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BU LLET IN E MCRT X NonContact Noise Ha rdened Wire mA Loop Powered Torque Transmitters Torq ue Ranges t o lbfin

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BU LLET IN E MCRT X NonContact Noise Ha rdened Wire mA Loop Powered Torque Transmitters Torq ue Ranges t o lbfin

Presentation on theme: "BU LLET IN E MCRT X NonContact Noise Ha rdened Wire mA Loop Powered Torque Transmitters Torq ue Ranges t o lbfin"— Presentation transcript:

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Foot Mount:( ) Yes( ) NoFactory Settings (field changeable):Filter Cutoff (Hz):( )Operating Mode:Uni-directional:( ) CCW( ) CWBi-directional:( ) CCW( ) CW ............................3 ......3 ..........................3 A.2 Coupling Selection ....................4 A.3 Coupling Installation ...................4 A.4 End-to-End Orientation .................5 A.4.1 Effect On Signal Polarity ..............5 .............5 A.5 Vertical Installations ....................5 ..........................5 B.2 Torque Signal .........................5 .............5 .....6 B.2.3 Zero and Span Adjustment ............6 B.2.4 Calibration Intervals .................7 B.3 Speed Signal .........................7 B.3.1 Code P Passive Pickup Connections ....7 ........7 B.3.3 Code Z Zero Velocity Pickup Pinout .....8 ....8 ..........................8 C.2 Allowable Torque Loads ................8 C.2.1 Overload Considerations .............8 C.2.2 Fatigue Considerations ...............9 Electric Motors .......................9 C.3 Allowable Bearing Loads ...............10 C.4 Allowable Extraneous Loads ............10 C.4.1 Bending Loads ....................10 C.4.2 Thrust Loads ......................10 C.5 Operating Speeds ....................11 .................11 ..........................11 C.7.1 Standard Products .................11 C.7.2 Oil Mist For High Speed Products .....12 ....................... 12 ..............12 ...............................12..................12 D.2.1 Torque Transmitter..................12 D.2.2 Cabling ...........................12 D.2.3 Readout Instrument .................12............12 D.3.1 No Output When Torque Is Present .....12 D.3.2 Constant Or Full Scale Output .........13 D.3.3 Apparent Zero Drift ..................13....................13 D.3.5 System Will Not Zero ................13.............13......13......14.......14 D.4.4 Pickup Adjustment/Replacement .......14............15........15........15 E.1 Transmitter Loads And Specifications .....16...........16..................16......16 E.5 Transmitter Sizing & Selection............16IFoot Mounted Versus Floating ShaftInstallations ...........................16IIVertical Installations .....................17IIIFatigue Considerations ..................17IVHigh Speed Operation ...................18VOil Mist Lubrication For High Speed Products ...................... 18VIHazardous Environments .................19VIIBelt and Chain Drive Considerations........20VIIICalibration and Compliance Certification .....20 When installed between a driver and load, MCRT torquetransmitters measure static and dyTorque sensing employs field proven, strain gagetechnology. A corrosion resistant, gaged with one or more bridges. The bridge measurestorque and cancels signals from bending and thrust lCareful temperature compensation eliminates zero, spanRotary transformers connect the rotating gages to sta-tionary, 4-20 mA transmitter circuitry. They provide highquality non-contact signal coupling to the rotating gages.Rotary transformers dont generate noise or wear. Theyare immune to ambient noise, vibration, lubricants andTransmitter circuitry is shielded from RFI which fact,combined with the current loop output, yields extraordinarynoise immunity, even close to large electric machines.Elimination of slip rings, brushes, radio transmitters andother limited-life, noise-generating elements furtherincreases performance and reliability. Moreover, the ferrite design makes these transmitters suitable for and other hostile applications. All models incorporateOption G which provides hardening to EMI from adjust-able speed drives and enhanced magnetic field i The tabulation lists condensed specifications applicableto standard products. See product literature for complete StandardEnhanced (% of F.S.)..... 0.100.05 (% of F.S.)......... 0.100.05 (% of F.S.)... 0.100.05 Zero (% of F.S./deg. F.)..... 0.0030.Span (% of Rdg./deg. F.).... 0.0030.Compensated Range (deg. F.).... +75 to +Maximum Usable Range (deg. F.).. - 25 to +185 Storage Range (deg. F.)..........- 65 to +.........4-20 mACounterclockwise (CCW) Uni-directional 4-20 mA...........dc to ........5% of Scale.......5% of Scale (see Figure 6).....10 to 28 Volts dcMinimum...........................0 Maximum................................