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CEMB N600 Use And Maintenance Instruction Manual

Dual channel spectrum analyzer and balancing
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Vibration equipment division
N600
D
ual chaNNel spectrum aNalyzer
B
aND
alaNciNg
u
se aND maiNteNaNce iNstructioN maNual
CEMB S.p.A.
www.cemb.com
Via Risorgimento, 9
23826 MANDELLO del LARIO (Lc) Italy
*Translation of the original instructions

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  • Page 1 Vibration equipment division N600 ual chaNNel spectrum aNalyzer alaNciNg se aND maiNteNaNce iNstructioN maNual CEMB S.p.A. www.cemb.com Via Risorgimento, 9 23826 MANDELLO del LARIO (Lc) Italy *Translation of the original instructions...
  • Page 3 Firmware Ibrometer mode iBroMeter eaSureMent Screen 5.1.1 irect printing oF the vibration value optional onitorinG in tiMe onitorinG in Speed FFt (F ourIer ransForm analyzer mode (fft) pectruM analySiS arMonic curSor aveforM function riGGer etup N600 - V .2.2 09/2015...
  • Page 4 MeaSureMent only for inStruMentS 10.14 B n300 n600 alancinG data only for inStruMentS 10.15 G eneration and printinG of certificateS reportS 10.16 G eneratinG and printinG Multiple MeaSureMent certificateS Multi report N600 - V .2.2 09/2015...
  • Page 5 GuIde to InterpretInG a spectrum Appendix D cemb n aser sensor For Instruments Appendix E nFormatIon related to tHe creatIon oF customIsed templates models For certIFIcates Generated by cemb n-p ro soFtware Attachment: Balancing accuracy for rigid rotors N600 - V .2.2 09/2015...
  • Page 6 N600 - V .2.2 09/2015...

  • Page 7: G Eneral Description

    The N600 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 Instead, to extract the connector, press its end part (blue or yellow) and at the same time pull the main body (grey), in order to release it. ———————————————————————————————————————————————————— warnInG! VoId pullInG tHe connector wItH Force beFore releasInG It as descrIbed aboVe otHerwIse tHere would be rIsk oF damaGInG It ———————————————————————————————————————————————————— N600 - V . 2.2 09/2015...

  • Page 9: B Attery

    Vibration equipment division attery The N600 instrument is provided with a built-in rechargeable lithium battery, which allows autonomy of more than eight 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.

  • Page 10: G Eneral Layout

    The control panel of the CEMB N600 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 11 The cursor passes on automatically to the next position after a pause of one second, or else after pressing ano- ther key. With it is possible to delete the character to the left of the cursor. For example, suppose we wish to enter the word “TUR-1” press: N600 - V . 2.2 09/2015...

  • Page 12: G Eneral Purpose Functions

    When there are more than six functions accessible from a certain screen, there are not enough function keys to correspond to them; in such cases the key is associatedwith Pressing of this key causes substitution of the functions corresponding to with another five. The original correspondence can be reset by again pressing N600 - V . 2.2 09/2015...

  • Page 13: F Unctions Operating On The Graphs

    The cursor can be shifted by one step to the right or to the left by using thefollowing keyse F1 or F3 respectively. For quick reaching of points from the current position, hold down F1 or F3 . With F2 cursor is removed. N600 - V . 2.2 09/2015...
  • Page 14 (or graphs). highest peaks are determined in relation to the highest value present in the spectrum hence in certain cases the list could contain less than peaks N600 - V . 2.2 09/2015...

  • Page 15: T O Save Measurements

    For the active one identiFiable by the symbol 2.2.4 o save measurements The N600 instrument, structured according to a route logic, allows easily saving acquired data; to this end, two different route types are available ( DATA MANAGER MODE • Soft route •...

  • Page 16: T O Capture And Save Displayed Images

    2.2.5 o capture and save displayed images In all screens of the N600 instrument, the image visible on the display can be captured with then saved in png format in an appropriate archive. This image can be used subsequently if required to accompany documentation produced by the operator.
  • Page 17 Vibration equipment division ome screen menu After fully switching on the N600 instrument, it shows its Home screen: which, besides showing a set of information: • manufacturer logo and name of the instrument • serial number (S/N) of the instrument •...

