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ADASH Ltd.

Adash 4900 – Vibrio M

Further technical and contact information can be found at www.adash.com

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Advanced tests of acceleration measurement

Use the shaker and sensor if you are able to shake high frequencies. If your shaker system does not
allow it, use the signal generator and switch the ICP off. Contact your re-seller for information, how to
switch the ICP off. That information is not written in this manual.
You can make the frequency response and the amplitude response.
Use the amplitude 1g for frequency response test. Change the frequency from 500 to 12000 Hz and
draw the curve.
Set the 1.2kHz or higher for amplitude response. Change the amplitude from 0.1 to 10g and read
values.

Envelope demodulation test

The envelope value is RMS value. Do not use comparing with peak values. Switch the ICP off and use
the 8kHz pure sine signal with 1g (100mV) amplitude. The ENV should display approx. 1.33g.
When you use the A4801 Sensor Simulator do not switch off the ICP. Remember, that A4801
generates 0.5g only. That is why the ENV will display one half of 1.33g (0.66g).

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Содержание 4900 Vibrio Ex

Страница 1: ... Spectrum FFT analysis Measurement in frequency bands for bearing diagnostics Store data and perform route measurements Built in ISO 10816 limits Fault Source Identification and Diagnostics Tool Headphones for listening of vibration Built in Infrared Thermometer Built in stroboscope lamp Built in torch Detection of machine and bearing conditions Detection of machine speed Colour OLED graphic displ...

Страница 2: ...d accessories 13 Before You Start 14 Standards for vibration measurements 15 Adash Limit Values of Machine and Bearing Vibrations 16 ISO 10816 limit values 17 Classification according to machine type nominal power or shaft height 17 ISO Groups 1 4 classifications define the following types of machinery 17 Classification according to foundation 17 Evaluation ranges 17 Classification of vibration va...

Страница 3: ...asurement screen No 4 properties 44 Measurement screen No 5 properties 44 Measurement screen No 6 properties 45 Measurement screen No 7 FASIT properties 45 Measurement screen No 8 properties 45 Route measurements 46 Readings 48 How to evaluate the failure 50 Overall RMS values 50 Overall PEAK values 51 Spectrum 200 Hz Detection of Looseness 51 Time signal for bearing condition evaluation 52 Vibrat...

Страница 4: ...n according to 94 9 EC ATEX directive 60 Zones categories 60 Using of Instrument 60 Certificated accessories 61 Accelerometer AC90x 61 Baterie 61 Headphones 61 The unit sticker 62 Adash 4900 Vibrio MP proximity option 63 Switch On of Instrument 63 Screens 64 Speed enter 64 DC offset 64 Displacement in 1 1000Hz range 64 Spectrum 1000Hz or 2500Hz 65 Spectrum 200Hz 65 Time waveform in 1 1000Hz 65 Set...

Страница 5: ...s Vibration diagnostic allows checking the condition of all your machinery You will be informed early about potential failure before the machine gets damaged and you will be able to order only real specific required maintenance instead of expensive overhauls The periodical measurements will allow you to keep your machines in good health ...

Страница 6: ...mples time signals temperature rotation speed strobe scope In addition it incorporates a strobe scope handy inspection torch and stethoscope The A4900 caters to ISO 10816 3 with expert rules covering machine health vibration levels that identify the prime machinery faults Unbalance Looseness and Misalignment An anti friction bearing health level indication is also incorporated Many informative scr...

Страница 7: ...the firmware in the device Off Route measurement The instrument offers many kinds of measurement The results are displayed on specific screens Some screens contain more results e g RMS and Peak some screens contain only one e g spectrum You can save each screen to the memory Such data are labelled as OFF ROUTE Route measurements The list of required measurements you can prepare in computer actuall...

Страница 8: ...n For example if a bearing was installed incorrectly then there will be high signal value immediately This value will remain stable for some time the bearing will be able to withstand it but then there will be a fast increase and destruction of the bearing This short bearing life can take hours days weeks or even months 3 Reliability of the diagnostics will never be 100 There will always be defect...

