Related Manuals for CEMB N130-GL
Summary of Contents for CEMB N130-GL
- Page 1 Office: Jl.Radin Inten II No 61 B Duren Sawit, Jakarta Timur www.testingindonesia.co.id N130-GL GRINDING WHEELS BALANCER PORTABLE VIBROMETER USER MANUAL Rev. 02/2019 EN Translation of the original instructions...
- Page 3 Index N130-GL rev. 02/2019 EN Chapter 1 - General description Standard accessories................1 – 1 Optional accessories ................1 – 2 Connections ..................... 1 – 3 Input A (vibration sensor – BLUE input) ..........1 – 4 ...
- Page 4 Chapter 4 - Setup mode Sensor setup .................... 4 – 1 Sensor type ........... ……………………………4 – 1 Sensor sensitivity ..........……………………4 – 2 Measure setup ..........…………………………………….4 – 2 Measurement unit ........…………………………….4 – 3 ...
- Page 5 Open measure ..........……………………………6 – 4 Measure setup ..........……………………………6 – 4 Autoscale ..........……………………………………6 – 4 Take screenshot ........... ……………………………6 – 5 Chapter 7 - Grinding wheel balancer mode Function access menu ............……………………7 – 2 ...
- Page 6 Empty page Index...
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Page 7: General Description
Chapter 1 General description The N130-GL instrument is supplied, together with its accessories, in a special case. It is advisable, each time the instrument is used, to place back it in its case in order to avoid risk of damage during transit. -
Page 8: Optional Accessories
No.1 probe Photocell complete with stand and magnetic base Roll of reflecting paper No.1 set scale rings No.1 micro USB cable No.1 battery charger with multiplug adapters No.1 HEAVY DUTY carrying case No.1 USB key containing instruction manual in PDF format "Quick Guide"... - Page 9 Connections 1. battery charger 2. micro USB port (useful for connecting the instrument to a PC and sharing a folder for the exchange of data between the two elements) 3. connector for photocell input 4. connector for sensor input To connect the sensor or the photocell, insert the connector (type M12 male) into the corresponding socket, screwing it clockwise until it is locked, as shown in the figure below.
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Page 10: Status Leds
Input A (vibration sensor – BLUE input) CONNECTOR PINOUT 1 – GROUND + SHIELDING (SIG-) 2 – SENSOR INPUT (SIG+) 3 – SENSOR POWER SUPPLY) Input TACHO (photocell sensor – YELLOW input) CONNECTOR PINOUT 1 – +24 VDC 5 – TACHO IN 8 –... -
Page 11: General Advice
Battery The N130 instrument is provided with a built-in rechargeable lithium battery, which allows autonomy of more than 8 hours under normal operating conditions of the instrument. The battery status is indicated by an icon in the upper right hand corner of the screen. BATTERY DESCRIPTION INDICATOR... - Page 12 Empty page 1 - 6 General description...
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Page 13: General Layout
Chapter 2 General layout Keys/buttons on the control panel The control panel of the CEMB N130-GL instrument incorporates a keypad where the various keys or buttons can be subdivided by function: ON/OFF button Press this button to switch the instrument on; hold it down for at least 3 seconds to switch it off , then release the button. -
Page 14: Function Keys
Caution: In case the instrument no longer responds to any command, it can be turned off by keeping the button pressed for about 12 seconds. OK button Pressing this button in a setup screen confirms the settings selected, and allows switching to the next screen. -
Page 15: Screen Description
Screen description 1. battery charge level (see 1-5 Battery) 2. measure/function type 3. date and time 4. main screen content - graphical representation of the measurement 5. information/indications on the measure 6. function corresponding to the F1 key 7. function corresponding to the F2 key 8. - Page 16 Function “Save measure” Available where is possible to save an acquired data. In this phase the instrument shows the available projects; the data saving cases can be 2: 1. Saving in a existing project Select the project name from the list and press Select the bearing support number (selectable value from 1 to 20), then the orthogonal measurement direction.
- Page 17 The successful saving of the measurement is confirmed by the following screen. Note: Use “arrow” keys and to confirm. Note: For the type of the reserved data and its management refer to Appendix E - "The JSON file" Function “Open measure” Available in different functions of the instrument.
- Page 18 Once the measurement point has been selected, press to display the saved date on the display. Note: Use “arrow” keys and to confirm. Note: For the type of the reserved data and its management refer to Appendix E - "The JSON file" ...
