SFB-907 Field Balancer - Spectrum Instruments Ltd.
Contents
1. Manual of SPECTRUM 907 Field Balancer www spectrum instruments com to Balance Input 2 with the number key to indicate that 2 plane balancing is to be performed And then the cursor goes to the 4 line automatically Line 4 select type of input There are 2 types of input modes altogether SEN and VOL When the cursor is on the 4 line the note displays Enter to Select Due to all data of the previous data will be cleared when the input mode is changed the following warning will be shown in the 11 and 12 line ARE YOU SURE ENTER YES OTHER NO That is to say each time the input mode is altered ENTER must be pressed 2 times If press any key except ENTER no operation is performed Line 5 select measuring mode There are 3 types of measuring mode altogether VEL DIS ACC When the cursor is on the 5 line the note displays Enter to Select Due to all data of the previous data will cleared when the measuring mode is changed the following will be shown in the 11 and 12 line ARE YOU SURE ENTER YES OTHER NO If press any key except ENTER no operation is performed If the alteration is really needed press ENTER the measuring mode will be altered Line 6 input sensitivity of sensor A The manufacturer usually offers the sensitivity After the 5 including dot digit is input the cursor goes to the 7 line automatically If the length of the data input is less then 5 press ENTER or after the input and then the c2. attery Charge so Communic ation 4 Spee N yerme i Zee A Port Foy 3 y gt igetebeck recom Trasta 3 Nr E tache senting channel Revision D Page 3 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com Features Easy to use Vector illustration the balancing process and result are shown clearly at a glance Storage of 10 rotors balancing data User selectable trial mass Split weight calculation Trial weight range calculated according to the weight of rotor rotation speed radius and required balance grade Trial mass validity judged automatically Measuring RPM amplitude and phase On site 400 lines FFT spectrum and diagnosis function Dual channel simultaneous data collection Hardware envelop demodulation for bearing and gear diagnosis Transfer function for measuring natural frequency Waveform and spectrum display by large LCD Storage of vibration values and vibration waveform Operation condition Temperature range from 5 C to 50 C Relative humidity lt 85 unsaturated Without caustic gases Without strong electric magnetic field amp strong impact Safety The SFB 907 should not be permitted to make contact with any running part of machine Specifications Rotation speed range for dynamic balancing 180 24 000 r min Auto range and manual range selectable Measurement accuracy E Noise Level without vibration input ACC lt 0 25
3. 5 press ENTER or after the input and then you go to the next line Line 7 Input sensitivity of sensor B When 1 plane balancing is performed this parameter is not needed Revision D Page 10 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com Line 8 Input the weight of a trial unit This is useful if some fixed weight unit is used during the balancing Line 9 Tell whether the influence coefficients are known ENTER to Select Press ENTER repeatedly YES and NO is shown circularly NO indicates the coefficients are not known Line 10 ENTER to Clear All Data of the Rotor Press ENTER the following is shown on the 11 and 12 line ARE YOU SURE ENTER YES OTHER NO If press ENTER the measured data will be cleared the balance grade and the sensor sensitivities will change to default values Press any key except ENTER no data are cleared Before a balancing operation is performed each line of this page must be rightly configured You may skip a line by press or J Press Pg Dn to go to the next page Step 2 Initial measurement we ue following page y opened the ae is INITIAL MEASUREMENT on the 2 line Speed r min is shown on the right MEASURE speed r min side of MEASURE If you hope to see some ROTATION SPEED 4830 measurement move the cursor to there and then the Aa 4 645 um Pa 120 value is displayed You can also edit the value When Ab um Pb the cursor is on t
4. Point b 2 014 mm s Unit 243 If one or both of the data on the 2 and 4 line less than 25 NO is shown on the 6 line indicating that the trial II is not suitable If the phase change is less than 25 while the amplitude change is more than 25 the note displays Trial II should be moved If the changes Revision D Page 20 of 33 NOTE Manual of SPECTRUM 907 Field Balancer www spectrum instruments com of both phase and amplitude are less than 25 the note displays Change Location or Increase its Weight Increasing weight should be considered firstly After adjust the trial mass II according to the note suggest restart the machine and repeat the trial A measurement till satisfying result obtained Step 5 calculate influence coefficients and balancing mass Influence coefficients are calculated firstly BALANCING MASS On the 2 line press ENTER to calculate the CALCULATE 3 I 0 030Unit 258 influence coefficients Press Pg Dn to next page Il 0 020Unit 174 And then balancing mass is calculated When the page is opened all the places showing values are vacant If you hope to see certain value move the cursor to where it lies The values are also editable Press ENTER on the 2 line the balancing mass is calculated and shown NOTE If the cursor is moved down without calculation to the 3 and 4 line you may input weight and phase for following calculation like Pa
5. can be fully charged within about 6 hours The battery could run for about 8 hours continuously if they are fully charged Maintenance The SFB 907 is warranted for 3 years except battery sensors and cables The warrant of piezoelectric accelerometer is 1 year the balance is 30 days Calibration The SFB 907 sensors should have their calibration checked annually Service If something goes wrong please record the fault symptom and communicate same to Spectrum Instruments Ltd at 1 800 778 3428 or info spectrum instruments com APPENDIX Revision D Page 31 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com BALANCE GRADE OF RIGID ROTORS Abstracted from ISO 1940 1 1986 Requirement of balance grade of rigid rotors machine vibration Bal eh G Examples of the rotor type E mm s G4000 4000 Rigidly fixed crooked axis transmission set of low RPM diesel engine with odd amount of gases specially used for ship G1600 1600 Rigidly fixed crooked axis transmission set of great 2 stroke engine G630 Rigidly fixed crooked axis transmission set of great 4 stroke engine Flexibly fixed crooked axis transmission set of diesel engine specially used for ship 250 Rigidly fixed crooked axis transmission set of high RPM 4 gas diesel engine 100 Crooked axis transmission set of high RPM diesel engine with 6 or more gases The whole engine of a truck or an auto diesel or gas engine Wheels flange transmis
6. cursor to other places directly When the cursor is at the place showing amplitude in the 4 line the note displays Input Amplitude ENTER After the including dot digit is input or pressing ENTER or the cursor goes to the place showing phase The note displays Input Phase ENTER The 5 line is unreachable CALCULATE Press Pg Dn to the next page after the Plane I to Point a 1 235 mm s Unit 174 measurement or input Plane I to Point b Step 3 input influence coefficients mmis Unit Plane II to Point a When the page is opened the cursor is on the Unit 2 4 line All the places showing value are vacant Piane I to Denke Move the cursor down to the place showing mmsliit amplitude in the 4 line The note displays input amplitude ENTER You may use the storage value NOTE or input a new one After the input the cursor goes to l i pre as BALANCING MASS the place showing phase and note displays input CALCULATE phase ENTERS 1 0 030Unit 258 Press Pg Dn to the next page II Unit Step 4 calculate Balancing mass is calculated here When the page Revision D Page 15 of 33 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com is opened the cursor is on the 2 line The note displays ENTER to Calculate All the places showing values are vacant You may move the cursor to a place then the previous value is displayed The value is also editable Pre
