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VIBXPERT
FFT Data Collector &
Signal Analyzer
'Balancing'
Operating Instructions
Version 2.3x
Edition November 2010
VIB 9.806.G
®
Dear customer,
We are grateful for your trust and hope that you
are happy with our product. If you have any
suggestions for improving this product or this
instruction manual, please let us know.
PRÜFTECHNIK
Condition Monitoring
Fax: +49 89 99616-300
eMail: info@pruftechnik.com
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Related Manuals for PRÜFTECHNIK VIBXPERT Balancing
Summary of Contents for PRÜFTECHNIK VIBXPERT Balancing
- Page 1 ® VIBXPERT FFT Data Collector & Signal Analyzer 'Balancing' Operating Instructions Dear customer, We are grateful for your trust and hope that you are happy with our product. If you have any suggestions for improving this product or this instruction manual, please let us know. PRÜFTECHNIK Condition Monitoring Version 2.3x...
- Page 2 Both this manual and the product it describes are copyrighted. All rights belong to the publisher. The manual may not be copied, reproduced, translated or made accessible to a third party in any form, neither in its entirety nor as an excerpt. No liability may be claimed against the publisher regarding the product described in this manual.
- Page 3 Foreword Foreword Congratulations! And thank you for choosing the dynamic balancing * Also called 'VIBXPERT' and 'measure- option in one or two planes to expand your VIBXPERT FFT data ment instrument' in this manual. collector and signal analyzer*. The balancing module is based on the well-known "influencing coefficients method"...
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Page 4: Table Of Contents
Contents Contents Chapter 1: Introduction ..........1-5 Intended use ....................1-5 Symbols ......................1-5 Safety .................... 1-6 Scope of delivery................1-7 Registration .................. 1-8 Chapter 2: Balancing ..........2-1 Balancing on machines with rotating masses ..........2-3 Diagnosis ..................2-4 Preparatory activities .............. -
Page 5: Chapter 1: Introduction
Introduction Chapter 1: Introduction Intended use VIBXPERT is intended for use as a portable balancing device for the balancing of stationary machines equipped solely with rotating components (rotors), e.g. turbine rotors, inductors, circulating pumps, centrifugal compressors, fans, etc. This does not include machines with oscillating components, e.g. -
Page 6: Safety
Safety Safety You must carefully read and understand the safety instructions in the VIBXPERT operating manual (VIB 9.805.G) as well as the following safety instructions for balancing before starting work with the measurement device. • When assembling measurement components, make sure that no holders, cables, etc. -
Page 7: Scope Of Delivery
Scope of delivery Scope of delivery The components described below are included in the scope of delivery. If a part is missing or is damaged, please contact your PRÜFTECHNIK representative immediately. Transducer set for balancing with 1-channel instrument - VIB 5.387-HW VIB 3.306 Reflective tape, 10 mm VIB 3.420... -
Page 8: Registration
Registration Registration The balancing software is already contained in the instrument and must be activated by entering a password. Changes to the instrument or the loading of additional software are not necessary. Entering the password The password is given on the password certificate (VIB 5.386-B) contained in the scope of delivery of the balancing module (VIB 5.386-FM, see below). -
Page 9: Chapter 2: Balancing
Balancing: Introduction Chapter 2: Balancing Increased vibrations on machines are undesirable phenomena. They impair product quality, place additional strain on components and, last but not least, reduce operational safety. The most frequent cause for these increased vibrations is imbalance. The high centrifugal forces that result lead to premature wear of machine components such as bearings and seals, for example. - Page 10 Balancing: Introduction If an individual imbalance which does not lie on the center of gravity is added to a completely balanced rotor in one plane, it is called a quasi static imbalance. It corresponds to the combination of a static imblance and a couple imbalance and is usually compensated in two planes.
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Page 11: Balancing On Machines With Rotating Masses
Balancing: Introduction Balancing on machines with rotating masses The VIBXPERT balancing module is based on the well-known 'influence coefficients method': First, VIBXPERT measures the vibration amplitude and phase angle and the vibration caused by the imbalance or so-called 'initial imbalance'. A defined trial weight* is then attached and the instru- ment measures the resulting change in amplitude and phase. -
Page 12: Diagnosis
Balancing: Introduction Diagnosis Before beginning the balancing procedure, first make sure that the cause for the adversely affected smooth running of the rotors is actually an imbalance. Furthermore, a vibration diagnosis indicates which balancing method is the most suitable. A series of coordinated measurement tasks are available for the diagnosis of an imbalance: •... -
Page 13: Preparatory Activities
Balancing: Preparations Preparatory activities The preparations include the mounting of the measurement compo- nents. The machine must be disconnected before carrying out any work on the machine and it must be protected against being switched on again inadvertently! WARNING! Assembly 1. - Page 14 Balancing: Preparations 3. Assess the machine smoothness. Measure the vibration velocity and record an FFT spectrum if the measurement values are too high (see DIN ISO 10816-3). If high vibration signals appear at the rotational frequency, there is an imbalance that must be corrected by balancing. Save the measured values in order to be able to compare them later with the values measured after the balancing procedure.