- Page 19 Note: By pressing the key (BACK) the changes made are canceled and the previous setup is restored Function “Take screenshot” Function available in all the MENU items that allow to "capture" the display screenshot by saving it as a ".png" file. Once the screen is "captured", the display will show confirmation that it has been saved.
- Page 20 Functions operating on the graphs (valid only for FFT function) Scale setting: After an acquisition, the data is displayed on the graph in AUTOSCALE mode (axes limits in line with the data in the graph). The zoom of the X axis is possible by pressing the “arrow” keys , while keys make the zoom of the Y axis.
- Page 21 Peak list: When this function is selected, a table appears with the 10 peaks of highest value present in the zone of the spectrum displayed, and associated with the corresponding frequencies. Their value is calculated by applying an interpolation algorithm to the FFT graph; this also allows identifying peaks not situated in correspondence to one of the lines of the spectrum (see Measure setup –...
- Page 22 Empty page 2 - 10 General layout...
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Page 23: Home Screen (Menu)
Chapter 3 Home screen (menu) After fully switching on the N130-GL instrument, it shows its Home screen. which, besides showing a set of information as: current date and time battery charge state as a normal menu, it also proposes and allows selection of the available functionality, namely:... - Page 24 DESCRIPTION GRINDING guided procedure for the balancing in service of the WHEEL grinding wheels BALANCER measurement of the rotation speed of a impeller (by TACHO using the photocell - optional for N130-GL) 3 - 2 Home screen (menu)
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Page 25: Setup Mode
Chapter 4 Setup mode This mode allows to make all the settings configuration possible on the N130-GL instrument. These setting are: 1. setting of the sensors connected to the instrument 2. setting of the general measurement parameters 3. setting of the general operating parameters of the instrument... -
Page 26: Sensor Sensitivity
Sensor sensitivity This is the number of volts per unit produced by the sensor: it is expressed for the various types in SENSOR TYPE SENSITIVITY TYPICAL VALUE ACCELEROMETER mV/g VELOMITOR mV/(mm/s) 3,94 Use the keys to access to the sensitivity value setup page. Use the "arrows"... - Page 27 Measurement unit Select the unit of measurement in which to supply the vibration; possibilities are as follows: acceleration (g) – this unit enhances the higher frequencies and attenuates the low frequencies velocity (mm/s or inch/s) displacement (µm or mils) – this unit enhances the lower frequencies and attenuates the high frequencies ...
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Page 28: Number Of Lines
Max frequency This is the maximum frequency of interest in the phenomenon under examination; it is the maximum frequency that can be displayed in the spectrum. It can be chosen among the default values 1000, 2500, 5000, 10000 Hz. Note: The typical choice, suitable for most situations, is 1000 Hz (60,000 RPM), coherently with the requirements of ISO 10816-3. - Page 29 Note: The use of an excessively high number of lines is not recommended unless in situations where an extreme resolution is essential. In fact, such choice would lead to an increase in calculation times and space required for data saving, often without adding particular information.
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Page 30: Device Setup
Device setup The parameters for general use of the instrument should be preset in this page. Date / Time Use the keys to enable parameter modification. Then use the keys to set the date in the format DD/MM/YYYY or the time in the format HH: MM. -
Page 31: Lcd Backlight
Language Select one of the possible languages: ITALIAN ENGLISH GERMAN SPANISH FRENCH CHINESE RUSSIAN LCD backlight Adjusts the display backlighting from a minimum value (10%) to a maximum (100%), with intermediate steps of 10%. ... -
Page 32: Firmware Update
To complete the update, proceed as follows: Connect the N130 to the PC with the supplied USB cable Copy the new firmware into the update folder on the N130-GL Disconnect the USB cable Select "Firmware update" in the N130-GL device ... -
Page 33: Vibrometer Mode
Chapter 5 Vibrometer mode One of the simplest, but at the same time most significant information in vibration analysis, is the overall value of the actual vibration. In fact, this is very often the first parameter to be considered when evaluating the operating conditions of a motor, fan, pump, machine tool. Appropriate tables allow discrimination between an optimum state and a good state, or from an allowable, tolerable, non-permissible or even a dangerous one. - Page 34 1. 1xRPM amplitude of the vibration 2. angular phase of the 1xRPM vibration 3. impeller rotation speed Measurement of an OVERALL vibration Select the VIBROMETER mode from the main page of the instrument by pressing the key At the first access to the function after switching on the instrument, if no measurement has been performed yet, an alarm reminds to connect the sensors before making the measurement.
