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vbSeries Instrument Reference Guide

1. ssessssssssssssseseeeeeeeennnnnee 133 vii b Weight Orientation ccccccccsceeeseeceeeeeceneeeeeeeeeeeeeseeeeseaeeneas 133 Tach TrOQOr ooo eere ER 134 Weight Lin DIST E 134 SIR 134 Combining Trim WV GIGS uiid ie ette aberant 134 Step 3 Take a Trial Reading 135 Reviewing Previous Balancing Jobs 139 Section 12 Balancing Walk through vb7 and vb8 Instruments Only espacio 140 Step 1 Set Up a New Balance Job 140 Step 2 Take an Initial Reading 141 Step 4 Balance the Rotor essesssesusss 142 Step 5 Perform Trim Balancing ssssssuussss 143 Step 6 Viewing and Saving Balancing Jobs 145 Section 13 LS cen inia noir ondans 146 Setting the Date and Time eeseessseesesss 146 Adjusting the Date Format sssnn 147 Selecting Your Local Timezone 147 Adjusting Sound Volume esesseeeeeeees 147 Set the Instrument Language seeeeeeess 147 Printing Directly to a Network Printer 148 Adjusting Screen Contrast eeeesssesusss 149 Turning the Backlight On Off ioco eer tetto por npe eeu SeC 149 R
2. 48 Section 4 Analyzing Measurements Onsite Store Units Max dB Value Max dB Value Linear Scale Log Scale Acceleration m s mm s m s mm s Velocity mm s um s mm s m s Displacement mil mm um mm um Current mA pA mA pA Store Units Y Axis Fixed Y Axis Fixed Linear Scale Log Scale Acceleration automatic current mm s m s mm s Velocity automatic current m s mm s m s Displacement automatic current m mm um Current automatic current A mA pA vdB The vibration velocity level vdB is defined as 20 times the logarithmic of the ratio of the RMS velocity level to a reference velocity value the vdB reference The value 1e 6 mm s is an abbreviation for 1x10 mm s and is the SI reference level The value 1e 5 mm s is the reference level used by the US Navy and many American industries adB The vibration acceleration level adB US is defined as 20 times the logarithm of the ratio of the RMS acceleration level to 1 ug RMS The SI version of adB is less commonly used and has a reference value of 1 um s Setting the RPM Setting the 1X RPM allows you to view the chart in orders for spectra or revs for waveforms You can enter the RPM manually if you know it or set the RPM from a spectral 1X peak Section 4 Analyzing Measurements Onsite 49 Entering the RPM manually e With a measurement displayed press then Set RPM e Enter a value using the number keys then press Entering the RPM using
3. Section 9 Using Routes 107 ee e Section 10 Creating Editing and Deleting Items This section describes the procedures for creating folders machines and other items within the instrument You will learn to Create and manage machine structures sensors and notes Copy and delete items Restore items Rename and edit items Attach and remove notes Storage Capacity and Recording Volume The instrument s storage capacity is determined by the amount of available memory space which decreases as more recordings are stored There is no limit to the number of routes folders and machines that can be held in the instrument The number of recordings that can be stored depends on the type and setup of those recordings e g more 400 line spectra can be stored than 10 minute long time waveforms because the spectra take up less memory space How are Recordings Organized and Stored In addition to analyzing recordings onsite you can also store recordings in your instrument then transfer them to a PC These recordings can then be analyzed at a time of your choosing Analysis is best carried out away from machines in a safe quiet environment The instrument uses the following hierarchical data storage structure 108 Section 10 Creating Editing and Deleting Items 4 route is made up of machines points and locations Starting at the bottom of the diagram a recording is the data you collect at a particular location on
4. 134 Section 11 Balancing Rotors vb7 and vb8 Instruments Only vb 1 Press the left hand arrow key beside Plane A or Plane B then press Adjust Weights The Adjust Weights Menu displays the locations and amounts of your individual trim weights the weight vector Existing Total and the target weight and angle the trim weight angle solution you hope to achieve Adjust Weights Plane A t Rotation 87g 84 0 WR fal Po ge A X U LA i lt 1319 17 g A1 7 WR f Existing Total Suggested Add 747 g 185 0 WR Target Weight 848 g 73 5 WR Use the left hand arrow keys to highlight one of the trim weights you want to remove then press Remove or Keep The calculator will re calculate the suggested weight angle accordingly You can experiment with different remove keep combinations by repeating this process to add a subtracted weight back to the calculator press again When EJ are satisfied with the suggested weight calculation press to continue To exit the menu without combining any trim weights replace any removed weights before continuing Step 3 Take a Trial Reading Stop the machine Section 11 Balancing Rotors vb7 and vb8 Instruments Only 135 r x Establish a reference mark on the balancing plane This will be used to measure the angular position of the trial weight and the final balance weights The reference mark can be at any position around the balancing pla
5. Section 11 Balancing Rotors vb7 and vb8 Instruments Only 133 RaM Against rotation AR means that if the rotor is turning forward then you place your weights backwards from the reference point i e in the opposite direction of the rotor s rotation Ensure that with the rotor stationary you measure angles in the direction specified Do not rotate the rotor in the direction specified Tach Trigger Tach Trigger allows you to specify whether you are using a standard tachometer or a Keyphasor Weight Lin Dist Weight Lin Dist allows you to specify the measurement units for linear speed distance balance weights and rotor weight e To change the displayed units press ES Weight Lin Dist then press to cycle through the linear speed options or to open the Weight Units Menu where you can set balance and rotor weight units e When you have set your units press to navigate back to the Balance Setup Menu Store Units Store Units allows you to specify your preferred measurement units and overall scaling for balancing jobs Combining Trim Weights As you continue to fine tune a balance job you may end up with several trim weights fixed at various angles on the balancing planes You can combine all trim weights for an individual plane into one weight angle solution using the Adjust Weights calculator e After taking a trim reading press to display the Trim Weight Menu or from the Balancing Menu Balance Readings
6. Waveform chart displaying Revs on the X axis Saving Measurements e Stop the measurement by pressing then press E Save You now need to select a machine point and location to save the measurement to or create these now Section 4 Analyzing Measurements Onsite 51 x Selecting an existing machine e Press Save to keys r3 to KA depending on the number of channels used for the measurement then press or to scroll up and down and press Expand Navigator repeatedly to expand out a machine so that its points and locations become visible Press to save the recording to your chosen location Creating a new machine e Press Save to keys nm to c depending on the number of channels used for the measurement then press Create New Machine The following image shows the machine creation icons after pressing to display hint labels Collapse gt Navigator Expand 7 Navigator Default Folder Create New Machine Create New Oo Point Create New Axis Creating a new machine to save the measurement to e Enter a name for this machine then press e Repeat this process to create a point El then press and use the arrow keys to select a location Press until you see the message Data Saved 52 Section 4 Analyzing Measurements Onsite we S Section 5 Setting Measurement Options This section describes the different parameters used to take measurements and how to apply them
7. 1 0 1 dB 0 1 dB from 10 Hz AC or 0 Hz DC to 15 kHz 3 dB from 1 Hz AC or 0 Hz DC to 40 kHz Effective limit is sensor sensitivity and output voltage Other distortions and noise are lower 0 peak peak peak or RMS Auto scale by 1000x when required US amp SI options for both adB amp vdB Digital readouts on chart For DC level F S amp AC measured at 100 Hz Acceleration and velocity From value measured at 100 Hz Spectrum Display Fmax possible ranges Fmin possible range Resolution Frequency scale Amplitude scale Window shapes Overlap Number of averages Averaging types Demodulation bandwidths 25 50 100 125 150 200 300 400 500 600 800 1000 1200 1600 2000 2500 3000 4000 5000 6000 8000 10 000 15 000 20 000 30 000 40 000 Hz 0 to Fmax 400 800 1600 3200 6400 12 800 lines Hz CPM Orders Acceleration velocity displacement current or user defined Hanning rectangular 0 12 5 25 37 5 50 62 5 75 87 5 1 2 4 8 16 32 64 128 Linear exponential peak hold synchronous 21 bandwidth options Or equivalent CPM values Or orders based from 1X to 999X vb instrument zeroes all spectral lines below Fmin 3200 lines max for dual channel measurements Linear scale with zooming Linear or log scales auto or manual scaling Dependent on Fmax and number of lines Increases sampling time proportionally From 125 Hz to 1250 Hz up to 16 kHz to 20 kHz Wave
8. Setting Measurement Options we S In general the higher the operating speed of the machine the higher the Fmax needs to be to capture all crucial information For vibration involving fingered elements such as gear teeth fan blades pump vanes and bearing elements an Fmax equal to 3 times the number of fingers multiplied by the operating speed is usually sufficient For vibration not involving fingered elements an Fmax equal to 40 times the operating speed is usually sufficient You can specify the Fmax of a measurement either as an exact value or as a multiple order of a machine s running speed e Select your measurement type then press 8 Fmax Fmin The options labeled 40 X and 10 X represent orders of running speed The option X allows you to enter your own number of orders e Press one of the orders keys and enter your machine s default RPM value e Press twice to return to the measurement setup When you take the measurement the resulting display will use an Fmax with the specified number of orders the value will be rounded up to the closest Fmax if an exact match is not available Spectral Lines The resolution of the spectrum increases with the number of spectral lines used i e the more spectral lines the more information the spectrum contains However the more spectral lines used the longer the measurement takes Use many spectral lines only when required e g when you need to distinguish between two closely
9. You will learn What the various parameters are for spectra waveforms and other measurement types How to create parameter sets for taking measurements What measurement units and overall scaling options are available How to assign sensors to channels Setting Measurement Units and Spectrum Scaling You can choose the standard US or SI units or choose your own preferences The table below summarizes the options To set a preference from the Main Menu press al Options then press Measuring Units Press a repeatedly to toggle which unit set is displayed To set your own preferences select Custom then press the keys beside the first option you wish to change Most on screen options will open a sub menu press the keys repeatedly to cycle T the various options When v you have finished press to save and return to the Measurement Units Menu Section 5 Setting Measurement Options 53 eee Scaling JUNE NALE pk pk mm s in s As above Frequency Hz CPM Hz CPM vdB Units vdB SI 1e 6 mm s vdB US 1e 5 mm s vdB US vaB SI adB Units adB SI 1 um s adB US 1 ug adB US adB SI Linear in mm in Speed Distance Weight lb oz Ib oz tons kg g Balancing Units Acceleration Velocity Displacement in s mm s mm um mil RMS 0 pk pk pk 54 Section 5 Setting Measurement Options vb Setting Measurement Parameters When you select a measurement type e g Spe
10. e Use the left hand arrow keys to select a keypad entry or press to create a new one gt f you are creating a new keypad entry use the arrow keys to highlight it then press Unit to select the type of unit you wish to measure gt Press 6 Display and create the text that will display on screen when you collect the data e g Enter Machine RPM Text To Display Enter Machine RPM Capitalisation AA 80 Section 6 Measurement Types and Their Uses we S e Now instead of taking a measurement press and enter your value using the keypad e Press to select a machine location to save this data to Use the left hand arrow keys to scroll up and down and press 7 Expand Navigator repeatedly to expand out a machine so that its points and locations become visible Press to save the data to your chosen location Average Value Measurements Applies to DC coupled sensors only Records the average DC value during a user specified measurement period The Average Value can be trended and alarmed in the Ascent software For example use this feature to measure proximity probe gap For vb7 instruments this is the only likely application of Average Value measurement as the other supported sensor types Acc Vel Displ are typically AC coupled vb6 and vb8 instruments also support Frequency Voltage Temperature Pressure Power Force Volume Flow Rate Mass Flow Rate and user defined units This capability allows these two
11. ignitable concentrations of gases are normally prevented by positive pressure or mechanical ventilation and which might become hazardous through abnormal operation of the ventilation equipment The approval specifically covers use in the United States of America and also any other countries which recognize the CSA certification When using a certified vbX in a hazardous location the installation must comply with the vbX Installation Control Drawing for Hazardous Locations including all its foot notes and warnings This drawing number CIL2100VBX is inserted on the following page The vbX instrument will be supplied complete with appropriate sensors for use in Class Div 2 environments As indicated on the drawing alternative sensors may be used provided they are certified for use in these locations and their entity parameters meet the limits shown on the drawing Section 1 Introduction 7 vbX INSTALLATION CONTROL DRAWING FOR HAZARDOUS LOCATIONS Drawing Number CIL2100VBX Entire drawing is for Hazardous Location Class I Division 2 Groups A B C D Any oop powered sensor IEPE ICP with certified input entity parameters Vmax z 26 4 V max 2 47 mA Pmax 310 mW Li lt 28 mH Lung Ci 360nF Corrie Any externally powered sensor with certified output entity parameters Voc 30V Isc lt 25 mA La z Liable Ca 2 2 nF Coss Not to be used in hazardous locations Any vbX powered sens
12. ssssesseeeeenn 42 Using GUIS OFS iis iei Reed s ciet ie aree rete aene een 43 ZOOMMIAG e 45 Viewing Multiple Charts sseeeeeeeeeeeesees 46 Changing Chart m edad 46 Setting the Y Axis Amplitude Scale 47 Amplitude Display Units ciipuce tiet pine teneo Erie Rs baus 48 Setting ihe PM asco oats oes cea aere esenecuu chm ire ete nres dubie 49 Viewing Orders t 50 Viewing Revolutions eeesseeeeee 51 Saving cci nd 51 Section 5 Setting Measurement Options 53 Setting Measurement Units and Spectrum Scaling 53 Setting Measurement Parameters suuuuus 55 Creating Your Own Parameter Sets ssss 56 Assigning Sensors to Channels ssssssssss 57 Explaining Spectrum Parameters 58 urbem 58 Spectral LINES iieri aei anae aeie aa eaaa eaaa 59 E A A E E T 59 Tach TJET eesnik EEE p UE ees 60 we E S eem 60 Number of Averages sess 60 Average Type En 60 Average Overlap ssssssssssesesseseeeeeeneree nenne 61 lade M dae 61 Explaining Waveform Parameters ssssssss 62 Equivalent F maera ee etate en rite 62 Number of Samples sesssesssssseseeeeenneneennenennent
13. 10 hours Backlight on 60 second timeout Charger type Internal charging automatic control External Power pack 12 V DC 3 A output included in kit Charge rate 3 A nominal 3 hours for complete charge Mechanical Size 9 9 W x 5 8 L x 2 4 H 252 x 148x 60 mm Weight 2 7 Ib 1 2 kg Including battery and strap Environment Operating Temp 14 F to 122 F 10 to 50 C Storage Temp amp Humidity 4 F to 140 F 20 to 60 C 95 RH EMC EN61326 Ruggedness 4 1 2 m drop onto concrete IP65 Procedure 26 drops following MIL STD 810F 516 5 IV Revised 12 March 2008 While every effort has been made to provide the most accurate information we advise that information in this document may contain technical inaccuracies or typographical errors Commtest Instruments Ltd may at any time and without notice make improvements and or changes to the products described 160 Appendix Specifications we S vb6 Specifications Model vb6 Remarks Sensors Sensor input 4 channels Simultaneous sampling Sensors Accelerometer Velocity Displacement Current Voltage Output AC coupled range DC coupled ranges Connectors Analog to digital conversion Sensor excitation current Sensor detection 16 V peak peak 0 V to 20 V 10 V to 10 V 20 V to 0 V 1 x BNC CH1 and 1 x LEMO CH2 CH3 CH4 24 bit ADC 0 mA or 2 2 mA configurable 24 V maximum Warns if short circuit or not connected Allows for 8 V sens
14. 62 Belo 62 Other Measurement Parameters sssssessss 63 Section 6 Measurement Types and Their Uses 64 SDECNBITI atc da Louise tese usas acd eie uM cate sete 64 WU STON wees RR T TM 65 Demodulation Explained ssssseseeees 66 Analyzing Demodulation Data eese 67 lg MT TT Cc CUM 68 Demod SDSONDTI ssir a irapa 70 Tachometer Displays o 70 Time Synchronous Averaging sseeeeeeeeeees 71 Uo Mo Bet 72 Coast down Run up eeeeeeeseeceeeeeeeeeesssseeeeeeeeeeeeeneneeeeees 73 Cross Channel Phase Explained 74 Fault Types and their Phase Relationships 75 Measuring Cross Channel Phase sss 76 Long Time Waveforms Explained susssss 78 Measuring Long Time Waveforms eeseeeese 78 Viewing Long Time Waveforms on your PC 79 Keypad Enty RN ET T 80 Average Value Measurements ssseeeeeeees 81 Taking Multi channel Simultaneous Measurements 82 Setting up Sensors and Channels sssssssss 82 Saving Multi channel Measurement sssssssss 83 Section 7 Taking Recordings Offsite Analysis 85 Walk through Taking Recordings cceeeeeeeeeeeeeeeees 85 Taking Individual and Mu
15. AC measured at 100 Hz Acceleration and velocity From value measured at 100 Hz Spectrum Display Fmax possible ranges Fmin possible range Resolution Frequency scale Amplitude scale Window shapes Overlap Number of averages Averaging types Demodulation bandwidths 25 50 100 125 150 200 300 400 500 600 800 1000 1200 1600 2000 2500 3000 4000 5000 6000 8000 10 000 15 000 20 000 30 000 40 000 Hz 0 to Fmax 400 800 1600 3200 6400 12 800 lines Hz CPM Orders Acceleration velocity displacement current or user defined Hanning rectangular 0 12 5 25 37 5 50 62 5 75 87 5 1 2 4 8 16 32 64 128 Linear exponential peak hold 21 bandwidth options Or equivalent CPM values Or orders based from 1X to 999X vb instrument zeroes all spectral lines below Fmin 3200 lines max for dual channel measurements Linear scale with zooming Linear or log scales auto or manual scaling Dependent on Fmax and number of lines Increases sampling time proportionally From 125 Hz to 1250 Hz up to 16 kHz to 20 kHz Waveform Display Number of samples Time scale 1024 2048 4096 8192 16 384 32 768 10 ms to 512 seconds Or orders based from 1 to 999 revs Logging Features Output formats Data storage Data storage structure Max Folder size vb screen transfer to Ascent PC based software 1 GB non volatile flash memory Folders machines points locations routes 10 000 measu
16. Acceleration Section 10 Creating Editing and Deleting Items 117 m x Using the Bias Voltage Check The Bias Voltage Check allows the instrument to warn operators of errors or fault conditions such as short circuits faulty sensors or open circuits by comparing the actual sensor bias voltage with the expected voltage range as configured in the instrument Most accelerometers have an output voltage centered on 12 V DC so the instruments have a default bias voltage range of 8 V to 16 V Some sensors may utilize a lower or higher bias voltage If using such a sensor review the manufacturer s documentation and create a new Bias Voltage range to suit To change the sensor s Bias Voltage range settings From the Main Menu press o Options Press E Sensor Setup Press the Change Sensor button opposite the channel you will use Press 2 Edit Sensor to edit the configuration of an existing sensor or Create New Sensor Configure the sensor s normal parameters name type settling units etc Press Gi Bias Voltage Check to open the Bias Voltage screen Note that each press of toggles the Bias check on off Press Create New Bias Voltage Press Ed and enter a name You may wish to use the name of the sensor then press Press EI Min Bias and enter the minimum bias Voltage level then press 118 Section 10 Creating Editing and Deleting Items we S Press Max Bias and enter the maximum bias voltage level then
17. Diameter Ratio Balancing Technique 1000 RPM or less More than 1000 RPM 150 RPM or less More than 150 RPM 0 5 or less Single plane balancing Dual plane balancing More than 0 5 Single plane balancing Dual plane balancing Note Before attempting to balance a rotor you must confirm that the cause of vibration is uneven mass distribution in the rotor Good balancing results can be obtained only if vibration is caused by uneven rotor mass distribution Attempting to balance a rotor with other problems will not in general reduce the vibration level The Balancing Process A rigid rotor can be balanced in one or two planes The following steps are involved Setting Balancing Parameters Select the units and balancing method Initial Reading Measure the initial imbalance 124 Section 11 Balancing Rotors vb7 and vb8 Instruments Only we S Trial Reading Attach a trial weight to the balancing plane and take another measurement For dual plane balancing the same is also done for the second plane Balancing Attach correction weights to the balancing plane s as recommended by the instrument Trim Balance Take a measurement in each plane to confirm that the rotor is balanced Any residual imbalance can be removed via additional trim balance cycles Tips for Balancing Before performing a balance job clean the rotor removing any dirt or loose hanging material such as rust flaking paint etc wh
18. Hanning rectangular 0 12 5 25 37 5 50 62 5 75 87 5 1 2 4 8 16 32 64 128 Linear exponential peak hold 21 bandwidth options Or equivalent CPM values Or orders based from 1X to 999X vb instrument zeroes all spectral lines below Fmin 3200 lines max for dual channel measurements Linear scale with zooming Linear or log scales auto or manual scaling Dependent on Fmax and number of lines Increases sampling time proportionally From 125 Hz to 1250 Hz up to 16 kHz to 20 kHz Waveform Display Number of samples 1024 2048 4096 8192 16 384 Time scale 10 ms to 256 seconds Or orders based from 1 to 999 revs Logging Features Output formats vb screen transfer to Ascent PC based software Data storage 1 GB non volatile flash memory Virtually unlimited recording storage Data storage structure Max Folder size Folders machines points locations routes 10 000 measurement locations No limits are applied 50 character names Display amp Communications Display Resolution Viewing area Backlight Communications with PC Graphic Grayscale LCD 480 x 320 pixels HVGA 4 6 x 3 1 117 x 79 mm White LED 4V 100 Cd m2 USB and Ethernet PROFLASH allows vb software to be upgraded Appendix Specifications 159 RaM Specifications Model vb5 Remarks Battery amp Charger Battery Type Custom Lithium lon pack 7 4 V 4500 mAh Operating time
19. Menu When you create new machines they will be placed in whichever folder is currently selected To change a folder from the Main Menu press Folders then use the arrow keys to select a folder then press Renaming a Folder e From the Main Menu press Folders e Use the arrow keys to select the folder then press E Edit Name e Edit the name as required then press Deleting a Folder e From the Main Menu press Folders e Use the arrow keys to select the folder then press E Delete Folder Restoring a Deleted or Over Written Folder A folder backup is automatically generated every time a folder is deleted If you wish to recover recordings or routes that were previously stored in a folder that has been deleted the entire folder can be recovered using this backup Note that this also applies to folders which have been overwritten by a Send operation from the 110 Section 10 Creating Editing and Deleting Items we S Ascent software The folder s restore point will be the date and time of its original deletion e From the Main Menu press Folders e Press The Restore Folders screen will open e Use the left hand menu arrows to select a folder to restore The date beside the folder indicates when it was deleted e Press to restore the selected folder Note If you have created a new folder with the same name as the backup folder the existing folder will be overwritten during the restoration process To prevent this rena
20. Menu where it can be selected and attached to other items To permanently delete a note see the next topic Use the arrow keys to highlight the item with the note attached Press J to display the Note Menu and highlight the note you want to remove Press 5 Delete Note then press to return to the previous menu Deleting a Note Permanently From the Main Menu press EI Record Review Press EJ to display the Note Menu then press Section 10 Creating Editing and Deleting Items 121 e Inthe Note Entry Menu use the arrow keys to select the note then press Delete Note e f the note is attached to any items you will prompted to confirm your action Press to confirm Deleting all Recordings in a Folder To delete an individual recording please refer to topic Deleting Recordings on page 89 e To delete every recording in a folder from the Main Menu press Folders e Use the arrow keys to select a folder then press LI Delete Recording Press to confirm Deleting all Stored Information All folders machines parameter sets recordings and notes etc are stored in a single container called a database To clear out all your machine structures customized settings and recordings you can empty the vb instrument database This restores the instrument to its factory default settings Use this procedure only if the database becomes corrupt or if you are certain that you no longer require any of the information stored in
21. NOIes iex xen xe red 120 Attaching NOS eiie eter teniente oret textes 120 M WING NOS m 121 Hemoving NOIGS neret nere Dee EDU 121 Deleting a Note Permanently seseeeeeees 121 Deleting all Recordings in a Folder 122 Deleting all Stored Information 122 Section 11 Balancing Rotors vb7 and vb8 Instruments Only uuresnkannuphnuu n unk Fb app ER pau Ea gi 123 Methods for Balancing Rotors ssssssss 123 The Balancing ProCeSs voi bec axe ecc biUpU S eeDSUC 124 Tips Tor Balancing ud oia range lbi ici E teda eae 125 The Tachometer eene serpiente Racial ddl Ra lanta rad 126 Suggested Trial Weight Mass and Location 126 Manually Entering Balancing Information 126 Setting up a Balancing Job esesessessusss 127 Balance Planes and Weight Positions 128 Balance Planes oecscccacix cieitdsstecsteesveatevsbecsasvasiascavseenctaxevers 128 Weight Position Reference Mark sessssse 128 H SOMSOMS A E A E E 130 GEL POSON iiie rone enira nn ER 130 hV IEecM M 132 Machine Information sssssssssseeeeeeneene 132 Rotor Weight Diameter and Speed 132 Reference Mark