()()* Subject to change without notice. ** End point method.F.S. denotes "Full Scale".Rdg. denotes "reading".deg. F denotes "degree Fahrenheit".A. Mechanical InstallationA.1 ApplicabilityThis discussion is applicable to both MCRT shaft, and 4 Figure 2. Floating Shaft Installation Your torque transmitter installation method dictates thetype of coupling needed. There are two installation meth-Floating shaft installations are applicable to both shaft andflanged type transmmitters. A single flex coupling isinstalled at each shaft end. It takes out angular misalign-ment, and the transmitter "tilts" to take out parallelflexible strap to prevent housingrotation and to strain relieve the 2-wire cable. Caution:When torque loop wires are run in a short, rigid con-duit, you must foot mount the transmitter. Alternately,Install a foot mounted torque transmitter between flex couplings as shown. The double flex couplings accom-Appendix I discusses the choice of a foot mounted or afloating shaft installation. It also contains additional com-ments on coupling selection. For either installation method,Use a slight interference fit (0.0005 inches per inch of shaftdiameter) and follow the coupling manufacturers'instructions. Before installation, lightly coat the torquetransmitter shaft with an anti-seizing compound suitablefor use at 400 deg. F. Next, heat the coupling hub, not thetorque transmitterto approximately 400 deg. F. Then,transmitter shaft without significant resistance. That is,coupling installation force shouldn't exceed 10% of theaxial load tabulated in C.3. Next, allow the assembly tocool to room temperature. Then, repeat the process for theIf desired, use forced air to accelerate cooling. Air coolingavoids contaminating the torque transmitter with anti-seizing compound. If cooling is speeded with waterorient the torque transmitter to prevententry of water mixed with anti-seizing compoundclearance exists between the coupling and the torquethe shaft-to-coupling fit is snug enough to prevent MCRT TORQUE TRANSMITTER INSTALLATION, OPERATION AND TROUBLESHOOTING GUIDE5 Use insulated gloves when handlingStop the hub installation if the pressingforce exceeds a few pounds. Remove thecoupling. Cool all parts, and then inspect forburrs on the coupling bore, shaft, keys andkeyways. If the parts are burr free, check thebore size and verify the coupling keyway transmitters are bi-directional. Their output signalpolarity reverses when the direction of transmitted torquereverses. Himmelstein uses the following convention forthe shaft turns CCW, whenReversing a torque transmitter the torque direction or magnitude. Therefore, it will haveno effect on the torque transmitter output signal. Select,per B.2.2, the appropriate operating mode (one of 4) forvalid transmitter operation; see Figure 7. If in doubt abouttorque polarity, select either bi-directional mode andobserve the output signals during normal machine opera-foot mounted torque transmitter per Figure4 will provide increased uni-directional thrust capacity. Be-cause dynamic thrust loading is usually bi-directional, it'ssafest to limit bearing axial (thrust) loads per C.3. tation does not affect the thrust capacity of torqueWhen axial bearing loads are uni-directional, tation illustrated in Figure 4 increases the uni-directionalincreased uni-directional rating applies only to optimumVertical installations frequently require special mountingand coupling selection considerations. Refer to AppendixThis section is applicable to all MCRT torque transmitters.Connect the loop power to the screw terminals provided;see figure 5. Reverse polarity protection is standard. Ob-serve the load resistance limits specified and plotted inThe transmitter case should be connecteddirectly to earth ground when conduit isn't used or, ifits not reliably grounded. Although any wire may bea shielded twisted pair will per- 6 Figure 6. Permissible Loop Load Factory settings for this transmitter are listed on the cover.Unless ordered otherwise, MCRT torque transmitters areshipped with the CW bi-directional mode and 1.5 hertz cutoff selected. That mode selection permits measure-ments in bi-directional and/or reversing shaft systems.You may also use it to experimentally determine the torquedirection. Then, after it is known, the transmitter modeEach transmitter is factory calibrated on stands traceable to NIST. CW and CCW equivalentcalibration torques are referenced to that dead weightcalibration. That calibration data and a compliance certif-ication are appended to this document. Appendix VIII con-Figure 7 defines the transmitter operating modes. To1.Unscrew the electronic housing cover.2.Switch to either CW or the CCW mode, as desired.3.Then, switch to either the bi-directional or 4.Next select either the 1.5 hertz (Hz) or 200 Hz filterposition as needed. The 1.5 Hz cutoff is usuallypreferred because it filters out most machvibration torques and provides stable, accuratereadings of average torque. The 200 Hz filter ismost useful for wideband studies and very fast5.Finally, re-adjust the and span controls inThese adjustments must be made with zero torque on To achieve