Operation Manual for Torque Sensors
Contents
1. B 07172 93730 0 Fax 07172 93730 22 Obere SchloBstr 131 73553 Alfdorf LORENZ MESSTECHNIK Gmb I Rotating Transformer ha SN Supply Oscillator Voltage O ak 4 MHz NN LY Suply and SN Cycle and Contra Signal Control Signal i Calibration l Control Signal Control 9 aii ddl Amplifier l i Signal Signal Adaption Signal Output O Analog or Digital Conditioning peace i 1 A D Converter i 11 bit i 15 bit Rotation l Signal Angle Output Conditioning Option B Drive shaft Rotation Angle Option Rotor Stator Block diagram for serial signal transmission 4 Mechanical Assembly Before the assembly connection elements must be cleaned with dissolver e g acetone no foreign particles may adhere to them Caution During the assembly inadmissibly large forces may not act on the sensor During the assembly the sensor must be supported to protect if from falling down S pulley Cable connection Stator OPAN 1 Hy ath Fixing screw Mess Mons E Qoa ZUM RA Yooo 16 ERE 6 D Assembly Sequence Mount belt pulley on torque sensor and secure it with screws e g use adhesive for the screw locking Shift torque sensor onto drive shaft Secure torque sensor axially with lock screw E g secure screw with lock screw ad2. LORENZ MESSTECHNIK GmbH 9 55 Ea Operation Manual for Torque Sensors For Type MR 12 and similar E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www lorenz sensors com Page 1 of 11 D LORENZ MESSTECHNIK GmbH sss Riese Imprint Manufacturer Place Lorenz Messtechnik GmbH D 73553 Alfdorf Torque sensor type MR 12 O 2006 Lorenz Messtechnik GmbH Alfdorf Reprint Interdiction Reprints even in extracts only with written authority Modification Technical changes reserved References in this Text 1 6 Warning Notes Page 5 Attention must be paid to the accident prevention regulations of the trade associations Coverings and casings are necessary before operating the sensor This is also valid for commissioning maintenance and trouble shooting Duties of the coverings and casings are Protection from detaching parts Protection from contusion and shear Prevention from reaching rotating parts Prevention from being tangled up and or getting caught by parts Coverings may Not grind gt Notrotate Coverings are also necessary outside of operating and motion travel areas of persons These demands can be modified if other sufficient safety devices are available During operation the safety precautions must be operative By vibrations damages can occur at the device 4 Mechanical Assembly Page 7 Before the assembly connection elements must be cleane
3. Unbalance e Balance the corresponding parts E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www lorenz sensors com Page 10 of 11 D LORENZ MESSTECHNIK GmbH siis Riesen 8 Decommission All sensors must be dismantled professionally Do not strike sensor housings with tools Do not apply bending moments on the sensor e g through levers The torque sensor must be supported to avoid falling down during the dismantling 9 Transportation and Storage The transportation of the sensors must occur in suitable packing For smaller sensors stable cartons which are well padded are sufficient e g air cushion film epoxy crisps paper shavings The sensor should be tidily packed into film so that no packing material can reach into the sensor ball bearings Larger sensors should be packed in cases 9 1 Transportation Only release well packed sensors for transportation The sensor should not be able to move back and forth in the packing The sensors must be protected from moisture Only use suitable means of transportation 9 2 Storage The storage of the sensors must occur in dry dust free rooms only Slightly lubricate shafts and flanges with oil before storing rust 10 Disposal The torque sensors must be disposed according to the valid provisions of law For this see our General Terms and Conditions www lorenz sensors com 11 Calibration At the time of delivery torque sensors have b
4. doc Internet www lorenz sensors com Page 3 of 11 D LORENZ MESSTECHNIK GmbH Cs Flame 1 Read First 1 1 Safety and Caution Symbols Caution Injury Risk for Persons Damage of the Device is possible CS Note Important points to be considered 1 2 Intended Use Torque sensors are intended for the measurement of torques This measurand is further suitable for control tasks The valid safety regulations should be absolutely respected The torque sensors are not safety components in the sense of the intended use The sensors need to be transported and stored appropriately The assembly commissioning and disassembling must take place professionally 1 3 Dangers The torque sensor is fail safe and corresponds to the state of technology 1 3 1 Neglecting of Safety Notes At inappropriate use remaining dangers can emerge e g by untrained personnel The operation manual must be read and understood by each person entrusted with the assembly maintenance repair operation and disassembly of the torque sensor 1 3 2 Remaining Dangers The plant designer the supplier as well as the operator must plan realize and take responsibility for safety related interests for the sensor Remaining dangers must be minimized Remaining dangers of the torque measurement technique must be pointed out Human mistakes must be considered The construction of the plant must be suitable for the avoidance of dangers A danger analysis for the plant