  • Page 18: Etup Mode

    General setup: configuration of the general operating parameters of the instrument. ensor setup The N600 instrument can be used with different types and models of sensors. Therefore in order to ensure correct measu- rement, it is necessary to preset exactly the type of sensitivity of the sensors actually connected.

  • Page 19: S Ensitivity Of The Sensor

    ’ F the photocell is not enabled when you select a program that requires its use a pop up will ask you to activate it N600 - V . 2.2 09/2015...

  • Page 20: M Easurement Setup

    This is the difference between the maximum and minimum values the vibration has reached in a certain time interval; for purely sinosoidal signals, it is simply equal to the RMS value multiplied by 2.82. It is normally used for displacement measurements. N600 - V . 2.2 09/2015...

  • Page 21: U Nit Of Frequency

    This is the maximum frequency involved in the phenomenon under examination; in practice, it is the maximum frequency viewable in the spectrum. You can choose from the default values 100, 500, 1000, 2500, 5000, 10000 Hz, based on which the N600 instrument selects the appropriate frequency for data acquisition. 1000 (60.000...

  • Page 22: G Eneral Etup

    • g; inc/s; mils : imperial units 4.3.5 ime zone Allows setting the time zone. This setting is important if the instrument is associated with the CEMB Advanced Diagnostic Software for data processing. 4.3.6 pdating oF Firmware Pressing of key does not set any parameter, but it does allow updating the program (firmware) inside the instrument, if this proves necessary.
  • Page 23 Is requested beFore actIVatInG tHIs procedure ———————————————————————————————————————————————————— Only the firmware obtained directly from CEMB Technical Service should be used. It is advisable to remove the USB key before rebooting the instrument. If using invalid firmware, the following pop-up will appear: ————————————————————————————————————————————————————...

  • Page 24: V Ibrometer Mode

    5.1.1 irect printing oF the viBration value optional By connecting the portable printer supplied (optional) then pressing F3 it is possible to print directly in field the vibration values displayed in the VIBROMETER PAGE. N600 - V . 2.2 09/2015...

  • Page 25: M Onitoring In Time

    In order to be able to use this function, it is essential to have the tachometric signal; therefore it is necessary: • to apply a reflecting label on the rotor as reference mark (0°). Starting from this position, proceed to measure the angles in direction opposite to that of the shaft rotation. N600 - V . 2.2 09/2015...
  • Page 26 If the operation is not regular, either retract or approach the photocell, or else incline it with the respect to the workpiece surface. - LASER SENSOR FOR CEMB APPENDIX D N INSTRUMENTS.
  • Page 27 Shifting of the cursor, which varies the frequency considered as fundamental, causes the automatic updating of the position of all the multiple ones. Use of the harmonic cursor allows easy recognition in the spectrum of families of peaks in correspondence of frequencies, N600 - V . 2.2 09/2015...

  • Page 28: Rigger S Etup

    In this mode, the N600 instrument can be used as an actual oscilloscope, and further enhances the variety of information which can be deduced from the vibration signals. This mode also contains all the typical graph control functions (...

  • Page 29: M Odes

    This indicates on which channel (Ch1 or Ch2) to make the comparison between the signal value and the threshold value in order to activate the acquisition. F just one oF the two measuring channels is enabled obviously choice oF the trigger channel is obligatory hence it is Forced automatically N600 - V . 2.2 09/2015...

  • Page 30: T Hreshold

    This is the level which the signal must exceed (in a leading edge of the waveform) in order for the acquisition to be started automatically. The selection of a suitable value is normally one of the most delicate operations, but by using the N600 instru- ment it is considerably simplified.

  • Page 31: B Alancer Mode

    The N600 instrument allows balancing any rotor under service conditions in one or two planes, by using one or two vibration pick-ups and a photocell.

  • Page 32: S Election Of The Balancing Program

    (high unbalance values) acquisition made with a narrow filter: suitable in most conditions acquisition made with a very narrow filter: suitable for particularly critical signal conditions (low unbalan- ce values); requires longer times N600 - V . 2.2 09/2015...

  • Page 33: L Oad Program From Archive

    Allows to export on a USB key connected to the instrument all balancing programs previously saved. It will create a file “Unb_Data.ini”, necessary to do custom balancing reports (using N-Pro software). N600 - V . 2.2 09/2015...