zero torque in installations thatcan "lock-in" friction torques (between gear drives, onpump and other sealed shafts, etc.), break or disconnect1.Adjust the zero control for zero torque outptut, i.e.,4 mA (@ 0 lbf-in) in either uni-directional12 mA (@ 0 lbf-in) in either bi-directional mode.2.Depress and cal switch, then adjust the MCRT TORQUE TRANSMITTER INSTALLATION, OPERATION AND TROUBLESHOOTING GUIDE7 Output Current* Equivalent Cal Torque* Output Current* Equivalent Cal Torque* For continuous service usage, make monthly calibration andzero checks per B.2.3, above. When used intermittently,perform those checks before each test series. In applica-tions requiring high accuracy, perform an annual transmitterdead weight calibration. If the torque transmitter is over-loaded or operates abnormally, then calibrate/inspect it atHimmelstein offers dead weight calibration service,traceable to NIST, for all its products. Two levels of preci-sion are available; 0.02% and 0.002%. If you purchased atransmitter with readout, return both for a system calibration.A system calibration will provide the highest measurementaccuracy as well as assurance that all system componentsexplosion proof passive (Code P) and zero velocityspeed pickups (Code Z) are options for MCRT torquetransmitters. A speed pickup is used when thespeed pickup is omitted. Both pickup types produce exactly60 pulses per shaft revolution. Hence, their output passive speed (Code P) pickup requires no externalpower. Its output voltage is approximately proportional tospeed. Thus, below 25 to 100 rpm, a pickups' output voltage may be too small to be useful.However, the output voltage of a is independent of speed. Therefore, they are thechoice for low speed measurements. Zero velocity pickups also preferred in noisy electrical environments, i.e.,where SCR and Triac Motor Controllers and similar devices Function WhiteSignalRedSignalGreenCase Ground*:Signal wires are isolated from the connector shell.Refer to the manufacturers' manual for speed siconditioner/readout connections. Use a stranded andCable Diagram for SHC Speed Signal ConditionersFigure 8 shows connections for SHC Models CTUA, UDCAand 700 Series Instruments. When using another readout, 8 Figure 8. Code P Passive Speed Pickup Cable Figure 9. Code Z Speed Pickup Connector Figure 10. Code Z Speed Pickup CableB.3.3 Code Z Speed Pickup PinoutPin A+ Supply (8 to 28 Volts DC) BOutput Signal CCommon:All pins are isolated from the connector shell. :MS 3106A-10SL-3S (SHC P/N224-5361; includes cable clampRefer to the manufacturers' manual for speed signal condi-tioner/readout cconductor cable. Belden Type 8723 (or equal) is recom-Cable Diagram for SHC Speed Signal ConditionersFigure 10 connections are for SHC Models CTUA, UDCAC. Operating & Safety Considerations torque transmitter within its full scale;The overload rating of an MCRT transmitter is usually 4times full scale; but can be 2.5 or 3 times full scale. Thistransmitters' overload rating is listed on the cover sheet. AHimmelstein torque transmitter will not yield (evidenced bya non-return to zero) or fail if subjected to an Both the full scale and overload ratings are based on thepeak stress seen by the transducer. They are independentof stress duration except, for cyclical (or fatigue) loading MCRT TORQUE TRANSMITTER INSTALLATION, OPERATION AND TROUBLESHOOTING GUIDE9 Figure 11. Reciprocating Machine Torque Profile Virtually all rotary power producing and absorbing devicesproduce pulsating rather than smooth torque and power.Furthermore, starting and stopping generates torqueThus, in addition to its average torque and speed values,the driveline torque usually includes a fundamental (driving)frequency and superimposed harmonics. It may also havetransient torque pulses. The Figure 11 waveform is typicalof what occurs in the real world. Torsional vibration magni-tudes are difficult to estimate and can be amplified by theFor these reasons, a conservative design approach dictatestorque transmitter overload region be used as a safetymargin for unexpected loads. Do not knowingly operatein the overload regionIf you expect torques in the over-load region, then change to a torque transmitter with a high-If an MCRT torque transmitter sees peak-to-peak torqueswithin its full scale rating, it can handle full torque reversalswith infinite fatigue life. When peak torques are cyclical, andexceed the full scale rating, then fatigue failure can occur.line, developed torque can be several times its rated torque.Thus, a torque transmitter sized to handle the motors' ratedload torque, can be overloaded during starting. Drivelinesare particularly vulnerable when oversized motors drive lightTo avoid damage when starting high inertia loads, either userated for the starting torque or, limit thestarting torque to a safe value. Techniques to limit electricAdd inertia to the input side of the torque trans-mitter. Before operating, verify the motor canUse compliant, shock absorbing