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Page 35: Menu Function
Note: The measurement of a 1xRPM vibration requires the use of the photocell; therefore a reflecting plate must be applied on the impeller as a reference mark (0°). Starting from this position, the angles are measured in the opposite direction to the shaft rotation (see appendix D - Photocell for Nx30 instruments). - Page 36 Empty page 5 - 4 Vibrometer mode...
- Page 37 Chapter 6 FFT mode - Fast Fourier Transform A complete analysis of the vibration cannot fail to take into account the study of the various factors contributing towards forming its overall value. Hence it is essential to be able to carry out spectrum analysis with FFT (Fast Fourier Transform) algorithm.
- Page 38 Measurement of a FFT spectra Select the FFT mode from the main page of the instrument by pressing the key At the first access to the function after switching on the instrument, if no measurement has been performed yet, an alarm reminds to connect the sensors before making the measurement.
- Page 39 MENU function Access to the menu using the key . The following functionalities are available here: Cursor mark Displaying the cursor on an FFT chart (see Use of the cursor 2-8) makes available a particular mode called Harmonic Cursor. Within the FFT function, access to the MENU by pressing ;...
- Page 40 The keys , which determines the movement of the dominant cursor on the various frequency peaks, consequently determines the movement of the corresponding harmonic cursors. Note: The harmonic cursor allows to easily recognize in the spectrum families of peaks in correspondence of multiple frequencies, typically indicative of particular defects (see Appendix C).
- Page 41 Take Screenshot Allows to "capture" the image on the screen by saving it as a .png file (see Function "Take screenshot" 2-7). FFT mode – Fast Fourier Transform 6 - 5...
- Page 42 Empty page 6 - 6 FFT mode – Fast Fourier Transform...
- Page 43 Chapter 7 Grinding wheel balancer mode The N130-GL instrument has a practical function for balancing in situ of grinding wheels, using a vibration sensor and a photocell. The instrument is able to balance grinding wheels with no.2 or no.3 sliding weights through a simple procedure, which guides the operator step by step along the sequence of operations.
- Page 44 Function access menu The selection of the function shows to the operator a page where to select the following options: 1. New program 2. Open project 3. Delete project 4. Use current project (available only if a program previously created has been completed until the balancing correction is calculated) New project - BALANCING SETUP The creation of a new program requires the setting of some parameters, carried out in NEW...
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Page 45: Open Project
Setting of the grinding wheel rotation direction Choose from the following options: CLOCKWISE COUNTER CLOCKWISE Note: Move between the available choices using the and keys Confirm each setup step using the key Back to the previous step with (BACK). -
Page 46: Delete Project
Note: On the "Final Report" screen, the (BACK) key backs to the main menu of the balancing mode, while the key (TAKE SCREENSHOT) takes a screenshot of the display, saving it as a .png file (see Function "Take screenshot" 2-7). Delete project Allows to individually delete the balancing projects saved in the instrument. -
Page 47: Calibration Sequence
Use current project Resume the balancing program previously created and completed (calibration procedure completed and calculation of the balancing correction). Attention: Switching off the device causes the loss of unsaved data (and therefore also of the current project); this option is therefore not initially available for a new instrument switch-on;... - Page 48 Note: Use the key (NEXT) to go to the next vibration acquisition screen. In case key is pressed incorrectly, a warning indicates the exact procedure to follow. Move the sliding weights as required, at the first startup of the instrument, if no measurement of this type has been performed yet, a warning message reminds to connect the sensors before making the measurement itself.
- Page 49 The higher is the level of the bars, the better will be the quality of the measurement (which is averaged over time). After reaching the required level, stop the measurement again by pressing Note: Unstable signals produce measures whose quality fails to reach acceptable levels.
- Page 50 Briefly, the weight "B" must be moved to 60° (procedure with no.3 sliding weights) or 90° (no.2 sliding weights). Note: To facilitate the operator, the weight to be moved (weight "B") will be represented as a flashing light. Blinking weight After moving the weight "B"...
- Page 51 Stop the measurement with a further pressure of Attention: The average speed value is very important because the calibration procedure can be considered to be well executed only if between each step this speed does not show differences greater than 5%. The control of this condition is left to the operator.
- Page 52 Note: Use the key (NEXT) to go to the next vibration acquisition screen. In case key is pressed incorrectly, a warning indicates the exact procedure to follow. Note: From this point, going back to the instrument home page and accessing again to the function, will be available the item "Use current project"...