22. Route Once you have taken the first recording the instrument will continue to guide you through the remaining route entries You can take recordings sequentially as they appear in the route list or change the order as you go by skipping individual route entries or machines This is particularly useful if a machine is temporarily off limits as it 96 Section 9 Using Routes we allows you to continue taking measurements and return to the machine at a later time If a location contains several route entries that don t require a change of sensor the recordings can be taken automatically one after the other to do this move the selection bar over a location so that it is highlighted If an individual route entry is highlighted the instrument will only collect that route entry then will pause waiting for input from you If you need to change sensors a message will display informing you which sensor or tachometer to connect From the Main Menu press E Route then use E and to scroll the list and highlight a route To see which machines are listed on your highlighted route use the right hand arrow keys to expand and collapse the machine list Press to select the highlighted route The screen displays the machines and locations and the highlight bar indicates where the route will begin Beside each location is a number indicating how many route entries are due to be recorded To see the route entries attached to each location use th
23. Suggestion D Weight K Added f ba fl e Replace safety covers start the machine again and let the rotor settle to its normal operating speed e Press to take a reading of the imbalance with the trial weight added After a few seconds the instrument displays the speed of the rotor in RPM and Hz the vibration level with the trial weight added Trial Reading Plane A L thase Angle a 1535 RPM 25 6 Hz r CH1 336 67 Section 11 Balancing Rotors vb7 and vb8 Instruments Only 137 RaM e Wait for the readings to stabilize then press If the trial weight was not of sufficient mass to affect the imbalance the instrument will display a warning prompt You can redo the trial reading several times if required or continue with balancing is Phase Angle WARNING Initial vs Trial A Trial weight had insufficient effect on machine vibration Recommend at least 3096 amplitude change or 30 phase difference n Largest effect was 6 62 on CH1 1 Y Continue Anyway rf X Redo Trial A e The instrument then displays the prompt Will the Trial Weight be removed now Press the appropriate key You can redo the trial reading several times if required or continue with balancing Here we have added trial weights twice more to obtain a new trial reading 5101 RPM 85 0 Hz r CH1 329
24. Timeout page 151 Section 13 Utilities 149 b e From the Main Menu press o Options e Press n LCD Contrast Backlight e Use the E and Ed A to adjust the backlight brightness or turn it off then press Recharging the Instrument e Plug the power transformer into a standard power outlet and attach the connector to the instrument s charger socket You can continue to use the instrument while the battery is charging Estimating Remaining Operating Time The instrument can estimate its operating time based on the amount of current remaining in the battery and the average current usage The true operating time before the battery runs flat will depend on how you use the instrument You can check the estimated operating time in the Battery and Power Management Menu e From the Main Menu press e Options e Press EI Battery Pwr Mngmnt The estimated operating Time Left is displayed in the middle of this screen Conserving Battery Power The length of time you can operate the instrument will depend on how it is used and what settings you apply You can adjust the following settings to reduce your power consumption and increase the instrument s operating time e Sound volume Screen brightness contrast Backlight brightness and timeout period Sleep Mode timeout Shutdown timeout 150 Section 13 Utilities we S Setting Backlight Timeout The backlight will turn off automatically after the timeout period has elapsed 6
25. bottom panel of the instrument e Set aside the battery cover and extract the battery Battery Cover Warning Do not detach the battery pack from the instrument for more than 10 minutes as this will cause the date time to be lost However all data will be retained Replacement batteries part number BATT0206 are available from authorized Commtest Instruments distributors Warnings Power should not be supplied to the instrument when removing the battery Unplug any connected power adapters before proceeding Damaged batteries should not be re inserted into the instrument Dispose of damaged batteries responsibly Section 1 Introduction 13 b Operating Overview You can use the instrument to perform the following tasks Take live free run measurements for onsite analysis of vibration spectra and waveforms Record routes and store vibration data for transfer to a PC offsite analysis Use keypad entry to enter additional machine information and process inputs Balance machines using single and dual plane methods vb7 and vb8 instrument models only Onsite Analysis You can measure vibration spectra and waveforms and analyze these onsite This is suitable for one off investigations Set measurement parameters on the instrument Domain frequency Spectral lines 1600 Fmax 1000Hz etc Measure and analyze the spectrum or waveform g9 Record the data to memory optional Section 1 In
26. can be balanced in one plane or two planes i e any uneven mass distribution in the rotor can be corrected by adding removing weights to from one or two selected cross sectional planes on the rotor For single plane balancing the mid plane of the rotor is usually used as the balancing plane For dual plane balancing usually the planes at the extreme ends of the rotor are used however other planes on the rotor can be used also Since the effect of a rotating weight i e the centrifugal force increases with the radial distance of the weight it is common to add weight to or remove weight from the rim of the rotor rather than a Section 11 Balancing Rotors vb7 and vb8 Instruments Only 123 b position close to the centre of rotation Making weight adjustments at the largest possible radial distance minimizes the amount of weight that needs to be added to or removed from the rotor The centrifugal force of a heavy spot on the rotor that causes the rotor to vibrate increases with the square of the rotational speed The vibration level of the rotor may be acceptable at one speed but not at another Therefore it is important to always allow the rotor to settle to its normal operating speed before taking balancing analysis measurements Whether a rotor should be balanced in one plane or two planes depends on the dimensions and operating speed of the rotor The following guideline is commonly used Rotor Length to Operating Speed
27. collect recordings by jumping to a different position in the route This allows you to skip individual route entries locations or entire machines This is particularly useful if a machine on your route is temporarily off limits but will be available for recording later that day The instrument pauses after each location s parameter sets have been recorded so that you can continue to follow the route as it has been defined or manually choose the next route entry Whenever you skip to a different position in the route the instrument will continue the route from that point forward To skip individual entries or entire machines you simply move the highlight bar to the next position where you want to begin recording e To skip an item use the left hand arrow keys to move the selection bar up and down and press repeatedly to expand out a machine so that its locations and route entries become visible Section 9 Using Routes 101 e Press to begin recording again at the highlighted position Locating Skipped Route Entries You can locate and record any skipped route entries at any time during your route e With your route displayed press then to display the hint labels e Press ie Prev Free Recording or Next Free Recording to jump to the previous or next unrecorded parameter set then continue recording as normal by pressing v Tracking Your Progress Through a Route As you progress through a route the scr
28. copied From the Main Menu press EJ Review Record If no machines are displayed press to make them visible Use the left hand arrow keys to select a machine To make the points and other lower level items visible press repeatedly Highlight the item you wish to copy then press then EX Copy 114 Section 10 Creating Editing and Deleting Items we S e Use the on screen arrows to choose where your copied item will be pasted then press o Paste Renaming Machine Structures Caution The Ascent software identifies machines structures and sensors by their names If you rename an item in the instrument the Ascent software will treat this as a new item when data is transferred Note The default locations horizontal vertical etc cannot be renamed If you want to rename a location from horizontal to vertical say simply create a new vertical location on a point and copy any required parameter sets from the horizontal location then delete the horizontal location e From the Main Menu press EI Record Review e f no machines are displayed press repeatedly to make them visible e Use the left hand arrow keys to select a machine To make the points and other lower level items visible press repeatedly e Select the item you wish to rename then press 5 Edit Name e Edit the name as required then press Deleting Machine Structures Note Any parameter sets used by a deleted machine will not be removed but will rema
29. duration of the waveform Number of Samples The resolution of the waveform increases with the number of samples used i e the more samples the more information the waveform contains However the more samples in a waveform the more memory is used up to store the waveform Tip An easy way to select the number of samples and duration is to let the instrument set them for you Set the Equivalent Fmax so that it covers your required frequency range the instrument will select the maximum number of samples and duration that can be used with this Fmax You can then adjust these values as required Duration The Duration of a waveform is its recording time The duration value depends on the number of samples selected increasing the number of samples increases the duration 62 Section 5 Setting Measurement Options we S Other Measurement Parameters Bandwidth available with Demod Spectrum the bandwidth you select determines which range of frequencies the demodulation process will use Refer to the topics on demodulation for more information Machine speed available with Cross Channel Phase when measuring cross channel phase you need to specify which frequency you are investigating this is typically the machine running speed Section 5 Setting Measurement Options 63 b Section 6 Measurement Types and Their Uses This section describes how to setup and take different measurements types You will learn e How
30. e Press E Tach then press o Tach Type and toggle this setting to Standard if using the Commtest supplied tachometer The screen will display the rotor running speed in RPM and Hz These values will continuously update but should stabilize indicating that the tachometer is triggering reliably If the RPM does not stabilize adjust the position of the tachometer Tachometer Reading Tach Vibration 1860 RPM 31 0 Hz Standard Tachometer Signal from a Keyphasor Note Keyphasor tachometer sensors are not supported by the vb5 data collector If your machine has a proximity probe based tachometer sensor e g Keyphasor this can be used as the tach signal for your instrument The sensor should have a buffered front panel BNC output to ensure the instrument s measurements can t interfere with pre existing speed measurements Keyphasor LEMO connector tach cables can be purchased through your local Commtest reseller for this purpose The Keyphasor proximity sensor gap should be adjusted so the driver box output is 8 V 2 V i e 6 V to 10 V when the sensor is over the shaft This is the normal mid range position for these sensors When the sensor is over the keyway its output will be 14 V to 22 V depending on its make and model 36 Section 3 Using Sensors we S Using a Strobe If you have a strobe light with an output signal it should be possible to connect it to the tachometer input of the inst
31. fields near the magnetic mounting bases e g cardiac pacemakers credit cards floppy disks video tapes audio cassette tapes mechanical watches Do not operate the instrument in an explosive environment Do not detach the battery pack from the instrument for more than 10 minutes This will cause the instrument s date time to be lost The instrument will retain all recordings and other information Neck straps must be connected to the instrument via the 2 5 turn stainless steel rings provided The strap must not be connected directly to the unit as this will defeat the 10 kg safety release provided by the rings Replacement rings are available from Commtest Section 1 Introduction 5 Mz nS ho Drive current ICP type vi Location C Orientation Firmly Attached N a b c vb Use only an approved power adapter 12 V 3 A output center positive Do not use the plug pack transformers supplied with previous Commtest instrument versions such as the vb1000 3000 and Profiler as these transformers will be damaged The cover over the comms and charger connectors provides an essential seal It must be in place whenever using the instrument in an industrial environment Transfer information stored in the instrument to a PC before reprogramming PROFLASHING the instrument with new firmware PROFLASHING the instrument will delete all stored information Ensure that the drive current is turned o
32. highlight the location The recordings will be taken one after the other in the sequence that they appear in the instrument 6 To start the first recording press The instrument and sensor will take a short time to settle before recording begins When the recordings are finished the instrument stores them to the correct measurement location and returns you to the Record Review Menu To take additional recordings select another parameter set or select a location to record all parameter sets under that location and repeat this process from step 5 Taking Individual and Multiple Recordings You can choose to record all parameter sets at a location or select the parameter sets individually This allows you to selectively record data or speed up data collection by reducing the number of key presses needed to take multiple recordings at a single location 86 Section 7 Taking Recordings Offsite Analysis we S e To record an individual parameter set highlight it and press Ml to begin recording e To record every parameter set under a location highlight the location and press to begin recording Saving Recordings When you are in the Record Review Menu you have several options for saving your recordings Auto Save The instrument momentarily displays the recorded information on screen before returning you to the Record Review Menu Record Review The instrument pauses after each recording so that you can review it on sc
33. in the USB area Click Apply to save the change Setting the Ethernet Network Address e From the instrument s Main Menu press in Options then Network e Press 2 Ethernet A message will appear asking if you wish to use a DHCP server to assign an IP address to the instrument 156 Section 14 Troubleshooting we S gt Press to use DHCP then press 9 E to reset and apply your changes or Press E and enter your new network IP values manually Press 3 to reset the instrument hardware and apply your changes Note Dynamic Host Configuration Protocol DHCP is a network protocol that automatically configures TCP IP networked devices Ethernet Connection Lost in Windows Vista Computers using the Microsoft Vista Ultimate operating system may lose Ethernet communications with vbSeries instruments following communication via USB This is the result of a network protocol incompatibility To resolve this problem disable support for the IPv6 network protocol in Vista e Navigate to Start gt Control Panel gt View network status this is located under the Network and Internet heading e Click Manage network connections on the left hand menu e Right click the Local Area Connection X icon the correct icon can be identified by the sub heading vbX X where X is the USB port number and select Properties e Under the heading This connection uses the followng items deselect the checkbox beside Internet Protocol
34. or axis e g use channel 1 to collect all recordings taken on the horizontal axis and channel 2 for vertical 98 Section 9 Using Routes vb e Select the route you wish to record then on the route screen press E to display the Multi Channel On Route Menu Multi Channel On Route SEREEN All Oth other axes none Mr Axis ori Record All TE _ Bugs CH Triax X on CH Record All other axes on CH3 Record All Bug Triax Z on CHA Cancel Multi Chan e Press E Axis Point Mode to choose whether to operate in Multi Axis or Multi Point mode see below Axis Mode Axis on CH3 Triax Y Axis Point Mode Use this mode to record two axes simultaneously Horizontal and Vertical for example e Specify a channel and axis combination Press E Axis on CH1 or press for CH2 and so on and use the arrow keys to select an axis Once selected you must only use this channel when taking recordings on your chosen axis for the duration of this route Press to confirm Section 9 Using Routes 99 Select Axis Name Horizontal Point Mode Use this mode to record two points simultaneously Inboard and Outboard for example Typically this will be used when there is only one axis defined at each point horizontal on each machine bearing for example If there is more than one axis defined at one or more of the points then the instrument will require that all axes be the sam
35. press Press twice to select the new bias check configuration The sensor will now use the new or edited bias values Setting a Default Sensor When you specify a particular sensor as being the default and enabled its measuring channel the instrument will assume that you are using this sensor to take all further measurements If you wish to change sensors you can do this in the measurement setup screen select the type of measurement you wish to take and press then to temporarily switch to using a different sensor To alter the default sensor follow the steps below From the Main Menu press o Options Press E Sensor Setup then press Change Sensor opposite your chosen measuring channel Press Select as Default to select which sensor to use for schedule entries which are sent from Ascent with Selected Sensor set to Use instrument s default sensor Deleting Sensors From the Main Menu press o Options Press 5 Sensor Setup then press Change Sensor opposite your chosen measuring channel Use the left hand arrows keys to highlight your sensor then press E Delete Sensor Section 10 Creating Editing and Deleting Items 119 b Working with Notes Creating Notes You can create and store notes up to 50 characters in length on the instrument These can be attached to any part of a machine structure or route item but not schedule entries and are transferred with your collected data when recordings are sent to
36. s LED lights will also indicate the status of the recording relative to the baseline RED YELLOW 200 150 Baseline Level 5096 25 0 90 Section 7 Taking Recordings Offsite Analysis we S Note You can only display baseline recordings when taking a recording from the Record Review Menu or from the Route Menu You cannot display a baseline using the Measure Menu Baseline recordings are identified by an arrow gt to the left of the recording list Section 7 Taking Recordings Offsite Analysis 91 Section 8 Sending and Receiving Information This section describes how to transfer information between your instrument and the Ascent software You will learn to e Transfer information to and from the instrument e Synchronize the instrument s timezone with the computer that receives the recordings e Change the instrument and software network address Transferring Recordings to the Ascent Program e f you are using the Commtest supplied data transfer cable connect this to the USB ports of the instrument and computer Note Before communication between the instrument and the Ascent software can begin the instrument must be added to the Ascent software See the Ascent Software Reference Guide for details e Power up the instrument and click the Ascent Receive button to establish communication between the software and instrument Check that the Comms Method in the upper left of the window
37. spaced vibration frequencies or when the Fmax is very large For coast down or run up measurements we recommend a resolution of 400 lines Fmin The purpose of the Fmin setting is to eliminate the ski slope effect from the low frequency end of the spectra All spectral lines below the Fmin value will be set to zero and will not be included in the overall RMS calculation Section 5 Setting Measurement Options 59 ee Tach Trigger When you select Tach Trigger measuring begins only when a tachometer pulse is detected If Tach Trigger is set to OFF the instrument will begin measuring as soon as the settling time has elapsed Averaging When measuring vibration several spectra are usually measured and averaged to produce an average vibration chart The averaging process minimizes the effect of random variations or noise spikes that are inherent in vibration signals Averaging is applied to amplitude values not to the frequency range e From your chosen measurement setup menu press ilsi to display the various averaging options Number of Averages The larger the number of spectra used for averaging the more any noise spikes in vibration signals are reduced and the more accurately true spectral peaks are represented However the larger the number of averages the more data needs to be collected and therefore the longer it takes to obtain the average spectrum Four averages are sufficient for most cases Set the number of av
38. such as misalignment which can show up at 1X RPM similar to imbalance Knowledge of the phase relationships of various machine faults will help to confirm the existence of a specific machine fault and help to prevent misdiagnosis Cross channel phase is a convenient method of taking phase measurements that does not require the use of a tachometer or reflective tape Instead phase is measured between two sensors Note When taking measurements be aware of the direction each sensor is facing If you are measuring across the coupling in the axial direction you will probably turn the sensors in opposite directions thereby introducing an additional 180 phase change Remember to take this into consideration when analyzing the phase measurements Recommendations for cross channel phase 1 Determine the exact frequency of interest by using spectra to identify high amplitude peaks at specific frequencies 74 Section 6 Measurement Types and Their Uses we S 2 Position the channel 1 sensor in a location which has high vibration at this frequency Do not move this sensor once testing has started 3 Try out different locations with the channel 2 sensor noting the phase and amplitude relationships compared to the fixed channel 1 position 4 Repeat steps 2 and 3 at any other locations of interest Fault Types and their Phase Relationships Misalignment High amplitude peaks will appear at 1X 2X and sometimes 3X the running spee
39. the instrument e g if you plan to resell the instrument Transfer any information you wish to save to the Ascent software before emptying the database Warning Emptying the database removes all information stored in the instrument You will lose all machines routes parameter sets and notes Only the factory default settings such as axis names parameter sets and notes will remain e From the Main Menu press Folders then E Empty Database e Press twice to confirm 122 Section 10 Creating Editing and Deleting Items we S Section 11 Balancing Rotors vb7 and vb8 Instruments Only This section describes the procedure for performing balancing operations with your instrument Note The vb5 and vb6 instruments do not include balancing functionality This section applies only to vb7 and vb8 instruments You will learn to e Understand the balancing process Select appropriate balancing settings Set up a balancing job Manually enter balancing values Use the instrument s suggested balance weight calculations Methods for Balancing Rotors The instrument can balance rotors that are rigid and which do not flex significantly at their operating speeds An imbalanced rotor is one that has an uneven mass distribution that causes the rotor to vibrate when it is rotated Balancing a rotor requires correcting the uneven mass distribution by adding or removing weight to from precisely calculated positions on the rotor A rigid rotor
40. this option e Press to select this option Measure Spectrum Waveform Bump Test Tach Time Sync Avg Jumping directly to the end of a list When there are a large number of options left and right arrows will display on either side of the screen Example e From the Main Menu press Measure A long key press on will return you to the Main Menu if you have another menu open e Select Spectrum Waveform by pressing Gi Section 2 Instrument Basics 21 vb e Press Spectrum Waveform Left and right facing arrows will appear on the right hand side of the screen indicating that you can jump to either end of this list e To jump to the last entry in the list press Press n to jump to the first list entry Spectral Lines amp Wim Buffer 400 lines 1024 samples hs S Spect pec Wfm Wim Scrolling through a multi column list Lengthy lists are displayed in multi column format You can jump across the columns as well as scrolling up down Example e Press to return to the Spectrum Menu then press 8 Fmax Fmin e To move to the next column in a multi column list press n o Md 22 Section 2 Instrument Basics vb Fmax Hz 1 Hz ao Spect Spec Wfm Wim Canceling an Option e To cancel an option press This will normally return you to the previous menu If you have opened several sub menus pressing this key will return you to the original menu A long pr
