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Summary of Contents for Hofmann EasyBalancer EB 3500
- Page 1 Operating Instructions Vibration testing and balancing device EasyBalancer EB 3500 370-3501-en Rev. 1.1 202106 Translation of the original operation manual Hofmann Mess- und Auswuchttechnik GmbH & Co. KG I 64319 Pfungstadt I Germany I www.hofmann-global.com...
- Page 2 All rights reserved. No part of this document may be reproduced in any form (print, photocopy, microfilm or by any other means), nor stored, processed, copied or distributed by electronic sys- tems, without written permission from Hofmann Mess- und Auswuchttechnik GmbH & Co. KG. Keep the operation manual in a safe place for future use.
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Page 3: Table Of Contents
EasyBalancer EB 3500 Table of contents Table of Contents General information ............1 - 1 Manufacturer and designation . - Page 4 Opening and operating Hofmann Reporting ........6...
- Page 5 EasyBalancer EB 3500 Table of contents 10 Evaluation ............. . . 10 - 1 10.1 Performing vibration measurements .
- Page 6 Table of contents EasyBalancer EB 3500...
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Page 7: General Information
- Manufacturer and designation General information Manufacturer and designation The Vibration testing and balancing device was built by: Hofmann Mess- und Auswuchttechnik GmbH & Co. KG Werner-von-Siemens Straße 21 D-64319 Pfungstadt, Germany and its full designation is: Vibration testing and balancing device EasyBalancer EB 3500 ... -
Page 8: Industrial Property Rights
- Industrial property rights EasyBalancer EB 3500 Industrial property rights The Vibration testing and balancing device EasyBalancer EB 3500 is the intellectual property of Hofmann Mess- und Auswuchttechnik GmbH & Co. KG. All rights to the Vibration testing and balancing device, the meas- uring principle, associated drawings etc. -
Page 9: Ec Declaration Of Conformity
General information EasyBalancer EB 3500 - EC declaration of conformity EC declaration of conformity 1 - 3... -
Page 10: Information About This Operating Manual
General information - Information about this operating manual EasyBalancer EB 3500 Information about this operating manual This operating manual is part of the scope of delivery and con- tains important information on how to correctly operate the equip- ment and make full use of its functions. -
Page 11: Keywords In Safety Instructions And What They Mean
General information EasyBalancer EB 3500 - Information about this operating manual 1.5.4 Keywords in safety instructions and what they mean IMPORTANT Indicates a risk of material or environmental damage. CAUTION Indicates a potentially dangerous situation. Ignoring this instruction could lead to minor injury. -
Page 12: Disposal
Use existing systems for separate collection of devices and batteries / rechargeable batteries or send the device to be disposed of to the following address: Hofmann Mess- und Auswuchttechnik GmbH & Co. KG Werner-von-Siemens Straße 21 D-64319 Pfungstadt, Germany... -
Page 13: Safety Information
Safety information EasyBalancer EB 3500 - Operating the device on machines Safety information INFORMATION The instructions in the operating manual are by no means exhaustive. The device is built using state-of-the-art technology according to recognised safety rules, and is safe to operate. -
Page 14: Requirements For Personnel
Safety information - Operating the device on machines EasyBalancer EB 3500 DANGER General hazard The machine on which the device is to be used may pose hazards if it is operated inappropriately or not kept in proper condition. The operating company may only operate the ma- chine if it is in perfect condition. -
Page 15: Appropriate Use
Safety information EasyBalancer EB 3500 - Appropriate use Appropriate use 2.2.1 Purpose See Chapter 3.3 Purpose ATTENTION Any other use is regarded as improper. 2.2.2 Permitted use The device is intended exclusively for the intended use according to the description and designation. -
Page 16: Duties Of The Operating Company
Safety information - Duties of the operating company EasyBalancer EB 3500 Duties of the operating company INFORMATION Due to various safety laws, the operating company is required to prepare instructions for the staff and to ensure safe operation of the device. -
Page 17: Warranty And Liability
Safety information EasyBalancer EB 3500 - Warranty and liability Warranty and liability The warranty and liability is based on the contractually agreed terms. INFORMATION Damage caused by improper operation or operator error is not covered by the warranty obligations of the manufacturer. - Page 18 Safety information - Cleaning agents EasyBalancer EB 3500 2 - 6...