Страница 9: ...nge slowly But the wave s levels are unstable because measurements have significant variety of values The similar effects occur for bearing condition measurements You can measure RMS value the total energy in signal or PEAK value the highest peak in signal We can use both types for evaluation just have to realize of advantages and disadvantages RMS measurement advantages stable and well repeatable...

Страница 10: ...y the severity level of UNBALANCE LOOSENES and MISALIGNMENT from the top Measurement Points The measurement location must enable repeatable measurements under the same conditions as the previous measurement Also the direction of sensor radial axial for rotated machines is important That is why you should determine measurement points on the machine The typical machine together with the measurement ...

Страница 11: ...s to use measurement pads These are the cylinders with the diameter approx 26 mm and height 10 mm with a ground surface made of a magnetic stainless steel They are fixed to chosen points with special glue which ensures a perfect transmission of the high frequency vibrations The pad is covered with a plastic cover which is removed only for the measurement Another advantage of the cover is that when...

Страница 12: ...t have a place in this modern world The opposite is true Analysis of gears and low speed bearings e g in paper mills gain better quality by using the listening method The listening can easily be done by any maintenance person without deeper knowledge of diagnostics If there is a defective bearing distinct rumbling sound is audible in the headphones then If the bearing is OK then you can hear only ...

Страница 13: ...ument and accessories The instrument case contains measuring instrument A4900 Vibrio M vibration sensor accelerometer magnetic base for vibration sensor coiled cable to connect vibration sensor headphones measuring tip for putting manual pressure on vibration sensor 1 5V alkaline batteries CD with the manual Fig Adash 4900 Vibrio M with accessories ...

Страница 14: ...x nominal voltage of 1 5 V 4 To power this instrument use only alkaline or rechargeable NiCd NiMH batteries Regular carbon zinc batteries are not suitable Ignoring any of the recommendations mentioned below may cause failure of the instrument Handling voltage higher then 24 V can cause an accident WARNING Use correct battery polarity Incorrect polarity will cause destruction of the instrument HEAD...

Страница 15: ...d to the speed value The low speed machine should generate lower vibration then higher speed machine In the graphs area you found three particular areas GOOD condition is the space up to the yellow line that means operation without restriction The space above yellow but under red line is an ALERT condition Possible to operate the machine but have to be more checked It s necessary to determine the ...

Страница 16: ...aphs according to which the instrument determines acceptable vibration limits depending on machine speed 0 0 1 0 2 0 3 0 4 0 5 0 6 0 0 500 1000 1500 2000 2500 3000 3500 4000 speed RPM Vel 10 1000Hz mm s RMS 0 0 04 0 08 0 12 0 16 0 2 0 24 Vel 10 1000Hz ips RMS 0 0 0 5 1 0 1 5 2 0 2 5 3 0 3 5 0 1000 2000 3000 4000 5000 6000 7000 8000 speed RPM Acc 5k 16kHz g RMS ...

Страница 17: ...ght greater than 315 mm These machines are normally equipped with sleeve bearings Group 2 Medium sized machines rated power from 15 kW to 300 kW and electrical machines with a shaft height between 160 and 315 mm These machines are normally equipped with rolling element bearings Group 3 Pumps with multi vane impeller and with separate driver with rated power above 15 kW Group 4 Pumps with multi van...

Страница 18: ...ocity values border zone mm s in s Rigid R24 1 4 0 06 A B 2 8 0 11 B C 4 5 0 18 C D Flexible F24 2 3 0 09 A B 4 5 0 18 B C 7 1 0 28 C D Values setting in A4900 Vibrio M unit It s possible to set up these values directly in the unit Then the measured values are displayed in traffic light colours You can choose Adash limits recommended or 10 816 limits Setting up is in menu under the mode SETUP see ...

Страница 19: ...d firm part of a machine We should not be measuring on covers and so on The place should be clean without corrosion and paint It should also be flat so a sensor would not wobble The best is to use a measurement base which is glued on a machine It has a perfect surface plastic cover and is made from magnetic stainless steel This will enable you to perform the measurements on the machine at any time...

Страница 20: ...bration Sensor To measure a vibration signal we need to plug in the vibration sensor with ICP power The plugged in sensor must be a standard accelerometer with 100 mV g sensitivity The instrument is equipped by its own source of ICP power for connected sensor The sensor needs to be connected at the right input plug by a supplied cable Fig The instrument with a sensor connected ...