41. to use cursors and zooming e When you have finished reviewing the recording press twice to return to your route Retaking Recordings When retaking a recording you can either replace or keep the previous reading You can also select individual recordings to replace e f your route is not currently displayed do this now From the Main Menu press Route use the arrow keys to highlight your route and press e Highlight the machine containing your route recordings and press 7 repeatedly to expand the machine so that the locations and parameter sets display e To retake all recordings at a location highlight the location To retake an individual recording highlight its parameter set Section 9 Using Routes 105 r x e Press You will be prompted to keep or replace recordings or cancel this action Press to replace your earlier recordings Deleting a Route Recording e f your route is not currently displayed do this now From the Main Menu press Route use the arrow keys to highlight your route then press e Use the arrow keys to highlight the machine containing the recording and press 7 repeatedly to expand the machine so that the parameter sets display e Highlight the parameter set you recorded earlier and press Review Recordings e f there is more than one recording in the list highlight your route recording identified by its date timestamp then press to delete it e Press to return to your route Tak
42. to take different types of measurements e The uses of different measurement types Spectrum A vibration spectrum is a chart of vibration amplitude versus vibration frequency The vibration spectrum of a machine component shows the frequencies at which the component is vibrating and the amplitude of vibration at each of these frequencies Spectra consist of discrete spectral lines displayed at fixed frequency intervals The height of each spectral line represents the amplitude of vibration at that frequency The more spectral lines in a spectrum the higher the resolution of the spectrum but more memory is used Amplitude Vibration is occurring at l a frequency F1 with fT ess gu an amplitude of 41 Spectral Lines Frequency A simplified illustration of a discrete vibration spectrum The key parameters you need to set are the number of spectral lines and the Fmax to ensure that all crucial information is captured 64 Section 6 Measurement Types and Their Uses we S e From the Main Menu press ize Measure then press 5 Spectrum Waveform e Use the left hand arrow keys to select a parameter set or create a new one by pressing parameters as required and setting the e Press to begin measuring Waveform Waveforms show how vibration levels change with time A vibration waveform chart represents a series of equally spaced discrete sample points connected by straight lines The chart shows the vibratio
43. use these options when performing a balancing job Balance Planes and Weight Positions Use these options to set the type of balance job single or dual plane and specify a weight position reference system i e where on the rotor you will place the balance weights in relation to a reference mark Balance Planes e From the Balance Setup Menu press E then use the arrow keys to highlight the number of balance planes to use e Press to select This will display the Balance Weight Setup Menu Weight Position Reference Mark Performing balancing operations on a rotor requires you to establish a positioning system for balance weights To do this you must first establish a reference mark somewhere on the rotor circumference then choose the weight positioning system that is most appropriate for your balance job Degrees Measure the angle in degrees 0 to 359 from your reference mark The radius of the rotor must stay constant 128 Section 11 Balancing Rotors vb7 and vb8 Instruments Only we S Circumference arc Measure the linear distance around the outside of the rotor from the reference mark to the balance weights Fixed positions Create a fixed number of attachment positions e g drilled and tapped holes that are equally spaced on a fixed radius from the center of rotation To assist with the physical balancing setup you can use a different weight position system for each balancing plane if desired From the
44. used to generate a spectrum but is first modified using a Window function The purpose of windowing is to compensate for certain FFT algorithm limitations that cause signal leakage Windowing involves multiplying blocks of data values by a suitable mathematical function window type to ensure that the data block begins and ends with zero amplitude This makes the data block appear like a complete wave Choosing a window type You can choose Hanning or Rectangular no window Each type of window has characteristics that make it better suited for some applications and less well suited for others The following table is a general guide only you should match the window type to the nature of the signal you are trying to capture such as random or transient signals etc Section 5 Setting Measurement Options 61 ee x Window Type Purpose Hanning window Provides the best frequency resolution The Hanning window is a good general purpose window Rectangular The FFT is not adjusted i e this is equivalent to not using a window Explaining Waveform Parameters Equivalent Fmax This allows you to control the waveform sampling rate by expressing it in terms of the maximum frequency of interest For example if you want a waveform with frequency content Equivalent Fmax up to 1 kHz the instrument will automatically sample at 2 56 kHz Changing the Eq Fmax directly affects the sampling rate so it has an inverse effect on the
45. 0 seconds by default If a measuring period exceeds the backlight timeout the backlight will remain on during measuring and will turn off when measuring is complete e From the Main Menu press o Options e Press 9 Battery Pwr Mngmnt e Press EI Turn Off Backlight Enter a value in seconds minimum 1 maximum 9999 then press Setting Sleep Mode Timeout Sleep mode turns the instrument off if no keys are pressed for a set period of time 15 minutes by default This method of auto powering off the instrument conserves battery charge and allows for fast powering up approximately 7 seconds However it is less battery efficient than using the Complete Powerdown option because the internal module remains on The instrument will power down completely once the complete powerdown timeout period has elapsed see next topic When recording a route powering up the instrument from sleep mode will return you to the last displayed menu In all other cases the instrument will display the Main Menu e From the Main Menu press o Options e Press Ed Battery Pwr Mngmnt e Press Enter Sleep Mode and enter a value in minutes minimum 1 maximum 9999 then press v Powering up the instrument e To power up the instrument from sleep mode press 9 Power as normal Section 13 Utilities 151 eh Note If the battery level drops to 25 or less sleep mode is disabled The instrument will immediately enter Complete Powerdown Mode when
46. 12 138 Section 11 Balancing Rotors vb7 and vb8 Instruments Only we S T Perform the same procedure for Plane B attach a trial weight enter its position and specify whether weight is being added or drilled out If you are removing trial weights the Plane A trial weight must be removed before performing the Plane B trial reading Reviewing Previous Balancing Jobs From the Main Menu press E Balance then Ed Select Machine Use the left hand arrow keys to highlight a machine All balancing jobs associated with that machine will display in the right hand Recordings column Press the right hand arrow key select the Recordings column a black border will appear around it indicating that you can now browse through the recordings The newest balance job is highlighted at the top of the column Press to display the selected recording or use the left hand up down arrow keys to select another In the Balancing Menu press 2 View and Save to see the Balancing Report Section 11 Balancing Rotors vb7 and vb8 Instruments Only 139 b Section 12 Balancing Walk through vb7 and vb8 Instruments Only Note The vb5 and vb6 instruments do not include balancing functionality This section applies only to vb7 and vb8 instruments This walk through guides you through the process of balancing a rotor using single and dual plane balancing Dual plane balancing requires additional steps these extra
47. 2 Charger power socket 12 Volt 3 Amp input This may be used to power the instrument and or to charge the instrument s battery pack 3 USB socket Provides a data connection between the instrument and the Ascent host computer 4 BNC sensor input Channel 1 5 BNC sensor input Channel 2 OR LEMO seven pin input Channels 2 to 4 6 LEMO four pin tachometer input This feature is only available on vb6 and vb8 instrument models Note The comms and charger area s protective rubber gasket should be kept closed and in place when collecting data in the field Doing so will help maintain the environmental sealing of the instrument case Section 1 Introduction 9 en v Front Panel Buttons gt 5 Instrument Front Panel Turn the instrument On Off Cancel Go Back A long press takes you back to the Main Menu Accept Go forward to the next menu Activate alternate functions for each key In some menus the keys can perform several functions to see what options are available press ALT to toggle the key functions Help key expand on screen icons with easy to see hint labels A long press displays detailed help text Navigate up down through a list To move more rapidly through a list press and hold Navigate left right Also expands and collapses levels in the navigator and directs movement between split screen menus e g the Record Review Menu 10 Section 1 Introduction vb po LED Indicators Fi
48. 6 Editing or Deleting a Route sseeeeeeeeee 107 Section 10 Creating Editing and Deleting Items 108 Storage Capacity and Recording Volume 108 How are Recordings Organized and Stored 108 Working with Folders siepe Rau Eo bU pa puxtutu SE drUPErtpxtextu SEE 110 Creating a Folder 110 Renaming a Folder xni ehe 110 Deleting a Foldet ette etre Rees 110 Restoring a Deleted or Over Written Folder 110 Working with Machines operta eani npcEEE 111 Creating Machine Structures sessseesseese 112 vi we S Creating Parameter Sets ccccccccceceeeeeeeeeeeeeeeeseteeesseeetens 112 Adding Structures to Existing Machines 114 Copying Machine Structures ccccceseceeeeeeeeeteeeteneeeeeeeeeees 114 Renaming Machine Structures sss 115 Deleting Machine Structures ssssssesss 115 Working with Sensors 224s 2ccanes Bienes Rat ati deetu sa e ooe ua Sephsi ated 116 Defining and Editing Sensors ssssssssssss 116 Using the Bias Voltage Check ssssesesss 118 Setting a Default Sensor ssssssssseeeeeees 119 Deleting Setnsots ioe ieri t prier te entes 119 Working with Notes uoce Ito e naue pedes epe r rupes cS EUUSUC 120 Creating Notes iet eme rre e En Ras 120 FANNO
49. 9 Power is pressed or at the completion of the Sleep Mode Timeout period Setting Complete Powerdown Timeout Complete powerdown turns the instrument off after a set period of time 1 hour by default in Sleep Mode e From the Main Menu press o Options e Press 9 Battery Pwr Mngmnt e Press E Complete Powerdown and enter a value in hours minimum 1 maximum 9999 then press Checking How Much Memory is Available The Memory Menu displays information on the instrument s memory capacity the amount of memory in use and the number of folders schedule entries and recordings stored in the instrument e From the Main Menu press o Options e Press Memory to display the instrument s memory usage Press to return to the Options Menu Freeing Instrument Memory The instrument has a standard memory size of 1 GB providing virtually unlimited storage capacity for routes recordings and notes etc To increase free memory we recommend you regularly transfer recordings to a PC and delete those that are not required The easiest way to do this is to re send the folder from the Ascent 152 Section 13 Utilities we S software Refer to the appropriate topics in Creating Editing and Deleting Items page 108 Upgrading Instrument Firmware Proflashing From time to time Commtest will release new versions of instrument firmware These firmware upgrades allow you to take advantage of product enhancements and new features that w
50. L LCD screen 147 149 Linear averaging 60 168 Index we S Log range 47 Machines defining working with 111 Measurements measurements analyzing 42 saving 51 taking 38 39 Memory capacity 108 152 available amount 152 deleting all information 122 freeing up 152 use of 59 62 N Notes 120 O Off route recordings 106 Orders 50 Overall power level 53 90 Overlap percentage 61 P Parameter sets defining working with 55 56 Peak hold averaging 60 Phase angles 70 74 75 76 PROFLASH firmware upgrading 153 R Recordings deleting 89 122 multi channel 82 83 reviewing 88 saving 87 taking 85 Report balancing 139 145 Resetting the instrument 155 Resolution 59 62 Revs waveforms 51 Routes working with 96 off route recordings 106 skipping route entries 101 RPM setting 49 rpm displaying 70 S Sensors bias voltage 118 connecting 31 mounting 32 33 sensitivity 30 supported types 30 Index 169 b Settling time 116 Spectral lines 59 Strobe using 37 T Tachometer 34 70 triggering 60 Time synchronous averaging 71 Trial reading 124 135 Trim balance 124 143 U Upgrading the instrument 153 V vaB 48 scaling 47 48 units 47 48 W Windowing 61 WR with rotation 133 170 Index
51. Log dB repeatedly to toggle between Linear Log and dB scaling vdB and adB scaling are only available when measuring velocity and acceleration respectively e Press Ed Y Axis Max This is the highest amplitude value that will be displayed on screen Use the arrow keys to highlight a value then press to select e Press 2 Y Axis Range repeatedly to toggle the Y Axis range This selects the lowest amplitude value that will be displayed on screen relative to your chosen Max Value e When you have finished press to return to the measurement screen Fixed Y Axis scale options Setting a Max dB Value sets the highest value that the amplitude axis can display so if a peak goes above this value while you are measuring you will not see the top of the peak When using Linear scaling you have two extra display options Automatic This allows the instrument to auto scale the left axis to accommodate the highest and lowest peaks Current This fixes the Y axis to whatever amplitude is currently displaying regardless of how large or small the peaks become Amplitude Display Units Your chosen Store Units acceleration velocity etc determine which amplitude scaling options are available The vdB scale is only available if you are taking velocity measurements and adB is only available if you are taking acceleration measurements Linear and Log scaling are available for all measurement types Choose from the following amplitude display units
52. M 16 89 Hz CH1 181 40 2 1 The instrument will perform a spectral peak search on channel 1 at the entered frequency The frequency of the actual peak displays at the top left of the screen in Hz The instrument then looks at exactly the same frequency on channel 2 and displays the phase difference Delta value CH2 CH1 The instrument also displays the phase angles and amplitudes of both channels at your chosen peak frequency Section 6 Measurement Types and Their Uses 77 R Long Time Waveforms Explained Long time waveforms allow you to take a continuous recording over a very long time period many hours if required making it particularly useful for capturing transients Once measuring has begun recordings are taken continuously until your specified time period has elapsed or you manually stop the measurement The amount of time you can record for depends on the Equivalent Fmax which determines the sample rate lines of resolution and how much available memory is left in the instrument Measuring Long Time Waveforms Note This feature is not available on the vb5 or vb6 instrument models Duration is the total amount of time available for recording and is displayed in seconds You can record for the full length of time available or set a shorter time period Your chosen time period is shown on top while the available time is shown in brackets below this value T
53. Press E Save This opens the Select Location to Save Menu Section 6 Measurement Types and Their Uses 83 vb Select Locations Machine fl med CH1 SpectWfm 1000Hz Point Md Spect Wfm Horizontal 0 CH2 SpectWfm 1000Hz Macine Save Mil Spect Wim Vertical SOA Machine WM CH3 SpectWfm 1000Hz Poi Save ui Spect Wim aint t pect Axial BIS CH4 SpectWfm 1000Hz Machine KVA Point aj Spect Wfm Vertical 2 MESES 3 You can save each channel s measurements or select only those that you wish to keep Press the right hand Save to key opposite the channel you wish to save 4 Use the arrow keys to select a location to save the measurement or press if you need to create a new location See Storing Measurements on page 51 for more information 5 Press to return to the Select Locations Menu Repeat this process from step 3 to store your other measurement s If you change your mind after saving a measurement press the channel s right hand Save key again the text will change to Don t Save 6 When you have selected all the measurements you want to save press ME The instrument will display Data Saved before returning to the measurement screen 84 Section 6 Measurement Types and Their Uses we S Section 7 Taking Recordings Offsite Analysis This section describes how to take recordings with your instrument You will learn to e Take recordings e Review and delete recordings e Attach note
54. S e Attach or remove the recommended correction weight as indicated by the instrument then proceed to Trim Balance j For dual plane balancing two sets of values will display Step 5 Perform Trim Balancing e Replace safety covers start the machine again and let the rotor settle to its normal operating speed e Press to take a trim reading After a few seconds the instrument displays the vibration level with the imbalance corrected Trim Reading 4839 RPM 80 6 Hz r CH1 311 02 Section 12 Balancing Walk through vb7 and vb8 Instruments Only 143 b Press to accept this measurement The instrument will now display the details of additional weight adjustments required to trim balance the rotor i e to further reduce the level of vibration imbalance You can end balancing at this point or continue with another reposition of trim balance weights as indicated to improve on the balance level Repeat trim balancing until you are satisfied with the results Plane A Last Ri 51 49 277 WR leading Trim A Weight Calculated Wieight cem X jtation PER Are LL aN V wf fv Ae N X TY TEEN ce d is PRAT VERA ANC SARA ALX ATEX 144 Section 12 Balancing Walk through vb7 and vb8 Instruments Only we Step 6 Viewing and Saving Balancing Jobs e This step is optional To view the Balancing Report Menu press The screen displays the result
55. Sensors 33 ee e Keep the accelerometer clear from other cables ensuring it is not twisted kinked or tangled Permanent Mounting To mount using the stud method prepare a mounting spot on the machine following the specifications shown in the diagram below e Unscrew the magnetic base from the sensor and screw onto the threaded stud We recommend you use a thread locking compound A Surface B Threaded Stud Minimum Zi 1 4 28 UNF thread 0 63 16 mm Max height Surface to be flat 0 236 6 0 mm and smooth 1 A 0 001 0 02 mm Stud Mounting Spot Caution Do not use a wrench to tighten the accelerometer as this may damage the sensor Setting up the Tachometer A tachometer collects information on a machine s rotation speed providing you with an exact reading of machine speed as a measurement is taken This is more accurate than using a default RPM as a machine s speed can vary significantly under different loads The tachometer also provides information on the angle at which the rotor is vibrating The angle is measured from a fixed reference mark on the rotor and is called the phase angle To balance a rotor it is necessary to consider not just the amplitude of vibration but also the phase angle The amplitude shows the severity of the imbalance and the phase angle indicates the geometry of the imbalance Warning The laser tachometer is a class 2 laser product Do not stare into the laser beam 34 Sect
56. VDSeries Instrument Reference Guide vb5 vb6 vb7 and vb8 Data Collectors and Analyzers Revision May 19 2008 COPYRIGHT 2008 Commtest Instruments Ltd All rights reserved No part of this document may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopy recording or otherwise without the prior written permission of Commtest Instruments Ltd For information contact Commtest Instruments Ltd 28B Moorhouse Avenue Christchurch New Zealand E mail help commtest com Printed in New Zealand Disclaimer The information provided in this document is subject to change without notice Names and data used in examples are fictitious unless otherwise noted This document is distributed as is without warranty of any kind either expressed or implied respecting the contents of this document including but not limited to implied warranties for the document s quality performance merchantability or fitness for any particular purpose Neither Commtest Instruments Ltd nor its employees dealers agents or distributors shall be liable to the user of this document or any other person or entity with respect to any liability loss or damage caused or alleged to be caused directly or indirectly by this document Trademark Notice vb M vb1000v M vb1000 vb2000 vb3000 vb5 vb6 vb7 vb8 vbBalancer vbBalancer 6Pack vb
57. Version 6 TCP IPv6 e Click OK Note Disabling IPv6 will prevent you from using Windows Meeting Space or any application that relies on the Windows Peer to Peer Networking platform or the Teredo transition technology If you wish to use these applications simply re enable IPv6 support Ethernet instrument connections will be unaffected by the reactivation of IPv6 Section 14 Troubleshooting 157 m x support as the compatibility problem is resolved by the initial performance of the procedure above 158 Section 14 Troubleshooting we S Appendix Specifications vb5 Specifications Model vb5 Remarks Sensors Sensor input Sensor AC coupled range DC coupled ranges Connectors Analog to digital conversion Sensor excitation current Sensor detection 1 channel Accelerometer 16 V peak peak 0 V to 20 V 10 V to 10 V 20 V to 0 V 1x BNC CH1 24 bit ADC 0 mA or 2 2 mA configurable 24 V maximum Warns if short circuit or not connected Allows for 8 V sensor output swing 80 g e g for reading prox probe gap Safety feature Break free inline connector 2 2 mA required for IEPE ICP type accelerometer Tachometer Sensor Laser sensor range Other Sensor types supported Power supply to sensor TTL Pulse rating Speed range Laser sensor optional 10 cm to 2 m nominal Contact TTL pulse 6 V to 8 V 50mA 3 5 V 4 mA min 28 V 5 mA max off state 0 8 V 10 RPM to 300 000 RPM 0 5 H
58. XManager and PROFLASH are trademarks of Commtest Instruments Ltd vbSeries Commtest vbOnline and Ascent are registered trademarks of Commtest Instruments Ltd Other trademarks and registered trademarks are the property of their respective owners we S Contents Section 1 Introduction uiuis nta centi nina aa panic Rund xA 1 Standard Features ise ente intr eoi tex Oa Reb lx asia iucuE 1 Standard Kit Items essssesssesesseeeeeeennene 2 Instrument CAD ADIOS gine eie opt te rne n Eee rti crnr ine 3 Precatti nS o ee ei eer eee eee esa tet tt 5 Hazardous EOGBlIOTIS iuo Dro ERU uta DM M RU DH D NM E 7 Instrument Connections esseeesseseeeeeeeeee 9 Front Panel Buttons secat ue prae ernannt abis utr rains 10 LED MGIC AIONS ce 11 Charging the Battery Pack eeeeseessssssse 12 Battery Features Mee rcd 12 Removing the Battery Pack eeseeeesssesss 13 Operating Overview eesesseseeeseeeeeeneeee nennen 14 Onsite AnalysiS cete e iib tit n ret Eco ei axe aca 14 Recording Routes uicit eet ep e cet ede 15 Balan CiiG E 15 Keypad Entry 0 eccceceesscceeeeeseceeeeeneeeeeeeaeeeseesaeeesessaeeeseesneeteneaes 16 Section 2 Instrument Basics 18 Powering On Off E 18 Navigating Menus eeseeseseeseeeeen
59. a machine A parameter set defines a list of measurement parameter values that are used to take a recording Because parameter sets are stored in the instrument they can be retrieved and reused which saves time when you are taking large numbers of identical recordings A location axis refers to the direction a sensor is facing when you place it on a machine e g horizontal vertical tangential etc Each machine point can have many locations because you can vary the direction location of the sensor with each new recording A point represents a position on a machine that a measurement will be taken e g the drive end or driven end A route is a sequential list of machine measurement locations that you follow when taking recordings A folder is used to group and identify machines For example if you collect vibration data from several factories you should use a different folder to hold each factory s machines Routes folders machines points and locations are identified by the names you give them Parameter sets are identified by their parameter value summaries e g accel 400 ms or veloc 1000 Hz Recordings are identified by their date time stamps Section 10 Creating Editing and Deleting Items 109 b Working with Folders Creating a Folder e From the Main Menu press twice e Enter a name for the folder then press The newly created folder will be highlighted Press again to select and you will be returned to the Main
60. all measurements on screen and compare them together and also toggle between the charts so that you can view them one at a time Viewing two waveforms simultaneously Analyzing Measurements To halt a measurement so that you can analyze it press The overall vibration value will display at the top right of the screen Press to display hint labels for analysis options such as zooming and displaying cursors 42 Section 4 Analyzing Measurements Onsite ia YAXIS to Cursor Expand kil Right Second Cursor X AXIS Expand Pressing displays analysis options Using Cursors Cursors are a valuable tool for analyzing your data You can use them to show the amplitude and frequency of a peak identify harmonics and show the frequency difference between two peaks Placing a cursor on the chart e Press or repeatedly to activate a cursor and move it across the screen To move the cursor rapidly from peak to peak within a displayed waveform recording press and hold the key Placing a second cursor on the chart e Press Second Cursor The second cursor will not be immediately visible as it will be placed directly behind the first cursor the new cursor s values will appear at the top right of the screen e Press Gi or repe