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Page 19: Vibration Testing And Balancing Device
After delivery, immediately notify the shipper and manufac- turer of any damage due to defective packaging or transport. Fig. 3-1: Equipment set 1 - EasyBalancer EB 3500 2 - Speed sensor connection cable 3 - Vibration sensors 4 - Power supply and charger... -
Page 20: Storage And Preservation
We provide no guarantee for corrosion damage caused by inap- propriate storage. Purpose The EasyBalancer EB 3500 Vibration testing and balancing de- vice is designed for measuring and analysing mechanical vibra- tions and for operational balancing in industrial environments. In particular, the following tasks can be carried out with the EasyBalancer EB 3500: ... -
Page 21: Features And Benefits
The data of a measurement or balancing task are stored in the EasyBalancer EB 3500. The measured data can be transferred to a PC via a USB interface. A PC program is included in the scope of delivery, with the aid of which cus- tomer-specific measurement reports can easily be created. -
Page 22: Connections
Vibration testing and balancing device - Connections EasyBalancer EB 3500 Connections Fig. 3-2: EasyBalancer EB 3500 connections, top Vibration sensor input Photo and laser speed sensor USB 2.0 mini-B interface for transferring measured data to a PC Battery state of charge indicator lamp... -
Page 23: Measurement Setup, Example
- Measurement setup, example Measurement setup, example Fig. 3-4: Measurement setup, example 1 - Machine / rotor (grinding wheel) 2 - EasyBalancer EB 3500 3 - Scale ring (optional) 4 - Vibration sensors 5 - Speed sensor 6 - Connection cable for vibration sensor... -
Page 24: Setup Instructions
3.7.1.1 Acceleration sensors INFORMATION Acceleration sensors are also designed for certain measuring ranges. Hofmann acceleration sensors, types 1130/1140, 1135, 1830 and 1835, must not be subjected to acceleration greater than 50 g. Such high acceleration levels can occur, for example, if a sensor falls or if a magnetic base is used and it is not secure. - Page 25 Vibration testing and balancing device EasyBalancer EB 3500 - Setup instructions 3.7.1.2 Positioning the vibration sensors DANGER Risk of entanglement or entrapment When positioning the sensors, make sure the cables are not caught in or on rotating parts. Arrange the cables so that they cannot be pulled in or entangled by rotating parts.
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Page 26: Speed Sensor
Vibration testing and balancing device - Setup instructions EasyBalancer EB 3500 3.7.2 Speed sensor The speed sensor is designed as a photo-reflexive probe with a visible light spot. To record the speed, a speed mark is scanned, which is attached to the rotating shaft of the machine to be exam- ined/balanced. - Page 27 Vibration testing and balancing device EasyBalancer EB 3500 - Setup instructions If, for example, the shaft has a rough surface (bright) and the marking has an equally bright but smooth surface, speed detection is possible without problems. INFORMATION During balancing, the “zero position” from which the angle for un- balance correction is counted is determined by the position of the test weight.
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Page 28: Laser Speed Sensor (Optional)
Vibration testing and balancing device - Setup instructions EasyBalancer EB 3500 3.7.3 Laser speed sensor (optional) DANGER Danger from laser beam Do not look directly into the laser beam. Do not point it at other persons. The lens of the probe must not be replaced. -
Page 29: Balancing System Parameters
Vibration testing and balancing device EasyBalancer EB 3500 - Setup instructions 3.7.4 Balancing system parameters Fig. 3-6: Balancing system parameters U = M * e U = m * r = 2 * * n/60, n in [rpm] F = U *... -
Page 30: Direction Of Rotation And Angular Position For Unbalance Correction
Vibration testing and balancing device - Setup instructions EasyBalancer EB 3500 3.7.5 Direction of rotation and angular position for unbalance correction Depending on the setting of the counting direction, the degrees can be set against the direction of rotation or in the direction of rotation of the rotor. -
Page 31: Unbalance Of Rigid Rotors
Vibration testing and balancing device EasyBalancer EB 3500 - Setup instructions 3.7.6 Unbalance of rigid rotors Static unbalance If a rotor has a single unbalance in the radial plane in which its centre of gravity lies, this is referred to as a static unbalance... -
Page 32: Balancing Methods
Vibration testing and balancing device - Setup instructions EasyBalancer EB 3500 3.7.7 Balancing methods Spread angle balancing method The spread angle balancing method is mainly used to compensate unbalance on grinding wheels. Geometric addition of the unbal- ance of the two (three) sliding weights (m... -
Page 33: Calibration
Vibration testing and balancing device EasyBalancer EB 3500 - Setup instructions 3.7.8 Calibration Calibration with two (or three) identical weights The spread angle method is used to correct the unbalance on grinding wheels, for example. The two weights are adjusted during the calibration from the positions 240°... - Page 34 Vibration testing and balancing device - Setup instructions EasyBalancer EB 3500 3 - 16...
