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Machine vibration diagnostics
Bearing diagnostics
Lubrication diagnostics
Service activities
Product Inspection
FASIT - Fault Source Identification Tool ( see details inside)
Spectrum FFT analysis
Measurement of time signals
Built-in stroboscope lamp
Determination of machine and bearing conditions
Detection of speed
Wideband measurements RMS or PEAK acceleration (g)
and velocity (mm/s) values
Measurement in frequency bands for bearing diagnostics
Colour display
Simultaneous display of two measured values
External piezoelectric accelerometer with 100 mV/g sensitivity
Overload indicator, sensor fault and cable fault indicators
Possibility of connecting headphones for "listening of vibration"
Built-in torch
Simple control by three buttons
Manual
Stroboscope
PCE-VT 250
Ref. No.: 240709
PCE Americas Inc.
711 Commerce Way
Suite 8
Jupiter
FL-33458
USA
From outside US: +1
Tel: (561) 320-9162
Fax: (561) 320-9176
info@pce-americas.com
www.pce-instruments.com/english
www.pce-instruments.com
PCE Instruments UK Ltd.
Units 12/13
Southpoint Business Park
Ensign way
Hampshire / Southampton
United Kingdom, SO31 4RF
From outside UK: +44
Tel: (0) 2380 98703 0
Fax: (0) 2380 98703 9
info@pce-instruments.com
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Table of Contents
Related Manuals for Adash 4900 Vibrio III
Summary of Contents for Adash 4900 Vibrio III
- Page 1 PCE Americas Inc. PCE Instruments UK Ltd. 711 Commerce Way Units 12/13 Suite 8 Southpoint Business Park Jupiter Ensign way FL-33458 Hampshire / Southampton United Kingdom, SO31 4RF From outside US: +1 From outside UK: +44 Tel: (561) 320-9162 Tel: (0) 2380 98703 0 Fax: (561) 320-9176 Fax: (0) 2380 98703 9 info@pce-americas.com...
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Page 2: Table Of Contents
Instrument and accessories....................10 Before You Start ........................11 Standards for vibration measurements ................12 Adash Limit Values of Machine and Bearing Vibrations ............13 ISO 10816 limit values.......................14 Classification according to machine type, nominal power or shaft height........14 Classification according to foundation ..................14 Evaluation ranges ........................ - Page 3 How to evaluate the failure....................32 Overall RMS values ......................32 Overall PEAK values ......................33 Spectrum 200 Hz– Detection of Looseness ..............33 Time signal for bearing condition evaluation ..............34 Vibrations on frequency range – gearboxes/bearings............36 FASIT Expert System ......................39 Specifications Adash 4900 – Vibrio III................40...
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Page 4: Why Perform Vibration Diagnostics
ADASH Ltd. Adash 4900 – Vibrio III Why perform vibration diagnostics A4900 Vibrio III instrument is able to do all required basic vibration diagnostic measurements. That means bearing condition, lubrication, mechanical faults ( misalignment, unbalance, mechanical looseness and resonance). The instrument performs a lot of operations automatically. It’s possible to connect ear phones to listen vibration signal, which is very useful for gearbox and slow running roller bearing diagnosis. -
Page 5: Vibration Diagnostics - Basic Information
ADASH Ltd. Adash 4900 – Vibrio III Vibration Diagnostics - Basic Information Introduction What is it the vibration diagnostics? This chapter explains the basic steps and you will be able to begin practical measurements. More information you can find in the literature. -
Page 6: Machine And Bearing Condition Diagnostics
ADASH Ltd. Adash 4900 – Vibrio III Machine and bearing condition diagnostics Basic defects which we’d like to find out are - unbalance (heavy spot on the rotor causes vibrations), - misalignment (machinery parts are not in alignment ), - looseness (machine is not properly connected with its base - soft foot), - bearing defect (wear of bearing, bad assembly, bad lubrication or overload). -
Page 7: Fasit - Fault Source Identification Tool
FASIT - Fault Source Identification Tool The FASIT is also included in the Adash 4900 Vibrio III. The name FASIT is used in more Adash products for expert system, which would help the user to find the source of vibration troubles. It is good message for users, because such functions were not ever built-in the instrument in this price category. -
Page 8: The Preparation Of The Measurement Point
ADASH Ltd. Adash 4900 – Vibrio III The preparation of the measurement point On the measurement point we make a measurement. To obtain a quality measurement, the points for measurements must be prepared in advance. For regular measurements the sensor must be always fixed in the same way at the same point. -
Page 9: Listening To Vibrations Using Headphones