shaftcouplings. Careful coupling selection and thor-ough analysis of the resultant driveline is essen-tial. Under some conditions, such couplings can 10 torque transmitter bearing design provides long life,smooth running, and avoids bearing torque measurementerrors. These results are achieved, in part, by providingoptimum bearing pre-load. A lower pre-load would degradehigh speed performance. A higher pre-load would increasebearing friction torque, increase measurement error, andIn a floating shaft installation, the stator must be so total loads, including the stator restraint andshaft runout, don't exceed its bearing rating. When the stator is foot mounted, the coupling must be sufficient to take up axial shaft motions andhold the bearing loads within the limits specified in theWhen using shaft and flanged torque transmitters inbelt/chain drives, pillow blocks are usually needed to isolatethem from radial bearing and bending loads (see C.4).Consider pulley or wheel type torque sensors for suchservice. Their bearings are isolated from the belt loads, andthey accept large radial and bending loads without damage (lbs)(lbs) 39001X 1535 39002X3080 39003X35100 39004X35110 39006X55150 39007X70200 39008X80220 39009X3001,000 39010X1,0003,000 **See A.4.2 for increased uni-directional axial load ratings. Axial (lbs)(lbs) 39060X2575 39061X2575 39070X50150 39080X80220 39090X3001,000 39091X1,0003,000Flanged models must be mounted as floating shafts. If theyare used without flexible couplings, alignment must limit bearingloads to indicated values. Observe bending and thrust limitsAny moment or force the torque transmitter sees, other thanthe transmitted torque, is an extraneous load. Dependingon the installation, these could include bending momentsand axial thrust. Crosstalk errors from such loads, ex-pressed in pound-inches, are typically 1% of the pound-inches of bending or, 1% of the applied pounds ofWhen it is applied without thrust, a standard MCRT torquetransmitter, mounted as a floating shaft, can handle ashaft bending moment equal to one half its torque rating.Such bending may be applied simultaneously with ratedble bending input to a foot mounted torquetransmitter (Figure 13) is dictated by its bearing radial loadratings (see C.3), and by the need to prevent coupling"lock-up". When a coupling locks-up, it no longer providesone or more needed degrees of freedom and, ultimatelyUse pillow blocks to isolate a foot mounted transmit-ter from excessive bending and radial loads. Whenapplying such loads, don't exceed a transmitters'bearing load ratings; see Appendix VII for explicitWhen applied without bending, most MCRT torque trans-when mounted as a floating shaftthrust load (tension or compression) in pounds, applied toits shaft (see Figure 14), equal to its torque rating in pound-inches. Some units may have different thrust capacities;refer to the applicable Specification or Descriptive Bulletin.Such thrust may be applied simultaneously with rated MCRT TORQUE TRANSMITTER INSTALLATION, OPERATION AND TROUBLESHOOTING GUIDE11 Significant thrust loads are only allowable infloating shaft installations. Bearing axial loadslimit the thrust capacity of foot mounted torque torque transmitters within the maximumspeed rating published in the pertinent specificationand appearing on the cover of this booklet. The ratingsare bi-directional. Standard transmitters do not requireIf a driveline part fails, dynamic balance is lostfailures. Therefore, it is an essential safety re-quirement that guard covers, substantialenough to contain any separated mass, be in-Refer to Appendix IV for information on high speed torqueThe following data applies to all MCRT transmitters exceptoil-mist lubricated high speed units. Standard transmittersare permanently lubricated. Nonetheless, they should be re--lubricated every six months. Exxon Oil Company Nuto H-68(or equal) is recommended. Salient characteristics of H-68Specific Gravity @ 60 deg. F.0.882Density (lbs/gallon)7.344Viscosity (cSt @ 104 deg. F.)68(cSt @ 212 deg. F.)8.5Pour Point (deg. F.)-0.4Flash Point (deg. F.)453Distilled Water No RustSea WaterNo RustTo re-lubricate, remove the threaded closures at either endof the MCRT device; See Figure 15. Add lubricant per theDo not over lubricate. Too much lubricant willcause viscous losses and excessive heating atPermanentLubricationLubricationPer Limit* Bearing 39001X15,000 RPM10 drops 39002X15,000 RPM13 drops 39003X10,000 RPM16 drops 39004X10,000 RPM16 drops 39006X8,000 RPM4 cc 39007X6,000 RPM5 cc 39008X3,600 RPM7 cc 39009X1,800 RPM13 cc 39010X1,200 RPM26 cc 39060X8,000 RPM8 drops 39061X8,000 RPM8 drops 39070X5,500 RPM20 drops 39080X3,600 RPM7 cc 39090X1,800 RPM13 cc 39091X1,200 RPM26 cc 12 Special order, suffix "H", high speed devices must be oilmist lubricated. Refer to Appendix V for lubrication instruc-Don't flood a torque transmitters' internal volume with liq-uids. At higher operating speeds, viscous losses can cause devices are immune to spray from mineral basedoils