61. ameters you need to set are the duration number of samples and number of averages The duration determines the equivalent Fmax value If the waveform is later transferred to Ascent and displayed as a spectrum this Fmax value will be used on the chart The number of samples controls the number of spectral lines used when the waveform is transferred to Ascent and displayed as a spectrum We recommend you use 16 or more averages in order to remove non synchronous peaks from the final spectrum Section 6 Measurement Types and Their Uses 71 RaM Note You must use a tachometer or Keyphasor to trigger your measurements Connect the tachometer or Keyphasor that will be used to trigger your measurements From the Main Menu press Ead Measure then Gi Time Synch Avg Use the left hand arrow keys to select a parameter set or press to create a new one and set the parameters as required If you are creating a new parameter set select the number of samples duration and tach trigger source then press and to set the number of averages Press to begin measuring Bump Test Note This feature is not available on the vb5 or vb6 instrument models The bump test is a useful vibration analysis technique to help identify resonance frequencies in a machine s structure It requires bumping i e hitting the machine structure when the machine is stopped while taking a peak hold measurement Careful selection of the mallet or
62. and save individual recordings only when a machine required further investigation For instructions on manually saving a measurement see Saving Measurements on page 51 To select the appropriate recording save mode highlight your route in the Route Menu press to display it then press Recording Save Mode repeatedly to toggle the options Section 9 Using Routes 103 Boat Engine 11 51 45 Axial 1 0 am Single Chan Record Review Warn Save options shown at bottom right of screen Selecting Recordings to Review If your route is not currently displayed do this now From the Main Menu press Route use the arrow keys to highlight your route then press If necessary use the arrow keys to select a machine and press repeatedly to expand the machine so that the parameter sets display Highlight a parameter set and press Go Review Recordings If there is more than one recording listed highlight your route recording identified by its date time stamp and press If you collect the same measurement as an off route recording both this and the route recording will appear in the list 104 Section 9 Using Routes Select Recording 11 01 2008 11 06 11 e When your recording is displayed you can use cursors harmonics and zooming to better analyze the data Press dl to display hint labels and refer to the appropriate topics in Analyzing Measurements page 42 for details of how
63. ap 61 peak hold 60 time synchronous 71 B Balance weights 128 132 placing 133 Balancing against rotation 133 circumferance arc 128 degrees 128 fixed positions 128 initial reading 124 130 141 printing reports 148 reference mark 128 130 133 report 139 145 trial reading 124 135 trim balance 124 134 143 units 134 walk through 140 WR with rotation 133 Baseline recordings 90 Battery conserving power 150 features 12 recharging 12 removing 13 C Channels 46 Index 167 assigning sensors to 57 82 multi channel measuring 82 83 98 Charts 42 scaling 47 48 53 working with multiple charts 46 zooming 45 Zooming charts 45 Copying items 28 114 Crosss channel phase 76 Cursors 43 D Date and time 146 147 Deleting items 115 all stored information 122 folders 110 notes 121 recordings 89 106 122 restoring 110 routes 107 sensors 119 Delta 43 76 Demodulation 66 67 70 bandwidth 63 Drive current 5 116 E Exponential averaging 60 F Fixed positions 128 Fmax 58 59 equivalent Fmax 62 Fmin 59 Folders defining working with e 108 110 transferring to the software 92 H Harmonic cursors 43 Incompatible sensor 116 Initial reading 124 141 Instrument capabilities by model 3 Instrument I O ports 9 K Keypad entries 16 80 Keyphasor 36
64. arked as baseline in the Ascent software it will be transferred to the instrument when the folder is re sent If a different recording is marked as baseline in the instrument this will be replaced with the newly sent baseline Synchronizing the Timezone on the Instrument and PC The instrument s date and time may differ from that of the computer which receives the recordings particularly if you are sending recordings to a country in a different timezone You can synchronize the time clock of the instrument with a recipient computer by automatically updating the instrument s date time each time you transfer data using Send or Receive To use this feature the receiving computer must have Synchronize VB Date and Time with the PC turned on see the Ascent Software Reference Guide Synchronizing the Instrument Date Time with your PC e From the Main Menu press o twice e Press Cg Ascent Time Sync to toggle the setting The following options are available Auto Synchronize the date and time whenever data is transferred 94 Section 8 Sending and Receiving Information we S Off Do not synchronize the date and time i e the instrument will continue to use whatever date and time settings that you specify Manual Synchronize the date and time only if the timezone is different or the instrument timeclock differs from the computer by more than one minute e You will be prompted to update the instrument date time only when Manua
65. atedly to move the cursor to either side so that it becomes visible Toggling the active cursor e Press Second Cursor to toggle between the two cursors Section 4 Analyzing Measurements Onsite 43 b Clearing cursors e Press then I Clear Cursors to remove all cursors and harmonics Displaying the amplitude frequency of a peak e Press or Mi repeatedly to activate a cursor and move it across the screen The frequency and amplitude values indicated by the cursor will display at the top right of the screen Displaying the EJ or time difference between peaks e Press or it to the first peak repeatedly to activate a cursor and move e Press 8 Second Cursor to add a new cursor to the display and press n or repeatedly to move it to the second peak Both cursors values appear at the top right of the screen The delta symbol will appear on the far right of the screen The value beside the delta displays the frequency or time difference between the two peaks 6001 RPM 13 537m s 13 521m s 55 6 tpk f e 67 50Hz 132 S0Hz 65 00 AL The delta indicates the frequency amplitude difference of two peaks 13 537m s 13 521m s 55 6 tpk 67 50Hz 132 50Hz 65 00 44 Section 4 Analyzing Measurements Onsite we S Displaying harmonics Press then press nm Harmonics Sidebands Press or repeatedly to move the cursor over different peaks Additional cursors will display at frequency or time value
66. ck in a vehicle with a 12 V negative chassis power system e Connect the adapter s DC output to the instrument s charger power socket The instrument s Power supply and Charging LED indicators will illuminate indicating a charging state Notes A full battery charge will complete in approximately 3 hours The fast charge Lithium lon type battery pack should be charged for a minimum of 1 hour before or during its initial use Battery Features The instrument is powered by a rechargeable custom Lithium lon battery pack with a normal operating range of 6 5 V to 8 4 V The instrument is equipped with an internal backup component that protects data and settings in case the battery pack is momentarily removed from the instrument The backup component is kept charged by the battery pack if the battery pack is functioning normally The instrument has a number of inbuilt features which help ensure that the battery pack is always sufficiently charged 12 Section 1 Introduction vb Below 7 Volts the instrument automatically turns off the backlight to prevent further power draining and displays a flashing battery icon as a reminder to recharge the battery At 6 5 Volts the instrument automatically powers down to conserve power With a battery charge of 25 or less the instrument will enter Complete Powerdown Mode when powered off Removing the Battery Pack e Loosen the screws 2 x Phillips Head attaching the battery cover to the
67. cord Review Menu Changing the sensor To assign a different sensor press E Sensor Setup then press Change Sensor opposite your measuring channel and select a different sensor To define a new sensor press Create New Sensor See Defining and Editing Sensors on page 116 for more information Press Select as Default to select which sensor to use for schedule entries which are sent from Ascent with Selected Sensor set to Use instrument s default sensor If required press the left hand key beside your chosen channel so the text changes to Enabled then press twice to return to the Record Review Menu Section 10 Creating Editing and Deleting Items 113 RaM Adding Structures to Existing Machines From the Main Menu press EI Record Review If no machines are displayed press to make them visible Use the left hand arrow keys to select a machine and press 7 repeatedly to expand the machine so that its points and other lower level items are made visible Select the machine point or location where you want to add the new structure then press to display the machine creation icons Press the appropriate keys beside each icon to create that item Copying Machine Structures You can copy an entire machine or just part of its structure such as a point or parameter set and add the copied items to other machines Note Only the machine structure is copied when a new machine is created in this way recordings are not
68. ctrum Waveform from the Measure Menu the default parameters display on screen Spectrum Waveform t Accel Store i Units 400 Lines SER 1024 Samp BRA 100 Hz Fmax 0 Hz Fmin 4 s HH PTT SUE 10 SMe ir Avg 4 Linear 50 0 z Win Hanning Tach 2 E e OFF Beers Spectrum measurement setup showing default parameters Example e From the Main Menu press E54 Measure then press n Spectrum Waveform e Press to display hint labels then press Create New Paramset e The default parameters for a spectrum measurement are displayed To change a parameter value press the key beside the value s on screen label This will cause the parameter to cycle through the available options or it will open a sub menu where you enter a value via the keypad or select a value from a list If you have opened a sub menu save your changes by pressing v Section 5 Setting Measurement Options 55 vb Spectral Lines amp Wfm Buffer F 800 lines 2048 samples Spect Spec Wfm Spectral lines sub menu e To display Averaging parameters and Window type press ALT Creating Your Own Parameter Sets To create a new parameter set that you can store and reuse do the following 1 Open the menu for the measurement type you want to create from the Main Menu press all Measure then use the arrow keys to select the required measurement type and press to select it 2 Press to display hint labels then pr
69. d Look for a 180 30 phase change across the coupling in the axial direction for angular misalignment or radial direction for parallel offset misalignment Bearing misalignment cocked bearing will cause a twisting motion in the axial direction Look for a 180 30 phase change from the top to the bottom of the bearing housing or from one side to the other Imbalance A high amplitude peak will appear at 1X the running speed Confirm that the phase difference from horizontal to vertical on the bearing is close to 90 40 The phase difference between left and right horizontal locations should be within 30 of the phase difference between left and right vertical locations If the phase is unstable there may be another reason for a large running speed vibration e g looseness or misalignment You can investigate the degree of couple imbalance versus force imbalance by looking at the phase difference between the two sides of the machine if there is little couple imbalance then only a single plane correction may be required to balance the rotor Resonance flexible structures High amplitude peaks will appear where natural resonance frequencies of the structure coincide with excitation frequencies e g 1X other low orders of running speed blade pass frequency etc Look for a 0 phase change when both sensors are positioned in the same direction between two stationary points The phase change will be 180 when the
70. d to create a sensor definition before you can assign it to a channel See Defining and Editing Sensors on page 116 Use the arrow keys to highlight a sensor then press to assign it to your channel To enable the channel for measuring press the left hand key beside your chosen channel The text will change from to Enabled to indicate that this channel can now be used to take measurements 82 Section 6 Measurement Types and Their Uses vb Sensor Setup Change Enabled Accel 100mV g Sensor Enabled Accel 100mV q MISUEL IA Sensor Enabled Accel 100mV o MBISUEI IZ Sensor Enabled Accel 100mV o RUGU Sensor e Repeat this process to enable additional channels then press twice to begin measuring To save the measurements refer to the next topic Saving Multi channel Measurements Note If you are going to transfer your measurements to the Ascent software be aware that the program identifies recordings by their location and date time stamps If two or more recordings are taken at the same time and saved to the same location they will have identical date time stamp and location details this will cause the Ascent program to delete one of your measurements To prevent this we recommend that you adopt best practice and store your recordings in measurement locations that reflect the direction the sensors were placed when the measurement was taken 1 When you are ready to stop measuring press 2
71. e to allow some flexibility while limiting the chance of confusion e Press E Axis Point Mode to switch between Point and Axis e Press i Point on CH1 or press for CH2 and so on and use the arrow keys to select a point Press to confirm LEN to assign all Inboard bearings to channel 1 press to create a new match string and enter Inb Note that the preview list shows all matching points in the current folder For some naming conventions it will be necessary to use a space within the match string to differentiate between the points NDE and DE for example 100 Section 9 Using Routes we S Axis and Point Modes e Now you need to tell the instrument which channel to use for any other axes points eg axial Press n to select CH1 to select CH2 and so on The text All Others will display e To cancel multi channel recording press op The text none will display on the left hand column indicating that no channels are designated to a specific axis e Press to re display your route then begin recording as normal Note On the Route screen a summary of the multichannel configuration is displayed in the bottom left corner For example Points Dual Chan 1 2 indicates dual channel acquisition in Points mode Axes Triax Chan 1 2 3 indicates triaxial acquisition in Axis mode triaxial available on vb6 and vb8 models only Skipping Route Entries and Machines You can change the order in which you
72. e Main Menu press Folders e Press Edit Name ault Folder Folder Name Default Folder Capitalization 4 q a b c d e f g h i J k m n o e Press then E Clear All to clear the current folder name e Press three times until F displays Folder Name Capitalisation Aa e To enter the letter a press H once Folder Name Fa Capitalisation AA e Press E twice to display n Folder Name Fan Capitalisation Aa 26 Section 2 Instrument Basics vb 1 e Press Gi four times to display s Folder Name Capitalisation Aa e To enter a space between words press E If you make a mistake and wish to delete a character press EB e Press then to display the advanced editing menu containing options for using upper and lower case characters etc e When you have finished entering your text press to save Entering Punctuation Spaces and Special Characters To a ree from the alphabetic character screen press to display the punctuation menu Folder Name Capitalization 4 q e To use a punctuation character press the corresponding key The instrument will then re display alphabetic characters Section 2 Instrument Basics 27 b Spaces and special characters You can insert spaces between words change from upper to lower case and delete or insert special characters as required Pressing to display hint labels wi
73. e arrow keys to expand and collapse the route entry list Boat Engine t g 11 06 43 Axial 12 0 ie Auto Save Warn Single Chan Section 9 Using Routes 97 RaM e Attach your sensor to the location indicated on the instrument screen If you want to record all parameter sets at this location automatically rather than manually starting each measurement highlight the location rather than one of its parameter sets e Press to begin recording When the first location s recordings are complete the Route Menu displays again with the next location highlighted A percentage symbol indicates how many of the previous location s route entries were recorded e Press again to begin the next measurement Continue to take recordings until all route entries have been recorded Recording Multiple Channels on a Route Routes in the Ascent software are single channel sequences of measurement locations to be recorded The ability has been added to the instrument to re interpret these single channel sequences for multichannel acquisition When you collect the route measurements if a multi channel recording is required the instrument will prompt you to place the required number of sensors on their respective locations When you start the recording all measurements will be taken simultaneously Before you collect the first route recording you need to specify which channel will be used to record each point
74. e first spectrum has been recorded switch off the machine or begin ramping its speed up or down e Once the machine has stopped rotating or its speed has been fully adjusted press to stop measuring and return to the Coast down Run up Menu The measurement location will contain a large number of measurements You can transfer these to the Ascent software and display them as a waterfall chart and as a bode plot if you used the tachometer as well Section 6 Measurement Types and Their Uses 73 b Recommendations We recommend using a tachometer to obtain the RPM reading for each measurement as this aids interpretation You can set the Recording Interval as either a time interval between recordings or as a change in machine RPM We suggest using the latter with the RPM Difference set to machine speed 20 This will result in approximately 20 recordings being taken during a complete coast down or run up A large number of recordings are taken during a coast down or run up If you intend to repeat the process several times on a machine we recommend you save each set of recordings to a separate location so that they can be easily distinguished Cross Channel Phase Explained Phase analysis is an effective means of diagnosing machine faults such as misalignment resonance soft foot and looseness among others Phase analysis is also useful in distinguishing faults that look like imbalance but are actually caused by something else
75. eation icons Key Icon E Machine Turbine A o Point E Location set Schedule e To create a new machine press Add New Machine e Enter a name for the machine then press e To create points locations and parameter sets press the keys beside the appropriate on screen icons and repeat the previous instructions Creating Parameter Sets A parameter set describes the settings that are used to take a measurement A parameter set includes information such as the type of measurement Fmax the units of measurement and number of averages etc e From the Main Menu press Record Review and use the left arrow keys to select a machine If no machines are displayed press to make them visible 112 Section 10 Creating Editing and Deleting Items we S Press repeatedly to expand the machine until the required axis location is selected Press to display the machine creation icons then press Add New Schedule Select a measurement type The screen will display the default parameters for your measurement To assign the default parameter set to this location press m or to create a new parameter set press The new parameter set will appear at the top of the list ready for editing To rename this parameter set press EI Edit Name Enter a name for this parameter set then press Edit the other parameters as required To assign a different sensor press and refer to the sub heading below otherwise press to return to the Re
76. echarging the Instrument eeesssssss 150 Estimating Remaining Operating Time 150 Conserving Battery Power sssssssseeen 150 Setting Backlight Timeout ssseseeeeeeee 151 Setting Sleep Mode Timeout ssssssssessss 151 Setting Complete Powerdown Timeout uussss 152 Checking How Much Memory is Available 152 Freeing Instrument Memory cesses 152 Upgrading Instrument Firmware Proflashing 153 viii we S Section 14 Troubleshooting 155 Contacting Technical SUppotl rane rte neenon 155 Resetting an Unresponsive Instrument 155 Network Communications Problems ssss 155 Ethernet Connection Lost in Windows Vista 157 Appendix Specifications 159 j o kana ded 159 DUDEN E T TM 161 UD aes ate sa crc UM MINE IMEEM MR UM INE 163 VDE TT T M 165 a0 Gemeente 167 we S Section 1 Introduction This Instrument Reference Guide is the companion manual to the Ascent Software Reference Guide Please keep this book for future reference and read it before operating your inst
77. eeeee enne 19 Returning to a Previous Menu eeeeseeess 19 Using Navigation Keys and lcons sssesssss 20 Selecting an Option from a List ssseeesessssss 21 Canceling an Option siu cease reple cunt irure tenuerint 23 Displaying Hint Labels and Detailed Help 23 Displaying Alternative Options seesseeeeeee 24 Entering Alphanumeric Characters ssssssss 25 Entering Punctuation Spaces and Special Characters 27 Using Other ICOM tm 28 b Section 3 Using Sensors 30 Supported Sensor Types cccceeeeeeesssseeeeeeeeeeeeeeesneeees 30 Connecting Sensors to the Instrument 31 Mounting SENSONS ccce db cp e 32 Setting up the Accelerometer suuusssss 33 Permanent Mounting ccccceseseeeeeseeeeeeeseneeeeeteneeeeeneneeeeenaes 34 Setting up the Tachometer ssesesssssses 34 Tachometer Signal from a Keyphasor 36 Using a Strobe E m 37 Section 4 Analyzing Measurements Onsite 38 Tips for Taking Measurements seeeeseeeeees 38 Walk through Taking Measurements 39 Working with Charts 42 Analyzing Measurements
78. een displays the percentage of route entries that have been recorded at each location e To see what percentage of the entire route is complete press u to return to the Route Menu The percentage completed expressed as the number of route entries that have been recorded displays beside the route name Route 11 49 26 LI Boat Engine 10H 9 22 102 Section 9 Using Routes we S To return to the route and resume recording ensure your route is highlighted and press twice The instrument will automatically continue where you left off Saving Route Recordings There are three methods of saving route recordings 1 Record amp Review The instrument will pause after taking a measurement and continue to display the chart on screen until you begin the next recording Use this mode if you want to analyze each machine s condition as you collect the route Auto Save This method saves each recording then redisplays the Route Menu so that you can select the next recording Individual recordings can be reviewed if desired either immediately after measuring or at any time during route collection see next topic Free Run Manual Save The instrument takes a continuously updating measurement allowing you to watch the signal as it occurs on screen You can choose to save the measurement or stop measuring without saving You would normally use this method if you wanted to briefly check each machine s condition
79. ensor Setup Menu is not already displayed press Sensors from the Balance Setup Menu then select the number of sensors required and press e Press n CH1 Sensor and select a sensor or Create New Sensor if a new one as required refer to Defining and Editing Sensors on page 116 for more information e Press to return to the Balance Sensor Setup Menu To specify a 2nd 3rd or 4th sensor for dual plane balancing press Ul to as required and repeat the previous step Note The vb8 allows full four sensor simultaneous monitoring of both horizontal and vertical axes on each bearing This ability provides confidence that a balance on any one axis has not worsened vibrations on the other The vb7 allows simultaneous two channel dual plane monitoring e f you want the instrument to help you determine where to place your trial weights use the CH Position option on the left hand side of the screen see next topic otherwise skip this step and press to return to the Balance Setup Menu CH Position Note This item is optional 130 Section 11 Balancing Rotors vb7 and vb8 Instruments Only we S CH Position is used in conjunction with Reference Mark The instrument uses this information to calculate where on the rotor you should place your trial weights after taking an initial reading The aim is to reduce the initial vibration in order to maximize the accuracy of the trial weight readings The instrument will recommend a trial weight a
80. ensor excitation current Sensor detection 4 channels Accelerometer Velocity Displacement Current Voltage Output 16 V peak peak 0 V to 20 V 10 V to 10 V 20 V to 0 V 1 x BNC CH1 and 1 x LEMO CH2 CH3 CH4 24 bit ADC 0 mA or 2 2 mA configurable 24 V maximum Warns if short circuit or not connected Simultaneous sampling Allows for 8 V sensor output swing 80 g e g for reading prox probe gap Safety feature Break free inline connector 2 2 mA required for IEPE ICPG type accelerometer Tachometer Sensor Laser sensor range Other Sensor types supported Power supply to sensor TTL Pulse rating Keyphasor threshold Speed range Laser sensor with reflective tape included in kit 10 cm to 2 m nominal Contact TTL pulse Keyphasor amp 6 V to 8 V 50mA 3 5 V 4 mA min 28 V 5 mA max off state 0 8 V 13V 1V 10 RPM to 300 000 RPM 0 5 Hz to 5 kHz Sensor triggers on beam reflection Dependent on size of reflective tape vb has optically isolated input Battery voltage with current limit Parameter Indication Maximum levels Dynamic signal range Harmonic distortion Units Magnitude amp Cursors Accuracy Frequency response gt 1000 g 10 000 m s2 gt 1000 in sec 25 000 mm s gt 100 in 2500 mm gt 10 000 Amps gt 95 dB typical at 400 line resolution Less than 70 dB typical g or m s2 in s or mm s mil or mm or um adB vdB Amps Overall RMS value dual cursors harmonics
81. erages to one if spectra averaging is not required for example with run up and coast down recordings Average Type Linear averaging is suitable for most cases The amplitude value at each frequency of a spectrum is added to the same frequency of the next spectrum The sum is then divided by the number of averages taken Exponential averaging is occasionally used during manual measurements to give the advantage of a fast update rate while maintaining some averaging The most recent spectra have more influence on the average than earlier measurements Averaging is continuous until the measurement is stopped 60 Section 5 Setting Measurement Options we S Peak hold is useful for measuring the maximum amplitude peak that occurs over a period of time and for measuring resonances during a bump test Peak hold does not actually average the amplitude values but records and displays the maximum amplitude of each spectral line Average Overlap Overlapping is a means of collecting and displaying data more quickly As vibration measurements are collected a percentage of the new data is combined overlapped with each subsequent measurement The higher the overlap percentage the less newly acquired data is needed to generate a spectrum and thus the faster the spectrum can be displayed An overlap percentage of 50 is ideal for most cases Window Note Windowing is not available with waveforms Measured data is usually not directly
