Atlas Copco BLM 3750 User manual

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

BLM 3750 User Guide Revision history
9836 3078 01 Edition 2.0 3 (78)
Revision history
Revision
Date
Author
Description
Bench
software
version
2007-01 14-02-2007 M. Grippa New Edition
2007-02 05-09-2007 M. Grippa Test Setup section updated
2008-01 12-02-2008 M. Grippa Introduction review
2009-01 17-09-2009 M. Grippa Tool calibration function from Torque
Supervisor added (par. 4.1), Hardware
protection key feature added (par. 2.4)
4.0
2.0 11 June 2013 M. Grippa New manual edition fully revised. 4.3
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.
Contents
Contents.........................................................................................................................3
SAFETY INSTRUCTIONS.................................................................................................5
BATTERIES INFORMATION according to European regulation 2006/66/CE....................6
1Introduction...........................................................................................................7
1.1 About This Document...............................................................................................7
1.2 Reference Documents..............................................................................................8

Content BLM 3750 User Guide
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1.3 Specifications ...........................................................................................................9
1.4 Standard Conformity...............................................................................................10
2BLM 3750 Overview.............................................................................................11
3User Interfaces....................................................................................................16
3.1 Static transducers...................................................................................................16
3.1.1 Mechanical joint simulators..................................................................................... 18
3.2 LCD Monitor with Touch Screen.............................................................................18
3.3 Keyboard................................................................................................................19
3.4 Test Result LEDs....................................................................................................20
3.5 External Transducers Connectors...........................................................................20
3.6 USB Ports...............................................................................................................21
3.7 Ethernet Port ..........................................................................................................22
3.8 Serial Port RS232...................................................................................................22
3.9 PC Reset Switch.....................................................................................................23
3.10 Main Panel .............................................................................................................23
3.10.1 Power supply / batteries ......................................................................................... 24
3.11 Hardware Protection Key: System Backup .............................................................25
4Executing a Free Test.........................................................................................28
4.1 Testing Wrenches...................................................................................................32
4.1.1 Wrench test setup................................................................................................... 32
4.2 Testing Impulse Tools.............................................................................................35
4.2.1 Impulse tools test setup.......................................................................................... 38
4.3 Testing Power Tools...............................................................................................39
4.3.1 Power tools test setup ............................................................................................ 40
4.4 Force Versus Torque Test......................................................................................41
5External Transducers Setup...............................................................................43
6Curves Viewer .....................................................................................................46
7Test report ...........................................................................................................49
8Working with Torque Supervisor.......................................................................51
8.1 Tool Calibration Function........................................................................................57
8.1.1 Power Focus calibration ......................................................................................... 61
9Scheduled Maintenance .....................................................................................63
10 Transducers Test Procedure..............................................................................64
11 APPENDIX A: Tool Testing Guidelines..............................................................65
11.1 Statistic Control Test...............................................................................................66
11.2 Cm-Cmk Test .........................................................................................................69
12 APPENDIX B: Processes and Statistics............................................................70
13 Abbreviations ......................................................................................................74
14 Index.....................................................................................................................75

BLM 3750 User Guide Safety Instructions
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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.

Battery information BLM 3750 User Guide
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BATTERIES INFORMATION according to European regulation
2006/66/CE
MAIN BATTERIES SPECIFICATION
TYPE: Two 12V 72 Ah gel/absorbed electrolyte type lead acid storage batteries
WEIGHT: 31.2 Kg each
PC BATTERY SPECIFICATION (for all models)
TYPE: 3V lithium battery
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

BLM 3750 User Guide Introduction
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1 Introduction
1.1 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.
Chapter 2 Bench Overview This part introduces the BLM 3750 models and
operating principles.
Chapter 3 User Interfaces This chapter provides an overview of the user
interfaces available on the BLM 3750 (Transducers,
Monitor, LEDs, keyboard, ports, switches).
Chapter 4 Executing a Free Test
This part explains how to conduct a free test on
wrenches, pulse tools, power tools, and torque/force
test.
Chapter 5 External Transducers Setup This part explains how to use an external transducer
(for example IRTT-B) connected to the bench.
Chapter 6 Curves Viewer This part explains how to view and save the
torque/time curves.
Chapter 7 Test Report This part explains how to generate and save test
reports.
Chapter 8 Working with Torque
Supervisor This part explains the use of the software when the bench is working in conjunction with Torque
Supervisor