and natural, hydrocarbon hydraulic fluids. When usingsynthetic fluids, verify they are compatible with plastic andelectrical insulation. Protect the torque transmitter fromcontact with fluids that attack insulation or plastics. Warran-Airborne abrasives can cause premature bearing failure.When they are present, consider using an air purge toprevent invasion of such materials. See Appendix VI forRefer to Appendix VI when operating in hazardous environ-These discussions suggest procedures for identifying adefective system component. They are an aid for operatingpersonnel. Special training and adequate inspection, testembly fixtures are needed for extensive repair work.Possible trouble sources include the installation, the torquetransmitter, the cabling and the readout device. The bestprocedure is to isolate the problem part, then correct orreplace it. Otherwise return the defective part to the factory.Inspect the torque transmitter for physical damage. If theshaft is locked or a rub exists then, remove the speed pick-up, if present, per instructions contained in D.4.4. If thefault clears, reinstall the pickup following D.4.4 instructions.Make electrical checks for continuity and shorts; see B.2and B.3 for connections. Verify that the torque loopconnections are tight and overall loop resistance iswithin that allowed per Erraticconnections causing loop resistance to violate the ble envelope can cause signal noise. If noise is still a prob-lem, replace the loop cable with a twisted pair. Similarly, re-B.3. Examine the torque and, where present, sfor obvious damage. Replace damaged cables. CleanExamine for physical damage, blown fuses and/or looseparts. Correct any defects; refer to the manufacturers'Check the transmitter circuitry for a blown fuse and replaceit if necessary. The fuse is located on the upper circuit boardand must be soldered in place. Verify that loop power ispresent, its polarity is correct, and the loop cable is intact,i.e., loop voltage appears at the transmitter terminals andthat it is within specifications per Figure 5. Finally, verify thatoad is within the specified maximum for the voltagesupply. If all checks are negative, the problem is in the If the cable is checked per D.3.1 above and found normal,then the problem is the torque transmitters. Return it forCheck for a Drifting Amplifier/Receiver. With-out changing its span control setting, re-connectit to a known good 2-wire transmitter. If the driftremains, the torque transmitter is ok. Clean theinput connections with an approved cleaner. Ifthat does not clear the problem, theamplifier/readout is drifting. Analyze and correctTorque transmitters installed in a drive which hashysteresis or friction torques, may appear to havelong term drift when there is none. For example,when installed between a pump and a gear drive,the torque reading may not return to zero after atest because of locked in friction torque. Thetorque transmitter sees and reads that locked intorque. Always zero a torque transmitter with notorque on the driveline in the case cited, witha coupling disassembled. At the end of the test,the shaft should be mechanically "shaken" or acoupling broken, to reduce the driveline torqueto zero. Otherwise, the torque transmitter willread locked in torque. A rub between any rotatingonary part is a common cause of frictVerify the shaft couplings and other rotating parts Per-form a transmitter substitution per D.3.3. If theamplifier/receiver output is stable, then theCheck For Driveline Torque Variations. driveline may have a low frequency oscillation whichthe torque transmitter reads (see C.2.1). Engagethe transmitters 1.5 hertz filter. That action willremove torque signals above 1.5 hertz. If the read-ings steady, then you may wish to identify the phys-ical cause of the shaft torque variation or, remove itwith mechanical filtering techniques; see E.4. Os-cillographic signal analysis is often helpful underthese conditions; however, during this analysis. If very large, highinertia machines are used, or large machines areused in a control loop, torque and speed oscillationscan be present below 1.5 hertz. They can be iden-tified with an external (to the transmitter) low passCheck the Transmitter. Substitute a 2-wire transmitter for the one in question. If it can bezeroed and operation is normal, then the problem isin the torque transmitter. Otherwise thereadout/amplifier is at fault. Repair it or return it to theVerify the Torque Input is Zero. If the torquetransmitter is installed in a driveline, break or removeone of the couplings. If the system still can't bezeroed, then the problem is either the cable or thetorque transmitter. Verify cable integrity, configurationand connections and check the torque transmitterSpeed measurement problems can originate in severalcomponents. They include the speed pickup, the readoutinstrument, and the interconnect cable. The best procedureis to isolate the defective element and then correct orVerify the Shaft Speed