7. except line 9 is the same as Revision D Page 14 of 33 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com that without influence coefficients Line 9 confirm whether the influence coefficients are known When the cursor is on the 9 line the note displays ENTER to Select Press ENTER repeatedly YES and NO is shown circularly Here YES is selected to indicate the coefficients are known Step 2 Initial measurement When the cursor is on the 2 line speed r min is shown on the right of MEASURE all the places showing value are vacant if you want to see some previously measured value move the cursor to where it lies and then it is displayed The value is also capable of being edited say manually input When the cursor is on the 2 line press ENTER the 907 begins measuring the rotation speed The data on the right of the 3 line is updated continually Now vibration is shown on the right of MEASURE When the rotation speed becomes stable press ENTER for a moment the 907 begins measuring vibration The data in the 4 line the lest is amplitude the right is phase are updated continually Stop meas is shown on the 2 line When the rotation speed amplitude and phase all become stable press ENTER for a moment to finish the measurement Next step is shown on the right of MEASURE If the cursor is moved down without measurement a note displays Incapable of input SKIP IT will be on the 3 line Move the
8. left is amplitude while right is Pb CHANGE o phase are updated continually Stop meas is Ab CHANGE A shown on the right of MEASURE When the TRIAL I VALID YES rotation speed amplitude and phase all become stable press ENTER for a moment to finish If the cursor is moved down without measurement to the 6 line the note displays Incapable of input SKIP IT Move the cursor to other places directly When the cursor is at the place showing CALCULATE amplitude in the 7 line the note displays Input Plane toPointa Amplitude ENTER and then Input Phase 1 235 mrm s Unit 174 ENTER Plane I to Point b The 8 line is unreachable mm s Unit Plane II to Point a mm s Unit Revision D Page 12 of 33 Plane II to Point b mm s Unit Manual of SPECTRUM 907 Field Balancer www spectrum instruments com Press Pg Dn to the next page to display the result of trial I measurement The line shows how much the phase changes the 3 line displays how much the amplitude changes If the data shown on the 2 line is larger than 25 0 YES is shown on the 6 line indicating that the trial is valid the note displays Trial I is Feasible you may press Pg Dn to the next page Otherwise NO is shown on the 6 indicating that the trial is not suitable If the change of phase is less than 25 0 while the change of amplitude is more than 25 0 the note displays Trial I should be moved If the changes of both phase and amplitu
9. the a 4 645 um Pa 120 cursor is on the 2 line press ENTER to measure Ab 6 123 um Pb 135 rotation speed The data on the 3 line is updated continually Now vibration is shown on the right of MEASURE When the rotation speed becomes stable press ENTER for a moment the SFB 907 begins measuring vibration The data in the 4 and the 5 NOTE line the left is amplitude the right is phase are updated continually Stop meas is shown on the right of MEASURE When the rotation speed amplitude and phase all become steady press ENTER for a moment the measurement is finished Next step is shown on the right of MEASURE again If the cursor is moved down without measurement to the 3 line the note displays Incapable of input SKIP IT When the cursor is at the place showing amplitude in the 4 line the note displays Input Amplitude ENTER After the a including dot digit is input or press ENTER or 4 the cursor goes to the place showing phase in the 4 line After the 3 including dot digit is input or press ENTER or 4 the cursor goes to the place showing amplitude in the 5 line When the cursor is in the 5 line you may input too the amplitude and phase manually for the second point measurement Press Pg Dn to the next page after the input or measurement Step 3 Estimate trial mass and measure the vibration Firstly calculate the weight range of trial mass TRIAL ESTIMATION according to th
10. 0Hz 10000Hz and 6 options for dual channel 100Hz 200Hz 500Hz 1000Hz 2000Hz 5000Hz Use lt or gt to select a suitable one Sen ScaleA is the accelerometer sensitivity of channel A while Sen ScaleB is that of channel B Press or to move the cursor to the place then press Enter Then input by number keys Press Enter to confirm Format Memory All waveforms will be cleared and all parameters will be reset to the defaults SFG 907 will name all points with natural sequence The sensitivity of sensor and the alarm multiple factor will be reset to the default value 5 00 and 3 00 The screen will return to the menu of Collector The last line is Auto Range or Man R Manual Range Man R means you may manually control the measurement range for single and dual channel measurement This is especially useful when you need to measure an unstable signal The method of operation is as the following Firstly press lt or to choose between Auto Range and Man R When the display is It means that channel A signal may be amplified 10 times while channel B amplified 20 times If you Revision D Page 28 of 33 Name POHE Channel Mode SINGLE Input Mode SEN Wave Mode DISP Tng Mode NO Freq Range 1000 Hz sen scaleA 5 00 sen ocaleB 5 00 Format Memory Auto Range 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com press Enter there is no number in the cursor then press number
11. 3 CHAPTER 2 BALANCE PRINCIPLES boc ssscscnsesassaesseseescenssaecescnttessesbencedecisesedcacesn 4 CHAPTER 3 BALANCING PREPARATION cccccccccccccccccccccesceccecscceccecees so 7 CHAPTER 4 BALANCING OPERATIONG ccccccccccccccccccccccccsccscescescesseees 8 L plane balancing carane iinr ion couaieas AEE E N evagedions 8 Without influence Coefficients eisir A EOSO 8 With milu nce COST CIENTS 6 3 i sas eiin en EE E O O 13 2 planes balancinp sierot RE E T E E A 15 Without mfl ence coefficichtSecs rones rinna e EE E EE E 15 With intluence COSiMClENtS x 05 onien e a E E EEAO 21 APPENDIX BALANCE GRADE OF RIGID ROTORS ceccsscssescnscssescoees 31 Revision D Page 2 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com 1 GENERAL Imbalance is one of the main causes of machine vibration It is estimated that about 50 percent of all the faults are caused by imbalance of rotors The best mean for getting rid of mechanical imbalance is on site balancing Spectrum s SFB 907 Field Balancer is especially useful for this purpose It can measure the intensity of the vibration and diagnose vibration cause by analyzing the frequency spectrum It can also be used to measure the rotation speed and vibration phase and to calculate the imbalance weight and location Acc elerorreter Channel B AT AY asi s f J k Colector wrheas ws Spaer Keyboard _Kertoara X M N Af