5. lorenz sensors com Page 9 of 11 D LORENZ MESSTECHNIK GmbH PERE Riese 6 6 Disturbance Variables By disturbances measured value falsifications can occur by e Vibrations Temperature gradients Temperature changes Arising disturbance variables during operation e g imbalance Electrical disturbances Magnetic disturbances e EMC electromagnetic disturbances Therefore avoid these disturbance variables by decoupling of vibrations covers etc 7 Maintenance 7 1 Maintenance Schedule Control of cables and connectors fixpa 0 0 0 S Calibration 26monhs Control of fixation flanges shafts d xpa jJ 0 Have bearings exchanged by Lorenz 20000 hrs Messtechnik GmbH operating time 7 2 Trouble Shooting This chart is used for searching for the most frequent errors and their elimination Problem Possible Cause Trouble Shooting No signal No sensor excitation Outside of permissible range Connect excitation Cable defect No mains supply e Evaluation electronics defect Sensor does not react to torque No power supply Outside of permissible range Connect supply Cable defect No mains supply Cable defect e Repair cable Connector connected wrong e Connect correctly outside of tolerance Zero point outside of tolerance e e otrong lateral forces Heduce lateral forces Distorted flanges Check evenness of flange surfaces Wrong torque indication Oscillations e Align correctly
6. S et aa d iba pocta odia EAE eis abditus qt 8 s Ande CONN e e e 9 C SAS OMG A CU Pe eo A 9 6 1 ENOAT NER ERRORS UU o A e Eo 9 62 DIRCCHOM Ol TOQUE RETE ae 9 6 3 Static Quasi Static Torques occccccccccoconnnccnnnncnnononnncnnnnnononnnnnnnnnnnononnnnnnnnnnnnnonnnnnnrnnnnnnnonnnnnnenaninnns 9 64 Dy amic TOU S mtm 9 6 4 1 e E OE cupaaneiera EE E 9 6 4 2 Natural RESONANCES ssssssssssssssssseeeesee nennen nnne nnn nnne nnns nna nnne sna neni sens ness rnnt 9 SM eo RM mmt 9 6 6 Disturbance Variables ccccccccssssccccccssseceecceessecececseusececesseeeeesseeeeeeesseeeeeeessaueceeessaeeeessessagaes 10 2080 2119 162102 g 6 gt 2 02 77 7 7777 m 10 FA Maintenance Schedule IRR R 10 E MEME cello eec RITE mo E 10 ISCO cea m RET eps 11 9 Transportation and Storage ccccccccccssssseeceeeececeeeeeeeceeeeeeeeeeeeceeeesseaeseeeeeeesssseeseeeeeeessseaseeeeseeeeeeaaas 11 9 1 TransportallOFl escenes vesoexd ile 11 SUMMER 11 10 EIS OOS ME T 11 11 672 0172 11 0 UTE Pe O 11 11 1 Proprietary Calibration cccccccccccssseseececeeeeeeeeeeeeeceeeeeesuseeseeeeeeeseeesseeeeeeessaaaesseeeeeeeessaaageeeeeeees 11 11 2 DKD Calibr ON RENE TU TU 11 11 3 PA 11 12 Bi Eel IIO NR UU MT 11 13 AA 11 E Mail info lorenz sensors com Technical changes reserved 090268
7. ating transformer K NAN Torsion shaft Support bearings 3 2 Electrical Setup The supply of the rotor electronics occurs by an alternating voltage generated in the stator which transfers to the rotor through a rotating transformer There it is rectified and stabilized With this supply the strain gauge bridge Is fed For the electrical calibration control of the sensor a control signal is up modulated to the supply by the u processor in the stator and transferred to the rotor There it is filtered and evaluated by the uPC which also activates the internal switch for the detuning of the strain gauge bridge The measuring signal of the strain gauge bridge is conditioned in an amplifier and then converted into a digital signal which will be transferred to the stator by another rotating transformer Compared to the analog signal the measuring signal in digital form is much more disturbance free The remaining distance of the measuring signal within the sensor occurs in digital form completely Thus the measuring system achieves a high reliability of operation This signal is further conditioned in the stator comes into a p processor then depending upon sensor type it is converted to a voltage signal digital signal or to current and will then reach the output of the sensor and can be directly measured at the connector E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www lorenz sensors com Page 6 of 11
