalance Fig 1 2 Dual plane unbalance The single plane unbalance is usually called the static unbalance This type of unbalance can be illustrated by an unbalanced disk placed on the balanced shaft in two bearing supports as shown in the next figure Heavy spot Multiplane unbalance can be referred to as the dynamic one because it occurs only during rotation It occu
6. placed to increase efficiency There may be several steps of Trim balancing See Section3 3 terminates balancing and process its results The program goes to the Balancing Report see Section 3 4 which contains several screens By theNextbutton youcan view over eachscreenful Using the Previous button you can go back to the Measurement Results screen 28 User s Manual VAST_BAL DC 12M 3 3 TRIM BALANCING Trim balancing is a correction of the balancing weights value Itis performed after the balancing made and balancing weights attached Itis not required to place the trial weights as wellas thetrial runs atall This job can be chosen from the Balancing Mode Select screen after the test measurement is taken Fig 3 17 BALANCING MODE SELECT 11 50 34 TRIM BALANCING FINISH Ifyou have selected this mode the Correction Weights screen would appear Fig 3 18 CORRECTION WEIGHTS 11 50 34 ESTIMATED VIBRATION m s 0 052 ANGLE READING DIR WITH ROTATION PLANE WEIGHT ANGLE GR DEG 1 075 182 NEXT This screen displays the correction weights calculated by the program To proceed with balancing place the weights which actual value must be much more closetothe calculated Pressing theNextbutton displays the Balancing Mode Select screen appears VAST BAL DC 12M Fig 3 19 User s Manual 29 BALANCING MODE SELECT 11 50 34 CONTINUE BALANCING TEST MEASUREMENT SUM WEI
7. results You can eitherrepeatthe measurement by pressing the up arrow button and selecting a point to measure confirm your choice by the lt Enter gt key or pressNext which is selected by default to continue the balancing 3 5 BALANCING BY INFLUENCE COEFFICIENTS This job can be used after the initial vibration measurement made or after the previous cycle of balancing is terminated by pressing theNew Balancing button This section describes the succession of steps of balancing by influence coefficients with the DC 12 balancing program This screen enables you to select a balancing type Fig 3 30 BALANCING MODE SELECT 11 50 34 CONTINUE BALANCING BALANCING BY INFLUENCE COEFFICIENTS PREVIOUS User s Manual VAST_BAL DC 12M SelectBalancing by Influence Coefficientsand press lt Enter gt The Influ ence Coefficients Input screen appears Fig 3 31 INFLUENCE COEFFICIENTS INPUT 11 50 34 PLANE NUMBER 1 1 L 0 000e 00 J L 0 000e 00 PREVIOUS NEXT LCALCULATE Inthis screen youcan enter the influences coefficients that have been saved for this machine The order of coefficients must be the same as it was in the Influence Coefficients screen of the Report Fig 3 26 To go to the next plane press theNextbutton Youcan return to the previous screen by thePreviousbutton To confirm your input press theCalculatebutton The Correction Weights screen appears Fig 3 32 CORRECTION W
8. the angle 0 There are utilities you may call from this screen The utility allows you to estimate a trial weight by machine parameters Apply toSection 4 1 for details The command to replace two weights mounted at one plane with one weight which produce the same vibration response See section 4 3 for comments Thecommandallows you to splita single weight which should be mounted at ahardly available location into several weights by two available locations See section 4 4 for details This is a common case for fans and other bladed machines where you can not mount a weight between blades but can attach weights to the blades See section 4 2 for comments Using the Previous button you may go to the previous screen Balancing Mode Select User s Manual VAST_BAL DC 12M Tocontinue your job choose theNextcommand whichis available only after you entered the required parameters The Vibration Measurement screen Fig 3 7 Fig 3 8 appears again as follows VIBRATION MEASUREMENT TRIAL WEIGHT NUMBER MEASUREMENT POINT NOT MEASURED PREVIOUS START 11 50 34 1 1 NEXT Press theStartbutton and measure the vibration response to the trial weight Press theNextbutton and thenext similar screen appears for the next point After all measurements are over the Measurement Results screen appears MEASUREMENT RESULTS TRIAL WEIGHT POINT AMPLITUDE mm s 1 5 75 2 13 16 11 50
