Operation Manual for Torque Sensors
Contents
1. Operation Manual for Torque Sensors For below and similar Types D 2431 DV 14 ae B f me K EA DFW 25 DFW 35 D 2223 D 2268 E Mail info lorenz sensors com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 1 of 11 LORENZ MESSTECHNIK GmbH PERE Riese J Imprint Manufacturer Place Lorenz Messtechnik GmbH D 73553 Alfdorf p m References in this Text 1 6 Warning Notes Page 4 Attention must be paid to the accident prevention regulations of the trade associations During operation the safety precautions must be serviceable 4 Mechanical Assembly Page 6 Caution During the assembly inadmissibly large forces may not act on the sensor or the CE couplings At small torques 20 N m connect the sensor electrically during the assembly and observe the signal the measurement signal may not exceed the limit values During the assembly the sensor must be supported to protect it from falling down CE Caution at permutation of drive side and measuring side 4 1 Sensors up to 15 N m Page 6 T Sensors with nominal torques up to 15 N m are very sensitive regarding overload therefore treat the sensors with great caution 6 1 Engaging Page 8 The warming up period of the torque sensor is approx 5 min 6 4 2 Natural Resonance Page 9 Operation of the device in natural resonance can lead to permanent damages E Mail info lorenz sensors com Technical changes rese2. 3 Product Description The sensor measures static and dynamic torques The mounting position of the torque sensor is horizontally or vertically Caution it is to be differentiated between measuring side and drive side see data sheet of the sensor http www lorenz sensors com Torsion Body 3 4 Mechanical Setup The sensors do not contain rotary parts They consist of a torsion body with different connection possibilities flanges shafts square hexagonal etc The K torsion body applied with strain gauges is protected by a housing A plug or a cable connection is fixed at the housing Flange SG Supply external switch Control 3 2 Electrical Setup The strain gauge full bridge is directly connected at the plug or at the cable Optionally a calibration control can be integrated For this the SG full bridge gets detuned by an external switch in such a way that at the output the measuring signal which is corresponding to the positive nominal torque can be measured Sensor External Basic sketch of the strain gauge full bridge with option calibration control E Mail info lorenz sensors com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 5 of 11 D LORENZ MESSTECHNIK GmbH 5555 Fesoria oxo 4 Mechanical Assembly Ss Caution During the assembly inadmissibly large forces may not act on the sensor or the couplings At small torques 20 N m connect t
3. A Tu 11 11 3 RECADO aa EE E E EAE 11 12 FAN EA RR A E E A A A A A T E 11 13 ENOT U ee E E E 11 E Mail info lorenz sensors com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 3 of 11 D LORENZ MESSTECHNIK GmbH Cs fissis 1 Read First 1 1 Safety and Caution Symbols Caution Injury Risk for Persons Damage of the Device is possible CE 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 techn
4. screws consistently The flange may not slip while torque is applied surface pressure if necessary use fitting bolts 4 3 Shaft Connection The shafts must be cleaned with dissolver e g acetone before the assembly no foreign particles may adhere to them The hub must fit corresponding to the connection 4 4 Inside Square and Outside Square The inside and outside square must be cleaned before the assembly No foreign particles may adhere to them E Mail info lorenz sensors com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 6 of 11 D LORENZ MESSTECHNIK GmbH Sz sic Boe Ss 5 Electrical Connection 5 1 Pin Connection 1 SG excitation 2 SG excitation SG signal SG signal 100 calibration control 1 SG excitation 100 calibration control a ee 5 2 Free Cable Ends We Function View socket on soldering side we Signal 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 the shield forms a Faraday Cage By this electro magnetic disturbances do not have any influence on the measurement signal At potential difference problems we recommend to ground the sensor E Mail info lorenz sensor
5. Procedure Dubbel Taschenbuch f r den Maschinenbau Springer Verlag Ca Operation of the device in natural resonance can lead to permanent damages 6 5 Disturbance Variables By disturbances measured value falsifications can occur by e Vibrations Temperature gradients in the torque sensor Temperature changes Electrical disturbances Magnetic disturbances e EMC electromagnetic disturbances Therefore avoid these disturbance variables by decoupling of vibrations covers etc 6 6 Calibration Control Option By a control resistance a signal is generated in the sensor which corresponds to the nominal value of the sensor Supply external switch Control Advantage Re Calibrations are reduced Before each measurement the zero point and the nominal value can be checked Signal Function S l Supply By applying positive SG supply the measuring PPY bridge is electrically detuned so that at the output a Sensor External measuring signal of 100 of the nominal value is available Optionally 50 80 possible Use calibration control at unloaded torque sensor only E Mail info lorenz sensors com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 9 of 11 LORENZ MESSTECHNIK GmbH PERE Br 7 Maintenance 7 1 Maintenance Schedule Control of cables and connectors o es Calibration lt 26 months o 42 o Control of fixation flanges shafts ae 7 2
6. Trouble Shooting This chart is used for searching for the most frequent errors and their elimination Possible Cause Trouble Shooting No signal No sensor excitation e Outside of permissible range e Connect excitation e Cable defect e e No mains supply Signal output connected wrong Connect output correctly e Evaluation electronics defect Sensor does not react to Shaft not clamped e Clamp correctly torque No power supply Outside of permissible range Connect supply Cable defect No mains supply Signal has dropouts Zero point outside of tolerance Strong lateral forces Wrong torque indication Calibration not correct e Re calibrate Sensor defect e Repair by manufacturer Torque shunt e Eliminate shunt 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 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 b
