Atlas Copco BLM 3750 User Manual
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Atlas Copco BLM 3750 User Manual

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User Guide
BLM 3750
Atlas Copco Industrial Technique AB
9836 3078 01
Edition 2.0
2013-06

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Summary of Contents for Atlas Copco BLM 3750

  • Page 1 User Guide BLM 3750 Atlas Copco Industrial Technique AB 9836 3078 01 Edition 2.0 2013-06...

  • Page 3: Table Of Contents

    Copyright Atlas Copco Industrial Technique AB NOTE: This manual may be altered without further notice. For further information log on to Atlas Copco www.atlascopco.com NOTE: In the event of conflicts between translations of this user guide, always refer to the official English version.
  • Page 4 Content BLM 3750 User Guide Specifications ......................9 Standard Conformity ....................10 BLM 3750 Overview..................... 11 User Interfaces ....................16 Static transducers ....................16 3.1.1 Mechanical joint simulators ..................18 LCD Monitor with Touch Screen ................18 Keyboard ........................ 19 Test Result LEDs ....................

  • Page 5: Safety Instructions

    WARNING: PLEASE READ THE SAFETY INSTRUCTIONS No. 9836 5531CAREFULLY PRIOR TO USING THE PRODUCT AND STRICTLY FOLLOW THE SAFETY INSTRUCTIONS PROVIDED. THE DOCUMENT IS APPLICABLE TO THE BLM 3750 EXCEPT FOR THE HYDRAULIC COMPONENTS NOT PRESENT IN THIS BENCH. 9836 3078 01 Edition 2.0...

  • Page 6: Batteries Information According To European Regulation 2006/66/Ce

    WEIGHT: 5 g WARNING All the service activities, including those related to maintenance of the batteries, must be executed only by Atlas Copco service personnel who has been properly trained. ONCE REMOVED, THE WASTED BATTERIES MUST BE DISMISSED ACCORDING LOCAL REGULATIONS 6 (78) 9836 3078 01 Edition 2.0...

  • Page 7: Introduction

    BLM 3750 User Guide Introduction Introduction About This Document This document is a user manual for the BLM 3750 and it is divided into the main following parts: Part Name Description Chapter 1 Introduction This part introduces this user manual and details bench technical specifications.

  • Page 8: Reference Documents

    The following is a list of important documents useful for a complete view of the product in all its applications: • BLM 3750 Safety Instructions (No. 9836 5531 00): Multilanguage safety instructions and declaration of conformity • BLM Torque Seminar •...

  • Page 9: Specifications

    BLM 3750 User Guide Introduction Specifications MAIN FUNCTIONS • Testing in Statistic Control, Cm and Cmk measurements and tool calibration. • Extremely simple for the user, providing immediate results with colored lamps: Green: OK, Red: NOT OK • Storage of test curves and reports with date and time.

  • Page 10: Standard Conformity

    • Atmospheric humidity: 95%, non-condensing • Altitude: Up to 2000m Standard Conformity The BLM 3750 are in conformity with the requirements of the council Directives on 06/22/1998 on the approximation of the laws of the Member States relating: • 2006/95/EC Low Voltage Directive •...

  • Page 11: Blm 3750 Overview

    Drawers with accessories The BLM 3750 is ideal for controlling torque wrenches and screwdrivers according to ISO 6789 and SPC standards or for calculating their Cm – Cmk. The user-friendly software and the touch screen allow for immediate and simple operation.
  • Page 12 BLM 3750 Overview BLM 3750 User Guide the standard ISO 9000. Contact your Atlas Copco sales for any further information regarding this software. The drawers contain a set of accessories: Set of adapters. Number and size of adapters depend from the bench transducers configuration.
  • Page 13 BLM 3750 User Guide BLM 3750 Overview An additional box is delivered with the bench: This box contains calibration safety instructions, manuals, certificates, passwords for software and other important documents. It should be removed and kept in a safe place by the bench administrator.
  • Page 14 BLM 3750 Overview BLM 3750 User Guide USB Recovery Key, containing the backup of the bench factory configuration. This key must be kept in a safe place, and must be available for service personnel during bench maintenance activities. On the bench monitor desktop there are links to the JSB software(s) and some folders containing bench...
  • Page 15 This application, started automatically, executes system backup. QAT Bench Backup See the chapter Hardware Protection Key: System Backup for details. This application can be used by the Atlas Copco service personnel Atlas Copco Remote Service for maintenance activities. 9836 3078 01 Edition 2.0...