9. the previous screen the initial Vibration Measurement screen is displayed Fig 3 2 VIBRATION MEASUREMENTS 11 50 34 INITIAL VIBRATION MEASUREMENT POINT NOT MEASURED PREVIOUS START STOP To initialize the measurement process choose theStartbutton VAST BAL DC 12M Fig 3 3 Fig 3 4 User s Manual 19 The same screen after the measurement made VIBRATION MEASUREMENT 11 50 34 INITIAL VIBRATION MEASUREMENT POINT AMPLITUDE m s PHASE DEG SPEED Hz MESSAGES PREVIOUS START NEXT The screen shows the numerical value ofthe vibration vector atthe current measurement point Ifneeded you may interruptthe measurement process with the Start Stop command To proceed with an iterrupted measurement use the same command To check signal quality after a manual break the signal variance is shown in per cent The screen allows you also to enter data with the keyboard To set focus onan input field use the up downarrows then enter you data On conclusion press the lt Enter gt key to select the Next command Afterthe measurement is automatically finished ifno messages were on either measurement errors or inaccuracy you must press theNextbutton The similar screen will be displayed for the next pointnow If youneed to view the previous measurements press the Previous button After the initial vibration data are taken the Vibration Measurement Results screen will be disp
10. this use theSum Weightssubprogram see section 4 3 You go to this subprogram from the Job Type screen which is displayed after correction weightcalculation Fig 2 12 JOB TYPE 11 50 34 CONTINUE BALANCING TEST MEASUREMENT SUM WEIGHTS SPLIT WEIGHT PREVIOUS VAST BAL DC 12M User s Manual 17 Theutility allows you to calculate parameters of the required correction weight To do so select the calculated correction weight as the first part of the summed select the trial weight leftin place as the second part of the summed Note that to put a minus sign before it you need to press the dot key lt yyye gt The computed weight should be attached as the correction one 18 User s Manual VAST_BAL DC 12M 3 OPERATING THE DC 12 BALANCING PROGRAM This section covers an entire balancing cycle using the DC 12 balancing program starting from measurement setup to balancing conclusion 3 1 HOW TO SET UP BALANCING The Balancing Setup screen with selected parameters is shown below Fig 3 1 BALANCING SETUP 11 50 34 MACHINE ID L NUMBER OF MEASUREMENT POINTS 1 AMPLITUDE UNITS m s DETECTOR TYPE PEAK SHAFT SPEED Hz TACHO SIGNAL ANALYSIS AUTO MEASUREMENT CONTROL AUTO ANGLE READING L WITH ROTATION LNEXT Thenext command displays the Point Channel screen See Section 2 4 formore information 3 2 BALANCING PROCEDURE After you have selected Next in
11. BALANCING SOFTWARE FOR THE DC 12M VIBRATION ANALYZER Ver 3 79 USER S MANUAL Copyright 2000 2004 Inteltech Enterprises Inc Copyright 2000 2004 VAST Inc VAST BAL DC 12M User s Manual CONTENTS 1s BALANCING RE e 2 1 1 INTRODUCTION WEE 2 1 2 WHAT IS A MACHINE UNBALANCE 0 cece cece eee ee teen eea een enaes 3 1 3 BALANCING EE 3 1 4 SINGLE PLANE AND MULTIPLANE UNBALANCE teens 4 1 5 THE METHOD OF BALANCING WEIGHTS ANALYSIS eee 5 2 DC 12 BALANCING PECULIARITIES academie arms ones etsanineninineiel 6 2 1 E eren Ee TE 6 2 2 HOW TO PREPARE THE DC 12 FOR BALANCING eens 8 2 3 SAVING YOUR DATA E 10 2 4 BALANCING SETUP OVERVIEW nitrate inosieriata 12 2 5 VIBRATION MEASUREMENTS naines ere 15 2 6 ATTACHMENT OF THE TRIAL AND CORRECTION WEIGHT 16 3 OPERATING THE DC 12 BALANCING PROGRAM JR 18 3A HOW TO SET UP BALANCING WEE 18 3 2 BALANCING PROCEDURE egener ege 18 3 9 TRIM BALANGING ET 28 Ste FINISH BALANCING E 29 3 5 BALANCING BY INFLUENCE COEFFICIENTS s same 33 4 SUPPORT RE LE 35 4 1 TRIAL WEIGHT ESTIMATION sicttcnearntvnnurentevectseenteureisnneneynemnresuuenty 35 DATE EE 37 4 95 SUM KO En MEET 38 APPENDIX OR PP P e A ATA AE 39 HOW TO USE THE VAST PT 1 PHOTOPROBE FOR BALANCING MEASUREMENTS sereerieerierrrrrrrrrrerrerrrerrrerrns 39 Ger 40 APPLICATION SOFTWARE TO LOAD THE BALANCING PROGRAM TO THE DATA COLLECTOR E 40 APPENDIX Sorra sieni e E a A a A A E SAAN 41 APPLICATION SOFTWARE TO LOA
12. D AND STORE BALANCING REPORTS 41 User s Manual VAST_BAL DC 12M 1 BALANCING BASICS 1 1 INTRODUCTION This manual describes the balancing procedure using the DC 12 data collector This instrument s inner balancing program can be very useful for balancing rotors with up to 3 balancing planes or weight attachment planes and up to 8 measurement points Aside from computation of balancing parameters weight and angle magnitudes the software provides the following CT automatic monitoring ofmeasurementparameters and measurement accu racy CT continuous automatic monitoring ofthe tacho signal along with initerrupting measurement process ifthe signal gets unstable O estimation of vibration response to the trial weights at each measurement point CT automatic test for balancing planes which are equal by vibration response and exluding one of them from calculation Balancing by three non equal planes O balancingusing only necessary balancing planes but not maximum number of them CT computation of the expected viration response to the calculated corrective weights O balancingis possible even thougha harmonic noise is present at frequency resolution of 0 01 per cent CT balancing by the known influence coefficients trim balancing with no trial runs O balancing both by the knowninfluence coefficients and trial weights at once O balancing with trial weights eitherremoved or leftin place You may select one of the above