Страница 21: ...io M Further technical and contact information can be found at www adash com 21 Connectors top panel Micro USB Accelerometer input Contact less IR temperature sensor LEDs for stroboscope and torch Headphones output 3 5 mm jack ...

Страница 22: ...o a large extent on a pressure of the tip at the measurement point The magnet that attaches the sensor generates a constant pressure so the values are stable Attention Use the measuring tip only in hard to reach places where it is not possible to place the magnetic base Temperature measurement Infrared sensor for temperature measurement is aside from accelerometer input Measurement angle is about ...

Страница 23: ...e traffic lights 1 GOOD GREEN COLOR Machine is in good condition no defect is found The operation is without restrictions 2 ALERT YELLOW COLOR The beginning defect has been found on the machine It is possible to operate with paying more attention and planning of repair 3 DANGER RED COLOR Serious defect has been found on the machine Machine shouldn t be in operation Special functions are included i...

Страница 24: ...produces regular flashes of light When we have to study or to visually inspect the machinery which have cyclically moving parts then the stroboscope enables to froze the moving usually rotation Imagine the simplest form a rotating disc with one spaced hole When the flashes of light are synchronized with the rotational speed of the disc then just one flash is made during one rotation It means the d...

Страница 25: ...dphones and listening to a measured signal We can connect the headphones by a stereo 3 5 mm jack marked phones on the top of the instrument see figure in the Connectors chapter After connecting we can hear a signal from the vibration sensor in the headphones Advisable volume can be set up by the VOLUME item from the instrument menu see MENU chapter Increase volume button Decrease volume button ...

Страница 26: ... then a display will show an instrument Logo Fig Switching on Fig Switching off The instrument is switched off by pressing and holding the same button for a longer time The POWER OFF label version of firmware and serial number of instrument appear on the display After release the button the instrument switches off Description of numbers on power off screen 1 Firmware version 2 Serial number 3 HP f...

Страница 27: ...ns of the measured values and their actual values the display shows an information line in its upper part Fig Information line on a display Meaning of Displayed Symbols moving wave signifies measurement in progress setting of headphone output volume is indicated by yellow coloring of the bars this symbol shows an approximate battery status If the battery symbol is filled more then more battery pow...

Страница 28: ... the measuring starts Fig Measuring screen selection buttons Measurement Methods Screens Overall RMS values Measurement of RMS vibration values in the ranges 10 Hz 1000 Hz in mm s 0 5 kHz 16 kHz in g with estimated value of machine speed frequency Based on the speed and vibration values of the machine condition colour of displayed value green yellow red is determined The colour of bearing is deter...

Страница 29: ...s 0 5 kHz 16 kHz in g Spectrum 200 Hz looseness detection FFT analysis of vibrations in the range 0 Hz 200 Hz in mm s RMS with display of 3 maximum peaks found The peaks are arranged according to amplitude vibration size Time signal for roller bearing diagnosis Measuring of time signal and vibrations in the range 0 5 kHz 16 kHz in g Display shows actual measured time signal and Demod gENV value ...

Страница 30: ...e ranges 0 5 kHz 1 5 kHz in g 1 5 kHz 5 kHz in g 5 kHz 16 kHz in g FASIT expert system The FASIT screen displays the severity levels of machine faults Also the temperature bar is displayed on the right side When the RPM is not found then no results are displayed from ver 2 05 Overall RMS and Peak displacement values in the range 2 100 Hz in mm From ver 2 05 is the displacement displayed in um ...

Страница 31: ... measurement is displayed in Celsius and Fahrenheit degrees Also the coloured bar is used The bearing symbol on the other displays is also coloured according to the actual temperature value The ranges of colours are for less than 30 C green 30 45 C yellow 45 60 C orange 60 75 C red and for greater than 75 C dark red ...

Страница 32: ...memory and displayed together with the message set Push arrows it changes the value of speed with the step 250 RPM When the correct speed or the value near the correct speed is defined push Enter button for confirmation If no pushbutton is used for approx 4 seconds then the displayed value is accepted The word set is changed then to MAN This word informs all the time the user that speed is entered...