82. ere created after your instrument was purchased To re program an instrument with newer firmware you must PROFLASH the instrument with a new firmware file Warning PROFLASHING will restore the instrument to the factory default state and delete all stored information This includes folders routes machines parameter sets recordings and balance jobs If you wish to save any of this information please transfer all folders to the software before PROFLASHING your instrument e To check if a newer firmware version is available visit our website at www commtest com and check the Info and Downloads page You will need to register your instrument before you can download the latest software Firmware files are included with the Ascent software not provided individually Therefore you must update your Ascent software to access new instrument firmware Proflash Procedure Note The steps below assume your instrument is already configured in Ascent for connection See the Ascent Reference Guide for details e Connect the instrument to the PC using the supplied USB cable or any Ethernet cable If you want to save any information that is still stored in the instrument you should transfer this now e Start the Ascent software Section 13 Utilities 153 RaM e Select Edit gt Manage gt vb Instruments from the Ascent menu The Manager window will open e Double click your instrument identifiable by its serial number in the
83. ess Create New Paramset to create a new copy of the default parameter set 3 Press Edit Name and enter a description for this parameter set then press 4 The new parameter set will be highlighted to indicate that it is selected Press the keys beside the on screen labels to set your values as described in the previous topic Example Creating a custom spectrum ML set e From the Main Menu press Measure then press 6 Spectrum Waveform 56 Section 5 Setting Measurement Options we S e Press Create New Paramset e Press EI Edit Name and enter a name for this parameter set then press e Change Store Units to Acceleration Press ca and select the Accel then press m e Set the Fmax to 1500 CPM Press 8 Fmax Fmin then press to set the RPM to 10 x the machine running speed e Set the number of Spectral Lines to 3200 Press Spectrum Waveform and use the arrow keys to highlight 8200 lines 8192 samples then press e Set the Average Overlap to 62 5 Press to display Averaging and Window options and press Average E repeatedly to cycle through the values then press v e Your new parameter set is now ready to use If you have already defined a sensor and enabled a channel you can now take a measurement by pressing M Assigning sensors to channels is explained in the next topic Assigning Sensors to Channels You must specify which sensor is assigned to each channel When you take a measurement the instrument will kn
84. ess will return you to the Main Menu Displaying Hint Labels and Detailed Help Each on screen icon can also display a hint label Hint labels are turned off by default so that less screen space is used e To display hint labels press The hint labels will disappear when you press another key Collapse Navigator Expand b Navigator gt Review Edit Name A New E Delete amp n Recording Save Mode Section 2 Instrument Basics 23 e Example e From the Main Menu press EI Record Review A long press on will return you to the Main Menu if you have another menu open e Press to display the hint labels and press this key again to hide them Press and hold to display more detailed help information Example e From the Main Menu press and hold Detailed help text will be displayed i Measure Welcome to vb8 HELP Route Efficient data collection via Routes configured in Ascent Measure Set Parameters and take Measure W Vibration Measurements Record Navigate Machine structure Review and Review recordings Record Folders Add Edit or Delete Folders Ta Revi 7 eview and Clear recordings Balance Use the Initial Trial Trim Remote procedure to Balance rotors Folders Comms Options Config Units Sensors Screen Battery Time etc Balance A Options e Press again to hide the detailed help text Displaying Alternative Options Pres
85. ffect the vibration of the machine you are measuring stop those surrounding machines if possible 38 Section 4 Analyzing Measurements Onsite we S In addition to the measurements that you will be taking if possible stop and listen to the sound of the machine look for loose bolts and oil leaks take note of any machine parts that are vibrating visibly feel for hot bearings and manually feel the vibration e g with a screwdriver to look for symptoms that might later aid vibration analysis This should be done only if it is safe to do so If you have a stroboscope not included in the instrument kit you may wish to use it to freeze rotating shafts belts couplings etc to observe their operating shapes and relative speeds in order to look for symptoms that might later aid vibration analysis Walk through Taking Measurements Onsite analysis involves watching a machine s vibration on screen as it occurs and analyzing the measurement on the instrument rather than recording the vibration then transferring it to a PC for later analysis This method of measuring allows you to take a quick look at a machine s vibration patterns without storing the measurement You can choose to save the measurement at any time by creating a machine to save it to or by selecting an existing machine definition stored in the instrument Attach the sensor and tachometer if you are taking rotor speed and phase angle measurements Now s
86. ficient settling time for your sensor type Edit the Sensitivity The range of sensitivities will vary depending on the selected sensor s Store Unit To enter a decimal point press then Toggle the Store Unit e g between mV g and mV m s for accelerometers Toggle the sensor s Drive Current ON OFF Drive Current is the 2 2 mA power supply for ICP type accelerometers Toggle Bias Voltage Check on and off none and edit create or delete this value Notes on defining and editing sensors The Ascent software identifies sensors by their names If you rename a sensor in the instrument then send the folder to your computer the Ascent software will be identify this as a new sensor Once a sensor has been defined as a particular sensor type e g accelerometer you will not be able to change the sensor s type if the instrument contains any recordings taken with that sensor the instrument will associate these recordings with their sensor If you need to redefine the sensor type delete all the associated recordings in the instrument first When you set the parameters for a measurement you cannot choose settings that conflict with the type of measurement you are trying to create e g if you are measuring acceleration you cannot select a current sensor When you try to take the measurement the instrument will display a message similar to the following Incompatible Sensor Cannot take recording of type Current When using a sensor type
87. form each chart will display on screen You can view the measurements on all charts at the same time waveform or spectra only when viewing three of more measurements simultaneously such as when viewing 6Pack recordings or select a specific chart to work with When using analysis options such as zooming these will only be applied to the selected chart Selecting a chart e With the charts displayed press You don t have to display the hint labels but this will help e Press EB Select Chart The axes of the selected chart will become thicker and darker to indicate that this chart has the focus Press 9 repeatedly to toggle which chart you wish to work with Displaying a single chart e To make one chart fill the entire screen select the chart as described in the previous instructions then press o Chart Zoom e To re display all charts press o again Changing Chart View You can toggle between waveform and spectrum recordings and set the default layout of multi channel and single channel onscreen measurements using the Change View and Multi Chart Layout functions 46 Section 4 Analyzing Measurements Onsite we S Note The following functions are only available when viewing multi channel two or more and multi domain spectrum waveform measurements Selecting a chart layout e With the charts displayed press to display hint labels e Press o Change View to alter the currently displayed chart type Press repeated
88. form Display Number of samples Time scale Time synchronous averages Long time waveform 1024 2048 4096 8192 16 384 32 768 10 ms to 640 seconds 1 2 4 8 16 32 64 128 Up to 40 kHz Fmax 28 M samples Or orders based from 1 to 999 revs Only available when tachometer triggered Logging Features Output formats Data storage Data storage structure Max Folder size Direct print reports vb screen transfer to Ascent PC based software 1 GB non volatile flash memory Folders machines points locations routes 10 000 measurement locations Via Ethernet to PCL enabled printer Virtually unlimited recording storage No limits are applied 50 character names Balancing Planes Speed range Measurement type Weight modes Remove trial weights Manual data entry Storage Channel selection 2 planes 4 sensors 30 RPM to 60 000 RPM Acceleration velocity displacement Angle 0 to 360 fixed position circumference arc Yes No Yes Against machines in data structure Up to 4 channels simultaneously e g weights on fan blades linear dist around circumference Automatic recalculation Allows re entry of previous balance jobs No limits are applied Appendix Specifications 165 es Specifications Model vb8 Remarks Display amp Communications Display Resolution Viewing area Backlight Communications with PC Graphic Grayscale LCD 480 x 320 pixels HVGA 4 6 x 3 1 117
89. ge the units as required then press After you take the initial reading the instrument will display the suggested trial weight mass in the upper left of the screen Note In Manual input mode and without a tachometer connected no suggested angle and weight will be provided by the instrument Reference Mark Note This item is optional Reference Mark is used in conjunction with CH Position The instrument uses this information to calculate where on the rotor you should place your trial weights after taking an initial reading You need to enter both the Reference Mark Location and the CH Position so that the instrument can calculate the trial weight angle Refer to topic CH Position for more information e f the Balance Machine Menu is not already displayed press Machine Information from the Balance Setup Menu e Press EI Reference Mark and enter the angle from the tachometer reflective tape to your reference mark then press If these marks are aligned with each other enter zero After you take the initial reading the instrument will display the suggested trial weight angle in the upper right of the screen Weight Orientation Weight Orientation allows you to choose where to place balance weights on a rotor relative to the rotor s direction of rotation With rotation WR means you choose a reference point then place your weights forward of that point in the direction of rotation i e in the same direction as the rotor turns
90. hammer is required along with the strength and direction of the bump to ensure that suitable frequencies are injected into the structure without causing damage From the Main Menu press Ed Measure and use the left hand arrow keys to highlight Bump Test then press Use the left hand arrow keys to select a parameter set or press to create a new one and set the parameters as required 72 Section 6 Measurement Types and Their Uses we S e Press to begin sampling and bump the machine with a hammer Repeat several times Bump test measurements are taken in free run mode and use peak hold averaging The instrument will take continuous samples and update the peak value for each spectral line whenever a line exceeds its previous value Coast down Run up Note This feature is not available on the vb5 or vb6 instrument models Coast down and run up measuring involves taking a series of recordings with a short delay between them This technique can be used to study the resonance behavior of a machine as its speed gradually increases during power up or decreases during coast down e From the Main Menu press Ea Measure and use the left hand arrow keys to highlight Coast down Run up then press e Use the left hand arrow keys to select a parameter set or press MI to create a new one and set the parameters as required e Press and select the machine location to save measurements to then press again to begin measuring After th
91. he Equivalent Fmax which determines the maximum frequency displayed on screen will affect the available recording time a high Fmax reduces recording time while a low Fmax increases the total amount of time available for recording While the instrument is recording you can display the on screen signal as a waveform or convert it to a spectral display by pressing Display Type amp Resolution and selecting your preferred display type e From the Main Menu press Ed Measure then use the left hand arrow keys to highlight Long Time Waveform and press e Use the left hand arrow keys to select a parameter set or press to create a new one and set the parameters as required 78 Section 6 Measurement Types and Their Uses we S Press to begin measuring During measuring the number at the top of the screen indicates how many recordings have been taken The default onscreen display during measurement will show spectrum and waveform simultaneously When measuring is complete the screen will display a waveform block or spectrum if you selected this option and a trend of the overall power in the last recording To view the power in another recording use the right hand arrows to move the cursor 0 0149mis i 5 0000Block 4 00 Block 6 00 3 00 mg 0 0210m s rms 0 19m s tp p vw lili NR T 0 05 RMS max T I 1 lu I I N 0 03 i 2 1 j 1 I Mibi UB IN HI 0 00 I PNEU N HN A ha Hb
92. ich may affect balancing results if they fall off later Ensure that any weight s you add will not come loose at the normal rotor speed and that it will not obstruct machine motion If possible manually rotate the rotor to ensure that the weight does not clash with any part of the machine keeping in mind that the rotor s center line may shift when operated at its normal speed Ensure the weight of any mechanism used to hold the correction weights in place is included as part of the correction weight If you are welding on the weight make sure that the weight of the flux is not included scrape the flux off before weighing the electrode Ensure that the shape of the correction weight does not cause it to become a dirt trap since dirt accumulated on the weight may cause rotor imbalance It is important to attach the correction weight s at the same radial distance that the trial weight was i e if the trial weight was attached n mm inches from the center of the rotor the correction weight must also be attached n mm inches from the center of the rotor Section 11 Balancing Rotors vb7 and vb8 Instruments Only 125 b The Tachometer The tachometer provides the instrument with information regarding the rotational speed of a rotor and the angle at which the rotor is vibrating The angle is measured from a fixed reference mark on the rotor and is called the phase angle To balance a rotor you must consider both the amplit
93. ies vbSeries instrument capabilities vary according to model variant For details of your specific instrument model s capabilities see the information listed below Measurement Capabilities vb8 Route Enabled Demodulation Spectrum Waveform 6Pack Keypad Entry Average Value Time Synchronous Average Bump Test Coast down Run up Cross channel Phase Long Time Waveform Average Value applies to Displacement only on vb7 instruments Section 1 Introduction 3 Sensor Output Accepted Acceleration Velocity Displacement Current Voltage Output Measurement Channels Max Single 1 Channel Dual 2 Channel Simultaneous Four 4 Channel Simultaneous Balancing Capability Balancing 2 Planes Balancing 2 Sensors Balancing 4 Sensors vb8 vb8 vb8 4 Section 1 Introduction vb Precautions Please read and understand this section before operating your instrument Heed all warnings and recommendations to prevent data loss data inaccuracy damage to the instrument or injury to yourself Do not attach sensors to any object with a high potential voltage i e a voltage that exceeds 50 V DC or 32 V AC or the safety extra low voltage SELV defined by your local power authority Ensure the cables and bootstrap cannot become entangled with any rotating or moving machinery Do not bring any objects sensitive to magnetic
94. iew additional recordings Deleting Recordings To delete an individual recording access the Record Review Menu and select the recording as described in the previous topic e Press E to delete the recording and confirm the deletion by pressing Hm Section 7 Taking Recordings Offsite Analysis 89 Attaching Notes To add a text note or comment to a recording e Highlight the recording in the Review column then press EX to open the Note Menu Refer to the appropriate topics in Working with Notes page 120 for details of how to create and attach notes to your recordings Working with Baseline Recordings Baseline recordings are primarily used to assess the data quality of new recordings If the new overall value has changed significantly compared to the baseline then the sensor position and mounting should be re checked The baseline is selected in the Ascent software and sent to the instrument during the normal Send operation Within Ascent you can choose whether the full baseline spectrum is sent if not only the overall value is sent If you choose to use a full spectrum you will be able to display both together on the instrument and make detailed comparisons However the Send operation will be considerably slower The next time you take a recording the baseline overall power level will display in the top right hand corner of the screen directly underneath the current recording s overall power level The instrument
95. in stored in the instrument so they can be applied to future recordings e From the Main Menu press EI Record Review e f no machines are displayed press repeatedly to make them visible Section 10 Creating Editing and Deleting Items 115 Use the arrow keys to select a machine To make the points and other lower level items visible press repeatedly Select the item you wish to delete then press 5 Delete Press when prompted to confirm your action Working with Sensors Defining and Editing Sensors From the Main Menu press o Options Press E Sensor Setup then press Change Sensor opposite your chosen measuring channel To create a new sensor press Create New Sensor or use the left hand arrow keys to select an existing sensor then press EI to change its settings Sensor Accel 100mV g 100 MEIST Accel mV g Unit Voltage Rng AC 8V and Coupling Drive Settling Big ON Current Bias Voltage EOS ON none Mee Define the settings by pressing the corresponding keys When you are finished press E Edit the Name Toggle the Sensor Type between acceleration velocity displacement and current Toggle Voltage Ring and Coupling settings 116 Section 10 Creating Editing and Deleting Items we S E BE H Toggle Auto Settling ON OFF When Auto Settling is ON the instrument will ignore the user specified settling time see above and will automatically select the most ef
96. ing Off route Recordings When collecting data you may decide to take additional measurements that are not part of the route sequence This might be necessary if a machine s vibration pattern does not look as expected when taking the measurement e Press and hold E to temporarily step out of the route and return to the Main Menu From here you can set up a new measurement e Take and review the measurement as normal saving it to the machine location if desired When you next transfer data to the computer any additional recordings you ve saved will be sent along with the collected route 106 Section 9 Using Routes we S e To return to the route from the Main Menu i Route Use the arrow keys to highlight your route and press A E appear asking if you would like to continue Press to continue where you left off Editing or Deleting a Route Route creation editing and deletion is carried out using the Ascent software You cannot edit or delete routes directly in the instrument To remove a route you must first delete it in the Ascent navigator then send that folder to the instrument Because the folder no longer contains the original route this route will not appear in the instrument To edit a route make your changes in the Ascent navigator then re send the folder to the instrument Note Deleting a route does not delete the machines and parameter sets that make up the route These will remain stored in the instrument
97. instrument models to make the most use of Average Value measurements e From the Main Menu press Ed Measure then use the left hand arrow keys to highlight Average Value then press e Use the left hand arrow keys to select an existing parameter set or press to create a new one and set the recording parameters as required Note This feature is not available on the vb5 instrument model Ensure the sensor set up corresponds with the measurement type you wish to take Create new sensors where necessary The instrument will record values in the sensor s native units only e Press to begin recording Section 6 Measurement Types and Their Uses 81 RaM Taking Multi channel Simultaneous Measurements Taking a multi channel measurement uses the same process as taking a single channel measurement The only difference is that you must enable more than one channel and save each measurement separately You do not have to save each channel s measurements as you can selectively choose which ones to keep e g you can save a measurement taken on channel 2 but discard the measurement taken on channel 1 Setting up Sensors and Channels Select your measurement type and parameters as normal and press ilsi then Sensor Setup You will need to assign and enable a sensor to each channel you are measuring Press Change Sensor opposite your chosen measuring channel If this is new sensor that has not yet been defined in the instrument you will nee
98. ion 3 Using Sensors we S Setting up the tachometer e Locate the drill hole in the tachometer and screw this onto the end of the mounting base movable arm e Plug the cable socket into the tachometer connecting pins then turn the locking ring to make a secure connection e Locate the TACH input on the instrument and attach the other end of the cable to this e Stop the rotor e Cut out a small strip of the supplied reflective tape approximately 5 mm x 15 mm 0 2 x 0 5 e Stick the reflective tape to a machine part that rotates at the rotor speed e g the shaft This trigger spot should provide a pronounced increase in reflection as it passes under the tachometer light beam The tape width must be at least double the diameter of the light beam spot e Mount the tachometer magnetic base to a stationary portion of the machine convenient to the trigger spot e Position the tachometer slightly away from the centerline of the rotating machine part in order that it is not blinded by reflections from the surface of the machine part The sensor should be positioned within the measurement range shown in the following diagram Tachometer Reflective Tape Connect to A magneti Rotating nase lt gt amp machine Range part 10 cm to 2 m e Start the rotor and wait till it is at normal running speed Section 3 Using Sensors 35 x e Now test if the tachometer will trigger From the Main Menu press E Measure
99. is correctly set to Instrument select a different option from the drop down box if required Then select your instrument from the Instruments dropdown list Receive Comms Method Instrument z Configure Instrument vox x Add Configue Receive Folders in Receiving into Ascent Default Folder 0 machines 0 new recordings 0 Refresh Select All Deselect all Receive Close 92 Section 8 Sending and Receiving Information we S e The instrument transfers recordings by sending entire storage folders to the PC Select which folders you wish to transfer by ticking the checkboxes beside their names e Click Receive near the bottom right of the window to begin transferring recordings When the transfer is complete click Close Transferring Folders to the Instrument e f you are using the Commtest supplied data transfer cable connect this to the USB ports of the instrument and computer Note Before communication between the instrument and the Ascent software can begin the instrument must be added to the Ascent software See the Ascent Software Reference Guide for details e Power up the instrument and open the Ascent program Click the Ascent Send button to establish communication between the software and instrument Check that the Comms Method in the upper left of the window is correct select a different option from the drop down box if required Then select your instrument fr
100. l appear in the upper left hand corner of the screen for a dual plane balance the CH2 icon will also appear To enter your own values for CH1 press IN or press 2 for CH2 for two channel measurements for more than two channels press E and choose a channel from those listed Press iai to enter an amplitude value and Ed to enter phase Press M twice to exit and return to the Initial Trial or Trim Reading Menu and continue the balancing job Setting up a Balancing Job The Balance Setup Menu gives you a large degree of flexibility in how you set up balancing jobs Many of the setup items are optional you can also select items in any order you wish e g you can select a machine to save the balancing report to at the beginning or end of the process or perform balancing without saving the report From the Main Menu press 5 Balance Press ia New Job This clears any existing setup data from previous balancing jobs Press EI Setup and use the options in the Balance Setup Menu to apply your preferred balancing settings Section 11 Balancing Rotors vb7 and vb8 Instruments Only 127 vb Balance Setup 60 Balance 1 3 Planes Weight Orientation Sensors Averages fi Standard Tach Type DENG optional 9b MEI Information m Lin Dist mm rms Store Automatic Units The rest of this section describes the Balance Setup Menu options Balancing Walk through on page 140 explains how to