13. EIGHTS 11 50 34 ESTIMATED VIBRATION m s ANGLE READING DIR WITH ROTATION PLANE WEIGHT ANGLE GR DEG 1 NEXT The next steps have been described in Section 3 3 VAST BAL DC 12M User s Manual 35 4 SUPPORT PROGRAMS 4 1 TRIAL WEIGHT ESTIMATION Fig 4 1 Fig 4 2 This section describes the additional programs that are included in the DC 12 balancing program but not employed directly with corrective weights calcula tion One of the most difficult operations in balancing isthe choice of the trial weight amount Ifitis small theresponse might be comparable to ameasurement error and the calculation would be impossible Too big a weight may cause the machine breakdown The optimum method is to determine trial weights experience in balancing this machine type Ifyou donothave this experience werecommend using the Trial WeightEstimationutility TRIAL WEIGHT 11 50 34 TRIAL WEIGHT 1 ATTACHMENT TYPE TEMPORARY ANGLE READING DIR WITH ROTATION WEIGHT GR 0 000 ANGLE DEG L 0 NEXT TRIAL WEIGHT ESTIMATION SUM WEIGHTS SPLIT WEIGHT PREVIOUS After you selected the Trial Weight Estimation command and pressed lt Enter gt the Trial Weight Estimation screen appears TRIAL WEIGHTS ESTIMATION 11 50 34 ROTOR WEIGHT KG 100 000 RADIUS mm 100 0 WEIGHT GR NEXT 36 Rotor Weight Radius User s Manual VAST_BAL DC 12M Fo
14. GHT SPLIT WEIGHT Continue Balancingis not available The DC 12 program made balancing by cycle Eachcycle begin either with balancing or with balancing by influence coefficients and continue through trim balancing To begin new balancing you need to finish your job by theTest Measurementcommand After the test measurement made and Report presentation the Job Type screen appears see Fig 3 28 through which you can start new balancing cycle In this case the test measurement results will be considered as the initial vibration one By using the Test Measurement command you may repeat trim balancing up to 5 times or go to the new balancing 3 4 FINISH BALANCING Fig 3 20 Toend up the balancing cycle chooseFinishfrom the Job Type screen Fig 3 16 You will be enabled to view over a Balancing Report which contains several screens By theNextbutton you can view over each screenful All the data entered or obtained during this balancing cycle will be present inthe report Anexample of this is shown in the next figures BALANCING REPORT 11 50 34 DATE 05 02 98 MACHINE ID 444 NUMBER OF MEAS POINTS 1 NUMBER OF PLANES 1 AMPLITUDE UNITS um DETECTOR RMS ROTATION SPEED RPM ANGLE UNITS DEG ANGLE READING DIR WITH ROTATION ROTATION SPEED 9520 97 RPM PREVIOUS LNEXT 30 Fig 3 21 Fig 3 22 Fig 3 23 User s Manual VAST_BAL DC 12M INITIAL VIBRATION POINT AMPLITUDE PRE
15. SHUT DOWN SAVE STATUS amp SWITCH OFF SWITCH OFF SAVE STATUS CANCEL Using the up down arrow keys choose an options Use this command to save all data and switch offthe DC 12 Next time when youswitch iton the screen is displayed you exit from Use this command incase you wantto switchoffthe DC 12 butnotto save your balancing data Use this command to save all data to nonvolatile memory of the instrument without switching offthe DC 12 itself Youmay use this command to backup your data at times to be sure they cannot be lost You escape to the screen where you try to switch off the device If you have interrupt the balancing application by the lt Cancel gt key the Balancing Cancel screen displayed Typically by using the lt Cancel gt on the DC 12 youexit the current program i e balancing In ordernotto loose essential data you will be prompted first to save the measured and entered data These data can be used later if you are not finished balancing a machine and may wish to continue balancing VAST BAL DC 12M User s Manual 11 Fig 2 6 BALANCING CANCEL 11 50 34 LEXIT TO MAIN MENU LSAVE STATUS amp EXIT LSAVE STATUS TL CANCEL Using theup down arrow keys select the command of interest and press the lt Enter gt key Exit to Main Menu Thecommandtoexittothe Applications menu without saving data Save Status amp Exit Itsaves balancing data and exit to the main menu of
16. T MEASUREMENT POINT NOT MEASURED PREVIOUS START NEXT 26 Fig 3 14 Fig 3 15 User s Manual VAST_BAL DC 12M Below you can see the same screen after the measurement made VIBRATION MEASUREMENT 11 50 34 TEST MEASUREMENT MEASUREMENT POINT AVERAGE NUMBER AMPLITUDE PHASE SPEED MESSAGES PREVIOUS START NEXT Displayedare the results ofvibration measurementafter the corrective weights have been placed After the measurement made the Measurement Results screen appears MEASUREMENT RESULTS 11 50 34 TEST MEASUREMENTS SPEED RPM POINT AMPLITUDE m s2 1 5 75 2 13 16 NEXT Using the up down arrows you can select the Measurement point and press the lt Enter gt key to go tothe measurement screen for the selected point So youcan repeat the measurement procedure If you press the lt Cancel gt key the program goes to the Main Menu In this case you may save your data After you pressed theNextbutton the program goes to the Job Type screen VAST BAL DC 12M Fig 3 16 Trim balancing Finish User s Manual 27 JOB TYPE 11 50 34 L TRIM BALANCING LFINISH PREVIOUS This screen provides you to select from the following options Ifthe intended balancing efficiency havenotbe achieved you can increase itby this command The command calls the Correction Weights screen which displays the weights to be