  • Page 34: C Alibration Sequence C

    • correction on two planes with two sensors The calibration sequence screen on the N600 instrument is organized as in the figures: 1. number and name of the balancing program (if loaded from the archive), or else ---- 2. current speed of rotation, in RPM 3.

  • Page 35: E Xecution Of Measurement

    Calibration requires the use of a test weight, to be applied in succession on the various correction planes. These two para- meters should be preset, with the appropriate functions F2 and F3 by typing the appropriate values with the numeric keypad, and confirming with N600 - V . 2.2 09/2015...
  • Page 36 1. number and name of the balancing program (when loaded from the archive), otherwise ---- 2. current speed of rotation, in RPM 3. layout of the position of the sensors and correction planes on the rotor N600 - V . 2.2 09/2015...
  • Page 37 After making the corrections indicated, the measurement-correction procedure can be repeated until the required conditions are met (typically vibration measured by the sensors lower than a certain value). N600 - V . 2.2 09/2015...
  • Page 38 The split function of the N600 function calculates the weights to be applied or to remove corresponding to any two positions α1 and α2, so that their effects are equivalent to those of the correction calculated by the balancing algorithm.

  • Page 39: S Aving Of A Balancing Program

    KEYPAD Instead, when F3 is pressed, the selected program can be eliminated, provided it is not the current one. With F4 it is possible to eliminate all the balancing programs contained in the archive. N600 - V . 2.2 09/2015...

  • Page 40: D Ata Manager Mode

    The N600 instrument operates following a route logic in which all the data processed and collected by the measuring instru- ment can be saved. These routes are divided into two distinct types: • Soft Route (can be created with the RouteManager software). You can create a “simplified” route directly on the instru-...

  • Page 41: Hange Selected Points

    N600 - V . 2.2 09/2015...

  • Page 42: N Ew Project

    From This function allows copying all the projects saved on the USB key inserted in the N600 instrument to its internal memory. A pop-up will inform you when the operation has successfully been completed. Confirm by pressing As the instrument is characterised by a Windows-based operating system, any USB key formatted with this system can be connected to the instrument.

  • Page 43: D Elete Projects

    Project List using the arrows and select the project you want to delete. You can delete all the projects saved in the instrument by pressing F6 ou cannot delete the currently active project From the list N600 - V . 2.2 09/2015...

  • Page 44: A Rchive Function

    FunctIon The N600 instrument allows viewing and managing screenshots previously stored by pressing , using this specific function directly accessible from the start screen. Pressing F6 an ARCHIVE screen is shown where you can select from two options: •...

  • Page 45: Elete Screenshots

    Folder named with the date and time buttons which respectively increase and decrease the position selected by can be used to quickly scroll through the archive N600 - V . 2.2 09/2015...

  • Page 46: S Ystem Requirements

    PrograM oPtioNal Data saved in the N100, N300 and N600 instruments can easily be imported into a PC, organised and saved to the hard disk and subsequently analysed, compared, printed, etc. These operations are made possible thanks to CEMB N-Pro software (Professional Environment for N-Instruments), avai- lable for Microsoft Windows operating systems.
  • Page 47 1.3.4 or EarliEr Do not connect the N instrument to the PC using the USB cable supplied until the CEMB N-Pro software has been correctly installed; after a few seconds the following message will appear: New hardware found USB <->...
  • Page 48 Correct communication between the PC and the N100, N300, N600 instruments is now possible. o iNsTall The sofTware aNd drivers correcTly you musT have admiNisTraTor righTs oN The used This is possiBle wheN you logiN as The dmiNisTraTor 10.4 N100...

  • Page 49: A Ctivating The Software

    This can be obtained by sending an e-mail to CEMB customer service Vibration Analysis division (www.cemb.com) specifying the subject: “CEMB N-Pro activation code” and specifying in the message your data and the serial number (S/N) as shown in the pop-up.