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Page 35: Basic Operation
EasyBalancer EB 3500 - Controls Basic operation Controls Touchscreen Keyboard 4.1.1 Touchscreen INFORMATION EasyBalancer EB 3500 has a touchscreen for opera- tion with menu guidance. 4.1.2 Keys Symbol Function Switch the device on Switch the device off Confirm Back to the basic menu... -
Page 36: Control Elements In The Touchscreen
Basic operation - Controls EasyBalancer EB 3500 4.1.3 Control elements in the touchscreen Symbol Function Menu item back / next or select settings Start the measurement Stop the measurement Confirm Save Menu item selected / highlighted 4.1.3.1 State of charge... -
Page 37: Basic Operation
Basic operation EasyBalancer EB 3500 - Basic operation Basic operation Move Press buttons. Confirm Press the button. 4.2.1 Start screen Firmware version The start screen is displayed for a few seconds. Then the display automatically changes to the basic menu. -
Page 38: Settings
Basic operation - Basic operation EasyBalancer EB 3500 4.2.3 Settings Basic menu \ Settings: mm/s, m, mil, inch/s Units Language D, GB, F, E, USA Vibration sensor 100, 500, 1000 mV/g Pre-selection Spread angle with 2 or Method 3 weights... - Page 39 Basic operation EasyBalancer EB 3500 - Basic operation 4.2.3.3 Vibration sensor Select sensitivity as per vibration sensor. Standard value is 100 mV/g. Other values are 500 and 1000 mV/g. 4.2.3.4 Pre-selection Go to “Method” and “File name” submenus.
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Page 40: Direction Of Rotation And Counting
Basic operation - Direction of rotation and counting EasyBalancer EB 3500 Direction of rotation and counting Select the direction of rotation (1) of the rotor with the buttons. Select the direction of counting (2) with the buttons. Press the button. -
Page 41: Operator Guidance
Basic operation EasyBalancer EB 3500 - Operator guidance Operator guidance 4.5.1 Procedure for balancing in one plane Fig. 4-10: Balancing in one plane 4 - 7... -
Page 42: Maintaining The Unit
Basic operation - Maintaining the unit EasyBalancer EB 3500 Maintaining the unit Cleaning the display Only use special cleaning agents for monitors and soft cloths or spectacle cleaning cloths. Wipe the touchscreen surface down with a damp cloth. -
Page 43: Operation
Operation EasyBalancer EB 3500 - General information Operation General information 5.1.1 How do you want to measure / balance? INFORMATION All measuring / balancing tasks have in common that the following question appears after selection. Basic menu \ Measurement task (Balancing / ... -
Page 44: Overall Vibration
Operation - Overall vibration EasyBalancer EB 3500 Overall vibration INFORMATION Measurement of the overall vibration as per DIN ISO 20816. Observe safety instructions – Chapter 2. INFORMATION The overall vibration is displayed in the unit mm/s (vibration velocity). However, if the language is set to “USA”... - Page 45 Operation EasyBalancer EB 3500 - Overall vibration Carrying out the measurement Starting measurement Switch on the machine drive. Press the button (1). The measurement starts. Wait until the measured value display is stable. Stopping the measurement Press the button (2).