  • Page 16: User Interfaces

    User Interfaces BLM 3750 User Guide User Interfaces Static transducers The standard BLM 3750 bench features a set of static transducer SRTT-B: Transducers Static transducers are designed to test: • Impulse power tools. When the impulse tool has a shut-off valve, a mechanical joint simulator is required.
  • Page 17 BLM 3750 User Guide User Interfaces Tighten the lever, before starting the test. NOTE: Tighten the lever before entering the test window; the zero alignment will be not performed properly otherwise. NOTE: For old benches, a static cell was installed instead of the SRTT-B: The test philosophy on the static cell is the same of the one for SRTT-B.

  • Page 18: Mechanical Joint Simulators

    For SRTT-B 1000 Nm, only one joint simulator is provided. Refer to the TJ SRTT-B User Guide for more details about the joint simulators. LCD Monitor with Touch Screen The BLM 3750 is equipped with a LCD monitor with touch screen. 18 (78) 9836 3078 01 Edition 2.0...

  • Page 19: Keyboard

    BLM 3750 User Guide User Interfaces To use all of the functions described in this manual, the touch screen can be used to manage all of the operation (the bench keyboard/mouse, or external keyboard/mouse can be used as well). To edit a value in the bench software, proceed as following:...

  • Page 20: Test Result Leds

    User Interfaces BLM 3750 User Guide Test Result LEDs LEDs The monitor houses three lamps: GREEN (OK) Test completed with OK result Test completed with Not OK result RED (NOK) BLUE (READY) Bench ready for the test External Transducers Connectors External transducers (Torque, Torque/Angle (encoder), Force) can be connected to the bench to execute a test.

  • Page 21: Usb Ports

    BLM 3750 User Guide User Interfaces V+ transducer FB encoder V+ encoder V- transducer Not connected S/T/U/V Not connected Signal + FA encoder J/K/K/L/ Signal - Not connected Shield V- encoder For details about how to configure an external transducer in the bench software, see the External Transducers Setup chapter.

  • Page 22: Ethernet Port

    User Interfaces BLM 3750 User Guide Ethernet Port The Ethernet port can be used to connect the bench to the network. A typical application is to program or download data from benches using Torque Supervisor Client. Refer to the Torque Supervisor User Guide and Torque Supervisor User Guide for details.

  • Page 23: Pc Reset Switch

    BLM 3750 User Guide User Interfaces PC Reset Switch A further switch is located inside the bench under the main panel. Activating this switch causes the PC to reset; it can be used in the event that the PC does not respond to the input commands.

  • Page 24: Power Supply / Batteries

    User Interfaces BLM 3750 User Guide Press the START switch for 5 seconds to start bench operations. The PC launches the software automatically. Press STOP to turn off the bench. The PC ON lamp is alight when the PC is powered.

  • Page 25: Hardware Protection Key: System Backup

    Battery voltage < 20V and battery charger turned off 3.11 Hardware Protection Key: System Backup The BLM 3750 bench contains a hardware protection USB key; which provides the following features: • System backup: Test bench settings and calibration data. NOTE: Personal documents are not saved in the backup! Traces saved during tests...
  • Page 26 (from the Windows Task Manager) When a backup or a restore is executed, a password is required. The default passwords are provided with the test bench. Atlas Copco strongly recommends to change these passwords: 26 (78) 9836 3078 01 Edition 2.0...
  • Page 27 BLM 3750 User Guide User Interfaces The Admin and Operator passwords allow the same functions; the only difference is that the Admin password allows also to change the two passwords. If the USB key is not present an error message is shown to indicate to connect the USB key: The hardware protection key is located on the HUB inside the bench and it must be always connected.

  • Page 28: Executing A Free Test

    Quit the program. Launches the test interface window. Free Test For the user this button opens the external transducers setup window (see par. External Transducers Setup). For Atlas Copco service personnel this allows bench settings and Setup calibration. Curves Opens the window for viewing curves. See the chapter Curves Viewer for details.
  • Page 29 Click on Free Test to start a measurement: The following window is shown: Standard Click to execute a free test. Not used for BLM 3750. Curve Simulation Click on Standard. The following window is shown: 9836 3078 01 Edition 2.0...
  • Page 30 Executing a Free Test BLM 3750 User Guide Torque value for the tool under test (select also the desired Measurement Unit). Nom. Torque Transducer of the bench on which the test is run. Transducer Number Type of the tool under test. See the next paragraphs of this chapter for more details Tool Type of the various tools types.
  • Page 31 BLM 3750 User Guide Executing a Free Test Test results Statistics area (test n. 0 is not considered) Abort test Delete last test result Display graph The results of the tests run on the tool are displayed in the Results area; the statistics are calculated in real time and updated every time a test is completed.