- Page 53 Stop the measurement with a further pressure of If the vibration value reached is good, press (END) to complete/end the balancing procedure (FINAL REPORT). On the other hand, if the vibration value is NOT good, press (REFINE) to refine the position of the sliding weights.
- Page 54 Stop the measurement with a further pressure of (END) goes to the "FINAL REPORT" page, reporting the values of vibration and unbalance preceding and following the balancing procedure. 1. Project name (shown only when the project is saved) 2. Initial synchronous vibration (before balancing procedure) 3.
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Page 55: Save Project
MENU function Access to the menu using the key . The following functionalities are available here: Save project From the menu select the "Save project" item by pressing the key Type the desired name for the project; each single letter composing the name must be selected by moving with the "arrow"... - Page 56 Take Screenshot Allows to "capture" the image on the display by saving it as a .png file (see "Take screenshot" function 2-7). Press to continue. 7 - 14 Grinding wheel balancer mode...
- Page 57 Before proceeding with more in-depth analysis, operators may sometimes need to detect the rotation velocity of one or more of the shafts with a high degree of precision. The N130-GL instrument has a precise tachometer function, capable of measuring rotation speed of up to 250.000 RPM.
- Page 58 Measurement of a “TACHO” value Select the TACHO mode from the main page of the instrument by pressing the key At the first access to the function after switching on the instrument, if no measurement has been performed yet, an alarm reminds to connect the sensors before making the measurement.
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Page 59: Technical Data
Appendix A Technical data General Characteristics Dimensions: 195(W) x 120(L) x 35(H) mm Weight: 490 gr 4.3” colour LED-backlit TFT LCD high visibility with direct exposure to sunlight Display: resolution 480x272 pixel no.8 embossed keys, included no.2 function keys Keyboard: ... - Page 60 Carrying case Dimensions: approx. 440(W) x 360(L) x 145(H) mm Weight complete of approx. 3100 gr Standard accessories: Measurement types effective value [RMS] Measure mode: Peak value [Pk] Peak-to-Peak value [PkPk] acceleration - [g] Measure units: ...
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Page 61: Evaluation Criteria
Appendix B Evaluation criteria ISO 10816-3 Mechanical vibration - Evaluation of machine vibration by measurements on non- rotating parts - Part 3: industrial machines with nominal power above 15 kW and nominal speeds between 120 r/min and 15 000 r/min when measured in situ. Introduction ISO 10816-3 constitutes the basic document that describes the general requirements for evaluation of vibration in different types of machinery when the vibration measurements are... -
Page 62: Classification Accor Ding To Machine Type, Nominal Power Or Shaft Height
Figure 2 Measurement points for Figure 1 Measurement points vertical machine units Classification accor ding to machine type, nominal power or shaft height Significant differences in design, type of bearings and type of support structures require a division into different machine groups (as regards the shaft height, see ISO 496). The machines in the 4 groups below may have a horizontal, vertical or inclined shaft and may be mounted on rigid or flexible supports. - Page 63 Group 4: Pumps with fin rotors and incorporated motor (mixed or axial flow centrifugal pumps) with nominal power above 15 kW. The machines in this group normally have sleeve or rolling bearings. Classification accor ding to s upport flexibility The flexibility of the support unit in the specified directions is classified considering two possibilities: –...
- Page 64 Zone C: machines with vibration within this zone are normally considered unsatisfactory for long-term continuous operation. Generally, the machine may be operated for a limited period in this condition until a suitable opportunity arises for remedial action; Zone D: vibration values within this zone are normally considered to be of sufficient severity to cause damage to the machine.
- Page 65 Table A.2 Classification of the vibration severity zones for Group 2 machines: Medium-sized machines with nominal power above 15kW up to and including 300 kW or electrical machines with shaft heights from 160 mm up to ≤ 315 mm Support class Zone limit Effective velocity mm/s Rigid...
- Page 66 Empty page B - 6 Evaluation criteria...
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Page 67: A Rapid Guide To Interpreting A Spectrum
Appendix C A rapid guide to interpreting a spectrum TYPICAL CASES OF MACHINE VIBRATIONS 1. PRELIMINARY RAPID GUIDE f = vibration frequency [cycles/min] or [Hz] s = shift amplitude [µm] Measured values during control v = vibration speed [mm/s] a = vibration acceleration [g] n = piece rotation speed [rpm] Frequency data Causes... - Page 68 Frequency data Causes Notes 5) f = 2n Misalignment. There is strong axial vibration. Mechanical looseness. Loose bolts, excessive play in the mobile parts and bearings, cracks and breaks in the structure: there are upper grade sub-harmonics. 6) f is an exact Roller bearings misaligned or forced Frequency = n x number of spheres or rollers.