Страница 33: ...o the measuring screen MEMORY Memory operation if available ROUTE Route measurement VIEW View of data CLR DATA Clear all measurements in route CLR ALL Clear all data ESC Escape to the measuring screen VOLUME Phone output volume adjustment SETUP This item opens next item selection SPEED Set of speed detection ALARMS Selection of standard which will define limit values MEASURE UNITS Unit options for...

Страница 34: ...y button to switch off the light and the instrument starts to measure again Fig Torch mode LIGHT STROBO In STROBO mode you can use the instrument as a stroboscope White LEDs on the front side begins to flash with a frequency which is set up on the screen If the speed detection is known then frequency of flashes is set to that value By pressing buttons you can also change that frequency manually Th...

Страница 35: ...ew off route stored data properties The first line contain the memory address do not think about it Next lines contain the properties of saved measurements If the RTE is in beginning then this is the route measurement If the point number is in beginning then this is the off route measurement CLRDATA It removes all measured data off route and from the route The route list of machines is not removed...

Страница 36: ...ent back to the measurement mode Switched off cca 50 Maximum Fig Volume adjustment Fig Displayed volume During the instrument is switched on or off the range is changed the sensor is connected or disconnected the short unpleasant crack can be heard This is not a defect of the instrument Be careful not to overload the headphone amplifier by excessive volume This will distort a signal in the headpho...

Страница 37: ...ws and confirm by Enter SPEED Switch on AUTO ON or switch off AUTO OFF automatic detection of RPM The manual enter is required when AUTO OFF Old version of speed setup New version of speed setup For ver 2 05 and higher more options are available AUTO automatic speed detection MANUAL always manual entry of speed OFF speed value is ignored no limits with relation to speed are used ...

Страница 38: ... Chosen standard is displayed above the machine symbol F13 in this case If Adash standard is chosen nothing is displayed MEASURE This item contains the settings of measurements MEASURE UNITS To change the UNITS go to SETUP menu and then MEASURE menu Vibration speed unit can be chosen here mm s millimetres per second for Metric units and ips inch per second for Imperial units are available Device r...

Страница 39: ...E Displacement value setup Three options are available See above picture Confirm by button and your value settings will be saved TIME SETTING This choice allows you to setup time in your instrument By pressing and buttons is it possible to move between screens to setup date month year and time ESC Returns to the measurement screen ...

Страница 40: ...sensor unsuitable sensor type broken cable etc is detected then the temperature screen occurs and the error message is written upon the values Display Value Overload When the value exceeds the range of display then OVR is displayed Input Overload Error If an input signal is too strong higher than 12V peak the instrument cannot process it the overload error is displayed The instrument is not capabl...

Страница 41: ... Measurement Error If there is a break in communication between measuring and display boards inside of the instrument this measurement initialization error is displayed MEAS INIT If you see this error it means that the instrument is malfunctioning and we recommend sending it to the manufacturer for repair ...

Страница 42: ...ddle button to save data from measurement screen except FASIT screen On the screen appears Blue Menu with options MENU SAVE ESC No data to save SAVE is disabled MENU Instrument menu SAVE Go to save data screen ESC Escape Push SAVE button The address screen with point address appears The last point number with which you worked is displayed If this point contains data then USED is displayed Point wi...

Страница 43: ...nstrument returns back to measurement screen after data storing Measurement screen No 1 properties Stored data Velocity RMS 10 1000 Hz mm s ips Velocity Peak 10 1000 Hz mm s ips Acceleration RMS 500 16 000 Hz g Acceleration Peak 500 16 000 Hz g Speed Hz only if evaluated Measurement screen No 2 properties Stored data Velocity RMS 10 1000 Hz mm s ips Velocity Peak 10 1000 Hz mm s ips Acceleration R...

Страница 44: ... 800 lines Measurement screen No 4 properties Stored data Acceleration Demod Envelope RMS 500 16 000 Hz g Acceleration Demod Envelope Peak 500 16 000 Hz g Acceleration Demod Envelope time 500 16 000 Hz g 2048 samples Acceleration Demod Envelope spectrum 500 16 000 Hz g 800 lines range 400 Hz Measurement screen No 5 properties Stored data Acceleration time 1 16 000 Hz g 2048 samples Acceleration sp...