101. l is selected When the prompt appears press M to synchronize the time or to keep the instrument s date time settings Section 8 Sending and Receiving Information 95 Section 9 Using Routes This section describes how to manage routes with your instrument You will learn to Use a route to take recordings Change the order in which recordings are collected Review recordings during a route Take off route recordings What is a Route A route is an ordered list of measurement locations and pre defined measurement setups parameter sets that you follow when taking recordings Using a route simplifies the task of taking recordings and minimizes the potential for mistakes When the instrument is operating in route mode it guides you through each measurement location in sequence Before creating a route you must first create the machines and measurement setups then create the routes by selecting these items and placing them in the desired order A route can only be made up of machines that are stored within the same folder as the route You will need to use the Ascent software to create and manage your route library then transfer your folders to the instrument see the Ascent Software Reference Guide Creating a Route There is no limit to the number of routes you can send to the instrument Each folder can store any number of routes until the instrument s memory capacity is reached Walk through Taking Recordings Using a
102. l spectrum The high frequency signals that demodulation aims to extract are very localized therefore extra care must be taken to ensure the accelerometer is set up correctly Ensure that gt The accelerometer is mounted close to the signal source gt The accelerometer is well coupled using either stud mounting or a very strong magnet on bare metal A handheld probe or stinger is not recommended gt The accelerometer mounting is consistent between visits otherwise trend plots of overall RMS values will be meaningless The bandwidth you select determines which range of frequencies the demodulation process will use We recommend you use the following procedure to determine an appropriate bandwidth e First take a quick snapshot spectrum measurement From the Main Menu press Measure then press Spectrum Waveform e Press to create a new parameter set then set the Store Units to Acceleration and Fmax to 20 000 Hz 1200 kCPM e Press to begin measuring 66 Section 6 Measurement Types and Their Uses we S e Examine the chart for a region of broadband high frequency noise or haystack Such a haystack might look like the one below Amplitude Haystack Frequency e When you set up your demodulation measurement select a bandwidth which includes the haystack but excludes any large individual peaks such as those shown to the left of the haystack in the example diagram It is very important that all the
103. large amplitude low frequency peaks are rejected If there are no significant haystacks displayed we recommend a standard bandwidth of 2 to 10 kHz 120 to 600 kCPM When you have determined an appropriate bandwidth proceed with the demodulation measurement Analyzing Demodulation Data Measuring recording and viewing data is exactly the same as for a Frequency Acceleration spectrum The demodulation spectra can also be transferred to Ascent and analyzed using the same techniques as for normal spectra e g trend plots alarms fault frequencies bearings and gears The following are points to keep in mind when analyzing demodulation data e Bearing tones appearing in the demodulated spectrum but not in the normal spectrum are a good early warning indicator This often points to insufficient lubrication e As the bearing deteriorates the baseline noise level increases and bearing tones develop running speed sidebands Section 6 Measurement Types and Their Uses 67 m RaM e n the final stages of bearing wear the bearing tones may become less prominent as cracks and pits become more rounded and distributed over the race 6Pack 6Pack allows up to six measurements to be taken simultaneously from a single data stream channel All standard condition monitoring data can be acquired in one step and in the time normally required to take a single conventional recording A 6Pack recording may include some or all of the following mea
104. ll help you use the various editing commands Example e From the Main Menu press Folders e Press Edit Name e Press to activate alternative functions then to display the advanced editing menu containing options for lower case letters deleting characters etc _ A CAPS g tock AA Lower l Delete case aa Deue o y Folder a Character Clear All amp Using Other Icons Each on screen icon represents a function that you can use to perform a task such as creating or deleting an item To perform the task represented by the icon a the key beside that icon Remember that you can press to display hint labels for each icon Use these icons to create your machines 28 Section 2 Instrument Basics we S Use To do this E Create a new machine EB Create a new point Create a new location Create a new parameter set Use these icons to manage all your items To do this Create a new item m Edit the selected item Delete the selected item Copy the selected item into memory Paste the copied item to the highlighted position Section 2 Instrument Basics 29 Section 3 Using Sensors This section explains which sensors are compatible with your instrument and describes how to use them You will learn e What sensors may be used with your instrument e How to use the supplied accelerometer and tachometer e How to correctly mount a sensor Sup
105. ltiple Recordings 86 b Saving Recordings sisson a OaE 87 Reviewing Recordings oes netus oper pln c xs cC cU QE MEE 88 Deleting Plecordings usi auc adiens tie bbs datu hue ie abr nbus 89 huregjpa eH TrTc 90 Working with Baseline Recordings ssssse 90 Section 8 Sending and Receiving Information 92 Transferring Recordings to the Ascent Program 92 Transferring Folders to the Instrument 93 Re sending Updated Folders sessese 93 Synchronizing the Timezone on the Instrument and PC 94 Section 9 Using Routes 96 What is a ROUES dd 96 Walk through Taking Recordings Using a Route 96 Recording Multiple Channels on a Route 98 Skipping Route Entries and Machines 101 Locating Skipped Route Entries ssssss 102 Tracking Your Progress Through a Route 102 Saving Route Recordings eeeeseeeessesssss 103 Selecting Recordings to Review ssessssssss 104 Retaking SCONGINGS secun tepida Ee a utbs etai epede 105 Deleting a Route Recording esssssse 106 Taking Off route Recordings sseesuusss 10
106. lud The top chart can also display a trend of the machine speed if you used a speed sensor To toggle between overall power and RPM press When measuring is finished the selected measurement location will contain many individual recordings When the waveforms are later transferred to the software and displayed as spectra the equivalent Fmax value will be used on the chart The actual sampling rate is 2 56 times higher than this Fmax value Viewing Long Time Waveforms on your PC When you have finished recording the selected measurement location will contain many individual 4096 sample recordings After transferring these to your PC you can then use the waveform Section 6 Measurement Types and Their Uses 79 ee x analysis tools to create a high resolution spectrum of the recordings by selecting Analyze gt Partial Waveform Analysis or Freq Based Waveform Analysis refer to your Ascent Software Reference Guide for full instructions Keypad Entry Keypad entries can be used to collect additional information about your machines such as temperature or motor current The person collecting the data must manually enter a numeric value via the keypad rather than collecting data with a sensor Full details on the practical applications of keypad entries are contained in the Ascent Software Reference Guide e From the Main Menu press Ed Measure then use the left hand arrow keys to highlight Keypad Entry and press
107. ly to toggle between waveform or spectrum displays for up to four channels and spectrum waveform to view both measurement types onscreen simultaneously for individual channels Changing how multi chart layouts are displayed e With the charts displayed press to display hint labels e Press then press o Chart Data Change to open the Multi Chart Layout screen e Press 5 to choose which channels will be displayed in your Multi Chart Layout e Press jal or Ed to pick a layout from those listed For single channel displays you may choose waveform spectrum or spectrum waveform For multi domain measurements using three or more channels and with all channels set to display simultaneously Show All Channels in the previous step you may only select waveform or spectrum for simultaneous display not both Setting the Y Axis Amplitude Scale Toggling the left axis scale between Linear Log and dB will increase or decrease the amplitude of displayed peaks allowing you to see either the bigger picture or a more detailed view of the data The Linear scale is suitable for most cases Log scaling base 10 is more useful for displaying vibration with both very large and very small amplitudes Section 4 Analyzing Measurements Onsite 47 RaM e With the spectrum measurement displayed P B nc still measuring or stopped and highlighted press then Y Axis Log to set the Y axis amplitude scaling options e Press LE Linear
108. lysis single and dual plane vb7 and vb8 instrument models only e Route and off route recording modes Standard Kit Items Note Additional accelerometers and associated accessories are included with multi channel instruments e vbSeries portable instrument vb5 vb6 vb7 or vb8 analyzer with carry strap and sensor bracket Power adapter 12 V 3 A output center positive DC car adapter 12 V DC output USB data transfer cable Accelerometer s IEPE ICP type Accelerometer coiled cable s Accelerometer magnetic mounting base s Triple BNC adapter vb6 and vb8 instrument models only Non contact laser tachometer sensor Ascent vibration analysis software on CD ROM iLearn vibration training CD ROM Instrument Reference Guide Software Reference Guide Quick Start Guide Warranty card QA card Carry bag Number provided varies according to instrument model vb5 1 unit vb6 vb7 2 units vb8 4 units Balancing kit items vb7 and vb8 instrument models only Reflective tape Adjustable tachometer stand with magnetic mount Tachometer extension cable 5 meters Accelerometer extension cables 5 meters 2 Section 1 Introduction we S Number provided varies according to instrument model vb7 2 units vb8 4 units Note Thoroughly inspect your instrument kit s contents upon receipt If any kit items are missing please contact Commtest customer support or your sales agent for assistance Instrument Capabilit
109. main menu screen press E Balance Press i New Job to clear your setting or press Setup to use your existing configuration Press E Balance Planes then use the arrow keys to highlight the number of balance planes to use Press to select This will display the Balance Weight Setup Menu From the Balance Weight Setup Menu press ia Plane A Weight Position then use the arrow keys to highlight your choice and press to select If you select circumference arc or fixed positions this will open the Circumference or Fixed Position sub menus where you need to specify the rotor circumference or the number of fixed positions Enter the required value then press Note The circumference units used inches or mm are set in the Balance Setup screen by pressing Weight Lin Dist then Linear Distance If you have selected dual plane balancing press i2 Plane B Weight Position and repeat the previous steps for Plane B Section 11 Balancing Rotors vb7 and vb8 Instruments Only 129 m x e Press repeatedly if necessary to return to the Balance Setup Menu from where you will specify your sensor settings If you selected dual plane balancing pressing M will automatically take you to the Balance Sensor Setup Menu Sensors This option lets you specify the number and type of sensors you are using This menu also contains an option that allows the instrument to recommend where to place trial weights optional e f the Balance S
110. me the current folder Warning All folder backups will be erased during an instrument Proflash page 153 Note The parameter set and sensor tables are global across all folders The restore process will therefore be most successful if none of these have been deleted since the folder was overwritten or deleted Working with Machines If you intend to take large numbers of recordings on a regular basis you should create permanent machine structures so that you can save your recordings to named locations You can group your machines within different folders so that they can be segregated by type geographic location or frequency of data collection etc The fastest and easiest way to create your machines is to use the Ascent software to first create your folders machines and schedule entries then send these to the instrument Please refer to the Ascent Software Reference Guide Section 2 Basic Operation for more information When you create machines and measurement parameter sets in the instrument these are automatically added to the Ascent database when you transfer data from the instrument to your PC Section 10 Creating Editing and Deleting Items 111 ib Creating Machine Structures e First select the folder you want to store your machines in Folders and use the From the Main Menu press E J left hand arrow keys to highlight a folder then press e Press Record Review then press to display the machine cr
111. mps gt 95 dB typical at 400 line resolution Less than 70 dB typical g or m s2 in s or mm s mil or mm or um adB vdB Amps Overall RMS value dual cursors harmonics 196 0 1 dB 0 1 dB from 10 Hz AC or 0 Hz DC to 15 kHz 3 dB from 1 Hz AC or 0 Hz DC to 40 kHz Effective limit is sensor sensitivity and output voltage Other distortions and noise are lower 0 peak peak peak or RMS Auto scale by 1000x when required US amp SI options for both adB amp vdB Digital readouts on chart For DC level F S amp AC measured at 100 Hz Acceleration and velocity From value measured at 100 Hz Spectrum Display Fmax possible ranges Fmin possible range Resolution Frequency scale Amplitude scale Window shapes Overlap Number of averages Averaging types Demodulation bandwidths 25 50 100 125 150 200 300 400 500 600 800 1000 1200 1600 2000 2500 3000 4000 5000 6000 8000 10 000 15 000 20 000 30 000 40 000 Hz 0 to Fmax 400 800 1600 3200 6400 lines Hz CPM Orders Acceleration velocity displacement or current Hanning rectangular 0 12 5 25 37 5 50 62 5 75 87 5 1 2 4 8 16 32 64 128 Linear exponential peak hold synchronous 21 bandwidth options Or equivalent CPM values Or orders based from 1X to 999X vb instrument zeroes all spectral lines below Fmin 3200 lines max for dual channel measurements Linear scale with zooming Linear or log scales au
112. n also display the amplitude and phase angle of the 1X vibration This can be used to Verify the machine running speed View the phase angle of the vibration relative to the tach signal gt Take a quick preview of the out of balance level Connect the tachometer that will be used to measure the RPM Attach a vibration sensor if you wish to see the vibration amplitude From the Main Menu press 2 Measure then press EX Tach Select the Standard tachometer or Keyphasor sensor by pressing To see the amplitude and phase angle relative to the tachometer signal press Tach Vibration Change any parameters as required 70 Section 6 Measurement Types and Their Uses we S e Press to take the reading The Tachometer Reading Menu will display a continuously updating RPM and the equivalent value in Hz Tach Vibration Ref Mark E 3028 RPM 50 5 Hz CH1 0 02 m s rms 24522 Time Synchronous Averaging Note This feature is not available on the vb5 or vb6 instrument models Time synchronous averaging is a useful vibration analysis technique for distinguishing between spectral peaks that are very close to but not exact harmonics of the machine s running speed After performing a large number of averages peaks that are whole number multiples of the running speed will still be visible while those that are non synchronous will be cancelled out from the spectrum The key par
113. n level amplitude at each time interval during the measurement period The more sample points in a spectrum the higher the resolution of the waveform but the more memory used The key parameters you need to set are the duration and number of samples The duration determines the equivalent Fmax value If the waveform is later transferred to the Ascent program and displayed as a spectrum this Fmax value will be used on the chart The number of samples controls the number of spectral lines used when the waveform is transferred to the Ascent program and displayed as a spectrum e From the Main Menu press 2 Measure then press E Spectrum Waveform e Use the left hand arrow keys to select a parameter set or create a new one by pressing parameters as required and setting the e Press to begin measuring Section 6 Measurement Types and Their Uses 65 m RaM Demodulation Explained The demodulation process looks for repetitive patterns created by impact events that lie embedded within a time waveform The process works by extracting the low amplitude high frequency impact signals and then tracing an envelope around these signals to identify them as repetitions of the same fault The resulting spectrum with the low frequency data removed will now clearly show the high frequency impact signals and harmonics Demodulation is also useful as an early warning device as it detects bearing tones before they are visible in a norma
114. n level depends on the speed of the rotor it is important to take all readings while the rotor is operating at its normal speed From the Balance Setup Menu press to take the initial reading The initial reading measures the out of balance level of the rotor After a few seconds the instrument displays the speed of the rotor in RPM and Hz the vibration level due to the imbalance i e amplitude at 1X the rotor speed and the phase angle of the vibration Note that our measurement shows an Section 12 Balancing Walk through vb7 and vb8 Instruments Only 141 wh amplitude of 3 59 mil The aim is to reduce this to an acceptable level Ab For dual plane balancing two sets of values will display Initial Reading gs 0 RPM 0 Hz CH1 238 36 e Wait for the readings to stabilize then press Step 4 Balance the Rotor With Initial and Trial Readings completed the Balance Weight Menu will now display The instrument displays the weight required to correct the initial imbalance and the angular position at which it must be attached 46 09 259 WR Balance Weight Plane A D Last Reading Calculated Weight thase aT Ne X E Z on te SS NS S a Ye amp NA e Stop the machine If you are removing trial weights as you go do this now before attaching your correction weight 142 Section 12 Balancing Walk through vb7 and vb8 Instruments Only we
115. n when using an IEPE ICP type accelerometer otherwise the measurements will be incorrect Mount the sensor properly before taking measurements to ensure their accuracy and consistency Use a mild detergent diluted in warm water to clean the instrument Do not use abrasive or polishing substances hydrocarbons petrochemicals or solvents as they will degrade the plastic casing Do not place the instrument or the magnetic mounting base anywhere that the temperature might exceed 140 F 60 C This will degrade the battery pack and magnet If the instrument malfunctions return it to an authorized dealer Do not attempt to repair the instrument yourself as this will void your warranty 6 Section 1 Introduction we S Hazardous Locations Selected models of the vbX range have been approved by the Canadian Standards Association CSA for use in hazardous locations meeting this classification Class l Division 2 Groups A B C D Those models are clearly identified with the CSA logo and a Hazardous Location information panel Models without those markings are NOT approved for operation in hazardous locations The Class Div 2 classification is officially defined in the Canadian Electrical Code part 1 but can be summarized as A location in which volatile flammable gases or vapors are present but confined within closed systems from which they can escape only in case of accidental rupture or abnormal operation or in which
116. ne It does not need to be referenced to the tachometer reflective tape position In dual plane balancing establish a reference mark on Plane B also It does not need to correspond with the Plane A reference mark Attach a trial weight to the balancing plane It is important that the trial weight is not too large as this may damage machine bearings and not too small as its effect will be imperceptible Your trial weight must be of sufficient mass to change the imbalance by approximately 3096 in amplitude or 3096 in phase these figures are the industry norm This will allow the instrument to perform its calculations accurately The trial weight position should be near the rim of the rotor but can be at any angular position Starting at the reference mark measure the angular position in the direction you specified for the Weight Orientation This will be either WR with rotation or AR against rotation In the Trial Weight Menu press us and enter the value for our trial BH If you need to enter a decimal point press then Press to return to the Trial Weight Menu then press ES and enter the position of your trial weight in relation to the reference mark 136 Section 11 Balancing Rotors vb7 and vb8 Instruments Only vb eoe e Press to return to the Trial Weight Menu Press to specify whether you are adding or removing drilling out weight 1g Trial Weight Plane A owr fll 123 No Suggestion Ref Mark No
117. ne automatically see next topic From the Main Menu press E Options Press LJ Date Time then press EI to set the date or to set the time Press the number keys to enter your values the cursor will automatically advance to the next position If you enter an incorrect number press the key repeatedly until the cursor returns to the beginning of the line then start again Press to save your changes 146 Section 13 Utilities we S Adjusting the Date Format e From the Main Menu press o Options e Press o Date Time e Press o repeatedly to cycle between date display formats from DD MM YYYY to MM DD YYYY for example Selecting Your Local Timezone e From the Main Menu press E Options e Press o Date Time then press 2 Edit Timezone e Use the arrow keys to highlight your local timezone then press to select Note You can jump to the top and bottom of the list using the right hand arrow keys and Adjusting Sound Volume e From the Main Menu press o Options e Press 8 Sound e Use the right hand arrow keys to adjust the volume up or down Press and hold to turn sound off e Press Ed to test the volume then to save your setting Set the Instrument Language The language used by the instrument interface varies from region to region based upon the original purchase location Some regions such as North and South America include more than one selectable language option To change the language used by an instrumen
118. new window The instrument properties window will open e Click the Proflash button under the Setup tab The Proflash window will appear listing the available firmware version s stored on your PC e With the newest recommended firmware version HB click the Proflash button When prompted press on the instrument PROFLASHING may take several minutes during which the instrument will display a series of progress messages Note Do not interrupt the PROFLASH process as this may damage the instrument e Once Proflashing has completed restart the instrument by pressing and together 154 Section 13 Utilities we S Section 14 Troubleshooting Contacting Technical Support If you have any problems please contact Commtest support staff directly for assistance Our e mail address is help commtest com We also provide a searchable knowledge base of frequently asked questions FAQ on our website at www commtest com Resetting an Unresponsive Instrument Warning An unresponsive instrument one that does not respond to key presses will continue drawing power until it is reset or turned off To conserve power you must therefore reset the instrument as soon as possible Note Resetting the instrument will not delete previously stored data or settings e Hold E then press 4 The instrument will power off and re start immediately Network Communications Problems The instrument and the Ascent program use a default netw
119. ng phase readings at a location from one recording to the next to the next Also compare the phase readings at 30 increments around a bearing housing the phase will be significantly different at each angle Mechanical foot looseness soft foot A high amplitude peak will show up at 1X the running speed Look for a 90 to 180 phase change between the machine foot and its concrete base The soft foot may also have a different phase measurement from the other feet Measuring Cross Channel Phase Note This feature is not available on the vb5 or vb6 instrument models The key parameter you need to set is the machine speed The machine speed can be the actual speed of the machine or the frequency of interest these are usually the same as the most 76 Section 6 Measurement Types and Their Uses we S common fault types you will be looking for occur at the machine s running speed Connect two sensors to the appropriate machine locations From the Main Menu press 27 Measure then use the left hand arrow keys to highlight Cross Channel Phase and press Use the left hand arrow keys to select a parameter set or press ME io create a new one then set your units and machine speed You will need to assign two sensors and enable both channels Press then press E Sensor M create or select your sensors as required Press to continue Press to begin measuring both channels Cross Channel Phase Ref Mark C 1014 RP
120. ngle based on the following The phase of the initial reading The angle between the tachometer and sensor the CH Position The angle between the tachometer reflective tape and the weight reference mark on the rotor the Reference Mark You need to enter both the CH Position and the Reference Mark Location so that the instrument can calculate the trial weight angle See Reference Mark page 133 for further instructions If the Balance Sensor Setup Menu is not already displayed press Ea Sensors from the Balance Setup Menu select the number of sensors to use then press Hm Press ia CH1 Position and enter the angle from the tachometer to your sensor Ps then press For dual plane balancing repeat this step if you want the instrument to recommend trial weight placement angles for both planes Reflective Tape Weight Reference Mark Accelerometer Os s Tachometer After you take the initial reading the instrument will display the suggested trial weight angle in the upper right of the screen Section 11 Balancing Rotors vb7 and vb8 Instruments Only 131 ee eh Notes Angles are measured in the direction you designate as your Weight Orientation i e with rotation or against rotation If you are performing a dual plane balance you should only use this option in cases where each balance plane is physically close to its sensor and the two planes are separated from each other by a distance greater