- Page 69 2. TYPICAL SPECTRA OF VIBRATIONS RELATED TO THE MOST COMMON DEFECTS Note: The spectra are in an indicative graphic form. The N130 equipment produces a different form of graph. The following are the spectra of typical vibrations, caused by the most common defects found in practical experience.
- Page 70 3. MECHANICAL LOOSENESS 4. BELT 2x BELT FREQUENCY 5. GEARS GEAR MESH FREQUENCY SIDE BANDS C - 4 A rapid guide to interpreting a spectrum...
- Page 71 6. SLEEVE BEARINGS 7. ROLLER BEARINGS TYPICAL FREQUENCIES OF BEARING DEFECTS 8. ELECTRIC MOTORS 2x LINE FREQUENCY A rapid guide to interpreting a spectrum C - 5...
- Page 72 3. FORMULAE FOR CALCULATING TYPICAL BEARING DEFECT FREQUENCIES The most common case: a - fixed external ring (rotating internal ring) Housing frequency ...
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Page 73: Specifications
920X30025 Distance from target: 60 ÷ 1000 mm Current consuption: 30mA nominal Spare parts: CEMB sensor only, code: 800625310 CEMB cable 2 meters only, code: 962020718 Connections: PINOUT CONNETTOR (Yellow connector) 1 - +24 VDC 5 – TACHO IN 8 - GROUND + SHIELDING Reflector position on rotor or shaft: 1. - Page 74 (colored adhesive tape, matte paint marker, etc.). Caution: If there is more than one target the speed detected will not be the correct one. D - 2 Photocell for instruments CEMB Nx30...
- Page 75 Appendix E The JSON format The N130 uses JSON files to store the different measures. JSON (JavaScript Object Notation) is an open standard format for data exchange. For people it is easy to read and write, while for machines it is easy to generate and analyze. JSON is a text format completely independent of the programming language.
- Page 76 N130-GL measurement archive The N130-GL device organizes the measurement archive in projects. Each project is saved in a different JSON file, whose name is the name chosen for the project. All projects are available on the device, within the folder <N130\archive>.
- Page 77 All measurements have common information: An object called "measureType" whose value is a string corresponding to the measure type o OVERALL measurement saved in the Vibrometer function o SYNC 1x measurement saved in the Vibrometer 1xRPM function o FFT measurement saved in the FFT function o SMART ANALYSIS measurement saved in the Smart Analysis function...
- Page 78 SYNC 1x "amplitude":{ "value":9.6, "unit":"mm/s", "unit mode":"RMS" "frequency":{ "value":1650.0, "unit":"rpm" "phase":39.7, "dateTime":"2018-12-19T11:06:29", "setup":{ "max frequency":{ "value":1000.0, "unit":"Hz" "high-pass frequency":{ "value":10.0, "unit":"Hz" "No. of lines":400, "No. of averages":2 "measureType":"SYNC 1x" "overall":{ "value":1.5, "unit":"mm/s", "unit mode":"RMS" "spectrum":{ "lines":[0.0,0.0, 0.0, … 0.0], "unit":"mm/s", "unit mode":"RMS", "df":{ "value":2.5,...
- Page 79 "No. of averages":2 "measureType":"FFT" The wheel balancing archive The N130-GL instrument organizes the archive of wheel balances in projects. All projects are saved in a single JSON file, available in the device <N130-GL\archive\balancing\grinding_wheels\GrindingBalancing.json>. The file is organized with a tree structure: •...
- Page 80 The various projects are saved with the following structure. GrindingBalancing Project "name":"project name", "data":{ "clockwise":true, "calibration":{ "calibration runs":[ "done":true, "Sync 1x vibration":{ "amplitude":{ "value":2.5, "unit":"mm/s", "unit mode":"RMS" "phase":199.0 "speed":{ "value":1890.0, "unit":"rpm" "trial weights":[0.0,180.0], "done":true, "Sync 1x vibration":{ "amplitude":{ "value":4.8, "unit":"mm/s", "unit mode":"RMS"...
- Page 81 "speeds":[ "value":1890.0, "unit":"rpm" "value":1895.0, "unit":"rpm" "correction weights":[[31.75,355.21]] "dateTime":"2019-03-14T10:00:00" The JSON format E - 7...
- Page 82 Empty page E - 8 The JSON format...
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