Страница 45: ...ment screen No 6 properties Stored data Displacement RMS 2 100 Hz µm mil Displacement 0 Peak 2 100 Hz µm mil Displacement Peak Peak 2 100 Hz µm mil Measurement screen No 7 FASIT properties Stored data No data are stored Measurement screen No 8 properties Stored data Temperature measurement 70 to 380 C 94 to 716 F ...

Страница 46: ...or more details The instrument enables route readings Use the DDS software for loading of route to the instrument Use the USB cable for connection The connection will be opened only when the instrument is in the overall values screen Select the MENU MEMORY ROUTE item The route screen appears The first machine appears The machines are the first level of route By using the you can find required mach...

Страница 47: ...een particular machines SEL Selection of machine and entry to point level After pressing middle SEL button next screen appears ESC Escape from the route ACK Go to point level of selected machine BCK Return Back to machine level Measurement point level Route screen point level Movement between particular points SEL Selection of point and entry to measurements ...

Страница 48: ...ute MEAS Start measurements on selected point BCK Return Back to point level Readings Push the MEAS button Readings defined in this point are taken If the temperature measurement is required then always it will be taken as first reading The actual temperature value is displayed on the screen Push ACK for saving or ESC for canceling Temperature reading in route ACK means Store ESC ...

Страница 49: ...adash com 49 After reading three options appears DEL deletes last reading in selected point ACK saving of reading and return back to the point level saving of reading end shift to next point When the route readings are finished then use again the DDS software for download of data into computer ...

Страница 50: ... shows RMS acceleration vibration value in g which is excited by a condition of bearing This condition is related to time wear of the bearing bad lubrication with new bearings as well incorrect installation with new bearings as well abrading of bearing The thermometer symbol is drawn together with the bearing The temperature color is used according the actual measured value SPEED The machine speed...

Страница 51: ...ntact with a bearing ring regular shocks contamination of bearing space by metal particles irregular shocks cracks Shocks which cause these defects are also parts of the RMS vibration values However the peak value of such shock is hidden in a value which contains all other information about vibrations i e noise from possible abrading wrong lubrication and overloading To simplify the RMS is an aver...

Страница 52: ...nal part seating or possibly other problems not related to mechanical looseness bent shaft See also FASIT chapters Time signal for bearing condition evaluation The time signal of bearing vibrations is displayed gENV value is under the time signal envelope modulated signal see Methods for ball bearing condition diagnostics chapter Caution the time signal is displayed as a direct record not after en...

Страница 53: ... shape is steady too but it has bigger amplitude then previous case You can clearly see different bigger range of the graph 1 0 g Damaged bearing There are clearly visible shocks caused by a rolling element coming across the damage like pitting or crack here The shocks repeat themselves regularly The range of the graph is different again 2 0 g in this case ...

Страница 54: ...he analysis procedure on a signal obtained on a seating of an inlet transmission shaft with the speed frequency 25 Hz 1500 rpm and with a gear with 65 teeth So called tooth frequency can be obtained by simple multiplication of the shaft revolution frequency in Hz by the number of teeth fGMF fspeed z fGMF gear mesh frequency fspeed speed frequency z number of teeth In our example the tooth frequenc...

Страница 55: ...actice Unbalance circle with heavy spot icon Looseness shoe icon Misalignment clutch icon Correspondent faults horizontal bars are in middle On the right bottom corner you find the rolling bearing icon The vertical bar displays the bearing condition The meaning of Machine and Bearing bars was described in Screen No 1 The temperature bar is displayed quite on right side The ranges of colours are fo...

Страница 56: ...placement RMS 2 100 Hz µm mil Displacement 0 Peak 2 100 Hz µm mil Displacement Peak Peak 2 100 Hz µm mil Temperature non contact measurement 0 380 C 32 716 F Further functions LED stroboscope 0 17 300 Hz 10 18 000 RPM LED torch non contact temperature measurement vibration stethoscope Memory 4 MB for data 900 measurements of 800 lines spectra or 2048 samples time signals may be stored Data storing...