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Chapter 9 Maintenance These parts list the maintenance tasks required by the
bench.
Chapter 10 Transducer test procedure This part explains a procedure to ensure that the
transducers are working properly
Chapter 11 Tool Testing Guidelines This part explains the principles of Statistic Control
and Cm-Cmk tests.
Chapter 12 Process and Statistics This part introduces a summary of the theory of
process and statistics.
Chapter 13
and 14 Abbreviations and Index List of abbreviations used in this manual and alphabetical index
1.2 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
•Bench WEEE manual: Instructions about how to dispose of the product at the end of its life
•Torque Supervisor User Guide
•Torque Supervisor Client User Guide
•SRTT-B User Guide

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1.3 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.
•Ability to regulate and calibrate torque wrenches on the same test bench.
•First peak detection function..
TECHNICAL
•Torque range: 0.2 Nm ÷ 3000 Nm maximum (the real range depends from the bench transducers
configuration)
•Torque measurement accuracy: 0.5 % readout ±1 digit (from 20% to 100% of cell capacity)
1 % readout ±1 digit (from 10% to 20% of cell capacity)
•Temperature stability: 0.1% of capacity/°C
•Battery power supply (2 batteries 12 V 72 A/h): 16 hours’ endurance in operation mode
•Recharging at 100 ÷ 230 VAC 50 ÷ 60 Hz; if the bench is switched off, recharging takes maximum 6
hours. (not for JSB 3890)
•AC Power Consumption: 1320 W maximum
•AC Fuses: One fuse 10A 500 VAC type gG, one fuse T8AL 250V (in AC power socket)
•Overvoltage category: II
•Battery Fuses: 2 fuses 25A 500 VAC type gG
•Industrial PC.
•Indication “Low battery”
•Dimensions / Weight: 1.55m (h) x 1.15m (w) x 0.53m (d) for standard version, max 250 Kg
INTERFACES
•Touch screen LCD monitor
•USB 2.0 ports
•Network port 10/100 Base-T RJ-45
•Serial port RS232
•External transducer connectors for strain gauge torque/angle transducers; +5V supply for transducer
and encoder.

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ENVIRONMENTAL
The following conditions must be observed during operation:
•Internal Use only
•Environmental Class: II
•Ambient Temperature: 5 to 40°C
•Atmospheric humidity: 95%, non-condensing
•Altitude: Up to 2000m
1.4 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
•2004/108/EC Electromagnetic Compatibility
•2011/65/EU The restriction of the use of certain hazardous substances in
electrical and electronic equipment
Applicable normalized standards:
•EN 55011:2009+A1:2010 Industrial, scientific and medical equipment. Radio-frequency
disturbance characteristics. Limits and methods of measurement.
•EN 61000-3-3:2008 Limitation of voltage changes, voltage fluctuations and flicker in public
low-voltage supply systems, for equipment with rated current <= 16 A
per phase and not subject to conditional connection.
•EN 61000-3-2:2006 Limits for harmonic current emissions (equipment input current <= 16
A per phase).
•EN 61326-1:2006 Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 1: General requirements
•EN 61010-1:2010 Safety requirements for electrical equipment for measurement, control,
and laboratory use - Part 1: General requirements.
The BLM 3750 are provided with an Atlas Copco BLM calibration certificate.
Optional ACCREDIA (ex SIT) certification. Atlas Copco BLM is an ACCREDIA calibration centre.