12. BREAK UP TO Pal 120 2 369 Unit decomposition Pa2 270 2 000 Unit Step 5 discompose vector Pb BREAK UP TO Fbl 180 1 236 Unit If the discomposing is not needed press Pg o a Dn to skip this page directly Brae A V Paai Yni After the page is opened the vector of balancing mass is just ends on the circle The 3 and the 4 line are relative to the vector graph on the left while the 6 and 7 line are relative to the graph on the right Method of discomposing is the same as in plane balancing so is omitted here MEASURE speed r min ROTATION SPEED 3660 Step 6 Verification Aa 4 645 um Pa 250 Ab 6 123 um Pb 120 a 90 CHANGED b 90 CHANGED When the page is opened the cursor is on the le line all the places showing values are vacant Press ENTER let the SFB 907 measure rotation speed When the rotation speed becomes stable press ENTER for a moment the SFB 907 begins measuring vibration When the rotation speed amplitude and phase all become steady press NOTE ENTER for a moment the measurement is finished The 3 line displays rotation speed the 4 line displays vibration values of point A the 5 line displays vibration values of the point B The 6 line display how much the vibration of point A has changed The 7 line display how much the vibration of point B has changed If the Revision D Page 21 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum inst
13. ER to select from REMOVE and REMAIN On the 5 line press ENTER to measure rotation speed When the rotation speed becomes stable press ENTER for a moment the 907 begins measuring vibration When the rotation speed amplitude and phase in the 7 and the 8 line all become steady press ENTER for a moment to finish the measurement In next page the 2 and 3 line display the change of vibration phase and amplitude of point A before and after the fixing of trial mass I The 4 and 5 line display the change of vibration phase and amplitude of point B before and after the fixing TRIAL I RESULT of trial mass I If the data shown on the 2 and Pa CHANGE 300 the 4 line are both larger than 25 0 YES is Aa CHANGE 30 0 shown on the 6 line indicating that the trial Lis Pb CHANGE 90 valid the note displays Trial I is Feasible Ab CHANGE 50 0 Stop the machine and fix another trial mass TRIAL I VALID YES on plane II Whether the first trial mass is removed or not is determined by the setting of the last page Restart the machine and go to the next page If one or both of the data on the 2 and 4 NOTE line less than 25 NO is shown on the 6 line indicating that the trial I is not suitable If the phase change is less than 25 while the amplitude change is more than 25 the note displays Trial I should be moved If the changes of both phase and amplitude are less than 25 the not
14. IBRATION ANALYZER DATA COLLECTOR NOTE THAT SOME OF THE FEATURES LISTED BELOW MAY NOT BE AVAILABLE IN YOUR INSTRUMENT CONTACT SPECTRUM REGARDING FUTURE PLANS TO ADD NEW FEATURES The SFB 907 is also a user friendly instrument capable of recording and analyzing vibration information In the Free Shot mode you can measure ENVE ACC VEL and DIS The sensor connected in the Accelerometer socket or VOL The sensor connected in the Voltage socket and display new measured and old data comparatively In the Ext Trig mode SFB 907 must have a trigger impulse signal connected in the Trigger RPM socket and the vibration signal is recorded only when the trigger impulse signal appears Different from the Free shot user can get position related information Furthermore you can measure rotate speed and balance a rotor The SFB 907 keyboard has 20 buttons Among them Collector C Spectrum Revision D Page 22 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com Notebook W Meas W spectrum W Save Zoom W Recall Transfer Tacho Setup Channel are the buttons for data collector analyzer Enter 1 T lt gt are auxiliary buttons The button at right side of SFB 907 is used for switch between the functions of balancing and collector analyzer Notice 1 If the device is not used for minutes it will power off automatically When the device is in the mode of measuring rotation speed it
15. PLES 2 1 What is 1 plane rotor imbalance Rigid rotor works under the speed far less than its first order critical rotate speed and its deformation can be neglected When the quality of the rigid rotor nearly focuses on a disc namely the ratio of its axial length and its diameter is less than 0 5 we can do 1 plane balance on it and gain satisfactory results But for the flexible rotor the deformation cannot be neglected So its method of balance differs from rigid rotor However the rotor with single imbalance plane can also be balanced according to the method of 1 plane balance of rigid rotor For above whether the rigid or flexible rotor its quality of imbalance always focuses on one disc so both of them can be balanced according to the method of 1 plane rotor balance In plant and manufacturing environments such rotating machines are ubiquitous such as pump ventilator etc 2 2 Principle of 1 Plane Balancing The SFB 907 s 1 plane balance adopts the method of influence coefficient which is also called balance method of 1 plane phase measuring Just as its name implies it s desirous to do the measurement with the phase of rotation speed vibration when measuring the vibration amplitude of rotor The rotation speed vibration can be indicated as a vector The process of 1 plane balance is as follows 1 Measure and gain the initial rotation speed vibration vector AQ under the normal operation condition 2 Load the proper trial m
16. SFB 907 For 1 plane balancing 1 vibration sensor should be connected to the Accelerometer Channel A or Voltage Channel A socket For 2 plane balancing a second accelerometer should be connected to the Accelerometer Channel B or Voltage Channel B socket lt 4 gt Start Machine Start the machine and wait till it reaches its normal rotation speed can be measured with the RPM measurement function NOTICE 1 Because of the strong pull force of the magnetic mount when removing the sensor from the measurement surface use your hand carefully Do not remove the sensor by dragging the cables 2 Before measurement the sensitivity of the sensors must be inputted to the SFB 907 correctly 3 The internal external trigger switch should be set to external Revision D Page 9 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com 4 BALANCING OPERATIONS 4 1 1 Plane Balancing 4 1 1 WITHOUT INFLUENCE COEFFICIENT Step 1 Setting Parameters ROTOR NUMBER 1 Press POWER ON on the panel fora moment SETTING without any operation the 1 page appears Then NUMBER OF PLANE 1 you can set the parameters INPUT MODE Vel MEAS MODE Dis SEN a 5 000pC ms SEN b 5 000pC ms WEIGHT UNIT 11 22 g HAVE INFL COEF NO CLEAR DATA Line 1 Input rotor number When the cursor is on the 1 line the note displays Which Rotor to Balance Input rotor number with a number k
17. SPECTRUM INSTRUMENTS LTD USER S MANUAL For the SFB 907 Field Balancer A Portable Dual Channel Microprocessor Based On site Balancer E mail info spectrum instruments com Fax 1 866 782 0106 Telephone 1 800 778 3428 1 613 439 8767 Address 44 Forest Drive Brighton ON Canada Postcode KOK 1HO http www spectrum instruments com Revision E 2011 03 03 SFB 907 USER S MANUAL Manual of SPECTRUM 907 Field Balancer www spectrum instruments com The information contained in this document is proprietary No part of this manual may be reproduced or transmitted in any form or by any means without the permission of Spectrum Instruments Ltd and or its supplier The information provided in this Manual is believed to be reliable However Spectrum Instruments assumes no responsibility for inaccuracies or omissions Spectrum Instruments assumes no responsibility for the use of this information and all use of such information shall be entirely at the user s own risk Specifications are subject to change without notice No patent rights or licences to any of the functions described are implied or granted to any third party Spectrum does not authorise or warrant any Spectrum product for use in life support devices or systems Revision D Page 1 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com CONTENTS CHAPTER 1 GENERAL sessiserisissririnsoprinsokissist isto Ked Kusa SNES NISN OONN