Beetle in the surrounding cement. In the end put a cover on the pad. Listening to Vibrations Using Headphones A user can connect headphones to the Adash 4900 – Vibrio III instrument, since listening to a measurement signal also enables a differentiation of a problem type. People can think that this is an old method, which does not have a place in this modern world. -
Page 10: What Will You Get With Your Instrument
- 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 Fig. Adash 4900 – Vibrio III with accessories... -
Page 11: Before You Start
ADASH Ltd. Adash 4900 – Vibrio III Before You Start Ignoring any of the recommendations mentioned below may cause failure of the instrument. Handling voltage higher then 24 V can cause an accident. 1. Always connect only ICP type of sensor into an ICP marked socket ! If unsure, consult the procedure with your supplier. -
Page 12: Standards For Vibration Measurements
The standards should be determined for a narrow range of machines. A4900 Vibrio III contains Adash limit values. They are not rewritten from any existing standards. It’s a result of 20 years of Adash engineering team experiences. It’s difficult to invent critical value definition which would be simple (that means not many parameters such as speed, power, bearing type, machine type and so on) and reliable. -
Page 13: Adash Limit Values Of Machine And Bearing Vibrations
ADASH Ltd. Adash 4900 – Vibrio III Adash Limit Values of Machine and Bearing Vibrations Graphs, according to which the instrument determines acceptable vibration limits depending on machine speed. 0.24 0.16 0.12 0.08 0.04 1000 1500 2000 2500 3000 3500 4000 speed [RPM] ---->... -
Page 14: Iso 10816 Limit Values
ADASH Ltd. Adash 4900 – Vibrio III ISO 10816 limit values There is a wide range of valid standards but we would like to mention ISO 10816. It has several sections and it also deals with procedures how to gain limit values for particular machines. It contains 3 tables of values, which are applicable for A4900 VibrioIII unit. -
Page 15: Classification Of Vibration Values For Machines Groups 1 And 3
It’s possible to set up these values directly in the unit. Then the measured values are displayed in traffic light colors. You can choose Adash limits (recommended) or 10-816 limits. Setting up is in menu under the mode SETUP (see instrument operation). -
Page 16: Quick Start
ADASH Ltd. Adash 4900 – Vibrio III Quick Start The aim of this chapter is to introduce you to this instrument, and, without reading a complete User’s Guide, enable you to measure first vibration values. This chapter does not intend to fully and in detail describe operation of this instrument or measurement methodology. -
Page 17: Plugging In Vibration Sensor
ADASH Ltd. Adash 4900 – Vibrio III Fig. Placement of power batteries Fig. Proper cell polarity Plugging in Vibration 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. -
Page 18: Connectors
ADASH Ltd. Adash 4900 – Vibrio III Connectors connector to plug connector to plug in in the sensor headphones (stereo jack 3.5mm) Fig. Top view of connectors Measuring Screw the sensor onto the magnetic base. Do not forget to remove the plastic cover and a metal washer (it closes a magnetic field for longer service life of the magnet) before measuring. -
Page 19: Fasit Expert System
Special functions are included in the instrument for the determination of that three states. The overall vibration values are colored with appropriate color. The vibration limits Adash for each state are determined from the graphs, which are printed in the Adash Limit Values of Machine and Bearing Vibrations chapter. -
Page 20: The Torch
ADASH Ltd. Adash 4900 – Vibrio III The Torch You sometimes need to inspect or read the dark corners. In that time you are lucky with A4900 - Vibrio III, because this instrument has built-in torch in front panel. See the Menu chapter for details. -
Page 21: Instrument Operation
ADASH Ltd. Adash 4900 – Vibrio III Instrument Operation Switching on and off The instrument is switched on by pressing of the middle button marked with Instrument on / off button Fig. Buttons / Switching the instrument on Provided that batteries with sufficient voltage are placed in the instrument then a display will show an instrument Logo. -
Page 22: Information Line
ADASH Ltd. Adash 4900 – Vibrio III Information line After powering on the display shows measured data. Beyond descriptions 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”... -
Page 23: Selection Of Measurement
ADASH Ltd. Adash 4900 – Vibrio III Selection of Measurement A selection of measuring screen (method) can be performed by the buttons ▼ ▲. After press of a button an “empty screen” is shown without measured data, and the measuring starts. - Page 24 ADASH Ltd. Adash 4900 – Vibrio III Spectrum 200 Hz–looseness detection FFT analysis of vibrations in the range: 2 Hz - 200 Hz in mm/s RMS, with display of 3 found maximum peaks. The peaks are ranked according to amplitude vibration size.