17. VIOUS 18 27 53 NEXT TRIAL WEIGHT NUMBER 1 WEIGHT 300 000 ANGLE POINT AMPLITUDE um 1 7 1014 PREVIOUS 18 30 30 5 TEMPORARY PHASE DEG 356 NEXT CORRECTION WEIGHTS WEIGHT PLANE No 1 359 131 PREVIOUS 18 33 38 ANGLE 2 NEXT VAST BAL DC 12M Fig 3 24 Fig 3 25 Fig 3 26 User s Manual 31 ACTUAL WEIGHTS ATTACHED PLANE No WEIGHT 1 2 000 PREVIOUS 18 34 52 ANGLE 0 LNEXT TEST MEASUREMENT 1 POINT 1 PREVIOUS 18 36 52 PHASE 6 NEXT INFLUENCE COEFFIC PLANE No 1 1 1 041e 01 PREVIOUS 18 37 54 332e 05 NEXT This screen shows the influence coefficients which have been calculated during the balancing for each weight attached 32 Note Fig 3 27 Fig 3 28 User s Manual VAST_BAL DC 12M These coefficient should be saved to balance the given machine by the known influence coefficients withouttrial runs Itcan be made by writing down them or printing the report Keep the order of coefficients to be successful END OF BALANCING REPORT 16 87 26 YOU JUST REACHED THE END OF BALANCING REPORT NOW YOU CAN CHOOSE SAVE OPTION TO SAVE THE REPORT FOR FUTURE USE UNDER THE NAME pal002 log YOU CAN PRINT IT OR VIEW AT HOST PC USING DEDICATED SOFTWARE TOOLS PREVIOUS SAVE DISCARD
18. after measurement data on the trial weight is available O preliminary estimation of trial weights by the parameters of the machine under balancing CT optional keyboard input formeasurement data O splitting the correction weights ifimpossible to place the calculated weight atthe determined mounting angle O adding the weights mounted at the same plane O balancing reporting VAST BAL DC 12M 1 2 WHAT IS User s Manual 3 A MACHINE UNBALANCE 1 3 BALANCING Unbalance ofa rotating part of the machine is uneven mass distribution the offset between the shaft center of mass and center ofrotation Whilerotating any masses are influenced by inertial forces but without unbalance those forces are compensated When unbalance occurs these forces are not fully compen sated and therotor is influenced by the forces at operating speed of the machine Unbalanceis the nature ofany rotating object andis presentalways Therefore in engineering there is a distinction between acceptable unbalance whena machine can be operated and the excessive one that leads to defects and the defect development and may cause a machine failure Balancing is the proce dure for correction of the latter Worth to mention that as well as you reduce vabration by balancing you increase rotor loading that may cause its failure Therotor unbalance can be detected by the presence ofa great component of machine vibration at its operating speed Acceptable unbalance in
19. g Dir Fig 2 10 Attention User s Manual VAST_BAL DC 12M If the intended measurement accuracy is not achieved the measurement process will be stopped automatically after 30 averages After that the DC 12 suggests a possible cause of measurement inaccuracy such as Random noise detected Harmonics noise detected Ifmeasurement process is interrupted by the operator the following message is displayed Measurement is stopped Ifless than 3 readings have been taken they whould be skipped Using the left right arrow keys you can select an anglereading direction with or againstrotation The angle readings are used for trial and balancing weight attachment After you set up the measurements selectNextand press lt Enter gt to accept your settings and continue the balancing procedure The Point Channel screen willbe displayed 11 50 34 PREVIOUS NEXT The screen is used for a multi channel adapter to set one to one correspon dence between measurement points and channels Since there is no indication at Vibration Measurement screen for any channel number it is recommended to use the same channel numbers as for measure ment points Note that one channel may bealso used to access several points This software version assumes that sensor sensitivities are the same and equal to the one chosen in the Transducer sectionof the Settings menu Main menu gt Utilities gt Settings Ifone channel adapter i
20. he estimated vibration levelis the maximum vibration value in all measurement points make a decisionon whether terminating trial runs and going to the correction weight mounting or mount the next trial weight ifthe estimation is more than needed Ifyoumake decision to continuethetrialruns place thenexttrial weightand repeat the previous steps 10 After youare satisfied with the estimated balancing efficiency or you have done all trial runs placed all trial weights in all possible planes atmost 3 attach the determined corrective weights VAST BAL DC 12M User s Manual 7 11 Measure vibration parameters in all points By the measurement data the program computes the additional correction weights and vibration re sponse to them Make decision on the basis of the computation whether to finish at all or start the new balancing cycle or continue to measure after mounting the calculated weights Ifexpectancy is great enough vibration would bereduced 1 5 2 times youmay mount calculated weights and take mesurement data once againas wellas calculation ofcorrection weights and balancing efficiency Ifthe expectancy is small youmay e terminate the balancing cycle withthe current machine while the number of measurement points is greater than the number of balancing planes the balancing efficiency is limited even theoretically e continue mounting trial weights if there balance planes yetunused e makeonemore fullbalancing cyclei