8. d with dissolver e g acetone no foreign particles may adhere to them Caution During the assembly inadmissibly large forces may not act on the sensor CS During the assembly the sensor must be supported to protect if from falling down 6 1 Engaging Page 9 Warming up period of the sensor is approx 5 min 6 4 2 Natural Resonances Page 9 An operation of the device in natural resonance can lead to permanent damages E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www lorenz sensors com Page 2 of 11 D LORENZ MESSTECHNIK GmbH sss Riese Contents A 4 1 1 Safety and Caution Symbols leues eiieiseeeeee essen eene n nnam sana ak aa asas acr saa a aa asas a rs sn sias 4 12 i o NC 4 To o crc M 4 1 3 1 Nedlecimarot Salte INDIOS arune ote 4 32 emana Dan CN T eo cacon 4 1 4 Heconstr ctioris and Modifications sers a ea iaa 4 o hae a ee eee 4 EO ANAG NOOS ERUNT 5 MEME EP i gie A E oo mre 5 EA Pu A 5 pelo Bio MB 0 dolo aM mm 6 SM MEME saueues ap scoesdegataeetediseneneercees 6 o oa Pe 6 4 Mechanical ASSembD ly zussiceziesravesxisubsszavevubs Errar ria Ri AE A AD id a dede 7 SIAC HIG Al OSC OI ari een 8 sn MEME LP disi mU LEER 8 SP MEE E ere e O y A 8 lt A e rr e o E 8 S ONENG COMME CO RETRO 8 o5 Running orMeasullg Gables eei aient ese aes pnieeac dio n
9. e torque to be measured is applied Usually this side has the smallest moment of inertia Drive Side Mechanical connection of the torque sensor on the opposite side of the measuring side usually with the largest moment of inertia At static torque sensors the housing is fastened on this side Low Torque Resistance Side The shaft of the arrangement drive load which can be turned considerably smaller with torque than the nominal torque of the torque sensor M lt lt Mnenn E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www lorenz sensors com Page 5 of 11 D LORENZ MESSTECHNIK GmbH sss Rosen 3 Product Description The sensor measures static and dynamic torques The mounting position of the torque sensor is horizontally or vertically 3 4 Mechanical Setup The sensors consist of a torsion shaft The connection is carried out by a belt pulley and a shaft with feather key The torsion shaft is applied with strain gauges For the signal transmission and or the supply of the strain gauge full bridges a rotating transformer according to the principle of a transformer is arranged in the sensor For supply and measuring signal conditioning electronics are integrated in the stator and the rotor Belt pulley p SG Option S Angle Sensor NN SS Connector ZA Dat IN a Shaft with feather key LLLL ELLAN L LIN LESS IAS OIII III ZE ZRC NIL A WLLL Rot
10. een adjusted and tested with traceable calibrated measuring equipment at factory side Optionally a calibration of the sensors can be carried out 11 1 Proprietary Calibration Acquisition of measurement points and issuing of a calibration protocol Traceable calibrated measuring equipment is being used for the calibration The sensor data are being checked during this calibration 11 2 DKD Calibration The calibration of the sensor is carried out according to the guidelines of the DKD The surveillance of the calibrating laboratory takes place by the DKD At this calibration the uncertainty of measurement of the torque measuring instrument is determined Further information can be obtained from Lorenz Messtechnik GmbH 11 3 Re Calibration The recalibration of the torque sensor should be carried out after 26 months at the latest Shorter intervals are appropriate e Overload of the sensor After repair After inappropriate handling Demand of high quality standards Special traceability requirements 12 Data Sheet See www lorenz sensors com 13 Literature Dubbel Taschenbuch f r den Maschinenbau Springer Verlag E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www lorenz sensors com Page 11 of 11
11. he shield forms a Faraday Cage By this electro magnetic disturbances do not have any influence on the measurement signal 5 5 Running of Measuring Cables Do not run measuring cables together with control or heavy current cables Always assure that a large distance is kept to engines transformers and contactors because their stray fields can lead to interferences of the measuring signals If troubles occur through the measuring cable we recommend to run the cable in a grounded steel conduit E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www lorenz sensors com Page 8 of 11 D LORENZ MESSTECHNIK GmbH sis Ena 5 6 Angle Option At angle or speed measurement the pulses revolutions are acquired By a second transmitter trace displaced by Impulse Evaluation with a second 90 and flank evaluation the pulses revolutions can be 90 shifted Impulse Track quadrupled The trace displaced by 90 can also be ae dw ER 399 i s 0 180 0 180 used for the rotational direction detection See corresponding data sheet for the output levels Supply for angle sensor lh iy 3 Stabilized supply voltage 5 V 25 mV Current consumption max 1990 shifted 6 Measuring 6 1 Engaging The warming up period of the torque sensor is approx 5 min Afterwards the measurement can be started CS The warming up period of the torque sensor is approx 5 min 6 2 Direction of Torque Torque means clockwise or cl