  • Page 50: U Se Of The Software

    10.6 se oF tHe soFtware The buttons on the function bar in the upper part of the page allow full access to all of the functions available in the CEMB N-Pro software. The data record contents are always visible on the left, subdivided into: •...
  • Page 51 N instrument using a USB connection • Function for importing data from the N600 instrument: starts the automatic procedure for importing data from the N600 instrument (data previously exported on USB key General functions: •...
  • Page 52 Instrument After connecting the N instrument to the PC, checking and if necessary changing the USB port setting, the CEMB N-Pro software can be used to automatically read all of the measurements contained in the instrument’s records, by simply pres- sing .
  • Page 53 From tHe Instrument After exporting on a USB key the Route (file named *.ads) on which are stored the data collected with N600 instrument, connect the key to the PC USB port. Select the icon: a popup will confirm the export of file *.ads: This procedure creates inside the archive “vibration”...

  • Page 54: D Isplaying Data Present In The Records

    (autoscale) : by clicking on the graph the extremes of the axes will automatically be set to the most suitable values, based on that displayed > (zoom in) : clicking in one point enlarges the zone around it > (zoom out) : clicking in one point displays a larger area around it. N600 - V . 2.2 09/2015...
  • Page 55 For Instruments 1. amplitude of the synchronous vibration value 2. phase of the synchronous vibration value 3. frequency of the synchronous vibration value 4. measurement information and parameters 5. notes associated with the measurements N600 - V . 2.2 09/2015...

  • Page 56: G Eneration And Printing Of Certificates ( )