is Within the MeasurementCode P passive speed pickups have a practicallower operating speed range of 25 to 100 rpm, depdout models.Run the shaft at a higher speed and verify the problemstill exists. Zero velocity pickups will work down to zerospeed. However, most Himmelstein speed readoutshave a lower operating limit of 5 to 10 rpm. Verify the Speed Pickup Signal is Normal.Measure peak output voltage at a constant sIf no output exists, verify the cable is intact; replacedefective cables. See D.4.4 for pickup output data.If the signal is too low, then re-adjust the pickuplocation per D.4.4. Misadjustment can causeVerify the Speed Readout is Operational. Connecta known frequency to the readout input. It shouldan input level of 0.1 volts, rms. If no output ispresent, the readout is defective and must becorrected or replaced. Otherwise the problem isin the cable, or the pickup, or the operating sCheck for Cable Faults. In addition to the usualchecks, make certain the shield is in place andonly grounded at the amplifier. Verify there is noCheck the Pickup for a Ground Fault. Thereshould be no connection between the signal wiresCheck the Speed Readout Operation. the techniques described in D.4.1, verify theVerify Pickup Operation. Verify the pickup outputis both normal and stable while the shaft is rotatingVerify Your Drive Speed is Stable. Some driveshave significant speed variations caused by controlsystem instability, torsional vibrations, etc. Toeliminate this possibility, use another drive source preferably a direct drive motor running between600 and 3,000 rpm. Alternately, observe the torquevariations on an oscilloscope. If they track the speedvariations and both signals are stable with the sstationary, then the drive is probably unstCheck the Cable, Speed Pickup and Speed Readout per D.4.2 above. If a defect is found, correctCheck for High Ambient Electrical Noise. If the torquetransmitter is installed adjacent to large electricalmachines, or the machinery is powered by Solid StatePhase or Frequency Speed Controllers, significantnoise interference can be present. Remove powerfrom the machines and controls or, turn power to anadjacent machine on and off. If the readout stabilizeswhen power is off, use the techniques described below.Isolate the instrument from the machine powerReduce the noise by providing one cable tray orconduit for the speed instrument cable and a separatetray for the machine power and control cables. Ifpossible, use twisted and shielded wire pairs forIncrease the speed signal level by replacing theCode P passive speed pickup with a Code Z zerovelocity pickup (and cable). Then, adjust the samplifier to optimize the signal-to-noise ratio. In-structions for optimal adjustment of Himmelsteinspeed amplifiers can be obtained from the factory.Standard speed pickups are field changeable. They threadinto the stator housing and are secured with a jam nut. Loosenthe jam nut to remove or adjust the pickup. Both the passive(Code P) and zero velocity (Code Z) types require radiallocation adjustment. These adjustments are described below. The nominal outputs of Code P passive pickups are tabulatedbelow. Use an oscilloscope to measure open circuit voltages,while the shaft rotates at the reference speed. The waveformis a distorted sine wave. Make the adjustment using theBack out the pickup by turning it counterclockwise.With the torque transmitter shaft rotating at thereference speed, slowly turn the pickup clockwiseuntil the output is within 15% of the tabulated vIf a rub occurs, stop! Back off the pickup untilRotate the shaft by hand to verify no rub exists.Finally, verify the output is correct at the referenceThe adjustments described take time and require test facilities.If neither is available, you may use the following lessWith shaft motion stopped,turn the pickup inSlowly rotate the shaft to verify no rub exists. IfOpen CircuitReferenceTransmitter Output Speed Model Number (Volts pk-pk)(rpm)39001X3.05,00039002X3.05,00039003X2.01,00039004X2.01,00039006X1.51,00039007X1.51,00039008X2.01,00039009X1.550039010X1.750039060X2.01,00039061X2.01,00039070X2.01,00039080X2.01,00039090X1.550039091X1.7500The output of a Code Z Zero Velocity Speed Picbetween approximately + 0.3 Volts and the supply voltage.When used with a Himmelstein readout, the output wfrom +0.3 to about +11.7 volts. Certain specialihave TTL (+0.3 to +5 Volt) outputs. To adjust the pickup,With shaft motion stopped,turn the pickup in(clockwise) until it makes contact with the rotor assembly.Back off the pickup (counterclockwise) a quarter ofSlowly rotate the shaft to verify no rub exists. If a rubCode PZeroPassiveVelocity Pickup Pickup 39001X900-1009900-1007 39002X900-1009900-1007 39003X900-1009900-1007 39004X900-1009900-1007 39006X900-1009900-1007 39007X900-1009900-1007 39008X900-1009900-1007 39009X900-1009900-1007 39010X900-1022900-1023 39060X900-1009900-1007 39061X900-1009900-1007 39070X900-1009900-1007 39080X900-1009900-1007 39090X900-1009900-1007 