121. nications Display Resolution Viewing area Backlight Communications with PC Graphic Grayscale LCD 480 x 320 pixels HVGA 4 6 x 3 1 117 x 79 mm White LED 4V 100 Cd m2 USB and Ethernet PROFLASH allows vb software to be upgraded Battery amp Charger Battery Type Custom Lithium lon pack 7 4 V 4500 mAh Operating time 10 hours Backlight on 60 second timeout Charger type Internal charging automatic control External Power pack 12 V DC 3 A output included in kit Charge rate 3 A nominal 3 hours for complete charge Mechanical Size 9 9 W x 5 8 L x 2 4 H 252 x 148x 60 mm Weight 2 7 Ib 1 2 kg Including battery and strap Environment Operating Temp 14 F to 122 F 10 to 50 C Storage Temp amp Humidity 4 F to 140 F 20 to 60 C 95 RH EMC EN61326 Ruggedness 4 1 2 m drop onto concrete IP65 Procedure 26 drops following MIL STD 810F 516 5 IV Revised 12 March 2008 While every effort has been made to provide the most accurate information we advise that information in this document may contain technical inaccuracies or typographical errors Commtest Instruments Ltd may at any time and without notice make improvements and or changes to the products described 164 Appendix Specifications we S vb8 Specifications Model vb8 Remarks Sensors Sensor input Sensors AC coupled range DC coupled ranges Connectors Analog to digital conversion S
122. of the settings shown on the right of the Screen press the keys beside the on screen icons e To change any of the settings shown at the bottom of the Screen press then press the keys beside the on screen icons Pressing keys causes the display to cycle through the available options or opens a sub menu where you can enter a value or choose a value from a list n ALT NEWER Spectrum Waveform Averages Store Units AT ALT Average Linear 6400 Lines S tenth Type 16384 Samp BRE ALT Average 1000 Hz Fmax Overlap oun 1 Hz Fmin ALT 6 4 s ENT ration Window Hanning 16 Pus ALT Sensor CH1 Accel 100mV Tach 4 Velocity Setup CH2 Accel 100m s DEF Trigger Pressing lets you change the measurement setup e f a sub menu opens make your changes then press This will apply your settings and return you to the previous menu where you can change further settings if required Section 4 Analyzing Measurements Onsite 41 RaM To select a different sensor press then press E Sensor Setup Press the Change Sensor key opposite your chosen measuring channel then use the left hand arrow keys to highlight a sensor and to select it Press the left hand arrow Ei beside your chosen channel to enable it then press twice to begin measuring Working with Charts You can display a separate on screen chart for each measurement channel This allows you to watch multiple live measurements at the same time freeze
123. om the Instruments dropdown list e Select which folders you wish to transfer by ticking the checkboxes beside their names Click Send near the bottom right of the window to begin transferring your folders e When the transfer is complete click Close Re sending Updated Folders Normally you will create all your machines in the Ascent software and send them to the instrument once only However if you add or change a route machine or parameter set in the software you will need to re send that folder to the instrument so that it can update to include your changes Each time you re send an existing folder from the Ascent software the send process will overwrite the folders contents in the instrument Any machines routes and parameter sets etc that you Section 8 Sending and Receiving Information 93 RaM have added or deleted in the software will also be added or deleted in the instrument In addition all stored recordings in the instrument are also deleted This is designed to free up instrument memory and save you the task of manually deleting recordings and machine definitions etc Keeping stored recordings If you wish to keep any recordings stored in the instrument re name the folder either in the instrument or the software before re sending The instrument will treat this as a new folder so will not overwrite the contents of the existing folder Keeping baseline recordings in the instrument If a recording is m
124. or with certified input entity parameters Vmax z 5 2V max 2 53 3 mA Pmax 2 277 mW Li 22 8 mH Los Ci 830 pF Ccsbie Any externally powered sensor with certified output entity parameters Voc lt 30V sc lt 100 mA la Leable Ca 2 2 nF Conte Ethernet USB Charger OFFICE CONNECTORS CH1 4 TACH FIELD CONNECTORS vbX Instrument Battery pack BATTO206 7 4 V 4500 mA Hr Li Ion Do nct recharge or change in hazardous locations Warnings Recharge or change battery only in a non hazardous area Use USB or Ethernet only in non hazardous area Substitution of components may impair suitability for Class I Division 2 No revisions of this drawing are permitted without CSA approval If the sensor mode is not specified any sensor certified for the location may be used provided that the senor entity parameters meet the above conditions and the final installation meets also the individual installation requirements for each specified sensor instruments ltd Dpreweng Net PO Box 9297 Christchurch New Zealand Tel 64 3 374 2337 Fax 64 3 374 2339 CIL2100VBX vbX INSTALLATION CONTROL DRAWING FOR HAZARDOUS LOCATIONS 5 May 2008 Revision 1 8 Section 1 Introduction vb eoe Instrument Connections The top panel of the instrument is equipped with the following connection interfaces 1 Ethernet port Connects to a standard 8P8C RJ45 male plug terminator
125. or output swing 80 g e g for reading prox probe gap Safety feature Break free inline connector 2 2 mA required for IEPE ICPG type accelerometer Tachometer Sensor Laser sensor range Other Sensor types supported Power supply to sensor TTL Pulse rating Keyphasor threshold Speed range Laser sensor with reflective tape included in kit 10 cm to 2 m nominal Contact TTL pulse Keyphasor amp 6 V to 8 V 50mA 3 5 V 4 mA min 28 V 5 mA max off state 0 8 V 13V 1V 10 RPM to 300 000 RPM 0 5 Hz to 5 kHz Sensor triggers on beam reflection Dependent on size of reflective tape vb has optically isolated input Battery voltage with current limit Parameter Indication Maximum levels Dynamic signal range Harmonic distortion Units Magnitude amp Cursors Accuracy Frequency response gt 1000 g 10 000 m s2 gt 1000 in sec 25 000 mm s gt 100 in 2500 mm gt 10 000 Amps gt 95 dB typical at 400 line resolution Less than 70 dB typical g or m s2 in s or mm s mil or mm or um adB vdB Amps Overall RMS value dual cursors harmonics 196 0 1 dB 0 1 dB from 10 Hz AC or 0 Hz DC to 15 kHz 3 dB from 1 Hz AC or 0 Hz DC to 40 kHz Effective limit is sensor sensitivity and output voltage Other distortions and noise are lower 0 peak peak peak or RMS Auto scale by 1000x when required US amp SI options for both adB amp vdB Digital readouts on chart For DC level F S amp
126. ork address to communicate Normally it will not need to be changed However it is possible that this address may interact negatively with other devices on a network This conflict may result in other network connections being lost while the instrument is connected to your computer To resolve this conflict change the USB or Ethernet network settings in the instrument and Ascent program Notes Your changes will only take effect once the instrument hardware has been reset Section 14 Troubleshooting 155 r RaM If you change the network address you must change it in both the instrument and software so that they can communicate this does not apply if you are only changing the last digit of the IP address Setting the USB Network Address e From the instrument s Main Menu press LO Options then Network e Press 27 USB and use the number keys to enter your new IP address netmask and gateway Press enter each item after you e Press 9 E to reset the instrument hardware and apply your changes e Connect the Commtest supplied data transfer cable to the USB ports of the instrument and computer and power up the instrument e n the Ascent program select Edit gt Manage gt vb Instruments e Double click the instrument from the list of those available If no instrument is shown see the Ascent Reference Guide for instructions on adding your instrument to Ascent e Enter the new IP address into the IP address field
127. orking with large numbers of machines press gt to collapse the displayed machine structures This will speed up navigation as you can move the selection bar from machine to machine rather than having to scroll through each individual parameter set location and point Record Review LITER Manual Save Warn Move the selection bar in the direction indicated Move the selection bar to the top of a single column list Move one column to the left in a multi column list Move the selection bar to the bottom of a single column list Move one column to the right in a multi column list Expand the highlighted machine structure to show its points locations and parameter sets Move to the right hand side of the screen in a split screen menu T Collapse the highlighted machine structure so that only the top level is visible Move to the left hand side of the screen in a split screen menu 20 Section 2 Instrument Basics vb eoe Selecting an Option from a List When there are a large number of choices available they will display in list format On screen arrows allow you to scroll up down or across a multi column list by pressing the arrow keys e To select an option from a list use the arrows keys to move the selection bar until your option is highlighted then press to select that option Example e From the Main Menu press Measure e To select Demod Spectrum press 1 or repeatedly to highlight
128. ow which sensor is being used and will offer you the appropriate measurement unit and overall scaling options for on screen display If you unplug a sensor in order to take a different type of measurement e g swapping an accelerometer for a current sensor you will need to assign this new sensor to the channel e From the Main Menu press o Options Section 5 Setting Measurement Options 57 Press E Sensor Setup then press Change Sensor opposite your chosen measuring channel If this is new sensor that has not yet been defined in the instrument you will need to create a sensor definition before you can assign it to a channel See Defining and Editing Sensors on page 116 Use the arrow keys to highlight a sensor then press to assign it to your channel Sensors Sensitivity Level Accel 100mV g Accel 100mV g To enable the channel for measuring press the left hand key beside your chosen channel The text will change from to Enabled to indicate that this channel can now be used to take measurements Press twice to return to the Main Menu Multi channel measurements To take simultaneous measurements follow the procedure described previously and enable as many channels as required Explaining Spectrum Parameters Fmax The Fmax is the maximum frequency displayed on the spectrum i e the frequency range starting from zero over which vibration amplitudes are displayed 58 Section 5
129. p Section 3 Using Sensors 31 vb LEMO To attach a LEMO triple BNC adapter line up the red dot on the LEMO connector with the red line on the instrument socket and insert Remove by firmly gripping the connector and pulling away from the instrument without twisting Warning Do not remove the LEMO connector by pulling the sensor cable This may damage the cable Always remove by gripping the end connector Sensor Inputs Input vb5 vb8 BNC 1 Channel 1 V V BNC 2 Channel 2 i LEMO 1 Channels 2 4 V LEMO 2 TACH V V Fitted but blanked off and disabled Mounting Sensors Your choice of sensor mounting will affect the accuracy and therefore the repeatability of vibration measurements For walk around data collection accelerometers are usually mounted using the supplied magnetic base However for optimal high frequency results they can be stud mounted as described in Permanent Mounting page 34 You can also apply these instructions to velocity sensors You should mount tachometers displacement sensors prox probes and current sensors according to the manufacturers instructions 32 Section 3 Using Sensors we S Setting up the Accelerometer Plug the accelerometer connector into an instrument BNC sensor input or into a triple BNC adapter connected to the instrument if using a vb6 or vb8 instrument Now screw the accelerometer into the magnetic base and attach it to the measurement poin
130. play the newest recording press Review Selected Recording To display older recordings press once more to select the Review column a black border will appear around the column indicating that you can now move up down through the recordings Use the left hand arrow keys to select a recording then press to display your selection Note An asterisk beside a recording indicates that more than one recording type is contained within the record spectrum and waveform or 6Pack combination measurements for example 88 Section 7 Taking Recordings Offsite Analysis w eoe g Record Review 01 11 2008 09 35 18 Vel SpectWfm 1000Hz Auto Save Warn i The black border indicates all recordings can be reviewed 1 When a recording is displayed you can use cursors harmonics and zooming to better analyze the data Press to display hint labels and refer to the appropriate topics in Analyzing Measurements page 42 for details of how to use cursors and zooming 2 When you have finished reviewing the recording press to return to the Review column from where you may select another recording for review or press and hold to return to the Main Menu 3 To select recordings from a different parameter set location or machine press to navigate back to the machine list in the Record column A black border will appear around the Record column indicating that you can now select items 4 Repeat steps 2 4 to rev
131. ported Sensor Types The following table summarizes the sensitivities and types of measurement that can be taken by each sensor supported on each instrument model vb5 Sensor Type Sensitivity Measurement Types Acceleration Accelerometer mV g 0 1 10 000 Velocity Displacement 30 Section 3 Using Sensors we S vb6 vb7 and vb8 Sensor Type Sensitivity Measurement Types Acceleration Accelerometer mV g 0 1 10 000 Velocity Displacement mV in s 0 1 10 000 Velocity Sensor m s 0 34 90 55 Velocity Displacement Sensor or prox probe mV mil 0 1 10 000 mV um 0 34 90 55 P sPlacement Current Sensor mV amp 0 1 10 000 Current You can define your sensors either in the Ascent software or in the instrument For information on how to define a sensor using the instrument see Defining and Editing Sensors page 116 Connecting Sensors to the Instrument Sensors are connected to the instrument via BNC and in the case of vb6 and vb8 instruments seven pin LEMO socket Use the provided triple BNC adapter LEMO breakout cable to connect channels 2 through 4 if using these channels on a vb6 or vb8 instrument BNC left seven pin LEMO right Note The triple BNC adapter s three BNC inputs are numbered to indicate channel BNC Attach the sensor cable plug to the BNC connector s by inserting and gently turning clockwise Remove by turning in an anti clockwise direction then pulling u
132. r flow rates These process input values are entered manually using the keypad rather than by attaching a sensor to a machine The collected information can be transferred to a PC along with your normal measurements If you include keypad entries in a route the instrument will prompt you when to enter the values Keypad entries can also be used as on screen reminders to perform machine checks such as checking temperature and pressure etc Create keypad entries as part of a recording route then transfer these to the instrument 16 Section 1 Introduction we S e Enter the values for each keypad entry item when prompted by the instrument Jie J e Transfer the collected values and recordings to a PC for analysis Section 1 Introduction 17 ne vb Section 2 Instrument Basics This section describes how to perform basic functions on your instrument You will learn to e Power up the instrument and turn it off Navigate menus and select options Enter and edit characters and punctuation Replace the on screen icons with hint labels Display detailed help Powering On Off e Press io to power up the instrument or turn it off The following menu displays at power up vb S N 40000 Firmware v3 0 1 Record C m Record Reviow Description My Analyzer Folders fyb Default Folder 100 EN 11 48 42 RERO sites 2010 02 25 Main Menu Balance The Main Menu displays detail
133. re is a stationary point between the sensors Section 6 Measurement Types and Their Uses 75 b Resonance variable speed machines To investigate resonance you can vary the machine speed A phase shift of 180 will occur as machine speed is increased from below a resonance to above a resonance A 90 phase shift will be present at the resonant frequency If a machine is running close to resonance any small speed variation will cause large phase shifts Resonance at a bearing Look for a change from the normal 90 phase difference in the horizontal and vertical directions at 1X When a natural frequency is close to 1X in either direction that phase angle may be well be on the way towards its 90 phase change so the two phases may no longer be 90 apart assuming that the structure has a different natural frequency in either direction Eccentric belt pulley A high amplitude peak will appear at 1X the running speed of the pulley Look for a phase change of either 0 or 180 between the horizontal and vertical readings which indicates straight line motion instead of the usual 90 difference This symptom is similar to bearing resonance described above but in this case the direction of maximum vibration will be in line with the two belts Mechanical looseness High amplitude peaks will show up at many multiples of the running speed and sometimes even multiples of 0 5X running speed e g 1 5X 2 5X etc Look for fluctuati
134. reen e To take the next recording press This will either return you to the Record Review Menu or if you have selected a location with multiple parameter sets underneath it begin taking the next recording Free Run Manual Save The instrument will continuously record the signal and update the on screen display e To stop measuring press To save the recording press e To record the next parameter set without saving this recording press This will either return you to the Record Review Menu or if you have selected a location with multiple parameter sets underneath it begin taking the next recording Section 7 Taking Recordings Offsite Analysis 87 I Reviewing Recordings To review recordings immediately after taking them you can set the instrument s save option to Record Review to do this from the Main Menu press Record Review then press repeatedly until Record Review Warn displays in the lower right hand corner of the Screen To review stored recordings 1 2 From the Main Menu press EI Record Review To select a recording for review use the left hand arrow keys to scroll up and down and press Expand Navigator repeatedly to expand out a machine so that its locations and parameter sets become visible When you highlight a parameter set its associated recordings will appear in the Review column The newest recording is highlighted at the top of the column To dis
135. rement locations Virtually unlimited recording storage No limits are applied 50 character names Display amp Communications Display Resolution Viewing area Backlight Communications with PC Graphic Grayscale LCD 480 x 320 pixels HVGA 4 6 x 3 1 117 x 79 mm White LED 4V 100 Cd m2 USB and Ethernet PROFLASH allows vb software to be upgraded Battery amp Charger Battery Type Operating time Charger type Charge rate Custom Lithium lon pack 7 4 V 4500 mAh 10 hours Internal charging automatic control 3 A nominal Backlight on 60 second timeout External Power pack 12 V DC 3 A output included in kit 3 hours for complete charge Appendix Specifications 161 es Specifications Model vb6 Remarks Mechanical Size Weight 9 9 W x 5 8 Lx 2 4 H 252 x 148x 60 mm 2 7 lb 1 2 kg Including battery and strap Environment Operating Temp Storage Temp amp Humidity EMC Ruggedness 14 F to 122 F 10 to 50 C 4 F to 140 F 20 to 60 C 95 RH EN61326 4 1 2 m drop onto concrete IP65 Procedure 26 drops following MIL STD 810F 516 5 IV Revised 12 March 2008 While every effort has been made to provide the most accurate information we advise that information in this document may contain technical inaccuracies or typographical errors Commtest Instruments Ltd may at any time and without notice make improvements and or changes to the product
136. rument Although this book makes use of common vibration analysis and balancing concepts it is not intended as a comprehensive guide or training manual Please ensure you have the relevant knowledge and experience to carry out the procedures described It is essential to follow all appropriate safety precautions when working near rotating machinery Product and support feedback If you any have questions that are not answered in this reference guide or would like to make a suggestion please contact us at www commtest com Standard Features e DSP for fast accurate calculations e 24 bit A D converter providing high precision measurements e Displacement velocity acceleration and current measurements vb6 and vb8 instrument models also support voltage and user defined measurements e Frequency and time domain measurements e 1 GB non volatile flash memory providing almost unlimited recording storage e Time and date stamped recordings e vb firmware upgradeable using Commtest PROFLASH Temperature compensated graphical LCD Liquid Crystal Display with 480 x 320 pixels and white LED backlight 4500 mAh custom Lithium lon battery pack Battery charger USB or Ethernet interface for PC communications Ascent Windows based vibration analysis software Section 1 Introduction 1 b e Tachometer and Keyphasor amp input for speed and phase measurements Keyphasor not supported by the vb5 instrument model e Balancing ana
137. rument However there are many strobes on the market with different types of output signal and connectors If your strobe light has a BNC connector and gives a TTL output 0 to 5 V you can purchase a suitable cable with a LEMO connector from Commtest Instruments Ltd via your distributor For other types of connectors and signals please consult the FAQ Frequently Asked Questions articles on the Commtest website www commtest com Section 3 Using Sensors 37 Section 4 Analyzing Measurements Onsite This section describes how to take measurements and perform onsite analysis You will learn to Take a measurement Change how a measurement is displayed Perform analysis using cursors and zooming Set a measurement s RPM Store a measurement Tips for Taking Measurements You should always take measurements using the machine operating mode that is typical for that machine using a typical load and running speed This will ensure that the loads on the components such as bearings are the same as those that define their wear For multi operating mode machines it is best to take measurements when the loads on the bearings are at a maximum and to take all future measurements in the same mode When taking the measurement try not to lean on the machine and do not put heavy objects e g heavy tool boxes on it since this will change the vibratory behavior of the machine If there are machines operating nearby that might a
138. s that are whole number multiples of the frequency or time value indicated by the main cursor Turning harmonics off Press then press L8 Clear Cursors to remove all harmonics and sidebands Zooming Zooming allows you to take a closer look at a specific area of interest on a chart Chart zoom and expansion options Magnifying glass icons on the left of the screen indicate that zooming options are available If the magnifying glass icons are not visible press toggle them on Press to display hint labels for zooming and expansion options Zooming horizontally across the chart To expand the peaks of a spectrum or waveform use the right hand arrow keys to move the cursor to the position of interest and press X Axis Zoom repeatedly to zoom in on the cursor position by a factor of two per key press The more spectral lines or waveform sample points used the more times you can zoom Zooming vertically and horizontally To see low amplitude peaks more clearly move the cursor to the position of interest and press Y Axis Zoom to zoom in by a factor of two per key press Press 3 X Axis Zoom to expand the frequencies on either side of the cursor Section 4 Analyzing Measurements Onsite 45 b Zooming out e Press X Axis Expand repeatedly to zoom out horizontally and Ga to zoom out vertically Viewing Multiple Charts When you measure more than one channel simultaneously or display both a spectrum and wave
139. s described 162 Appendix Specifications we S vb7 Specifications Model vb7 Remarks Sensors Sensor input Sensors AC coupled range DC coupled ranges Connectors Analog to digital conversion Sensor excitation current Sensor detection 2 channels Accelerometer Velocity Displacement Current 16 V peak peak 0 V to 20 V 10 V to 10 V 20 V to 0 V 2 x BNC CH1 CH2 24 bit ADC 0 mA or 2 2 mA configurable 24 V maximum Warns if short circuit or not connected Simultaneous sampling Allows for 8 V sensor output swing 80 g e g for reading prox probe gap Safety feature Break free inline connector 2 2 mA required for IEPE ICPG type accelerometer Tachometer Sensor Laser sensor range Other Sensor types supported Power supply to sensor TTL Pulse rating Keyphasor threshold Speed range Laser sensor with reflective tape included in kit 10 cm to 2 m nominal Contact TTL pulse Keyphasor amp 6 V to 8 V 50mA 3 5 V 4 mA min 28 V 5 mA max off state 0 8 V 13V 1V 10 RPM to 300 000 RPM 0 5 Hz to 5 kHz Sensor triggers on beam reflection Dependent on size of reflective tape vb has optically isolated input Battery voltage with current limit Parameter Indication Maximum levels Dynamic signal range Harmonic distortion Units Magnitude amp Cursors Accuracy Frequency response gt 1000 g 10 000 m s2 gt 1000 in sec 25 000 mm s 100 in 2500 mm 10 000 A