    (template) for the certificate to be generated. The model is a simple HTML file that the same user can create and customise to suit his own needs using any HTML editor. The CEMB N- Pro program generates the report automatically replacing some preset codes in the template with the corresponding values of the measurement displayed.
  • Page 57 2. press the button 3. select the desired template he description list and meaning oF codes that can be used in multi report templates are shown in ppendix N600 - V . 2.2 09/2015...
  • Page 58 Total vibration monitoring in relation to time or speed (Bode diagram) • Balancing of rotors in operating condition (1 or 2 planes) • Waveform Measurement mode • Effective value (RMS) • Peak value (Pk) • Peak-to-peak value (PP) N600 - V . 2.2 09/2015...
  • Page 59 Number of correction planes: 1 to 2 • Graphic measurement stability indicator • Step-by-step guided balancing procedure with the possibility of interim editing and modifications • Vectorial unbalance split • Correction by adding or removing material N600 - V . 2.2 09/2015...
  • Page 60 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 N600 - V . 2.2 09/2015...
  • Page 61 In these cases, the machine manufacturer generally needs to explain the reasons and, in particular, confirm that the machine would not be damaged by operation at higher vibration values. N600 - V . 2.2 09/2015...
  • Page 62 Classification of the vibration severity zones for Group 4 machines: Pumps with fin rotors and incorporated motor (mixed or axial flow centrifugal pumps) with nominal power above 15 kW Support class Zone limit Effective displacement, µm Effective speed (mm/s) N600 - V . 2.2 09/2015...
  • Page 63 Vibration equipment division Rigid Flexible N600 - V . 2.2 09/2015...
  • Page 64 An unbalance vibration often also intervenes Alternating forces Second and third harmonic present 2) f ≅ n with knocking Mechanical unbalance defect In asynchronous motors, the knocking is due to superimposed on irregular running magnetic field N600 - V . 2.2 09/2015...
  • Page 65 D n / l (D = pulley diameter; l = belt length) Considerable axial vibrations, more than 10% of the transverse vibration, may be caused typically by: • misalignment (more than 40%) • shaft inflection, especially in electrical motors • defective thrust bearings N600 - V . 2.2 09/2015...
  • Page 66 Form oF graph The following are the spectra of typical vibrations, caused by the most common defects found in practical experience. CPM = shaft rotation speed in rpm UNBALANCE MISALIGNMENT MECHANICAL LOOSENESS/PLAY N600 - V . 2.2 09/2015...
  • Page 67 Vibration equipment division BELT GEARS SLEEVE BEARINGS ROLLER BEARINGS N600 - V . 2.2 09/2015...
  • Page 68 - rotating external ring (fixed internal ring)     ⋅ ⋅  Θ            BPFO ⋅ ⋅ − ⋅  Θ        N600 - V . 2.2 09/2015...
  • Page 69 BPFI = 0.6 x N x S (a) or (b) = 0.23 x N x S (N < 10) (a) or (b) = 0.18 x N x S (N ≥ 10) (a) or (b) N600 - V . 2.2 09/2015...
  • Page 70 For Instruments Specifications CEMB complete code: 9206812659 Distance from target: 100 - 2000 mm nominal Current: 30mA nominal Spare parts CEMB sensor only, code: 800625541 CEMB cable only, code: 962600025 Connections Pin 1 Brown Positive power Pin 3 White Earth...
  • Page 71 When the certificate is created, the CEMB N-Pro software automatically replaces some of the default codes in the template (#x# format) with corresponding information related to the measurements displayed at the time. To ensure they are replaced correctly, only the following codes should be used:...
  • Page 72 Vibration peak 5 frequency – channel A #426# Vibration peak 1 value – channel A #427# Vibration peak 2 value – channel A #...# Vibration peak … value – channel A #430# Vibration peak 5 value – channel A N600 - V . 2.2 09/2015...
  • Page 73 (1, 2, … N) For example: > #6-1# : name of measurement No. 1 of the multi-report > #11-2# : type of measurement No. 2 of the multi-report > … N600 - V . 2.2 09/2015...
  • Page 74 The HTML model (template) used to create the certificates leaves clients free to customise the certificates distributed by CEMB together with the program, or to create new ones as desired. Clients with special requirements can insert logos or images and change the size and colour of the wording themselves.
  • Page 75 23826 MANDELLO DEL LARIO (LC) ITALY BALANCING ACCURACY OF RIGID ROTORS are different according to whether the rotor may be considered The purpose of balancing is to improve the distribution of rigid or flexible, similarly, the balancing accuracy or tolerance the mass of a rotor so that it may rotate on its bearings without creating unbalance centrifugal forces higher than is different in the two cases.
  • Page 76 BALANCE QUALITY GRADES FOR VARIOUS GROUPS OF ROTORS Note: The rotor classes in italics are not included in the ISO standards, but have been added by the Author. Grade ROTOR TYPE mm/s Gyroscopes Spindles, discs and armature of precision grinders Spinning spindles Small electrical armatures with high level balancing requirements Tape-recorder and phonograph (gramophone) drivers, cinema projectors...
  • Page 77 HOW TO USE THE BALANCING TOLERANCE GRAPH The balancing quality grade G is determined according to the The balancing tolerance in gr·mm may be obtained from the characteristics of the rotor and the machine on which the rotor residual eccentricity e (micrometers) multiplied by the rotor is mounted under normal service conditions (see table).
  • Page 78 CONDITIONS OF VALIDITY OF THE BALANCING TOLERANCE GRAPH 1. The balancing values refer to the entire rotor; if there are two DIVIDING THE PERMISSIBILE RESIDUAL planes of correction and if the rotor is approximately symmetrical, UNBALANCE BETWEEN TWO CORRECTION each correction plane should be allotted a tolerance value equal PLANES to half the value found, as long as the correction planes are In most rotors, a reasonable division of the total permissible...
  • Page 79 Unbalance to remove P = 10 grams. Drill bit used d = 14 mm. The general method is set out in CEMB Technical Booklet Rotor material ALUMINIUM. Corrected P value = 10x2.91 = N° 8 (which can be sent f.o.c. on request), and in International 29.1 Diagram 1 gives us h = 27 mm...
  • Page 81 1 - GENERAL DIAGRAM OF WEIGHT REMOVABLE BY DRILLING IN STEEL (For small weight see diagrams 2 – 3 – 4 – 5) Hole depth (h) in mm...
  • Page 82 2 - DIAGRAM FOR FINE DRILLING Ø 0,5 – 1,5 mm Hole depth (h) in mm...
  • Page 83 3 - DIAGRAM FOR FINE DRILLING Ø 1 – 6 mm Hole depth (h) in mm...
  • Page 84 4 - DIAGRAM FOR FINE DRILLING Ø 2 – 10 mm Hole depth (h) in mm...
  • Page 85 5 - DIAGRAM FOR FINE DRILLING Ø 5 – 12 mm Hole depth (h) in mm...
  • Page 86 6 - DIAGRAM OF WEIGHT per cm OF A STEEL PLATE AS A FUNCTION OF DIMENSIONS L - s Width of plate (L) in mm Thickness of plate (s) in mm...

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