39091X900-1022900-1023 The following paragraphs summarize references pertto torque transmitter operation, installation and troubleshooting.Those references are too detailed and technical to be madea part of this document. The referenced material is availablefrom the factory. Some of it may be found in the rear ofthe torque measurement section of Himmelstein ProductThe cover sheet of this document contains device explicitspecifications for the serial number in use. Any specmodifications are identified. Page 3 contains an abbreviatedspecification. The Models' Technical Bulletin contains cspecifications, and outline information; please see BulletinTechnical Memorandum 7850 contains useful informationon coupling selection, mounting, measurement and opconsiderations. It includes sketches of acceptable andunacceptable mounting arrangements. Addendum #1 toTechnical Memorandum 7850 lists commercial sourcesTechnical Memorandum 7551 discusses the critical sof installed torque transmitters (and torquemeters). It contprocedures for estimating shaft critical sTechnical Memorandum torsional resonant frequencies, and describes how to avoidtheir destructive effects. It includes theoretical as well asBulletin 705 provides criteria for properly sizIn addition to average drive torque and/or power requirements,the effect of the lThe bulletin provides a simple, easy to follow selectionFloating shaft installations have two principal disadvantages.First, if the driving or driven machine is frequently changed,and the torque transmitter is unsupported during the change-over, then pillow blocks must be added to handle this situation.Second, the of a foot mounted toris usually much higher than a floating shaft tIf neither of these concerns are important, consider a floatingshaft installation. They are less critical to align. Furtbecause they don't directly transfer tto the torque transmitter bearings, floating shaft installationscan usually handle much greater thrust and bendingVery high speed applications should employ foot For either installation method, choose couplings that will expected shaft end float installation parallel and angular misalignments maximum expected shaft speed maximum expected shaft torque expected extraneous loadingWhere dynamic, once per revolution torque measurementsare important, use constant velocity, zero backlash, torsirigid couplings. If operated at high speed, dynamically balancethe torque transmitter and coupling assembly Install the couplings in accordance with the man-Technical Memorandum 7850 has detailed installationdiscussions. Use only installations recommended in thatmemorandum. If in doubt, consult the factory. Addendum7850-1 lists c MCRT TORQUE TRANSMITTER INSTALLATION, OPERATION AND TROUBLESHOOTING GUIDE17 Figure 16. Vertical Torque Transmitter Installation In vertical installations, the torque transmitter and couplingsoften carry the weight of suspended devices carry the live thrust of a pump impeller, mixer blade, etc.Even when those dynamic loads are absent, the upper shaftcoupling must carry the weight of the torque transmitter andA flanged torque transmitter with properly attached couplingscan support substantial thrust loads. It is well suited for verticaldrives. On the other hand, neither axial keys nor the frictionof interference fits will carry significant thrust. Special shaft torque transmitters can be supplied with radial keywaysVertical floating shaft installations don't transfer thrust tothe torque transmitter bearings. Thus, floating shaft in-stallations are simpler and usually safer than foot mounted. See C.4.2 for data on shaft thrust ratings.Vertical, foot mounted installations must limit torque torque transmitters can hversals with infinite fatigue life. When peak torques are cyclical,and exceed the full scale rating, then fatigue failure can occur.When operated at peak torques beyond its full scale torquerating, a torque transmitters fatigue life is a functfactors. They include the torque magnitude, the mand type of extraneous loads simultaneously applied, thetotal number of loading cycles, the torWhen large torsionals are present, the following steps willReduce the magnitude of torsional inputs by usingAvoid torque magnification by eliminating torsionalresonant frequencies in the operating range; see E.4. 