140. s of your initial and trial readings the balance reading and any trim balances Balancing Report Plane A CH1 g WR um rms Initial 9I 3272 Saving the balance job e From the Balancing Report Menu press o Save Balance Job Select or create a machine to save this balancing job to then press The balance job will be saved to this same machine in the Ascent database the next time you transfer the containing folder to a computer To print the report directly from the instrument press Print Report see Printing from the Instrument page 148 for setup details Note You can save multiple balance jobs to a single machine to create a history of balancing Section 12 Balancing Walk through vb7 and vb8 Instruments Only 145 Section 13 Utilities This section describes how to use the utility functions of your instrument You will learn to Set the instrument date and time Synchronize the instrument date time with the Ascent software Adjust the LCD display Change the LCD interface language Set up direct printing from the instrument Manage the battery pack Release instrument memory Upgrade the instrument s firmware Setting the Date and Time You can set the time in 12 hour or 24 hour format Recordings are date and time stamped according to this clock The instrument adjusts the date and time automatically to accommodate leap years and daylight savings You can also select your local time zo
141. s such as the amount of charge remaining in the battery today s date and time the instrument serial number firmware version the instrument s user defined description and the name of the currently selected folder e Along key press on E will always return you to the Main Menu 18 Section 2 Instrument Basics we S Note Once powered up and with a battery state above 25 pressing the button will place the instrument into Sleep Mode not Complete Powerdown Mode If the battery state falls below 25 charge the instrument will enter Complete Powerdown Mode immediately when turned off Navigating Menus e To navigate menus press the key that displays the name of the task you want to perform e g to take a measurement from the Main Menu press Measure Press 2 to take measurements 8 _ Measure x lk Measure ME Press 8 to review recordings Record i a Record Review Description Review CAET Default Folder Balance Returning to a Previous Menu e To return to a previous menu press If you have opened several sub menus pressing this key will return you to the original menu A long press will return you to the Main Menu Section 2 Instrument Basics 19 Using Navigation Keys and Icons Use the keypad arrows and on screen arrow icons to navigate backwards forward through menus move up down and across lists and expand collapse structures containing other items When you are w
142. s to recordings e Create and display baselines Walk through Taking Recordings The following instructions assume that you have already created your machine structures and have assigned parameter sets to the measurement locations 1 Connect your sensors to the appropriate measurement locations If you are taking tachometer readings set up the tachometer also 2 Ensure the folder containing the machines you want to monitor is selected the name of the currently selected folder will display on the Main Menu beside the Folders label If you need to select a different folder press Folders and use the arrow keys to highlight your choice then press This loads the folder and all its machines into current memory and returns you to the Main Menu 3 Press EI Record Review to display the machines within this folder If necessary select Save by pressing for a recording this should normally be set to Auto Save Warn Refer to Recording Save Options on page 87 for more information Section 7 Taking Recordings Offsite Analysis 85 4 Use the left hand arrow keys to scroll up and down and press Expand Navigator repeatedly to expand out a machine so that its points and locations become visible Record Review Vertical We Auto Save Warn 5 To take an individual recording highlight the parameter set that you wish to record If you want to record all parameter sets at a location
143. sing a key causes the instrument to perform the task shown beside that key For example in the following picture pressing will cause the Y Axis of the on screen chart to expand 24 Section 2 Instrument Basics Y AXIS y Expand X Axis Zoom Chart menu before pressing However in many menus one key can perform two functions When this is the case a small icon will appear at the top of the screen see the arrow in the previous picture Pressing the key causes a different set of options to appear The following picture shows the same chart menu after pressing this key Y Axis Log Y Axis Fixed Chart menu after pressing Entering Alphanumeric Characters Names can be up to 50 characters long and contain a mix of upper case and lower case letters spaces numbers and punctuation To enter letters and numbers use the instrument keys in the same manner as a multi tap type mobile phone pressing the keys repeatedly to cycle through the characters until you reach the one you want to use For example to enter the number 7 press four times Pressing a different key causes the cursor to immediately go to the next space if you need to use a character that is on the same key as the previous character pause for a moment until the cursor moves forward so that you don t overwrite your text Section 2 Instrument Basics 25 b Example To rename the currently selected folder to FANS e From th
144. steps are indicated with this symbol You will learn to Take initial imbalance measurements Set up and apply trial weights Balance the rotor using correction weights Perform trim balancing to further reduce the vibration Save and review your balancing job Produce balancing reports Step 1 Set Up a New Balance Job From the Main Menu press E Balance then press s New Job to clear any previous settings Press EI Setup Use the options in the Balance Setup Menu to choose the required settings for your balancing job The following screen shows the settings that were selected for this walk through 140 Section 12 Balancing Walk through vb7 and vb8 Instruments Only vb Balance Setup 60 Balance 18 Planes Weight Orientation Sensors Averages fi Standard Tach Type DENG optional 9b MEI Information m Lin Dist mm rms Store Units Automatic Step 2 Take an Initial Reading Stop the machine Attach the sensor to the bearing housing closest to the rotor For best results attach it in the radial direction in which the machine is most flexible and vibrates the most Attach a sensor to each of the bearings supporting the rotor It is not important how the sensors are paired or which sensor is attached to which end Set up the tachometer see Setting up the Tachometer on page 34 Start the machine and let the rotor settle to its normal operating speed Since the vibratio
145. surement types for each recorded channel gt High Frequency Spectrum High Frequency Waveform Low Frequency Spectrum Low Frequency Waveform Demodulation Spectrum Y Y ON ON WV Demodulation Waveform e From the Main Menu press 2 Measure then press 8 6Pack e Use the left hand arrow keys to select a parameter set or press to create a new one and set the parameters as required e Press n Spectrum Waveform HF Fmax Dmax or Demod Band Dmin then use keys f and to select the measurement types you wish to record e Press to begin sampling 68 Section 6 Measurement Types and Their Uses we S Note The six recording types that comprise a 6Pack measurement are saved as a single recording for each channel not as individual High Frequency Low Frequency and Demodulation Streamlined parameter settings The following simplifications have been applied to 6Pack measurements e The sensor type must be Accelerometer e The High Frequency and Demodulation measurements are measured in Acceleration units only e All spectra and waveforms have the same resolution maximum 800 lines 2048 samples e The Demod Bandwidth upper limit is automatically set to equal the HF Fmax e Averaging type number and overlap are the same for all spectra e Fmin and Demodulation Fmin are the same e Fmax and Demod Fmax are the same Note There are many charts displayed when using the 6Pack feature especially when measuring with t
146. t Section 13 Utilities 147 b e From the Main Menu press o Options e Press Language e Use the left hand and 27 arrow keys to select a language from the list of those available The two windows at the bottom of the screen demonstrate how the language selected will appear e Press to save your language selection Printing Directly to a Network Printer vb7 and vb8 instruments can be configured to print balancing reports directly to PCL enabled network printers Configuring this feature requires an in depth understanding of your network and printer configurations If you are unfamiliar with either you may require assistance from your network administrator or technical support department Printing can also be configured using the Ascent software e Connect the instrument to your printer or network switch hub using an Ethernet cable Turn on your network printer e From the Main Menu press o Options e Press Ell Network then Printer e Press 2 Printer Type to toggle between printer types Available options are Postscript PCL and Disabled The Disabled setting will disable the print function Note PCL is the most widely supported printer language Check your printer documentation to determine which option is most appropriate e Press EI Printer Address and enter the printer s IP address Press to save and return to the Printer Settings Menu The default port is always 515 148 Section 13 Utilities
147. t using these guidelines Attach the accelerometer to a sturdy rigidly mounted and non flexible structure where vibration from the rotating part of the machine will be accurately transmitted Do not attach sensors to sheet metal guards or any machine structure which is not closely coupled to the source of vibration in the spinning rotor as the vibration of such a structure will be different to the vibration source The attachment structure must be at least 10 times heavier than the accelerometer itself Do not mount the accelerometer on lightweight motors or similar parts as the weight of the accelerometer will distort the vibration signal Use a smaller accelerometer for small structures Attach the accelerometer as closely as possible to and in line with the centerline of the bearings in order to avoid distorted signals The mounting surface should be flat and smooth where the accelerometer makes contact Attach the accelerometer using the supplied magnetic accelerometer base or a threaded stud on the machine surface The accelerometer should not move independently of the machine part it is attached to Ensure the accelerometer is oriented correctly as vibration can differ greatly with respect to direction If you are undertaking an ongoing study of a particular measurement point always attach the accelerometer at exactly the same position used for previous measurements mark the position if necessary Section 3 Using
148. tart the machine and allow it to operate under its normal load and running speed From the Main Menu press 2 Measure Section 4 Analyzing Measurements Onsite 39 vb Measure Spectrum Waveform Demod Bump Test LESI Time Sync Avg Select your measurement type by H the arrow keys to move the selection bar then press or by pressing the quick access buttons to the right of the screen The measurement default settings are displayed on screen You can change any of these defaults before taking a measurement See sub heading Changing the default settings at the end of this topic To start the measurement press The instrument and sensor will take a short time to settle before measuring begins Measurements are taken in free run mode which means that the signal continually updates on screen until you stop the measurement SpectWfm 1000Hz 0 4 mum acm CH1 CH2 40 Section 4 Analyzing Measurements Onsite we S e To stop the measurement press You can now analyze the measurement on screen including displaying the amplitude of spectral peaks and identifying harmonics see Analyzing Measurements OR e To N ub the measurement and exit without saving press OR e To save the measurement press EI and select an existing machine location or create a new one see Saving Measurements on page 51 Changing the default settings e To change any
149. than the rotor diameter In particular for overhung rotors this option should only be used for single plane balancing on the closest bearing and balance plane to help with reducing the static imbalance only The CH2 or CH4 sensor and weight reference mark must be in line with those of CH1 or CH3 Averages Averaging the out of balance values can increase the accuracy of your measurements allowing the instrument to make more precise recommendations for the size and placement of balance weights A higher number of averages produces more accurate measurements but lengthens the recording time accordingly Machine Information Entering machine information is optional It allows you to specify some of the physical properties of the machine being balanced Rotor Weight Diameter and Speed Entering the rotor s weight diameter and speed helps the instrument to calculate the appropriate size and placement of trial weights based on your machine s physical properties The aim is to calculate a trial weight which will cause a significant change from the initial reading e From the Balance Setup Menu press Machine Information and use the on screen options to enter your values If you need to enter a decimal point press then 132 Section 11 Balancing Rotors vb7 and vb8 Instruments Only we S e f you need to change a measurement unit e g for rotor weight or diameter return to the Balance Setup Menu and press E Weight Lin Dist Chan
150. the 1X peak e Press n or repeatedly to move the cursor to the 1X peak e Press then Set RPM The frequency of your selected peak will be displayed Enter RPM 50 1 999999 250 500 750 e Press to save this frequency as the RPM value Note If a tachometer is connected to the instrument the instrument will use the RPM from this rather than any entered value Viewing Orders When orders are displayed the frequency axis of a spectral chart is labeled in orders of running speed instead of in Hz or CPM This allows you to see how closely spectral peaks correspond to the running speed of the machine In addition you can move a cursor to a peak of interest the exact number of orders at that frequency will appear at the top right of the screen 50 Section 4 Analyzing Measurements Onsite we S e With a spectral chart displayed set the RPM as described in the previous topic and press then EI X Axis Orders e To de activate orders repeat the previous step Viewing Revolutions When Revs are displayed the time axis of a waveform chart is labeled in revolutions of running speed instead of your regular measurement units e With the waveform chart displayed set the RPM as described previously The bottom axis will update to display revs SpectWfm 1000Hz 4 4 77 RPM_ View 00 CH1 0 2897 m s rms 4 89m s tp lud 2 Revs i
151. the Ascent database From the Main Menu press EI Record Review Press 9 to display the Note Menu then press New Note In the Note Entry Menu press and enter your text Press to enter punctuation and to enter a space and then to delete characters Press to save the note Editing Notes From the Main Menu press EI Record Review Press 9 to display the Note Menu then press Create New Note In the Note Entry Menu press EI Edit Note and enter your new text If the note is attached to any items you will be prompted to create a new note Press LI to enter punctuation and 9 to enter a space Press to save the note Attaching Notes You can attach notes to the machines points and axes within the machine structure 120 Section 10 Creating Editing and Deleting Items we S Use the arrow keys to highlight the item you want to attach the note to Press C to display the Note Menu then press Create New Note Select a note then press to attach it to your chosen item or to create a new note If you want to attach additional notes press again and repeat this process Press to return to the previous menu The note icon will appear beside your chosen item to indicate that a note is attached Viewing Notes To view a note use the arrow keys to highlight the item with the note attached then press Notes Removing Notes Removing a note only detaches it from a selected item The note will remain in the Note Entry
152. to or manual scaling Dependent on Fmax and number of lines Increases sampling time proportionally From 125 Hz to 1250 Hz up to 16 kHz to 20 kHz Waveform Display Number of samples Time scale Time synchronous averages Long time waveform 1024 2048 4096 8192 16 384 10 ms to 256 seconds 1 2 4 8 16 32 64 128 Up to 40 kHz Fmax 28 M samples Or orders based from 1 to 999 revs Only available when tachometer triggered Logging Features Output formats Data storage Data storage structure Max Folder size Direct print reports vb screen transfer to Ascent PC based software 1 GB non volatile flash memory Folders machines points locations routes 10 000 measurement locations Via Ethernet to PCL enabled printer Virtually unlimited recording storage No limits are applied 50 character names Balancing Planes Speed range Measurement type Weight modes Remove trial weights Manual data entry Storage Channel selection 2 planes 2 sensors 30 RPM to 60 000 RPM Acceleration velocity displacement Angle 0 to 360 fixed position circumference arc Yes No Yes Against machines in data structure Single or dual channel e g weights on fan blades linear dist around circumference Automatic recalculation Allows re entry of previous balance jobs No limits are applied Appendix Specifications 163 RaM Specifications Model vb7 Remarks Display amp Commu
153. troduction we S Recording Routes You can take vibration recordings for all monitored machines then transfer these to a PC for analysis The instrument guides you through a pre defined data recording sequence known as a route which you create on a PC then transfer to the instrument see the Ascent Software Reference Guide for instructions Recording routes are particularly useful if you routinely monitor a large number of machines e Create a recording route on a PC then transfer it to the instrument e Collect data for each item on the recording route as prompted by the instrument Zu 2 e Transfer the collected data to a PC for later analysis Balancing You can analyze and correct rotating mass imbalance problems in situ A rigid rotor can be balanced in one or two planes Note Balancing functions are available on the vb7 and vb8 instrument models only e Take an initial measurement of the imbalance 42 Section 1 Introduction 15 vb Attach a trial weight to the balancing plane and take another measurement For dual plane balancing do the same for the second plane Attach correction weights to the balancing planes as recommended by the instrument EP EN guq Take a measurement in each plane to confirm that the rotor is balanced Any residual imbalance can be removed via trim balancing Keypad Entry You can create keypad entries to define process input values such as current o
154. ude of vibration and also the phase angle The amplitude shows the severity of the imbalance and the phase angle indicates the geometry of the imbalance i e the location of the heavy spot Setting up the Tachometer page 34 contains information on how to set up the tachometer to measure phase angles Suggested Trial Weight Mass and Location The instrument can assist with balancing operations by calculating an appropriate trial weight mass and location for you Please refer to topics CH Position and Reference Mark for help with calculating the trial weight location and Machine Information for help with calculating the trial weight mass Manually Entering Balancing Information You have the option to manually enter amplitude and phase values for the initial trial and trim readings This allows you to gt Interrupt the balancing process without saving the values then re enter them later and continue balancing gt Experiment with different trial weight masses and placements to see the effect on the imbalance without having to attach weights to the machine gt Calculate the effect of further trim balances gt Change the units used in a final balancing report by selecting different units then re entering the collected values 126 Section 11 Balancing Rotors vb7 and vb8 Instruments Only we To enter a value manually work through the balancing setup process as normal then press ME to take a reading The icon wil
155. ve LED indicators located on the instrument s front panel indicate the instrument s current state and warn of measurement problems Danger Power supply Alert Charging ok Instrument LEDs Illuminates when power is supplied to the Bowe evpo pm eq instrument from the power adapter Indicates that the instrument battery is Charging RED charging llluminates when a DSP or critical error Danger RED occurs or when a measurement is less than 2596 or greater than 20096 of the preset baseline value llluminates when a measurement is less Alert AMBER than 5096 or greater than 15096 of the preset baseline value Indicates that a measurement is being or OK GREEN has been collected successfully without an error or alert triggered See the Working with Baseline Recordings page 90 section for details Section 1 Introduction 11 b Charging the Battery Pack Warning Before charging the battery pack ensure that the power transformer used is an approved power adapter 12 V 3 A output center positive Do not use the plug pack transformers supplied with previous Commtest portable analyzers such as the vb1000 3000 or Profiler instruments The power adapter supplied in the kit provides the correct DC voltage e Connect the AC power adapter included with the instrument to a powered outlet 100 240 Volt 50 60 Hz Note The optional car adapter charging lead may also be used to charge the battery pa
156. we S Note To obtain your printer s IP address open your Printers and Faxes folder Start gt Printers and Faxes in Windows XP Right click the printer and select Properties Click the Ports tab Scroll down the list of ports until you see your printer it will have a checkbox selected beside it The IP address will be listed under the Port column e Press Queue Name and enter the printer s Queue Name then Note The Queue Name is a unique identifier sometimes known as a Printer ID Many printers have a factory configured Queue Name that can be found in the printer s user manual or printed on a label attached to the printer itself If the printer was configured by a Windows Printer Wizard the Queue Name may use the header IP_ followed by the IP address IP_192 168 1 1 for example e Press E Paper Size then select a paper sheet type using the left hand arrow keys and press e Press Print Test Page A test page will be printed if the instrument configuration is correct Adjusting Screen Contrast e From the Main Menu press LJ Options e Press nm LCD Contrast Backlight The screen displays a chart and text so that you can preview the effect your adjustments will make on the display e Use the Gi and keys to increase or decrease the screen contrast then press Turning the Backlight On Off The backlight consumes a relatively high level of power and will automatically turn off after a timeout period see Setting Backlight
157. wo channels See the Viewing Multiple Charts page 46 section for more information on multi chart layout options 6Pack Demodulation Processing 6Pack measurements use a slightly different Demod algorithm to that used when taking Demod measurements the classic algorithm The new algorithm performs enveloping around the high frequency impact events in much the same way a user does by eye when viewing a high frequency waveform By contrast classic Demod relies on rectification and low pass filtering to achieve a similar result The new algorithm works very well over a wide range of impact signals yet it uses far less computing power than classic Demod This allows the 6Pack system to operate at full 40kHz speed on 2 channels simultaneously providing twelve processed outputs The new algorithm has been carefully calibrated so its response to typical impacting signals is very close to that of classic Demod Section 6 Measurement Types and Their Uses 69 Rb Users should not see a marked difference when switching to the 6Pack method Demod Spectrum From the Main Menu press EM Measure then press Demod Use the left hand arrow keys to select a parameter set or press to create a new one and set the parameters as required Set the bandwidth first as this will determine the range of available Fmax values Press to begin measuring Tachometer Display Tachometer Display shows an updating readout of the machine speed It ca
158. x 79 mm White LED 4V 100 Cd m2 USB and Ethernet PROFLASH allows vb software to be upgraded Battery amp Charger Battery Type Custom Lithium lon pack 7 4 V 4500 mAh Operating time 10 hours Backlight on 60 second timeout Charger type Internal charging automatic control External Power pack 12 V DC 3 A output included in kit Charge rate 3 A nominal 3 hours for complete charge Mechanical Size 9 9 W x 5 8 Lx 2 4 H 252 x 148x 60 mm Weight 2 7 Ib 1 2 kg Including battery and strap Environment Operating Temp 14 F to 122 F 10 to 50 C Storage Temp amp Humidity 4 F to 140 F 20 to 60 C 95 RH EMC EN61326 Ruggedness 4 1 2 m drop onto concrete IP65 Procedure 26 drops following MIL STD 810F 516 5 IV Revised 12 March 2008 While every effort has been made to provide the most accurate information we advise that information in this document may contain technical inaccuracies or typographical errors Commtest Instruments Ltd may at any time and without notice make improvements and or changes to the products described 166 Appendix Specifications we S Index A Accelerometer drive current 5 116 sensitivity 30 setting up 33 specifying settings 116 adB 48 scaling 47 48 units 48 53 Amplitude scale 47 units 48 53 Amplitude and phase 76 AR against rotation 133 Averaging 60 132 exponential 60 linear 60 number of 60 overl
159. z to 5 kHz Sensor triggers on beam reflection Dependent on size of reflective tape vb has optically isolated input Battery voltage with current limit Parameter Indication Maximum levels Dynamic signal range Harmonic distortion Units Magnitude amp Cursors Accuracy Frequency response gt 1000 g 10 000 m s2 gt 1000 in sec 25 000 mm s gt 100 in 2500 mm gt 95 dB typical at 400 line resolution Less than 70 dB typical g or m s2 in s or mm s mil or mm or um adB vdB Amps Overall RMS value dual cursors harmonics 196 0 1 dB 0 1 dB from 10 Hz AC or 0 Hz DC to 15 kHz 3 dB from 1 Hz AC or 0 Hz DC to 40 kHz Effective limit is sensor sensitivity and output voltage Other distortions and noise are lower 0 peak peak peak or RMS Auto scale by 1000x when required US amp SI options for both adB amp vdB Digital readouts on chart For DC level F S amp AC measured at 100 Hz Acceleration and velocity From value measured at 100 Hz Spectrum Display Fmax possible ranges Fmin possible range Resolution Frequency scale Amplitude scale Window shapes Overlap Number of averages Averaging types Demodulation bandwidths 25 50 100 125 150 200 300 400 500 600 800 1000 1200 1600 2000 2500 3000 4000 5000 6000 8000 10 000 15 000 20 000 30 000 40 000 Hz 0 to Fmax 400 800 1600 3200 6400 lines Hz CPM Orders Acceleration velocity displacement

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