18. ace behind Note select it by Hor D Revision D Page 27 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer 4 Set Parameter For Analysis Press Setting key to set up all parameters for signal analysis The display is like the right figure The first line shows the present point name which is determined by the Collector menu Channel mode has two options of SINGLE and DUAL i e single channel and dual channel You may select it by or gt key Input mode has two options SEN and VOL i e sensor mode and voltage mode Select it by or gt key www spectrum instruments com Name POHE Channel Mode SINGLE Input Mode SEN Wave Mode DISP Tng Mode NO Freq Range 1000 Hz sen scaleA 5 00 sen ocaleB 5 00 Format Memory Auto Range When the input mode is SEN Wave Mode has four options i e ACC acceleration VEL velocity DIS distance and ENVE high frequency acceleration envelope If input mode is VOLT the wave mode can only be VOLT Trigger mode has two options of Yes having trigger and No free sampling When Yes is chosen you must really have trigger signal Otherwise the instrument will always wait for triggering before collecting until you power off it Notice Switch the Inner External Trigger Switch to External if you are using a tacho sensor Freq Range has 7 options for single channel 100Hz 200Hz 500Hz 1000Hz 2000Hz 500
19. and vibration sensor start the machine select 907 s 2 plane balancing function measure vibration values of the 2 points with influence coefficients no influence coefficients halt the machine mount a trial mass on the first plane and then restart the machine input the weight and angle of the trial mass on the first plane measure vibration values of the 2 points input coefficients halt the machine unload the trial mass on the first plane and fix another on the second plane then restart the machine input the weight and angle of the trial mass on the second plane measure the vibration values of the 2 points output the result of calculated balancing mass output the result of calculated balancing mass and four influence coefficients halt machine install balancing mass according to the result presented by the device restart the machine and measure the vibration values of the 2 points the vibration should decrease evidently usually the reslut is less than 20 percent of the initial vibration if the result is not satisfying try again the influence coefficients could be borrowed from the last measurement repeat till the result is satisfying 2 Plane Balancing Revision D Page 8 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com 3 BALANCING PREPARATION Before using the SFB 907 for balancing the following must be done firstly lt 1 gt Confirm Dynamic Balance Needed A
20. ass M on the rotor and then measure vibration vector A01 under the condition of the same rotate speed 3 Calculate the balance mass Q which should be load on the rotor according to the following formula Q M x A0 A01 AO During the balancing all the vibration should be measured under the same rotate speed because of the imbalance force of rotor relates with the rotate speed 2 3 Principle of 2 planes balancing Almost all the balancing of single span rotors can be achieved through the method of 2 planes dynamic balance As a matter of fact 1 plane dynamic balance is only one special example of 2 planes dynamic balance When doing 2 planes dynamic balance two planes of adding mass and two points of vibration measure are needed The SFB 907 s 2 planes dynamic balance also adopts the method of influence coefficient But the difference from 1 plane dynamic balance is that the vibration of two measurement points should be measured when Revision D Page 5 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com adding trial mass to one of the planes That s so called interact effect 2 planes dynamic balance has four influence coefficients The steps to do 2 plane dynamic balancing is as followings 1 Measure initial value of two measurement points 2 Load trial mass to first plane then measure the vibration of two measurement points respectively Load trial mass to second plane and then measure
21. de are less than 25 0 the note displays Change Location or Increase its Weight Under these two conditions NO is shown on the 6 line Press Pg Up to the last page stop the machine adjust the trial mass accordingly to the note Repeat the trial I measurement Step 4 calculate influence coefficients and balancing mass Influence coefficients are calculated firstly When the page is opened the cursor is on the 2 line BALANCING MASS The note displays ENTER to Calculate all the CALCULATE places showing values are vacant Press ENTER the I 0 030Unit 258 influence coefficients are calculated and shown in II Unit the 4 line Press Pg Dn to next page and then balancing mass is calculated In the next page the cursor is on the 2 line The note displays ENTER to Calculate All the places showing values are vacant Move the cursor to display the original measured value The value may also be edited Press ENTER the balancing mass is NOTE calculated and shown in the 3 line The location of balancing mass is also shown with vector chart You may input manually the balancing result without calculation When the cursor is at the place showing weight in the 3 line the note displays Input Weight ENTER and then Input Phase ENTER The 4 line is unreachable Press Pg Dn to the next page after the calculation or input Step 5 discompose vector If discomposing is not required press Pg D
22. e Speed r min is Aa 4 645 um Pa 250 shown at the right of MEASURE Press ENTER the Ab umi Ph SFB 907 begins measuring rotation speed while a 90 CHANGED Vibration is shown at the right side of MEASURE in 4 CHANGED the 2 line When the rotation speed becomes stable press ENTER for a moment and then the SFB 907 NOTE Step 6 Verification o will begin measuring vibration Stop meas is shown at the right of MEASURE in the 2 line When rotation speed amplitude and phase all become stable press ENTER for a moment to finish the measurement Next P is shown i the right of MEAS MODE Dis MEASURE in the 2 line The 3 line displays SEN a 5 000 pC ms rotation speed the 4 line displays vibration vector SEN b 5 000 pC ms ROTOR NUMBER 1 NUMBER OF PLANE 1 INPUT MODE Vel of point I The 6 line displays how much the WEIGHT UNIT 11 22 g vibration of point I has changed The user could see HAVE INFL COEF YES whether the result is usable If the result is not CLEAR DATA acceptable repeat the operation The influence coefficients could be borrowed from the last NOTE measurement 4 1 2 WITH INFLUENCE COEFFICIENTS INITIAL MEASUREMENT MEASURE speed r min ROTATION SPEED 4830 Press POWER ON on the panel for a moment Aa 4 645 um Pa 120 without any operation the 1 page is opened Now it Ab um Pb is time to set parameters Step 1 Setting Parameters The operation of lines
23. e displays Change Location or Increase its Weight Increasing weight should be considered firstly After adjust the trial mass I according to the note suggest restart the machine and repeat the trial A measurement till satisfying result obtained TRIAL I MEASUREMENT TRIAL LOCATION 60 TRIAL WEIGHT 3 000 U Step 4 fix a trial mass on plane II and measure the AFTER MEAS REMOVE vibration MEASURE speed r min In this page the places on the 6 8 lines ROTATION SPEED 8765 showing values are vacant If you hope to see the Aa 4 645 um Pa 120 Ab 6 123 um Pb 135 Revision D Page 19 of 33 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com previous value move the cursor to where it lies and then they are displayed These values are also editable When the cursor is on the 2 line input the angle at which the trial locates Notice that the angle input should be between 0 360 In the 3 line input how many weight unit used for trial II The 4 line requires you to determine whether trial mass should be removed later Press ENTER to select from REMOVE and REMAIN When the cursor is on the 5 line the note displays Enter to Measure Speed r min is shown on the right of MEASURE at first Press ENTER the SFB 907 begins measuring rotation speed The data on the right of the 6 line is updated continually Now vibration is shown on the right of MEASURE When the rotation speed becomes s