21. he same location and position as it was in the previous balancing cycle The mark for tacho also should be in the same location of the shaft better use a stationary mark User s Manual VAST_BAL DC 12M 2 DC 12 BALANCING PECULIARITIES 2 1 BALANCING STEPS OVERVIEW This chapter covers main steps of the field balancing using the DC 12 s balancing software including computation of balancing weights Balancing a machine with the DC 12 inner software involves the following essential operations J Prepare the places in all measurement points to mount the accelerometer Place the phase reference mark on the rotating part of the machine and attach the phase reference tacho probe Check the tacho signal with the command Tacho Test from Applications menu This allows youto view the tacho signal in the oscilloscopemode The pulses must be evently spaced Ifthe signal is not stable it is recommended to change the tacho mounting shift it relative to the shaft or horizon Setup vibration measurements amplitude and phase of vibration at the rotation frequency rotational speed Takemeasurement data of initial vibration in all measurement points prior to trial weight mounting Place the first trial weight Measure the vibration parameters at all the selected control points with the trial weight attached Proceed with calculations ofthe corrective weight Bythecalculated value ofefficiency inthis program t
22. her RMS Root Mean Square Peak or Peak to Peak Using the left right arrow keys select the units forrotation speed Hz RPM revolution per minute RPS revolution per second equals to Hz is set only to Auto during balancing measurements Youcanread more about this setting in the DC 12 manual phase measurements section This mode provides that the quality of tacho signal will be analyzed In the case of poore signal one of the following messages may be displayed at the bottom of the Vibration Measurement screen RPM is out of range itmeans thatthe currentmachinerotation speed isnot within the range of 60 through 100000 RPM Nosynchronization thereisnosignal fromthe tacho probe Thereason for it may be bad tacho probe placing or bad mark attached to the shaft or tacho is not connected to the DC 12 Recommendation is to change the tacho position or direction Unstablesynchronization thereis a random signal or signals per shat revolution MANUAL The modeallows to produce up to 2000 averages of the measured parameters Themeasurement process is interrupted manually with the lt Enter gt key AUTO The measurement quality and possible errors are analyzed automati cally duringmeasurements Then the following messagesare displayed depend ing on the results of the analysis Required accuracy wasobtained Whentheintendedmeasurementac curacy is achieved the measurement process will be automatically stopped 14 Angle Readin
23. is displayed EQUAL BALANCING PLANES 11 50 34 SELECT PLANE TO COMPUTE L1ST PLANE 2ND PLANE BOTH PLANES Make your choice Note thatusing both equal planes can reduce calculation accuracy and balancing efficiency Also itcan lead to mounting too big balancing weights Ifyou have selected one of the planes skip the measurement data at the last plane It allows you to work with three non equal planes To do so select Both Planes and press lt Enter gt Use the Previous button till you get to the Trial Weightscreen Mountthe trial weight at the next plane and continue to balance 24 Fig 3 10b Fig 3 11 Continue Balancing Test Measurement User s Manual VAST_BAL DC 12M Ifthe measurementis sufficient the Correction Weights screen is appears CORRECTION WEIGHTS 11 50 34 ESTIMATED VIBRATION m s 0 052 ANGLE READING DIR WITH ROTATION PLANE WEIGHT ANGLE GR DEG 1 075 182 NEXT This dialog presents the results of balancing weights calculations Using this data you must make a decision on whether you have to continue balancing or that the estimated result are sufficient for your machinery Here yousee the estimated maximum vibration level at all points if youmount the weights listed below in the specified planes Also displayed is the Angle reading direction you have selected in the Balancing Setup dialog Press theNextbutton and the Job Type screen will be p