  • Page 32: Testing Wrenches

    BLM 3750 User Guide Testing Wrenches All type of wrenches can be test by the BLM 3750. Having the static cell mounted in a vertical position and the wrench tested always in the horizontal position, the prescriptions of the ISO regulations about wrench testing are satisfied.
  • Page 33 BLM 3750 User Guide Executing a Free Test When testing a click wrench, the cut-out may not be sufficient to warn the operator of the obtained torque and thus the joint may undergo a further increase in torque. By using a peak torque detector, only the first drop in torque is considered, and subsequent values are disregarded: Even if force continues to be applied to the wrench after the cut-out, only the peak value of the trigger is recorded.
  • Page 34 Executing a Free Test BLM 3750 User Guide The default values of “1 %” are set at 50% and of “2 %” at 90%; however, they might be changed to suit your specific wrenches. Measurement of the first peak is particularly useful for adjusting the click point of a wrench or evaluating its Cm-Cmk.

  • Page 35: Testing Impulse Tools

    This parameter is not used by the BLM 3750 Testing Impulse Tools WARNING: Impact tools cannot be tested on the BLM 3750. Pulse tools do not provide a continuous torque output but they generate single high energy pulse of very short duration (≈...
  • Page 36 Executing a Free Test BLM 3750 User Guide Therefore, the following process should be applied to an impulse tool: Set a low torque Check the residual torque Too low Slightly increase torque For the impulse tools the test window shows an additional parameter: The Att.
  • Page 37 BLM 3750 User Guide Executing a Free Test  Pulse tools without shut off does not stop pulsing until the operator releases the trigger, so they should always be tested in static conditions: Impulse tool without shut off SRTT-B static...

  • Page 38: Impulse Tools Test Setup

    Executing a Free Test BLM 3750 User Guide 4.2.1 Impulse tools test setup The test parameters for Impulse tools can be customized in the Test Setup menu: This menu can be accessed by a proper bench administrator password, provided with the test bench documents delivered with the bench.

  • Page 39: Testing Power Tools

    The mechanical joint simulator on the static cell reproduces the behavior of a joint. Refer to the official Atlas Copco price list, published and updated every year, for the list of the available mechanical joint simulators from Atlas Copco.

  • Page 40: Power Tools Test Setup

    Executing a Free Test BLM 3750 User Guide 4.3.1 Power tools test setup The test parameters for power tools (divided into 1-Step and 2-Steps tools) can be customized in the Test Setup menu: This menu can be accessed by a proper bench administrator password, provided with the test bench documents delivered with the bench.

  • Page 41: Force Versus Torque Test

    Time out, the test ends. The Time out is given in milliseconds. The default value is 200 ms. Not used for BLM 3750. Force Versus Torque Test This test is typically run on TP Transducers or torque wrench with a force washer. The torque measurement is multiplied by the Att.
  • Page 42 Executing a Free Test BLM 3750 User Guide Select the external transducers on which the force and torque transducers are connected. The external transducer must be properly before starting the test. See the External Transducers Setup chapter for details. The Ctrl. Mode (control mode) select if the statistics must be calculated on the torque or on the force;...

  • Page 43: External Transducers Setup

    External Transducers Setup External Transducers Setup Most of the tests on the BLM 3750 are performed directly on the bench transducers. However, it is possible to connect an external transducer connected to one of the external transducer connectors. This can be used, for example, in the following cases: •...
  • Page 44 External Transducers Setup BLM 3750 User Guide The number of Channels and Cells available depend from your bench configuration. For a standard JSB 3750 the 4 transducers (the first 4 cells), associated to the first 4 channels, are reserved for the bench transducers;...
  • Page 45 BLM 3750 User Guide External Transducers Setup At the time of the test, connect the IRTT-B 25 Nm to connector XDUC 6 and select Transd. No. 5 (Cell Transd. No. 5 selects Cell 5 To select the IRTT-B 75 Nm, Transd. No. 6 must be selected and IRTT-B 75 Nm will be connected to connector XDUC 8 (Channel 8).