24. e formula recommended by ISO WEIGHT OF ROTOR 3 000 kg When the page is opened the cursor is on the MAXIMAL RPM 6000 2 line ask you to input the weight of the rotor TRIAL RADIUS 25 00 mm The 3 line ask you to input maximal rotation BALANCE GRADE 1 000 CALCULATE speed with the number keys POR TRIAL MASS RANGE The 4 line ask you to input the maximal FROM 1 243 g TO 2 486 g radius at which the trial masses are fixed The 5 line ask you to input required balance NOTE grade according to ISO1940 When the cursor is on the 6 line press Enter the weight range of trial mass is displayed in the 8 line Stop the machine fix a trial mass on plane I according to the weight range estimation and then restart the machine When the rotational speed becomes steady Revision D Page 18 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com press Pg Dn to the next page In the Trial I Measurement page the places in the 7 9 showing values line are vacant If you hope to see the previous value move the cursor to where it lies and then the original value is displayed These values are also editable When the cursor is on the 2 line input the angle at which the trial locates Notice that the angle should be between 0 360 In the 3 line input how many weight unit used for trial I The 4 line requires you to determine whether trial mass should be removed later Press ENT
25. e value of alarm factor and then press Enter to confirm 1 6 The display of overall vibration value The measured vibration values are at the lower part in the screen When accelerometer is used the Alm mode is among Acc acceleration Vel velocity Dis distance and HFA high frequency acceleration Press Enter to begin measuring the display of vibration value in the screen is as the following a oo H po T m 5 NEW data OLD data When the Alm mode is Vol voltage press Enter to begin measuring The measurement result is shown in the screen as the following Revision D Page 25 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com NEW data OLD data VOL Vp VOL VOL When the memory has just formatted and no measurement has been taken the data under New data will be empty The column Old data will include the values that the computer has transferred or the values have measured before the memory is formatted After a measurement is finished the column new data displays the new measured values Notice The comparison of new and old data is valid only when a new measurement has been taken and you have not changed the point name to another 1 7 Measurement Firstly fix the accelerometer to measurement location and connect the cable well After power on the 904 confirm that all parameters are properly set Then press Enter to measure Now the alar
26. every parameter is correctly set and if the sensors are fixed correctly 6 After setting parameter the measurement must be performed immediately Otherwise the parameter you set may be lost Screen of Data collecting The functions of data collecting menu include Revision D Page 23 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com Setting parameters for alarming and waveform saving Measuring vibration and displaying the results Showing the state of measurement with NEW OLD flag Calculating the frequency spectrums automatically Before use 904 to collect data you should set parameter as following 1 1 Find the sequence number and measuring point The sequence number is after the memory is formatted and it is displayed on the top left of the screen The range of sequence number is from 1 to 240 The digits behind the sequence number are the name of measuring point After the memory is formatted the names of measuring points is PO Each name of measuring point is made up of 16 digits You may use computer software MCMe to set the measuring point name You may manually move the cursor to name of measuring point and use or to change it 1 2 Set alarm mode The purpose of the Alm mode in the second line is E To decide which parameter to be used for raising the alarm E To decide which parameter to be used for spectrum calculating E To save 100 line spec
27. ey The range of rotor number is from 0 to 9 After the input the cursor goes to the 3 line automatically Press or 4 key to move the cursor between lines the following are the same NOTF Line 2 Title the cursor cannot arrive Line 3 Type of operation How Many Plane to Balance Input 1 with the number key indicating that 1 plane balancing is to be performed and then the cursor go to the 4 line automatically Line 4 Type of input SEN for charge output accelerometer and VOL for any voltage input Enter to Select Due to all data of the previous data will cleared when the input changed the following warning will show in the 11 and 12 line ARE YOU SURE ENTER YES OTHER NO If press any key except ENTER no operation is performed If press ENTER the input mode will be altered The displayed is the selected Line 5 Measuring mode There are 3 options VEL DIS ACC Enter to Select Due to all previous measured data will be cleared when the measuring mode is changed the following warning will show in the 11 and 12 line ARE YOU SURE ENTER YES OTHER NO If press any key except ENTER no operation is performed If press ENTER the measuring mode will be altered Line 6 Input sensitivity of sensor A The sensitivity can be usually obtained from the sensor certificate After the 5 including dot digit is inputted the cursor goes to the 7 line automatically If the length of the data input is less than
28. ffirm that machine has fault of imbalance and that it can be eliminated by the method of balancing Once the machine has heavy vibration we should do frequency analysis with the vibration signals firstly Generally the probability of imbalance is higher So when the vibration includes a high rotation frequency spectrum peak and less harmonic frequency peak meantime without evidence of other faults very possible it is the fault of imbalance lt 2 gt Mount Sensors Vibration Sensors It should be attached in the horizontal direction or vertical if horizontal not possible on the bearing base or on the base frame Because dynamic balancing is vector calculus the position and direction of the sensor should keep unchanged in the balancing process Photoelectric sensors Paste a reflecting or unreflecting adhesive paper according to the condition of the rotor s surface to a visible place of the rotor or its axis Photoelectric sensor can give the SFB 907 one electric pulse per turn of the running rotor Not only the rotational speed can be measured but also the vibration signals can be compared with pulse signals So the phase of the rotation frequency vibration can be obtained During the balancing process the position of the reflecting adhesive paper the position and direction of the photoelectric sensor should keep unchanged lt 3 gt Connect Sensor Cables The photoelectric sensor should be connected to the Tacho Trigger socket of the
29. ggest information Revision D Page 24 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com Frequency 10 100 1000 10000Hz Band p E LL Le w dese I ee 1 3 Set frequency range The frequency range in the 3 line is used for spectrum analysis In 907 the frequency range is used for FFT frequency spectrum analysis The options are as the following 100Hz 200Hz 500Hz 1000Hz 2000Hz 5000Hz 10000Hz Use or 4 to move cursor to the 3 line then modify it by or gt 1 4 Set the sensitivity of the sensor Different accelerometer has different sensitivities Before using 907 the user must affirm that the value of the sensor sensitivity in 907 is the same as that the sensor manufactures presented Press T or 4 to move cursor to the place behind Sensor in the 4 line Press Enter then nothing is displayed in the cursor Use number keys to input the right sensitivity and then press Enter to confirm 1 5 Alarm multiple factor The function of alarm multiple factor is to raise an alarm when the new measured value of alarm parameter is higher than the alarm multiple factor multiplied reference value i e it shows Signal Too Strong or Bad in the 5 line Notice Alarm multiple factor is on the right of the 4 line behind Alm_S To input move cursor to the place behind Alm_S by T or 4 Press Enter then nothing displayed in the cursor place Use number keys to input th