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Page 46: Unbalance Vibration
Operation - Unbalance vibration EasyBalancer EB 3500 Unbalance vibration INFORMATION The measurement is used to detect the speed-syn- chronous vibration, which is mainly caused by unbal- ance. Description The menu item “Unbalance vibration” allows the operator to fix the vibration sensor(s) to the optimum position for the subsequent balancing process. - Page 47 Operation EasyBalancer EB 3500 - Unbalance vibration Carrying out the measurement Starting measurement Switch on the machine drive. Press the button (1). The measurement starts. Wait until the measured value display is stable. Stopping the measurement Press the button (2).
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Page 48: Roller Bearing Measurement (Optional)
Operation - Roller bearing measurement (optional) EasyBalancer EB 3500 Roller bearing measurement (optional) INFORMATION The roller bearing measurement is used to assess the condition of the rolling bearing. Observe safety instructions – Chapter 2 Preparations Vibration sensor is connected to channel 1. -
Page 49: Balancing
Operation EasyBalancer EB 3500 - Balancing Balancing 5.5.1 Spread angle method – Sliding weight calibration (2 weights) Observe safety instructions – Chapter 2. Preparations A speed marker is attached to the rotor. The speed sensor is set up. Speed sensor and vibration sensor are con- nected to the device. - Page 50 Operation - Balancing EasyBalancer EB 3500 Zero run Position weights A and B at the specified an- gles A = 60° and B = 240°. The two weights are now in a neutral position. Confirm with Starting a zero run Switch on the machine and wait until the final ...
- Page 51 Operation EasyBalancer EB 3500 - Balancing Test run Set the sliding weight B from 240° to the angle position 300°. Weight A remains at angle position 60°. INFORMATION In this arrangement, the force vectors of weight A and weight B together generate the resulting force vector VR.
- Page 52 Operation - Balancing EasyBalancer EB 3500 Align the angle template to 0 degrees. Set weights A and B to the angle positions shown in the display according to the angle template. Control run Starting a check run Switch on the machine and wait until the final ...
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Page 53: Spread Angle Method - Sliding Weight Calibration (3 Weights)
Operation EasyBalancer EB 3500 - Balancing 5.5.2 Spread angle method – Sliding weight calibration (3 weights) Observe safety instructions – Chapter 2. Preparations A speed marker is attached to the rotor. The speed sensor is set up. Speed sensor and vibration sensor are con- nected to the device. - Page 54 Operation - Balancing EasyBalancer EB 3500 Zero run Position weights A, B and C at the specified angles A = 0°, B = 120° and C = 240°. The two weights are now in a neutral position. Confirm with ...
- Page 55 Operation EasyBalancer EB 3500 - Balancing Test run Set the sliding weight B from 120° to the angle position 60°. Weight A remains at angle position 0°, weight C remains at angle position 240°. INFORMATION In this arrangement, the force vector of weight A gen- erates the resulting force vector VR with the same magnitude.
- Page 56 Operation - Balancing EasyBalancer EB 3500 Compensation Align the angle template to 0 degrees. Set weights A, B and C to the angle positions shown in the display according to the angle template. Control run Starting a check run Switch on the machine and wait until ...