24. layed to show all the data VIBRATION MEASUREMENT RESULTS 11 50 34 INITIAL VIBRATION PHASE DEG 1 POINT 1 AMPLITUDE m s 1 029 NEXT 20 Fig 3 5 Continue Balancing Balancing by Influence Coefficients Previous User s Manual VAST_BAL DC 12M This dialog displays the vibration parameters inall measurement points You can repeat vibration measurements atany point To do this use the arrow up down keys to select the measurement point and press the lt Enter gt key to go to the measurement screen for the selected measurement point The lt Cancel gt key brings you to the main menu and allows you to save data prior to it TheNextcommand displays the Balancing Mode Select screen BALANCING MODE SELECT 11 50 34 CONTINUE BALANCING BALANCING BY INFLUENCE COEFFICIENTS PREVIOUS This screen is for choosing a job to proceed Now you can decide whether to proceed through the full balancing cycle with trial runs or if you know the influence coefficients for this specific machine youcan proceed balancing by using influence coefficients withouttrial runs In the latter case you have to place the phase reference tacho and mark for it at the same place of the shaft as they were when you recorded the influence coefficients Use this command to proceed with balancing enter the parameters of trial weights and start trial runs Use this command to enter the infl
25. n this case the following message appears Required accuracy was obtained Tocheck signal quality after amanual break the signal variance is shown in per cent The commands atthe screen bottom can be selected by the left right up down arrow keys and provide the following operations 16 User s Manual VAST_BAL DC 12M Start Stop Thecommandtostart interrupt measurement process Previous Use this button to go to the previous screen Next Brings youto the next measurement screen or a screen to select a job Thescreen allows you to enter data with the keyboard To do so press the up arrow To navigate between fields use the up down arrows Then press lt Enter gt to set focus on theNextcommand 2 6 ATTACHMENT OF THE TRIAL AND CORRECTION WEIGHTS This section covers the common balancing problems that occurs during weight attachment Thereisalarge range of weight attachment types and they are not considered here The DC 12 balancing program provides two kind of placing trial weights with or without removing the previous one Thatis any trial weight can be removed or left in place Important Itis recommended to remove all trial weights before placing correction weights because the program computes them just for that case Ifthe trial weights cannot beremoved due to some inconveniences the value and mounting angle ofacorrection weightmust be calculated with regard to the trial weightremained in the given plane To do
26. ncluding trial runs withnew trial weights The reason for the later case may be the measurement errors or the dependance of the machinemechanical parameters on vibration magnitude The DC 12 balancing program features include balancing by known influence coefficients Ifinfluence coefficients of the machine under balancing are known forexample recorded during previous balancing cycle and themachine was not repaired considerably it can be balanced withouttrial runs Note also that the tacho mark should be on the same place Todothis selectthe Balancing by Known Influence Coefficients after the initial vibration measurements made Enter the influence coefficients for each plane and corrective weights will be calculated The detailed description of the balancing procedure with the DC 12 is presented below 8 User s Manual VAST_BAL DC 12M 2 2 HOW TO PREPARE THE DC 12 FOR BALANCING Anunpleasant surprise is if your instrument would automatically switch off during balancing The data obtained would be lost and the balancing cycle should be re started So youneed make some precautions Get to the DC 12 Main Menu Fig 2 1 DC 12 MAIN MENU 11 50 34 CHOOSE ROUTE OFF ROUTE LDATA TRANSFER UTILITIES APPLICATIONS Choose theUtilities command by the up down arrow keys and press lt Enter gt Fig 2 2 UTILITIES 11 50 34 SETTINGS DELETE ROUTE CALIBRATION ABOUT THE DC 12 SelectSe
27. r calculation you need to enter two parameters with the keypad enter the rough estimate of the rotor weightin kg enter the radius of the trial weight attachment points in mm i e the distance between rotor axis and weight mounting place Putin these data and press lt Enter gt In the Weight line the calculated value appears of trial weighting After that you can change your inputted data and repeat calculation Press the Next button and you will be back in the Trial Weight screen to proceed with balancing Note that to dothe more precise calculation of the trial weight you must follow therules below Ifthemachine foundationisrigid forexample by the anchor bolts then the calculated mass need to be magnified twice Ifthe machine is mounted onthe damping support then the calculatedmass is close to the optimum Ifyoubalancetherotor without the stator onthe balancing machine then the calculated mass need to be divided by two VAST BAL DC 12M 4 2 SPLIT WEIGHT Fig 4 3 Fig 4 4 User s Manual 37 Inpracticeitis not always possible to place the calculated balancing weight at the required angle In this case you need the operation called mass splitting The operation is to split the calculated mass in two parts which are placed in available locations Itis supposed that the mounting places are spaced regularly that is their mounting angle step and radius are the same You can go to this subprogram from the diffe