30. he 2 line the note displays Enter to Measure Press ENTER to measure the rotation speed The RPM value on the right side of the 3 line will update continually When the rotation speed becomes stable press ENTER for a moment the 907 NOTE begins measuring vibration The data in the 4 line the left is amplitude while right is phase will update continually Stop Meas now displays on the right side of MEASURE When the rotation speed amplitude and phase all become stable press ENTER for a moment to finish the measurement You may also manually input value here without measurement When the cursor is at the 4 line you may input amplitude and phase If the length of the digit inputted is less than 5 press ENTER to finish The 5 line is unreachable for 1 plan balancing Step 3 Estimate weight of trial and then fix a trial mass on plane I Firstly calculate the weight range of trial mass WEIGHT OF ROTOR 3 000 kg according to the formula recommended by the MAXIMAL RPM 6000 ISO TRIAL RADIUS 25 00 mm BALANCE GRADE 1 000 CALCULATE TRIAL MASS RANGE Revision D Page 11 of 33 FROM 1 243 g TO 2 486 g In this page when the cursor is on the 2 line NOTE Manual of SPECTRUM 907 Field Balancer www spectrum instruments com the note displays Input How Heavy the Rotor is ENTER After the 5h digit is inputted the cursor goes to the 3 line automatically If the length of input is less than 5 press ENTER o
31. keys to input the needed amplifying multiple Notice The range of amplifying multiple is from 1 to 255 5 Measurement of Vibration Waveform Connect the sensor cable to the socket of SFB 907 and fix the sensor to the object that will be measured After power on select a point name in the Collector menu Secondly confirm all parameters of the Setting menu After pressing W Meas the SFB 907 starts to measure waveform and displays the waveform continuously The display is as the following graph You may press Enter for a while to stop CHANNEL SINGLE VEL WAVEFORM the measurement and the refresh of waveform display Then you may press lt or gt to see the other part of the waveform totally 10 screens for the whole 6 Save waveform Only the just measured waveform can be saved The method is to press W Save to enter the menu as the following TIME ms 39 Vel Waveform Single Freq 1000Hz Trig No Press Enter to Save Other Key to Quit After confirm that every thing is OK press Enter After waveform is saved the screen displays the save number of the waveform The SFB 907 can save up to 62 waveforms The screen will display Memory Overflow when the space is full 7 Recall Saved Waveform This function is to display the waveform stored in the SFB 907 so that the user can observe and analyze it Press T or J key the user may change the stored waveform while press lt or to see the other part of the
32. m line in the fifth line is changed to Wait a After a while the screen displays the overall values of Acc Vel Dis and HFA in the column of New data successively When Alm mode is Vol it displays the Peak Rms and P P of the measured voltage successively After the measuring value is displayed the device begins to calculate the frequency spectrum Then the screen displays one of the following measurement results in the fifth line No Problem Found Not A stable signal Signal Too Strong Signal Too Weak Notice Don t press any key or move the sensor before measurement results are obtained Otherwise the result of frequency spectrum analysis will be incorrect 2 Data Collect Spectrum Press C Spect key you will see the CHAMEL SINGI amplitude FFT spectrum of channel A the real line This spectrum graph includes also SPEC TRUM VEL the OLD spectrum received from FREQ computer or the spectrum memorized so 170 you can compare them the dash line If the measurement point is changed then spectrum just measured will replace the OLD spectrum received from computer or the spectrum memorized FREQ Hz 1000 Revision D Page 26 of 33 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com Use lt or gt to read the frequency and amplitude of spectrum Notice that only when the point not changed it is possible to see two spectra If you changed
33. m s VEL lt 0 5mm s Disp lt 3 um E Frequency response accuracy 5 10 for ACC 4 5kHz 10kHz E Non linearity 5 Sensors Piezoelectric accelerometer Magnetoelectricity velocity Eddy displacement and etc 8 order ellipse anti aliasing filter RPM band pass filter Input signal Accelerometer and voltage Amplitude spectrum analysis 100 lines to 400 lines zoom Hanning windowed Frequency span of spectrum analysis 100 200 500 1k 2k 5k 10kHz only for 1 channel sampling Data storage 62 waveforms of 1024 points and 240 data sets Amplitude ranges amp Frequency Response for overall vibration measurement Amplitude ranges Frequency Response Displacement 0 003 5mm __ peak peak 10 500 Hz Velocity 0 2 200mm s_ true RMS 10 1000 Hz Acceleration 0 5 250m s peak 20 5000 Hz Envelope 0 1 20unit true RMS 5 1000Hz from 15 40 kHz Voltage 0 1 10V peak peak 10 10000 Hz Revision D Page 4 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com Notepad 10 condition codes for visual inspection Output RS232C for communication with PC Power Ni MH rechargeable battery for 8 hours continuous operation low battery warning Operating Environment 0 55 C 90 humidity non condensing Rotating speed measurement with photocell sensor Dynamic Range 108dB Dimensions 21x13x4cm Weight 1 2 kg including batteries 2 BALANCE PRINCI
34. n Pa BREAK UP TO to skip this page l l Pal 120 2 369 Unit In this page the vector of balancing mass can Pad 270 2 000 Unit be found in the vector graph just on the circle Pb BREAK UP TO When the cursor is on the place showing angle Pbl ay Unit in the 3 line input the first angle Pal the first Pb2 E Unit angle is at the anti clockwise side of the balancing mass vector with the number key After the 3 Revision D Page 13 of 33 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com digit is input or pressing ENTER or 4 the cursor goes to the place showing angle at the 4 line When the cursor is on the place showing angle in the 4 line input the second angle Pa2 the second angle is at the clockwise side of the balancing mass vector with the number keys After both angles are input then the SFB 907 calculates The weights of the balancing masses to fix on the selected angles are shown on the right side of the 3 and 4 lines Assure that the sums of the two angles depart from the balancing mass should be less than 180 degree Stop the machine fix balancing mass on the rotor according to the result presented by 907 The balancing mass is removed or remained should consist with the settings in the step 3 Restart the machine When the rotation speed becomes steady press Pg Dn to the next page MEASURE speed r min ial as ES ROTATION SPEED 3660 In this page in the 2 lin