- Page 15 Balancing: Preparations 5. Mount the laser trigger sensor with the trigger bracket (VIB 6.632) according to the following figure. Installation notes: • The machine is switched off during the installation. • The maximum distance to the shaft is 2 meters. •...
- Page 16 Balancing: Preparations After completing the preparatory activities, ensure the following: • The balancing RPM should lie as close as possible to the Note operating RPM. If this is not possible due to high vibration values, start at a lower RPM and approach the operating RPM step-by-step in several balancing runs.
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Page 17: Operation
Balancing: Operation Operation If you are not yet familiar with operation in balancing mode, please note the following instructions: Settings All settings necessary for the measurement and evaluation of a balancing run are made in setup menus: - Measurement setup: measurement settings (see p. 2-29) - Transducer setup: parameters of the transducer in use - Machine setup: data on rotor and balancing-related settings (see p. - Page 18 2-10 Balancing: Operation The respective balancing step appears on the upper left of both screens: - 0. Initial imbalance: Measurement of the original imbalance; if the vibration values are within the tolerance range, the rotor is balanced. Otherwise, the balancing weights must be placed on the rotor according to the following balancing steps.
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Page 19: Balancing In One Plane
2-11 Balancing: 1-plane Balancing in one plane On the basis of an example, the next section illustrates the steps that are needed to balance in one plane: Requirements - In the following example, the machine setup is not used. - The default settings in the 'Tools' menu item are not changed: - Correction mode: free - "Add"... -
Page 20: Trial Run
2-12 Balancing: 1-plane First, VIBXPERT records the RPM. The green LED flashes with each trigger pulse. If the RPM varies too much, a warning message appears. Finally, the instrument measures the amplitude and phase of the RPM synchronous vibration. If the values are unstable, the average is automatically increased. -
Page 21: Trim Run
2-13 Balancing: 1-plane 5. Press the joystick to start the measurement. 6. If the measurement values are stable, press the joystick to stop the measurement. 7. Switch the machine off. In the trial run the imbalance should change enough to steadily reduce the residual imbalance in the subsequent balancing runs. -
Page 22: Undoing Balancing Runs
2-14 Balancing: 1-plane In the following trim runs VIBXPERT checks whether the imbalance has sufficiently reduced from one run to the next. If this is not the case, the following message appears: ‘No Improvement’. The run concerned must be repeated with a different balancing weight. ... -
Page 23: Balancing In Two Planes
2-15 Balancing: 2-plane Balancing in two planes In principle, the process here corresponds to the previous section. Therefore, only the specific features of balancing in two planes are described in the following section: Overview of the measurement procedure Plane A? : Determination of the measurement and balancing plane A. 0. -
Page 24: Trial Run
2-16 Balancing: 2-plane Trial run The trial run is divided into two parts which are marked in the main screen as "1A" or "1B": 1A: The trial weight is attached in plane A and its influence is measured in both planes. 1B: The trial weight is attached in plane B and its influence measured in both planes. -
Page 25: Evaluation Of The Data
2-17 Balancing: Evaluation Evaluation of the data The following data are listed in the data screen for each completed balancing run: : Mass of the balancing weight : Fixing angle NGLE : Vibration overall values (RMS) IBRATION : Phase angle NGLE If you entered the rotor mass and the balancing radius, the achieved balancing quality and the centrifugal force on the rotor are also... -
Page 26: Combining Balancing Weights
2-18 Balancing: Evaluation Combining balancing weights If several weights have already been placed on the rotor, they can be combined into one single weight. VIBXPERT vectorially adds the weights of the completed balancing runs and displays the resulting weight and fixing angle in the 'Data' screen and the 'Data View' screen. -
Page 27: Options For Balancing
2-19 Balancing: Options Options for balancing The following options are available in the trial run and the trim runs: Checking the measurement setting • Press the MENU button and click on "Task Manager". • Mark the respective setup, press the MENU button and click on "Show"... -
Page 28: Fixed Weight
2-20 Balancing: Options Fixed weight Activate the "Fixed weight" option if only specific masses (e.g. 2g, 5g, 10g) are available for balancing. Then enter the mass of the "Fixed weight". VIBXPERT calculates two angular positions at which the two equal weights must be placed. "Free"... -
Page 29: Removing The Balancing Weight
2-21 Balancing: Options Removing the balancing weight If the balancing weights cannot be attached to the rotor by clamping, welding, screwing or similar, the imbalance can also be compensated by grinding material off the rotor. To do this, select the "Trial/ Trim masses ->... -