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Page 57: Creating Reports
The installation program starts and another window (1) opens. In the setup wizard: Click on the “Next” button. The software is installed on your PC. A Hofmann Reporting shortcut is created on your desktop. 6 - 1... -
Page 58: Connecting The Device To The Pc
Hofmann Reporting The operator should be familiar with the basic principles of operating a PC and with WINDOWS. Double-click on the Hofmann Reporting link (1) to start the software. Open / close the menu items by clicking on ... -
Page 59: Maintenance
Maintenance EasyBalancer EB 3500 - Battery operation Maintenance Battery operation 1 - Charger 2 - State of charge 3 - Charger connection INFORMATION When the charger is connected, the state of charge of the battery is indicated by an LED (2) and, when the device is switched on, by a battery symbol in the display (see Section 4.1.3.1 State of charge). -
Page 60: Charging Batteries
Maintenance - Mains / charging operation EasyBalancer EB 3500 7.1.1 Charging batteries Connect the charger (1). Charging time: 4-5 h Do not remove or reconnect the charger during a measurement. ATTENTION When removing the charger, always disconnect the low-voltage plug from the device first. -
Page 61: Procedure For Eliminating Faults
Maintenance EasyBalancer EB 3500 - Procedure for eliminating faults Procedure for eliminating faults Fig. 7-11: Procedure for eliminating faults 7 - 3... -
Page 62: Fault Messages
Maintenance - Fault messages EasyBalancer EB 3500 Fault messages All possible fault or system messages are sum- marised in the following table Fault message Cause Remedy Measuring sensor? Vibration sensor not connected Connect or check vibration sensor / cable. -
Page 63: Technical Data
Technical data EasyBalancer EB 3500 - EasyBalancer EB 3500 Technical data EasyBalancer EB 3500 Mains voltage power supply ..115 / 230 V / 50-60 Hz Power consumption ........approx. 5 W Battery operating time.......... > 3.5 h Battery type..........4x NiMH, AA Balancing speed range .......180 –... -
Page 64: Vibration Sensors
Technical data - Vibration sensors EasyBalancer EB 3500 Vibration sensors Acceleration sensor HMA 1140 / HMA 1135 Measuring range ........± 50 g / ± 10 g Sensitivity....100 mV/g ± 10% / 500 mV/g ± 10% Max. acceleration..........50 / 10 g Resonant frequency....... -
Page 65: Glossary
Glossary EasyBalancer EB 3500 - Signal definitions Glossary Signal definitions Fig. 9-12: Signal definitions For purely sinusoidal signals: Peak value Mean value 0.637 Peak value Effective value 0.707 Effective value Peak value 1.414 Peak value Peak-to-peak value ... -
Page 66: Conversions
Glossary - Conversions EasyBalancer EB 3500 Conversions Frequency f (Hz) 1 Hz 1 Hz 6.283 rad/s 1 Hz 0.0167 Hz Acceleration a (m/s 9.807 32.174 ft/s 1 in/s 0.0254 Velocity v (m/s) 1 m/s 1000 mm/s 1 in/s 25.4 mm/s Distance s ( ;... -
Page 67: Nomogram
Glossary EasyBalancer EB 3500 - Conversions Nomogram for determining vibration path, vibration velocity and vibration acceleration as functions of the frequency / rotary speed: Fig. 9-13: Nomogram 9 - 3... -
Page 68: Calculating Unbalance And Centrifugal Force
Glossary - Calculating unbalance and centrifugal force EasyBalancer EB 3500 Calculating unbalance and centrifugal force Examples: Unbalance: U Mass of the rotor: 1000 Eccentricity of centre of grav- 0.002 ity: U = M e = 1000 g 0,002 mm = 2 gmm... - Page 69 Glossary EasyBalancer EB 3500 - Calculating unbalance and centrifugal force Company, location Machine, plant Rotor Date, time Name 9 - 5...
- Page 70 Glossary - Calculating unbalance and centrifugal force EasyBalancer EB 3500 9 - 6...
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Page 71: Evaluation
Evaluation EasyBalancer EB 3500 - Performing vibration measurements Evaluation 10.1 Performing vibration measurements Select measurement locations close to the bearing points. Vibration sensors may be mounted in any direction on the bear- ing or machine housing. Do not place sensors on elastic parts (e.g. - Page 72 Evaluation - Performing vibration measurements EasyBalancer EB 3500 In the case of vertical shaft arrangement, arrange the sensors in the direction of greatest elasticity, as the greatest vibration is to be expected here. Fig. 10-16: Measuring locations and directions for vertical shaft arrangement as per [7] It is advisable to also measure axial vibrations.
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Page 73: Overall Value Measurement
Evaluation EasyBalancer EB 3500 - Overall value measurement 10.2 Overall value measurement Area of use Overall value measurement is suitable for checking and monitor- ing the vibration conditions of a machine. The currently valid standards for evaluating machine vibrations are DIN ISO 20816 (bearing vibrations) and DIN ISO 7919 (shaft vibrations). -
Page 74: Ranges Of Typical Values For Zone Boundaries A/B, B/C And C/D
Evaluation - Overall value measurement EasyBalancer EB 3500 Evaluation of vibration ampli- Evaluation of machine vibrations tudes as per ISO 20816 The basis of the following is the standard ISO 20816-1:2016 / Mechanical vibration – Measurement and evaluation of ma- chine vibration –... - Page 75 Evaluation EasyBalancer EB 3500 - Overall value measurement Evaluation of vibration amplitudes as per ISO 20816 Explanation of zones Zone A The vibrations of newly commissioned machines are usually in this zone. NOTE: The effort required to achieve vibrations in Zone A may be disproportionate and unnecessary.