35. otation Speed Measurement The SFB 907 measures rotation speed by using a photoelectric sensor to detect the light 0 FREQH2z 1000 reflected from a piece of reflecting paper on the rotating axis The measuring method is as the following 1 Connect the photoelectric tacho sensor with SFB 907 and make the lighting end of the sensor to aim at the piece of reflecting paper affixed on the rotating axis 2 Power on SFB 907 Press Tacho key If you want to stop the measurement of rotational Speed r min speed press another key for a while then release it Freg Hz oem The rotational speed may be saved with waveform in order to diagnose machinery faults The method is to measure the rotational speed first and then measure the vibration Revision D Page 30 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com 12 Special Explanation Acceleration envelope analysis The SFB 907 uses high pass filter and the demodulation method to separate the envelope signal You may measure the RMS value of envelope as well as analyze its waveform and spectrum by selecting ENV as Alm_mode Measure by eddy displacement sensor or velocity sensor Connect the sensor with the VOL input socket and use VOL as Input mode in Setting menu or Alm_mode in Collector menu Save collector data and waveform Future Battery Charge The SFB 907 uses chargeable batteries The battery
36. r 4 to go to the 3 line In the 3 line input maximal rotation speed with the number keys In the 4 line Input the maximal radius at which trial masses fixed In the 5 line input the required balance grade according to ISO1940 In the 6 line press Enter to calculate weight range of trial mass Stop the machine fix a trial mass on plane I according to the calculation and then restart the machine TRIAL I MEASUREMENT TRIAL LOCATION 60 TRIAL WEIGHT 3 000 U AFTER MEAS REMOVE In the next page the cursor is on the 2 line input the angle at which the trial I lies Notice that the phase should be between 0 360 In the 3 line please input how many weight units you used for i MEASURE speed r min trial I ROTATION SPEED 8765 In the 4 line please select whether trial mass Aa 4 645 um Pa 120 is removed afterward Press ENTER repeatedly Ab um Pb E REMOVE and REMAIN are shown circularly Speed r min is displayed on the right of MEASURE If you want to see certain measured value move the cursor there and then the value is displayed the value can also be edited When the cursor is on the 5 line press ENTER to start the measurement of rotation speed The data at the 6 line will update continually When the rotation speed TRIAL I RESULT becomes stable press ENTER for a moment Pa CHANGE 300 the 907 begins measuring vibration The data in Aa CHANGE 60 00 the 8 line the
37. ruments com result is not acceptable repeat the operation The influence coefficients could be borrowed from the last ROTOR NUMBER 1 measurement tetera SETTING siisii NUMBER OF PLANE 2 4 2 2 WITH INFLUENCE COEFFICIENTS INPUT MODE Sen Step 1 Setting Parameters MEAS MODE Dis Press down POWER ON on the panel for a SEN a 5 000 pCims moment without any operation the 1 page is opened SEN b 5 000 pC ms Now it is time to set parameters WEIGHT UNIT 11 22 g The operation of this page except line 9 is the HAVE INFL COEF YES same as that without influence coefficients CLEAR DATA In line 9 YES should be selected to indicate the NOTF coefficients are known Step 2 Initial measurement The operation of this page is the same as that without influence coefficients CALCULATE Plane I to Point a 1 235 mm s Unit 174 Plane I to Point b 3 254 mmv s Unit 300 Plane II to Point a After all the influence coefficients are input press Pg 4 236 mm s Unit 254 Step 3 Input influence coefficients In this page move the cursor down to the 4 line then input the coefficient of plane I to point A Then input the other 3 coefficients Dn to the next page Do not press ENTER at the 2 line Plane II to Point b A ee eas 2 014 mm s Unit 243 Step 4 Calculation decomposition and verification The operations of these pages are the same as that ae without influence coefficients 5 V
38. sion axis of an auto Flexibly fixed crooked axis transmission set of high RPM 4 stroke engine with 6 or more gases Crooked axis transmission set of an auto a truck Transmission axes with special requirements axle rotating axes all way axes Parts of crusher G16 Parts of agricultural machine Engines of auto truck and locomotive the whole of diesel or gas engine Crooked axes transmission set of provider with 6 or more gases under special conditions being sensitive to vibration or there is sets for isolate vibration The whole of a engine with special demands Rigid rotor of turbine generator Disks and drums of a computer Turbo compressor G2 5 25 Transmission set of a lathe General or great armature with special demands Transmission set of tape recorder and gramophone photograph Gl 1 Transmission set of grinding machine Small armature with special demands Main axes grinding wheel and armature of a precise grinding machine 0 4 Gyroscope Parts of master engine Tub wheel of centrifugal machine Roller of paper machine roller of presswork Fan Rotor of assembled aviation turbo line G6 3 6 3 Flywheel Pump wheel Parts of lathe and general mechanical General or great armature without special requirements the height of electricity s axes center is at most 80mm Small armature which is often yielded a great deal and used under the conditions of not Revision D Page 32 of 33 2011 3 2
39. ss ENTER at 2 line the balancing mass is calculated and shown in the 3 line The location of trial mass is also shown with vector graph The 4 line is unreachable for single plane balancing Step 5 discompose vector The operation of this step is the same as that without influences Step 6 verification The operation of this step is the same as that without influences 4 2 2 PLANES BALANCING Plane 1 x Plane 2 Accelerometer for Measurement A Put this switch to External Tacho Trigger innernExternal Trigger Switch oltage Channel B Accelerometer for Measurement B Accelerometer Channel 8 Accelerometer Channel A Tacho Measurement Illustration of accelerometer location and cable connection 4 2 1 WITHOUT INFLUENCE C OEFFICIENTS In line 1 of 1 page SETTING the note displays Which Rotor to Balance Input rotor number with a number key from 0 to 9 After the input the cursor goes to the 3 line automatically If no changes are needed press T or 4 to move to other line the following are the same Line 2 title the cursor cannot arrive Line 3 select type of operation When the cursor is on the 3 line the note displays How Many Plane Revision D Page 16 of 33 ROTOR NUMBER 1 NUMBER OF PLANE 2 INPUT MODE Sen MEAS MODE Dis SEN a 5 000 pC ms SEN b 5 000 pC ms WEIGHT UNIT 11 22 g HAVE INFL COEF NO CLEAR DATA NOTE
40. table press ENTER for a moment the SFB 907 begins measuring vibration The data in the 7 and the 8 line amplitude and phase are updated continually Stop meas is shown on the right of MEASURE When the rotation speed amplitude and phase all become steady press ENTER for a moment to finish the measurement If the cursor is moved down without measurement to the 6 line the note displays Incapable of input SKIP IT When the cursor is at the place showing amplitude in the 7 line you may also manually input Amplitude and Phase for point A Dees Pa CHANGE 300 In the 8 line you may manually input Aa CHANGE 30 0 Amplitude and Phase for point B Pb CHANGE 190 Then press Pg Dn to the next page after the Ab CHANGE 20 0 input or measurement TRIAL II VALID YES This page displays the result after fixing trial Il The 2 and 3 line display the change of vibration phase and amplitude of point A before and after the fixing of trial mass II The 4 and 5 line display the change of vibration phase and NOTE amplitude of point B before and after the fixing of trial mass II If the data shown on the 2 and the 4 line are both larger than 25 0 YES is shown on the 6 CALCULATE line indicating that the trial II is valid the note displays Plane I to Point a Trial II is Feasible 1 235 mm s Unit 174 Plane I to Point b 3 254 mm s Unit 300 Plane II to Point a 4 236 mm s Unit 254 Plane II to