Страница 57: ...B it is 30 40 in 1 10000Hz range This uneven property does not allow using it for calibration The voltage accuracy of instrument is high 2 5 or 5 comparing with the accelerometer Vibration velocity measurement frequency response 27 24 21 18 15 12 9 6 3 0 3 1 10 100 1000 10000 log F Hz A dB Measurement accuracy 10 mm s RMS input signal is 2 5 5 500 Hz frequency range and 5 500 2000 Hz range Vibrati...

Страница 58: ...ularly test the unit on two frequencies 80Hz and 8kHz On the initial A4900 screen are displayed RMS values of velocity and acceleration The velocity value should be 10 mm s and the acceleration should be 0 5g The signal from A4801 is adjusted for exact 100mV g sensitivity When the sensitivity of A4900 unit is e g 95mV g then the higher values 10 5mm s and 0 53g will be displayed Expected values fr...

Страница 59: ...he frequency response and the amplitude response Use the amplitude 1g for frequency response test Change the frequency from 500 to 12000 Hz and draw the curve Set the 1 2kHz or higher for amplitude response Change the amplitude from 0 1 to 10g and read values Envelope demodulation test The envelope value is RMS value Do not use comparing with peak values Switch the ICP off and use the 8kHz pure si...

Страница 60: ...tinuously for long periods or frequently Zone 1 21 Explosive atmosphere is likely to occur under normal operation occasionally Zone 2 22 Explosive atmosphere is unlikely to occur in normal operation and if it does will persist for a short period only Using of Instrument Thej A4900 Vibrio Ex unit is certified for using in explosive risk areas zones 1 and 2 with all gases group It means IIA acetone ...

Страница 61: ...echnical and contact information can be found at www adash com 61 Certificated accessories Accelerometer AC90x II 1 G D US C 0518 Baterie Headphones In explosion risk area you can use headphones with impedance 4 32Ohm and max industance 1mH ...

Страница 62: ...va Czech Republic A4900 Vibrio Ex U 25 6V I 92mA L 60µH C 100nF o o o o U 5 4V I 235mA L 1mH C 10µF o o o o IP65 20 C T 50 C a II 2 G Ex ib IIC T4 Gb 1026 Use only 2x 1 5V AA size LiFeS batteries Energizer L91 certificated 2 Use only or sensor certificated A 90x A 91x C C FTZÚ 14 ATEX 0130 Do not open in a hazardous area Attention In explosion risk areas use only the authorized L91 batteries and a...

Страница 63: ...stems Bently Nevada Emerson Epro The buffered outputs on these systems are used for Vibrio MP connection Switch On of Instrument After the switch on the first screen appears It is different then standard Vibrio M You need to select the mode The Acc means the standard mode the same as VibrioM for measurement with acceleromer The Prox mode is the optional mode for proximity sensors The default senso...

Страница 64: ... on the first screen It works in range 3 200Hz and you can switch off it in setup When you push the central button USER then do enter the speed manually by using of arrows DC offset The measurement of DC part in signal gap It is displayed in Volts range 24V Displacement in 1 1000Hz range Three display options are available to set in setup RMS and 0 PEAK RMS and PEAK PEAK 0 PEAK and PEAK PEAK ...

Страница 65: ...ble You need to choose range 1000Hz or 2500Hz The PEAK PEAK value on speed frequency and two max peaks in spectrum are displayed below the spectrum Spectrum 200Hz The same as spectrum previous screen only the range 200Hz is different Time waveform in 1 1000Hz The number of rotations defined in setup by user default 1 max 6 is displayed in this time waveform screen ...

Страница 66: ...etup button as in standard Vibrio M The next list of options appears RevCnt The number of rotations defined in setup by user default 1 max 6 which will be displayed in time waveform screen CONFIG Contains the speed entering manual autodetect and the range of spectrum 1k 2k5 EVAL Selection of content of displacement screen ...

Страница 67: ...ADASH Ltd Adash 4900 Vibrio M Further technical and contact information can be found at www adash com 67 SENSOR The sensor sensitivity ...

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