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Page 25: Speed Detection And Definition
ADASH Ltd. Adash 4900 – Vibrio III Speed detection and definition After switch on of the instrument the Screen No.1 appears and the automatic speed detection begins. It must be said - obviously. The user can the automatic speed detection switch off in the Menu. The determination procedure is displayed as running bar in the bottom of screen. -
Page 26: Menu For Functions Selection
ADASH Ltd. Adash 4900 – Vibrio III Menu for functions selection By pressing button, the instrument menu appears. If the instrument is in the error stage (for example “SENSOR ERROR“), then some functions are not available. LIGHT - Torch mode... -
Page 27: Strobo
ADASH Ltd. Adash 4900 – Vibrio III STROBO In STROBO mode you can use the instrument as the stroboscope. White LED built-in on the front side begins to flash with a frequency, which is set up on the screen. If the speed determination is known, then frequency of flashes is set to that value. -
Page 28: Setup
ADASH Ltd. Adash 4900 – Vibrio III SETUP Further functions menu appeared. Choose requested function using arrows and confirm by Enter. SPEED Switch on (ON) or switch off (OFF) automatic determination of revolutions function. ALARMS Standards setup, Alert limits (amber color) and Danger (red color) will be defined. See Standards for... -
Page 29: Units
ADASH Ltd. Adash 4900 – Vibrio III Chosen standard is displayed above the machine symbol (F13 in this case). If Adash standard is chosen, nothing is displayed. UNITS Vibration speed unit can be chosen here. mm/s (millimeters per second) and ips (inch per second) are available. -
Page 30: Error Messages
ADASH Ltd. Adash 4900 – Vibrio III Error Messages Sensor connection Error This error signifies incorrect connection of a sensor, unsuitable sensor type, broken cable etc. Overload Error If an input signal is too strong (higher than 12V peak), and the instrument cannot process it, the... -
Page 31: Measurement Error
ADASH Ltd. Adash 4900 – Vibrio III Measurement Error If there is a break in communication between measuring and display boards inside of the instrument, this measurement initialisation error is displayed (MEAS INIT). If you see this error, it means that the... -
Page 32: How To Evaluate The Failure
ADASH Ltd. Adash 4900 – Vibrio III How to evaluate the failure The instrument shows measurement results on several separate screens. We shall describe basic rules for their use. Overall RMS values - Machine symbol - this line shows a RMS velocity vibration value in mm/s or ips, which is excited on the machine by mechanical phenomena related to: - imbalance of rotational parts of the machine (fan wheel, impeller, clutch wheel etc.),... -
Page 33: Overall Peak Values
ADASH Ltd. Adash 4900 – Vibrio III 3. DANGER – RED COLOUR There is an serious defect found on the machine. Machine shouldn’t be in operation Overall PEAK values Similar rules for evaluation of the measured values, as in the previous screen are valid for this screen with one difference. -
Page 34: Time Signal For Bearing Condition Evaluation
ADASH Ltd. Adash 4900 – Vibrio III frequency (see the value description in the bottom) the probably the mechanical looseness is the machine problem. The most common causes of this defect are: - soft flanges, - loose anchoring bolts, - cracks in frames – cracked welds,... - Page 35 ADASH Ltd. Adash 4900 – Vibrio III Undamaged bearing – wrong lubrication: The time record 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.
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Page 36: Vibrations On Frequency Range - Gearboxes/Bearings
ADASH Ltd. Adash 4900 – Vibrio III Vibrations on frequency range – gearboxes/bearings. When we need to find the failure on not simple machines (e.g. gearbox) then is very usefull to know the vibration values in several frequency bands. The screen No. 6 shows measurement values in three frequency bands: 0.5 –... - Page 37 ADASH Ltd. Adash 4900 – Vibrio III Example. We are going to show the 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.
- Page 38 ADASH Ltd. Adash 4900 – Vibrio III Condition 3: While in the last band the vibration value is very low, in the first two frequency bands the values are very high. Very high probability of gear defect - wear of teeth,...
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Page 39: Fasit Expert System
ADASH Ltd. Adash 4900 – Vibrio III FASIT Expert System The description of the FASIT was made in the beginning of his guide. This screen can be displayed behind the screen No.6 ( right arrow) or simply from the screen No.1 ( left arrow), because it is before the No.1. -
Page 40: Specifications Adash 4900 - Vibrio Iii
ADASH Ltd. Adash 4900 – Vibrio III Specifications Adash 4900 – Vibrio III Input: - 1x ICP powered accelerometer 100 mV/g sensitivity Measurements: - RMS, PEAK (10 Hz - 1000 Hz) [mm/s], [um, mm] - Spectrum 200 Hz [mm/s] - RMS, PEAK (500 Hz - 16000 Hz) [g] - RMS, PEAK (1500 Hz –...