41. the point and then go back only one spectrum is visible the new one The user may look at the spectrum details by first move cursor to a specific frequency and then press ZOOM key 3 Use Notebook Machinery vibration is usually related to other operation parameters For example the pressure of lubricating oil and the temperature of bearing reflect the state a bearing and influence the vibration of a machine The high temperature of motor winding usually indicates short circuit or overloaded and influence the vibration of a machine To comprehensive evaluation of machinery condition it is very important to record the parameter change together with vibration The function of Notebook is to save these technological parameters When press Notebook key The screen displays the following Type Temperature Old XX XXXX New KX KXXX Note 0 0K Now the type of the parameter could be changed by lt or Options include Temperature Pressure Load or Current Other Parameter Use Tor to move the to the line of New then press Enter the space is cleared Now input the value by the number keys Then press Enter to confirm The user may also save vague observations of machinery condition in the last line The 907 has ten vague observation code options 0 Ok 1 Not In Use 2 Seal Leaking 3 Much Noise 4 Oil Level Low 5 Very Hot 6 Bear Changed 7 Seal Changed 8 Pre Flow Low 9 Other States At the pl
42. the vibration of two measurement points respectively 3 Get conclusion of the correction mass If the influence coefficient is known it can be input directly and the above step 2 can be omitted Revision D Page 6 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com affirm 1 plane balancing needed paste reflecter slice mount photoelectric sensor and vibration sensor start the machine select 907 s 1 plane balancing function measure initial vibration with influence coefficient no influence coefficient halt machine install a trial mass and input its weight and angle restart the machine input influence coefficient measure amplitude and angle of the vibration get the result of calculated balancing mass get the result of calculated balancing mass and influence coefficient halt machine install balacing mass according to the result presented by the device restart the machine and measure the vibration the vibration should decrease evidertly usually the result is less than 20 of the initial vibration if the result is still dissatistying try again the influence coefficient could be borrowed from the last measurement repeat till the result is acceptable 1 Plane Balancing Revision D Page 7 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com affirm 2 plane balancing needed paste reflecter slice mount photoelectric sensor
43. trums for this parameter There are five options of alarm parameters ACC acceleration VEL velocity DIS distance HFA high frequency acceleration and VOL voltage Move the cursor to the place after Alm mode then select the parameter by lt or gt Notice The parameter set here is also used for the dynamic balancing The definition of overall vibration value may be briefly explained as DIS Displace Equivalent Peak to peak value the maximum vibrating distance between the positive amplitude and the negative one of the vibration DIS is usually used on the occasion where the gap of the machine parts is critical Its unit is um 1 1000 mm VEL Velocity True root mean square rms of velocity often written as Vims It is usually used for the evaluation of machine condition Its unit is mm s ACC Acceleration Equivalent peak value of acceleration Ap which equals to the value of root mean square acceleration Ams multiplying 1 414 Its unit is m s ENVE HFA High Frequency Acceleration Envelope RMS of the envelope signal of high frequency acceleration after filtering off low frequency lt 1kHz VOL Voltage VOL adopted when using other sensors that output voltage signals Its unit is V To select a suitable parameter for fault diagnosis the user must consider its sensitivity to frequency range as listed in the following The most important principle to choose is to provide the bi
44. ursor goes to the 7 line Line 7 input sensitivity of sensor B by the same method as above Line 8 input the weight of each trial mass unit Line 9 confirm whether the influence coefficients are known Press ENTER repeatedly YES and NO is shown circularly The one being shown is selected Here NO indicates the coefficients are not known Line 10 clear all data of the rotor being operating on Press ENTER the following is shown on the 11 and 12 line ARE YOU SURE ENTER YES OTHER NO If you surely want clearing press ENTER the measuring data will be cleared and the balancing grade and sensor sensitivities change to default values At the same time the 11 and 12 line are cleared If press another key no data will be cleared Before a balancing operation is performed each line of this page must be configured If no change required for certain line skip it by press or J After the configuration wherever the cursor lies press Pg Dn to go to the next page Step 2 Initial measurement When the cursor on the 2 line Speed r min is shown on the right of Revision D Page 17 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com MEASURE All the places showing values are INITLAL MEASUREMENT vacant If you hope to see the previous value move MEASURE Speed r min the cursor to where it lies and then the original value ROTATION SPEED 4830 is displayed The value is also editable When
45. waveform totally 10 screens for the whole waveform Notice The recalled waveform number increases no matter what button that you press T or V If it reaches the biggest number it will return to the smallest in circles Revision D Page 29 of 33 2011 3 2 Manual of SPECTRUM 907 Field Balancer www spectrum instruments com 8 Spectrum Analysis CHANNEL SINGLE SPECTRUM VEL FREQ 170 OLD Once a waveform is measured you may analyze the frequency spectrum at once by press W Spect If you just recall a waveform and then press W Spect you will see the spectrum NEW of the stores waveform 54 The screen of spectrum displays as the following graph The original location of the cursor is in the place of zero frequency FREQ Hz 1000 Press or O to move the cursor The frequency and the amplitude of the cursor location is displayed at the right of the screen If you want to see spectrum of another channel of dual channel mode press Channel key 9 Spectrum Zoom You may observe the details of amplitude spectrum by ZOOM function After moving the cursor to a interesting frequency press Zoom to see the 4 times detailed spectrum This is applicable for both C Spect and W spect STATIC TRANSFER FUNC TION 10 Transfer Function 0 98 PO Transfer function is the spectrum in proportion to the ratio of output and input signal amplitudes B A in every frequency Notice valid only for dual channel measurement 11 R
46. won t automatically shut off The user may push down the Off button to shut it off The data will be automatically saved when the device is shut off 2 If the SFB 907 has not been used for a long time it should be charged first and its memory should be formatted The user may format the memory according to the screen of Setting parameter The SFB 907 should be shut off when being charged It will take about 8 hours to charge an empty battery up to full power 1 Data collector Only future can be used as data collector After pressing On the screen appears Notice 1 If nothing is shown in the screen press Off and then press On for a moment again 2 The instrument has 2 channels A and B auxiliary The function of data collector only operates on channel A Wave measuring on channel B or on the both channels could only be done by the function of signal analysis 3 The function of data collector may be used as spectrum analysis of channel A 4 How to fix the sensor will influence measurement in the way Alm mode VEL Freq Range 1000 Hz sensor 5 00 Alm 5 3 0 Alamm Status OK NEW data OLD data ACC f VEL i DIS f i HFA E Screw highest precision best frequency range best fidelity E Magnetic base moderate precision frequency range and fidelity E Hold the probe lowest precision frequency range and fidelity 5 When collecting data or waveforms the user should check up if
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