12. hesive Apply twist lock for stator see data sheet for mounting possibility the cable connection may not be used as a twist lock Use an elastic element or a catch 090268 doc Page 7 of 11 Technical changes reserved E Mail info lorenz sensors com Internet www lorenz sensors com D LORENZ MESSTECHNIK GmbH Cs Eliana 5 Electrical Connection 5 1 Pin Connection Also see test certificate 12 Analog No B jOptionangeB TTL Signal 5 V 10 V D j SigalGND OV E ExcitatinGND__0Y Excitation 12 28 VDC yellow G I E ya Calibration L lt 2 0 V Control H gt 3 5 V xedstilue f View socket on soldering side 5 2 Calibration Control Only use calibration control in unloaded condition of the torque sensor Applying of voltage 3 5 V up to 28 V will enable the 5 TT calibration control Ko Excitation GND Voltage below 2 8 V will disable the calibration control K Calibration control Exc GND red F blue E O SAS yellow G brown L S EN black H U kal HE i rH setti 3 5 VDC lt Uka lt 28 VDC green B SS white Q violet WETTED Cal control 5 3 Cable Only use a shielded cable with preferably small capacity We recommend measuring cables from our product range They have been tested in combination with our sensors and meet the metrological requirements 5 4 Shielding Connection In combination with the sensor and the external electronics t
13. must be carried out 1 4 Reconstructions and Modifications Each modification of the sensors without our written approval excludes liability on our part 1 5 Personnel The installation assembly commissioning operation and the disassembly must be carried out by qualified personnel only The personnel must have the knowledge and make use of the legal regulations and safety instructions E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www lorenz sensors com Page 4 of 11 D LORENZ MESSTECHNIK GmbH PERE Riese 1 6 Warning Notes Attention must be paid to the accident prevention regulations of the trade associations Coverings and casings are necessary before operating the sensor This is also valid for commissioning maintenance and trouble shooting Duties of the coverings and casings are Protection from detaching parts Protection from contusion and shear Prevention from reaching rotating parts Prevention from being tangled up and or getting caught by parts Coverings may gt Not grind gt Not rotate Coverings are also necessary outside of operating and motion travel areas of persons These demands can be modified if other sufficient safety devices are available During operation the safety precautions must be operative By vibrations damages can occur at the device 2 Term Definitions 2 1 Terms Measuring Side Mechanical connection of the torque sensor in which th
14. ockwise torque if the torque acts clockwise when facing the shaft end In this case a positive electrical signal is obtained at the output Torque sensors by Lorenz Messtechnik GmbH can measure both clockwise and counter clockwise direction 6 3 Static Quasi Static Torques otatic and or quasi static torque is a slowly changing torque The calibration of the sensors occurs statically on a calibration device The applied torque may accept any value up to the nominal torque 6 4 Dynamic Torques 6 4 4 General The static calibration procedure of torque sensors is also valid for dynamic applications Note The frequency of torques must be smaller than the natural frequency of the mechanical measurement setup The band width of alternating torque must be limited to 70 96 of the nominal torque 6 4 2 Natural Resonances Estimate of the mechanical natural frequencies c fo Natural Frequency in Hz fo Ji J2 Moment of Inertia in kg m Je C Torsional Rigidity in Nm rad J Further methods for the calculation of natural resonances are corresponding purchasable programs or books e g Holzer Procedure Dubbel Taschenbuch f r den Maschinenbau Springer Verlag L An operation of the device in natural resonance can lead to permanent damages 6 5 Speed Limits The maximum speed indicated in the data sheet may not be exceeded in any operating state E Mail info lorenz sensors com Technical changes reserved 090268 doc Internet www
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