  • Page 46: Curves Viewer

    Save Save the curve on the PC (.crv and a .k39 file are created). View Speed Not used for BLM 3750. Zoom The Zoom functions allow the operator to zoom in on the area selected with the two zoom cursors. Before activating the zoom, select the zoom function between Torque and Speed in order to zoom in properly on the curve of interest.
  • Page 47 BLM 3750 User Guide Curves Viewer Restore Reset the zoom function and display the whole curve. Filter Click to change the filter parameters: Click on Edit to change the default cut frequency. In the box at the top of this window choose between a filter of the third or fifth order.
  • Page 48 Set to On Save Set to On the Deb. switch and click on Save. The curves can be viewed and edited by the Atlas Copco software Curve; ask to your Atlas Copco sales reference for more details. 48 (78) 9836 3078 01 Edition 2.0...

  • Page 49: Test Report

    BLM 3750 User Guide Test Report Test report After a set of minimum ten tests in the free test mode, it is possible to create a test report: Results Delete the selected result Create report In the results area, before generating the report it is possible to view the results. Click on Delete Value to cancel the highlighted result in the list.
  • Page 50 Export results to file (.csv format) At the end of the report the statistic results are shown: Statistics If the BLM 3750 is equipped with a dedicated printer for report printing, the report can be printed directly on the bench. 50 (78)

  • Page 51: Working With Torque Supervisor

    Torque Supervisor software is the perfect solution for scheduling calibration and supervising your tool stock. Compatible with other Atlas Copco products, it manages the control routes for each shift at each test bench, keeps calibration expiry dates under control for each and every power tool and torque wrench, and collects quality control data (initial breakaway).
  • Page 52 Working with Torque Supervisor BLM 3750 User Guide When exchanging data with Torque Supervisor Full, the bench must be connected to the network (it can be disconnected then for test execution), and FTP Server Bench must be always running on the bench: FTP Server icon Do not disable the application.
  • Page 53 BLM 3750 User Guide Working with Torque Supervisor Control mode is set from Torque Supervisor. It is possible anyway to change its setting before clicking on Start Test: For pulse tools, the Atten. Coeff. (Attenuation Coefficient, stored inside Torque Supervisor) is displayed.
  • Page 54 Working with Torque Supervisor BLM 3750 User Guide When a statistic control test is run, the following window is shown: Test result Non-compliance message(s) Once the specified number of tests for the statistic control has been completed, the result is displayed.
  • Page 55 BLM 3750 User Guide Working with Torque Supervisor The possible test results are: IAGNOSIS URTHER ACTION USABILITY Can be The tool works properly. None used Can be The mean is higher than the nominal torque, Calibrate, reducing used but does not exceed the control limits.
  • Page 56 Working with Torque Supervisor BLM 3750 User Guide When a Cm-Cmk test is run and the double test option is enabled (typically this can be set by Torque Supervisor), the graph and the results area show the bench and tool readings at the same time: The Wirkungsgrad is calculated for every test as the ratio of Torque to Tool Torque;...

  • Page 57: Tool Calibration Function

    BLM 3750 User Guide Working with Torque Supervisor Tool Calibration Function The tool calibration is a function provided by Torque Supervisor to calibrate the tool controller. The minimum version for Torque Supervisor is 3.9r The test consists in a series of test on the tool in order to calculate the new calibration coefficient for the controller.
  • Page 58 Working with Torque Supervisor BLM 3750 User Guide After each test the following window is shown: The torque value measured by the bench is shown; the torque value read by the tool controlled must be entered manually. Enter the torque measured by the tool controller value and click on Enter to confirm.
  • Page 59 BLM 3750 User Guide Working with Torque Supervisor After entering the old coefficient, the new one is shown. The New Coefficient field shows the new value, which must be entered manually into the tool controller. This value can be even edited manually, by clicking on Edit New.
  • Page 60 Working with Torque Supervisor BLM 3750 User Guide If the new calibration value is almost the same of the previous one, the tool is considered as already calibrated. A warning message asks the user to send anyway the new coefficient or keep the actual one.

  • Page 61: Power Focus Calibration

    BLM 3750 User Guide Working with Torque Supervisor 8.1.1 Power Focus calibration The procedure described in the previous paragraph can be run in automatic mode when calibrating the Power Focus. It is possible to calibrate the only the Power Focus with Tensor ST or STB.
  • Page 62 Working with Torque Supervisor BLM 3750 User Guide Power Focus connection LED Bench readings Power Focus readings If for any reason the communication gets lost, the procedure continues automatically in the manual mode as described in the previous paragraph of this manual. The yellow LED remains active, but at the end of...

  • Page 63: Scheduled Maintenance

    BLM 3750 User Guide Scheduled Maintenance Scheduled Maintenance WARNING: Maintenance operations must be executed by Atlas Copco personnel only. CALIBRATION: The bench transducers should be recalibrated once every year. Contact your customer center for this activity. Starting from one month before the calibration expiring of a transducer, the following message informs the...