18 Size the torque transmitter so Check peak torque values, over the range of by observing the torque onan oscilloscope while the transmitter filter bandwidthIf these guidelines are violated, shut down immediately orOn special order, torque transmitters can be supplied thatoperate at higher speeds than their standard counterparts.The cover sheet of this document lists the speed rating ofyour transmitter. High speed devices have strengthenedrotor assemblies, revised bearings and provision for oil mistAdequate bearing lubrication. Too little will resultin bearing failure. Too much, produces excessiveheating from viscous losses A stable, usually foot mounted, vibration-freeinstallation operating either well below or well abovethe first shaft system torsional resonant fr(see E.4). The operating sA dynamically balanced torque transmitter andcoupling assembly. All other driveline call reasonable safety precautions includingthe installation of safety guards around rotatingUse oil mist lubrication for special high speed transmitters.These products contain structural modifications and oil mistspeeds than their stfor the maximum speed rating of the torque transmittersupplied. Typically, each end has two 1/8" NPT tappedlubrication ports. Use either port for and the other port Make the port selection on the basis of installationAvailable options include NPT body fittings, manifoldingings, and a lubricator with manifolding. manifolding is furnished, the torque transmitter has a singleCertain high speed torque transmitters have multiple Drain ports to enhance lubrication. When so furnished,the device manual will include special manifold information.Before operating an externally lubricated torque tverify the lube path is clear by confirming oil is recoveredfrom all drains. Loss of lubrication will cause bearingfailure. A blocked drain port will trap excess oil, causeoverheating from viscous losses, and possible device Filter:P/N F11-200-M3PARegulator:P/N R11-200-RGLALubricator:P/N L11-200-MPNASHC P/N 944-1006 is a complete assemblyincluding filter, regulator, lubricator and oilViscosity (cSt @ 130 deg. F.)9.0 (cSt @ -65 deg. F.)11,740Flash Point (deg.F.)455Pour Point (deg.F.)-80Rust/Corrosion InhibitedYesAntiwear PropertiesYesModelOil Rate*Air Flow* (Drops/Min) (CFM) 39001XH31.539002XH31.539003XH4439004XH4439006XH5539007XH6639008XH6639060XH4339061XH4339070XH5639080XH66When they are used in hazardous locatpurge MCRTtorque transmitters with air (or inert gas). Properly used,an air purge will prevent explosive, flammable or corrosivefluid, or airborne abrasive, from entering the torque transmitter.The user must interlock and monitor the purge supply incompliance with applicable safety codes. Introduce thegas purge through the torque conduit fitting. Then, assumingthe loop wires are fed through an approved conduit, andsuitable interlocks are used, the transmitter can be operatedA special Code P explosion proof speed pickup should beused in hazardous locations. Run the speed wires throughan approved conduit. If its necessary to use a zero velocity(Code Z) pickup, then make connections via suitablesafety barriers. Safety barriers are sealed, passive networksinstalled in each wire that connects the hazardous and safelocations. They limit electrical energy passing between the Caution. Don't install a pulley or sprocket on thetorque transmitter shaft unless the transmitters' 1 + T2]*[1 + L/H]These criteria assure safe torque transmitter bendingand bearing loads. To simplify your analysis, assume = 0 and calculate T = [Torque Rating*2/D]. Then,make [T + T2] = 1.1 times the calculated value of TWhen the bearing load ratings don't meet the abovecriteria, use pillow blocks and a jack shaft to ispulley/belt loads; see Figure 19 example. Alternatively,consider a pulley or wheel type torquemeter. Their bearare isolated from the belt loads, and they can acceptlarge radial and bending loads without damage orHimmelstein hereby warrants, to their original purchaser, all its torquemeasurement products to be free of defects in materials and work-manship and to conform to the published specifications in effectat the time of order. The warranty period begins at the date of originalOur liability under this warranty is limited to the obligation to repairor, at Himmelstein's option, replace without charge, F.O.B. our plantin Hoffman Estates, IL, any part found to be defective under normal1.The defect occurs within the warranty period.2.Himmelstein is promptly notified in writing upon discovery3.The original parts are returned to Himmelstein, Hoffman4.Himmelsteins' examination shall disclose to its satisfactionthat such defects have not been caused by abuse, accident,5.No unauthorized modification has been made.Equipment or merchandise not manufactured by Himmelstein isnot warranted by Himmelstein but carries its manufacturers' warranty.Our performance warranties are stated in printed specifications foreach standard product and in a written description included in systemquotations. Himmelstein specifically disclaims any other performancewarranties or implied warranties of fitness for a particular purpose.This warranty is expressly in lieu of all other warranties expressedor implied (except as to title) and constitutes all of Himmelsteins'CALIBRATION AND COMPLIANCE CERTIFICATION(SpecimenHimmelstein certifies that, before shipment from its factory,this torque transmitter was thoroughly tested and inspectedand was found to meet or exceed its publishedspecifications. The listed calibration values were obtainedIt further certifies that its calibrattraceable to the NATIONAL INSTITUTE OF STANDARDS......Date: Certified by: ........Date: ............