7. e protected from moisture Only use suitable means of transportation E Mail info lorenz sensors com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 10 of 11 D LORENZ MESSTECHNIK GmbH ssi Riese J 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 been 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 S
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9. he sensor electrically during the assembly and observe the signal the measurement signal may not exceed the limit values During the assembly the sensor must be supported to protect it from falling down It is to be differentiated between measuring side and drive side of the sensor The housing is fixed at the drive side of the sensor E Caution at permutation of drive side and measuring side e The cable connection can influence the torque measurement e At dynamic measurements the measured value can be influenced by the inert masses of the housing Measuring side see corresponding data sheet 4 1 Sensors up to 15 N m E Sensors with nominal torques up to 15 N m are very sensitive regarding overload therefore treat the sensors with great caution 1 Connect the sensor electrically during the assembly and watch the signal the measuring signal may not exceed the limit values 2 Align the arrangement before the parts are firmly connected 3 Mount the sensor at the low torque resistance side first then at the stationary side This avoids impermissibly large torques from acting on the sensor 4 Counter hold by hand so that impermissibly large torques or disturbance variables can not act on the torque sensor 4 2 Flange Connection Before the assembly flanges must be cleaned with dissolver e g acetone no foreign particles may adhere to them The surface of the flange must indicate a evenness of at least 0 02 mm Tighten
10. horter 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 090138c doc Internet www lorenz sensors com Page 11 of 11
11. ique must be pointed 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 1 6 Warning Notes Attention must be paid to the accident prevention regulations of the trade associations During operation the safety precautions must be serviceable E Mail info lorenz sensors com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 4 of 11 D LORENZ MESSTECHNIK GmbH 53r ssa 2 Term Definitions 2 1 Terms Measuring Side Shaft connection in which the torque to be measured is applied Usually this side has the smallest moment of inertia Drive Side The shaft end on the opposite side of the measuring side with the larger 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 2 2 Definition of the Pictograms on the Torque Sensor The measuring side of the torque sensor is designated as follows Measuring side M or M Or More information can be found on the data sheet if needed
12. que sensor is approx 5 min Afterwards the measurement can be started Ss The warming up period of the torque sensor is approx 5 min 6 2 Direction of Torque Torque means clockwise or clockwise 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 must be limited to 70 96 of the nominal torque E Mail info lorenz sensors com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 8 of 11 D LORENZ MESSTECHNIK GmbH 92 sic Bon Ses 6 4 2 Natural Resonances Estimate of the mechanical natural frequencies C fo Natural frequency in Hz f J J2 Moment of inertia in kg m J i C Torsional rigidity in Nm rad J 5 Further methods for the calculation of natural resonances are corresponding purchasable programs or books e g Holzer
13. rved 090138c doc Internet www lorenz sensors com Page 2 of 11 D LORENZ MESSTECHNIK GmbH sss Riese Contents jM i e M 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 2 i o NC 4 To 82 U crc M 4 1 3 1 INEGIECINIG OF ale ty IN OL CS arune o oo 0T 4 toz FREMMANAING HD ANG CN T m 4 L4 FRECOMSIOCTIONS and Modifications uaiekus c essmekU cca cusbvkac cia Ric arcun I an edibe ea Cessna Un Eos us 4 o SONIA ROTE tee 4 EO MN ua eL ec ERUNT 4 MEME I EP i gue A E oo mmm 5 A EEE u tme 5 2 2 Definition of the Pictograms on the Torque Sensor c ccccccccceeeeeeeeeeeeeeseeeeeeeeeeeeeesaeeeeessaaeseeess 5 SEE Lrele bre M Bi redelilo GET Tom 5 al Mechanical iio 5 ma EEOC E Emm 5 A Mechanical AS S CML sses E E O Ea TE EEE a E ARS 6 cM E O U O si LEEREN mE 6 we FAGE CONDECION TENETUR 6 AS SMO ONECO NERIS TU TN 6 4 4 Inside Square and Outside SQuare cccccccsssssscccecccceeeeseeeeeeeceeeeeeeeeeeeeesseeeseeeeeeeessseaeeeeeeeessaaeaess 6 SEM OCCA ST Neon NEEDLE 7 SEE EG i es MERE 7 De FRECCE TN NTC 7 CN 7 54 Shielding COMMOTION MR mm 7 59 PKO DE ERNEUT 8 5 6 Running of Measuring Cables ccccccsscsccccccssssccecc
14. s com Technical changes reserved 090138c doc Internet www lorenz sensors com Page 7 of 11 LORENZ MESSTECHNIK GmbH siis Riesen 5 5 Extension Cable Caution depending on bridge resistance and wire cross section the measuring cable length enters into the characteristic value of the sensor Therefore order the sensor together with the extension cable and the calibration at Lorenz Messtechnik GmbH Dependence of the characteristic value on the cable length Wire cross Cable resistance Deviation per m Deviation per m Deviation per m section per m cable length at cable length at cable length at bridge resistance bridge resistance bridge resistance 350 Q 700 Q 1000 Q 0 14 mm 0 0896 0 0496 0 028 0 25 mm 0 046 0 023 0 016 0 34 mm 0 034 0 017 0 012 Cable resistance 2 x resistance of the cable length both feed lines of the sensor The sensors with the ordered cable length are calibrated at Lorenz Messtechnik GmbH Therefore the cable length does not need to be considered in this case 5 6 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 6 Measuring 6 1 Engaging The warming up period of the tor
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