BLM 3750 User Guide System overview
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2 BLM 3750 Overview
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.
The measurements taken are shown on a widescreen color LCD and the results are summarized by three
control lamps.
Since it is powered by batteries, the test bench may be used at any point along the assembly line.
Special PC software (Torque Supervisor) is available to allow the BLM 3750 to be programmed with the
tests to be carried out during the week, and to receive their results. This software has been specifically
developed for controlling a large store of tools and allows Cm and Cmk or the test results to be filed in
Statistic Control, combining them with other information concerning the life of the tool (model, class, date
of purchase, presence in line or store, repairs, tests, etc.). The tests carried out are therefore fully traceable,
including the X/R cards and the "history" of the tool, an indispensable requirement for compliance with
LCD monitor with touch screen
ISO Rig
Transducers
Drawers with
accessories
Test result lamps
Bench interfaces
Main panel

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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.
Reaction bar. The reaction bar is a useful tool to provide the operator with
greater comfort and safety during testing; when the reaction bar is in use,
the tool under test reacts on the bar instead of reacting on the operator’s
arm.
It must be always used for testing tools over 15 Nm.
European and US AC power cables.
PC CDs: Windows CD and driver. Keep it in a safe place; it might be
used by Atlas Copco service personnel during bench maintenance.

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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.
It also contains the following tools:
Special tool to open the side panel in case of need to reset the PC.
Keys for the bench drawers.

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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
documents and manuals:
Software and
documentation
Main software, started
automatically

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The software running on the BLM 3750 are:
Main software The main software is started automatically and executes tool
testing. See the chapter Executing a Free Test for details.
Torque Supervisor (Full or Client)
Torque Supervisor is optional software to store the archive of the
tools to be tested, scheduling the tests, producing report and
statistics.
See the chapter Working with Torque Supervisor for details.
L_b_oil This application, started automatically, monitors the battery
charge inside the bench, and provides warnings if necessary.
QAT Bench Backup
This application, started automatically, executes system backup.
See the chapter Hardware Protection Key: System Backup for
details.
Atlas Copco Remote Service This application can be used by the Atlas Copco service personnel
for maintenance activities.

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3 User Interfaces
3.1 Static transducers
The standard BLM 3750 bench features a set of static transducer SRTT-B:
Static transducers are designed to test:
•Impulse power tools. When the impulse tool has a shut-off valve, a mechanical joint simulator is
required.
•Wrenches
•Power tool, for those special cases in which the test on the hydraulic would be not possible. In
this case, to permit the tool to rotate, a mechanical joint simulator must be mounted on the static
transducer.
To install a mechanical joint simulator, insert the simulator in the SRTT-B, and tighten the lever before
starting the test:
Transducers

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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. However, the static cells are
threaded and require the specific mechanical joint simulator (when a joint simulator is needed).
Tighten the lever, before
starting the test.

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3.1.1 Mechanical joint simulators
For each transducer SRTT-B on the bench, the two related mechanical joint simulators are provided.
Following are the two joint simulators provided for the SRTT-B 250 Nm:
TJ SRTT-B S – 250 TJ SRTT-B H – 250
Grey-Yellow Grey-Black
Soft joint simulation Hard joint simulation
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.
3.2 LCD Monitor with Touch Screen
The BLM 3750 is equipped with a LCD monitor with touch screen.

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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:
Press on the label (in this example Nom. Torque (Nm)) and the following virtual keyboard is shown:
Enter the desired value and press Enter to save.
When a virtual switch is displayed, simply touch or click on it to change its
status.
3.3 Keyboard
Together with the touch screen, the keyboard can be used as well to input data and to manage the bench
software. The keyboard includes also an embedded mouse.
Increase/decrease by one
(active either for mouse or touch
screen)
Close virtual keyboard
Delete the last digit entered
Keyboard
Clear the display

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3.4 Test Result LEDs
The monitor houses three lamps:
GREEN (OK) Test completed with OK result
RED (NOK) Test completed with Not OK result
BLUE (READY) Bench ready for the test
3.5 External Transducers Connectors
External transducers (Torque, Torque/Angle (encoder), Force) can be connected to the bench to execute a
test. The number of external transducer connector varies according to the bench version.
Pin
Description
Pin
Description
Pin
Description
LEDs