- Page 76 Evaluation - Overall value measurement EasyBalancer EB 3500 Assessment of The assessment and limit values for machine vibrations contained vibration measurements in DIN ISO 20816 are operating guideline values which relate to the dynamic continuous load capacity of the complete machine design.
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Page 77: Assessment Of Roller Bearing Condition
Evaluation EasyBalancer EB 3500 - Assessment of roller bearing condition 10.3 Assessment of roller bearing condition Experience shows that the development of roller bearing damage on machines running in continuous operation takes several months. A measuring cycle of two weeks is therefore recommended for the timely detection of such damage development with the aid of trend monitoring. -
Page 78: For Determining The Gsp Value
Evaluation - Assessment of roller bearing condition EasyBalancer EB 3500 Particularly when measuring the gSP value, care must be taken to ensure that the measurement is always taken under the same conditions (measurement setup, sensor mounting, measurement location and direction). If possible, measurements should be tak- en in the radial plane of the bearing, Fig. -
Page 79: Interpretation Of Vibration Measurements
Evaluation EasyBalancer EB 3500 - Interpretation of vibration measurements 10.4 Interpretation of vibration measurements Possible cause Comment Appearance Confirmation of cause Vibrations with the machine speed 1x f Unbalance High radial and low axial vibra- Balancing tions with rotors located be- tween bearings. - Page 80 Evaluation - Interpretation of vibration measurements EasyBalancer EB 3500 Possible cause Comment Appearance Confirmation of cause Tooth defects High radial and low Check gear stages. axial vibration Often also 2x f and 3x f compo- nents Vibrations with double mains frequency...
- Page 81 Evaluation EasyBalancer EB 3500 - Interpretation of vibration measurements Confirmation of Possible cause Comment Appearance cause Vibrations without direct reference to the machine frequency Background vibrations Vibration source also outside Switch off machine the machine and measure remaining vibration. Natural frequencies N...
- Page 82 Evaluation - Interpretation of vibration measurements EasyBalancer EB 3500 Confirmation of Possible cause Comment Appearance cause Vibrations with high frequencies Defective roller bearing Rise in vibrations to range of Check condition of roller 10 to 60 kHz bearing. Cavitation Broad elevation of random Change flow parameters.
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Page 83: Predictive Machine Maintenance And Servicing
Evaluation EasyBalancer EB 3500 - Predictive machine maintenance and servicing 10.5 Predictive machine maintenance and servicing Simple regular vibration measurements provide the foundation. These measurements allow early detection of problems long be- fore a machine needs to be shut down for repair. -
Page 84: Further Literature
Evaluation - Further literature EasyBalancer EB 3500 10.6 Further literature [1] Lingener, A.: Balancing: Theory and Practice,Verlag Technik GmbH Berlin, Munich. 1992. [2] J. Kolerus: Zustandsüberwachung von Maschinen [Condition monitoring of machines]. Expert-Verlag, 1995. [3] Gasch, R.; Nordmann, R.; Pfützner, H.: Rotordynamik [Rotor dynamics], 2nd edition, Springer-Verlag Berlin, Heidelberg, New York, 2002. -
Page 85: Replacement Parts
Replacement parts EasyBalancer EB 3500 Replacement parts Replacement Description part no. EasyBalancer EB 3500 348-0051 Vibration sensor HMA 1140, black 790-0143 Vibration sensor HMA 1135 (optional) 790-0094 Magnetic base, flat, round 100-1454 Prismatic magnetic base for vibration sensor 360-0013 Photo-reflexive probe (speed) - Page 86 Replacement parts EasyBalancer EB 3500 11 - 2...
- Page 87 EasyBalancer EB 3500 connections, bottom ........
- Page 88 Register of illustrations EasyBalancer EB 3500...
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