  • Page 64: Transducers Test Procedure

    BLM 3750 User Guide Transducers Test Procedure Atlas Copco strongly recommends calibrating the transducer monthly. This procedure is not intended to substitute the yearly calibration, but it is a straightforward and quick method for checking the transducers for correct operation and performing complete calibration, if needed.

  • Page 65: Appendix A: Tool Testing Guidelines

    BLM 3750 User Guide Appendix A: Tool Testing Guidelines APPENDIX A: Tool Testing Guidelines This chapter gives an overview of the tool testing guidelines. The BLM 3750 features 2 different type of test: • Statistic control test (when used with Torque Supervisor) •...

  • Page 66: Statistic Control Test

    Appendix A: Tool Testing Guidelines BLM 3750 User Guide 11.1 Statistic Control Test “Statistic control” is a statistical method for preventing errors and for controlling the productive process. The statistical calculation is based on checking the individual tests on each tool to verify that they are within the set tolerance limits, and on the sequence of periodic tests to define the tool’s repeatability and...
  • Page 67 BLM 3750 User Guide Appendix A: Tool Testing Guidelines • One average out of control limits: • Last N. averages above or below than the nominal value: • Range out of limits: 9836 3078 01 Edition 2.0 67 (78)
  • Page 68 Appendix A: Tool Testing Guidelines BLM 3750 User Guide • Last N. averages increasing or decreasing: • Last 2 averages out of warning limits: • Last 4 averages over 1/3 of the upper control limit or under 1/3 of the lower control limit 68 (78) 9836 3078 01 Edition 2.0...

  • Page 69: Cm-Cmk Test

    BLM 3750 User Guide Appendix A: Tool Testing Guidelines 11.2 Cm-Cmk Test The Cm-Cmk test is used to test the accuracy and repeatability of a power tool or a torque wrench at a specific calibration. The result is a value that summarizes the dispersion of a specific number of values measured (Cm) and the position with respect to the control limits (Cmk).

  • Page 70: Appendix B: Processes And Statistics

    Appendix B: Processes and Statistics BLM 3750 User Guide APPENDIX B: Processes and Statistics BRIEF NOTES ON HOW THE PROCESS WORKS The functioning of a process is a measure of its reliability. A certain amount of variability can be found in...
  • Page 71 BLM 3750 User Guide Appendix B – Processes and Statistics as can be seen in the diagram below: 0,003 % 99,994 % 0,003 % 0,135 % 99,73 % 0,135 % 95,44 % 68,26 % -1 σ +1 σ +2 σ...
  • Page 72 Appendix B – Processes and Statistics BLM 3750 User Guide The higher the value, the less the dispersion of the values and the better the Cp index. But the Cp value is only a measurement of dispersion; in other words, the amplitude of distribution of the values around the mean value, not their centering.
  • Page 73 BLM 3750 User Guide Appendix B – Processes and Statistics Cpk = 1,08 Cpk = 1,00 Cpk = 0,67 Cpk = 0,17 A low Cpk value means that either the process is not centered on the mean point of the specifications, or that it deviates from the specifications, or both.

  • Page 74: Abbreviations

    Abbreviations BLM 3750 User Guide Abbreviations Abbreviation Description Abbreviation Description Waste Electrical and Electronic Ampere WEEE Equipment Alternating current Ampere-hour Counter clockwise Clockwise Decibel referred to milliwatt Direct current Electromagnetic Compatibility Electromagnetic Interference Hertz (measurement unit of frequency) Light-Emitting Diode...

  • Page 75: Index

    BLM 3750 User Guide Index Index 1-Step tools; 39 Hardware protection key; 25 Abbreviations; 74 Impulse tools; 35 Accredia; 10 Accuracy; 9 Joint simulator mechanical; 18 JSB Bench Backup; 25 overview; 11 Batteries; 24 Battery information; 6 Keyboard; 19 Calibration; 57 Power Focus;...
  • Page 76 Index BLM 3750 User Guide Settings Tool calibration; 57 1-Step tools; 40 Torque range; 9 Impulse tools; 38 Torque Supervisor; 51 Wrenches; 32 Touch screen; 18 Shut off valve; 37 Transducers Specifications; 9 test procedure; 64 standard conformity; 10 SRTT-B; 16 Standard conformity;...
  • Page 78 9836 3039 01 Edition 2.0 2013-06 www.atlascopco.com...

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