Page 30: Entering The Balancing Radius And Rotor Mass Later
2-22 Balancing: Options Entering the balancing radius and rotor mass later You can enter the balancing radius and the rotor mass later in the Tools menu to have the achieved balancing quality and the centrifu- gal force calculated. In this way, these values will be available to you if you start the balancing procedure without the machine setup. -
Page 31: Minimizing Vibrations At The Control Plane
2-23 Balancing: Options • Press the MENU button and click on 'Restart'. A warning appears. Click on 'OK'. • Start the balancing measurement ('Initial imbalance'). In variant 2, the coefficient must be stored after the trial run of the particular balancing measurement. -
Page 32: Display Setup
2-24 Balancing: Display-Setup Display setup In the display setup, you can define the display settings for the data screen and measurement screen. The display setup can be called up on every screen: • Press the MENU button and click on 'Display setup'. : Speed or step size when zooming. -
Page 33: Printing The Balancing Report
2-25 Balancing: Printing Printing the balancing report Two different report types are available for documenting the balanc- ing measurements: - Screenshot: Printout of the current screen - Report printouts: Detailed report printout with general measure- ment data and balancing-related data. A report printout can be started from the measurement or data screen: Screenshot:... -
Page 34: Setup Parameters
2-26 Balancing: Machine setup Setup parameters This section describes the measurement settings that you generally can only edit before beginning a balance measurement. The parame- ters are contained in the 'Setup menu': - Machine setup (see below) - Measurement setup (see p. 2-28) - Transducer setup (see VIBXPERT operating manual, page 2-20) Machine setup A 'machine setup' contains the machine data and information on the... - Page 35 2-27 Balancing: Machine setup - Fixed weight: Mass of the available balancing weight. - Outer diameter: The tape measure can be used to determine the position of the balancing weight without a reference angle (see graphic on page 2-20). * This parameter can be changed in *: add / remove;...
- Page 36 2-28 Balancing: Machine setup RPM: Balancing RPM; should be as close as possible to the operating RPM. When balancing with the factory-set RPM setup, only one trigger pulse is processed per revolution. Ensure that only one trigger mark is placed on the shaft. *: Yes / No;...
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Page 37: Measurement Setup
2-29 Balancing: Measurement setup Measurement setup When creating a new measurement setup, the following parameters can be edited: : 0.5 / 1 / 2 / 10 Hz; select "10 Hz" as the lowest frequency if the ILTER machine RPM is more than 600 RPM and the machine is placed on a flexible foundation. -
Page 38: Balancing With A Control Plane
2-30 Balancing: Control plane Balancing with a control plane While balancing in one plane, the vibration pointer in a second plane - the control plane - can be recorded and displayed as well. Activating the control plane You can activate recording of the vibration and phase values for the control plane (see p. -
Page 39: Chapter 3: Appendix
Appendix Chapter 3: Appendix This section contains the following information: - Overview of the quality classes according to DIN ISO 1940. This enables the user to set up the balancing quality in the machine setup. - Messages that may appear during the balancing procedure. Balancing quality classes and groups of rigid balancing bodies (excerpt from DIN ISO 1940) Qty. -
Page 40: Messages During Balancing
Appendix Messages during balancing Insufficient improvement The vibration values are greater than 1 mm/s and have not sufficiently improved. Check whether the cause is actually an imbalance. One-plane balancing is recommended The dynamic portion of the calculated balancing weight is larger than the static portion. - Page 41 Appendix Pointer change too large The vibration pointer in the trial run has changed too much in magnitude and phase in comparison to the initial imbalance run. Pointer change too small The vibration pointer in the trial run has not changed enough in magnitude and phase in comparison to the initial imbalance run.
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Page 42: Emergency Storage
Appendix Emergency storage If the balancing procedure is stopped prematurely (e.g. battery discharged), the data are stored in a recovery file. When the device is switched on again, the balancing procedure can be continued with the aid of this recovery file. Opening the recovery file •... - Page 43 empty page...
- Page 44 Productive maintenance technology PRÜFTECHNIK Condition Monitoring Oskar-Messterstr. 19-21 85737 Ismaning, Germany www.pruftechnik.com Tel. +49 89 99 61 6-0 Fax +49 89 99 61 6-300 eMail: info@pruftechnik.com Printed in Germany VIB 9.806.11.2010.0G VIBXPERT ® , OMNITREND ® are registered trademarks of PRÜF- TECHNIK AG.
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