28. ram works under Windows 95 russian version english version To provide security the balancing software would be work only with the DC 12 of the given serial number Using the program with another DC 12 would be a frustrated experience Toload the software after youaddressed VAST Inc andreceived it just follow the instructions on the screen VAST BAL DC 12M User s Manual 41 APPENDIX 3 APPLICATION SOFTWARE TO LOAD AND STORE BALANCING REPORTS To provide unloading the reports from the DC 12 to the host computer their printing and storage you need the Rus 110 Application software The software works under Windows 95 To install it just follow the instruction appeared on the screen
29. rent screens One of them is the Job Type screen JOB TYPE 41250734 CONTINUE BALANCING TEST MEASUREMENT SUM WEIGHTS SPLIT WEIGHT PREVIOUS Choose the Split Weightcommand and press lt Enter gt The Split Weight screen appears SPLIT WEIGHT 11 50 34 WEIGHT GR 141 ANGLE DEG 45 NUMBER OF POSSIBLE ATTACHMENT PLACES 3 RESULTS OF WEIGHT SPLITTING WEIGHT MOUNTING ANGLE GR PLACE 100 1 100 2 90 NEXT Above is an example of the screen on the splitting mass of 141 g which is intended to be placed at angle of45 degrees The locations are spaced at 90 degrees The location ofthe firstweightis considered as the arbitrary zero for the mounting angle The program recommend to place two weights of 100 gat 0 and at 90 degrees 38 User s Manual VAST_BAL DC 12M 4 3 SUM WEIGHTS In practice there are often cases when several corrective weights are mounted at oneplane Thatis for example when one machine has been balanced several times To sum all such weights into one the Sum Weights subprogram is used In the DC 12 balancing program the weights are added by two To add more than two weights the action must be repeated You goto this subprogram from the Job Type screen Fig 4 5 JOB TYPE 11 50 34 CONTINUE BALANCING TEST MEASUREMENT SUM WEIGHTS SPLIT WEIGHT PREVIOUS Choose the Sum Weights command from this screen and press lt
30. resent JOB TYPE 11 50 34 CONTINUE BALANCING TEST MEASUREMENT SUM WEIGHTS SPLIT WEIGHTS PREVIOUS This screen enables you to select one of the following jobs You getto the Trial Weight screen to enter the next trial weight parameters and proceed withbalancing You getto the Weights Are Placed screen to take test measurement In this case youmust place the corrective weights which value must be more close to the calculated ones VAST BAL DC 12M Sum Weights Split Weights Fig 3 12 Fig 3 13 User s Manual 25 A support program enables you to sum several weights placed at the same plane See Section 4 3 A support program enables you to distribute the calculated mass among the candidate places at the given plane See Section 4 2 Selecting the Previous button you go to the previous screen Correction Weights Fig 3 10 Ifyou have chosenTest Measurement the Actual Weights Attached screen appears ACTUAL WEIGHTS ATTACHED 11 50 34 PLANE WEIGHT GR 0 000 PREVIOUS NEXT Inthis screen you have to enter with keyboard the actual parameters ofthe trial weights placed Weight and Angle which can differ from the calculated Using thePreviousbutton you may go tothe previous screen Job Type Fig 3 11 Press theNextbutton and the Vibration Measurement screen appears and the measurement process starts VIBRATION MEASUREMENT 11 50 34 TEST MEASUREMEN
31. rs for example when two disks at two different planes create a couple of forces that generate vibration The figure below shows an example of the dual plane unbalance Heavy spots VAST BAL DC 12M 1 5 THE METHOD OF BALANCING WEIGHTS User s Manual 5 ANALYSIS The DC 12 uses the method of influence coefficients to calculate balance weights The vibration response of the machine to the given trial weight are calculated for all measurement points first atthe first plane then atthe second and so on Thus the influence ofeach balance plane is taken into accountin all the measurement points Influence coefficients are calculated after the initial machine run withouttrial weights and trial runs with trial weights attached Ifthere is no big repair of the machine between balancing cycles itis possible to balancethemachine with onerunusing the influence coefficients computed during the previous balancing Itmay beavery efficient formultiplane balancing The influence coefficients are complex numbers and both real andimaginary parts of them shouldbe stored for each coefficient Onthe DC 12 s screen the influence coefficients are displayed in the balancing report While balancing by influence coefficients the operator has to enter the balancing coefficients for each plane in the same sequence otherwise the correction weight calculation will be wrong Note that while balancing by influence coefficients you MUST attach tacho in t
32. s used those settings are scipped VAST BAL DC 12M 2 5 VIBRATION MEASUREMENTS Fig 2 11 User s Manual 15 This is one of the general balancing screen It is used to measure amplitude and phase parameters at machine operating speed as well as the current rotation speed This is one of the general balancing screen Itis used to display the vibration measurement status During measurement the mean amplitude and phase values are displayed together with the currentrotation speed and the number ofaverages done Displayed are the balancing step for examle Initial Vibration and the number ofameasurement point VIBRATION MEASUREMENT 11 50 34 INITIAL VIBRATION MEASUREMENT POINT NOT MEASURED PREVIOUS START The current balancing stage is shown by indications Initial Vibration or Trial Weight N where N is the number ofa balance plane or Test Measurement N where N isthe number of atest measurement as well as the measurement poit number The measurement parameters are represented by magnitude and phase and running speed values The number of averages obtained is also shown The automatic analysis ofthe input signal parameters is performed during the measurement In the case of deviation from the required quality of the signal from the tachometer or the vibration transducer the message appears By default the measurement is stopped automatically as soon as the required accuracy of the readings is achieved I
33. the DC 12 Inbalancing you will be back to the screen where you have pressed theCancel button Save Status Thecommandallows youto save balancing data and go back to your previous screen You may use the command to back up your data Cancel Youwillbeback tothe previous screen After you saves the balancing data using the lt Power gt or lt Cancel gt key andrun the balancing program Application Menu Balancing once again the screen is displayed as follows Fig 2 7 BALANCING STARTUP MODE 11 50 34 PREVIOUS BALANCING CYCLE WAS INTERRUPTED CONTINUE BALANCING NEW BALANCING The screen allows youto make your choice between the following Continuebalancing Thecommandto go back tothe previous screen New balancing By the command you will be prompted to set up the new balancing cycle 12 User s Manual VAST_BAL DC 12M 2 4 BALANCING SETUP OVERVIEW To setup the DC 12 for balancing select the Application command from the main menu of DC 12 To doit usethe up down arrow keysand press lt Enter gt Then selectBalancingfrom the Application menu Fig 2 9 APPLICATIONS MENU 11 50 34 MESSAGES LTACHO MONITOR BALANCING BALANCING LOGS VECTOR CALCULATOR REMOTE CONTROL Since you pressed lt Enter gt the Balancing Setup screen appears Fig 2 10 BALANCING SETUP 11 50 34 MACHINE ID NUMBER OF MEASUREMENT POINTS 1 AMPLITUDE UNITS m s DETECTOR PEAK ROTATION SPEED Hz
34. ttingson the screen and press lt Enter gt The next screen appears VAST BAL DC OM User s Manual 9 Fig 2 3 SETTINGS 11750734 TIME DATE RS 232 SETUP POWER SUPPLY DISPLAY AND KEYBOARD MEASUREMENT MODES TRANSDUCER Choose Power Management and press lt Enter gt to display the Power Managementscreen Fig 2 4 POWER MANAGEMENT 11 50 34 AUTO SHUT DOWN min 20 AMPLIFIERS SWITCH OFF CON BATTERY CAPACITY 56 mi CHARGED BATTERY CAPACITY OPERATING TIME CHANGE ACCESS RIGHTS SetAuto Shut Down to Noby the right left arrow buttons In this mode the instrument shouldbe switch off only manually To doso usethe lt Power gt key It displays the menu for saving your data as itis described inthe next section 10 2 3 SAVING YOUR DATA Note Fig 2 5 Save Status amp Switch off Switch off Save Status Cancel User s Manual VAST_BAL DC 12M From above itis apparent that it is important to save your data in thenonvolatile memory during balancing with DC 12 The softwareprovides you with choices after pressing either the lt Power gt or lt Cancel gt keys These keys are used to power down or go to the Main Menu but preliminarily you may save your data Pressing the lt Power gt key during balancing displays the Shut Down screen If you hold down the lt Power gt key more longer you cause the device to switch off and any balancing information will be lost
35. uence coefficients for this machine and calculate correction weights without trial runs See section 3 4 This command is used to revert to the previous window Initial vibration measurementresults Ifyou selected theContinue Balancingcommand the Trial Weight screenis displayed VAST BAL DC 12M Fig 3 6 Attachment Type Angle Reading Dir Weight Angle Trial Weight Estimation Sum Weights Split Weight User s Manual 21 TRIAL WEIGHT 11 50 34 TRIAL WEIGHT 1 ATTACHMENT TYPE TEMPORARY ANGLE READING DIR WITH ROTATION WEIGHT GR 0 000 ANGLE DEG L 0 NEXT TRIAL WEIGHT ESTIMATION SUM WEIGHTS SPLIT WEIGHT PREVIOUS Youhavetostopthe machine and place the trial weight This dialog box allows you to enter the parameters of trial weights to be mounted in the selected plane Using the keypad enter the following weight parameters select whether the current trial weight will beremoved or left in place prior to the nexttrial weight attachment Itis recommended to remove the previous trial weight The direction you have selected is shown forreference canbemeasured in grams as wellas in any other unit e g volume length ifyou userods The important factor is touse the same units during a balancing cycle enter the angle of the trial weight mounting in degrees relative to the zero mark Itisrecommended to use the trial weight mounting pointas areference To do so enter
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