Digital RWT310/320 series Torque Transducer
Contents
1. TORON SS qe SENSOR NM NAY Y TECHNOLOGY Digital RWT310 320 series Torque Transducer TorqSense Digital RWT310 amp 320 series transducers with integral electronics now offer cost effective non contact digital rotary torque measurement using Surface Acoustic Wave technology suitable for torque monitoring testing or controlling drive mechanisms TorqSense RWT310 amp 320 series transducers and their technology are particularly appropriate for OEM applications Benefits e Minimal shaft length High shaft stiffness e Low inertia High Speed capability because electronics are not fixed on to shaft HE e Non contact measurement e High bandwidth 200 safe mechanical overload High accuracy and resolution Excellent noise immunity Integral digital electronics Operates both statically and dynamically Clockwise anti clockwise e Any full scale torque can be specified within Standard range 1Nm through to 10 000Nm e Lifetime warranty Consult factory for ranges greater than 10KNm High speeds available on request Technology TorqSense patented technology is the measurement of the resonant frequency change in frequency dependent surface acoustic wave devices caused when strain is applied The signal is coupled via a non contact RF rotating couple from the shaft to a fixed pick up Integral electronics enables the resonant frequencies to be measured and offer u2. 5 USB 2 0 full speed 12 Mbps Digital output CG CANbus output H In place of RS232 ouput High Speed Bearings NES pene 2 Below Consult factory for maximum Sealed Bearings o 9 speed EA See Note 4 below Note 1 Any torque FSD is possible between ranges please specify rated torque Note 2 Max rated torque specified should not be exceeded Note 3 At very high speeds for better balance the factory recommend plain or splined shafts Note 4 Transducers fitted for IP65 will have running speeds considerably reduced increased drag torque and accuracy can be affected Note 5 2 x analog channels available Default settings are Channel 1 voltage current torque Channel 2 voltage current speed or power if ordered Sensor Technology Ltd 2006 2007 2008 RWT3177R Rev4C RWT310 320 Series Torque Transducers Connector and Lead Options RWT310 320 Option Remarks Purpose Series Code Connectors amp Leads Connectors amp Leads RWT310 RWT320 12 Pin Lumberg female 12 Pin Lumberg male Digital Lead Length 2 5m For connecting RWT to 12 Pin Lumberg male to 15 way D ACC 4 users system via 15 pin D type connector male connector Digital Lead Adapter Length 1m For connecting RWT to PC 15 Way D type female to RS232 and Via RS232 Power Connectors Also needs Digital Lead ACC4 to connect to RWT Digital Lead Adapter Length 1m For connecting RWT to PC 15
3. Way D type female to RS232 USB via USB Option G or RS232 and Power Connectors Also needs Digital Lead ACC4 to connect to RWT Analog Lead Length 2 5m For connecting RWT to 12 Pin Lumberg female to 15 way D ACC 3 users system via 15 pin D type connector female connector RWT310 320 Series Torque Transducers Additional related products Code Remarks Purpose Transducer Display ETD ETD Display readout AC Mains Adapter Power Supply PSU 1 For providing 12 32Vdc Transducer Signal Breakout Unit SBU 1 Torque Monitoring Software ACC 3 amp 4 12 Pin Lumberg Ole O 15 Way D Type connects to ACC4 Ae 15 Way D Type connects to ACC4 Sensor Technology Ltd 2006 2007 2008 RWT3177R Rev4C When ordering a Torque Transducer please note that any torque FSD Is possible between ranges please specify fated torque and options using the following format A basic transducer with torque and speed outputs rated and calibrated to 15Nm FSD with keyed ends 10v and IP65 protection For example RWT 311 15Nm Your transducer requirement RWT Max speed if applicable RPM Connector amp Lead options if applicable See over Additional related products if applicable See over Glossary of terms and definitions used in this datasheet e Surface Acoustic Wave SAW An acoustic wave travelling along the surface of a material having some elasticity with a
4. individually via Default mode gt 2000 RPM a digital connection for Analog output Rotational speed max 30 000 20 000 15 000 12 000 9 000 6 000 Temperature Measurement method IR temperature sensor monitoring actual shaft temperature Temperature accuracy Pe O D AA temperature Trt Operating range ATo ft 50 Storage range ATs RO AA S T O Specifications linearity 0S Hysteresis FS Resolution FS Repeatability Fa UO SU RWT310 Series Transducers ONLY Frequency response ff 20 C SM 0 25 0 5 for 2Nm and below See Note 4 RWT320 Series Transducers ONLY Frequency response __ p 1620 _810_ 405 202 101 50 2 2 __ See Note 4 Digital averaging enote 1 2 4 8 amp i6 32 64 128 Analog output eee Options available 1 5 10 Unipolar RWT310 Series default setting is 5Vdc Torque Speed Power RWT320 Series output voltages are user selectable a Torque Speed Power RWT320 Series output currents are user selectable Load impedance O A AO A Digital output RWT320 Series Transducers ONLY Output type RS 232 Standard USB 2 0 full speed 12 Mbps optional CAN bus optional _ Sampling rate AR OO ss Power supply Nominal voltage Vs en Current consumption Is 500 max Power consumption We sosa Allowed residual ripple 500 mVp p of excitation voltage above nominal supply voltage Viipple Electromagnetic compatibility EMC compatibility pO E
5. N 61326 2006 Note 1 Any torque FSD is possible between ranges please specify max rated torque Note 2 Max rated torque should not be exceeded Note 3 Please consult factory for applications requiring rotational speeds that exceed maximum figures given Note 4 SM Static Mode Dynamic values will depend upon user application and has to be adjusted accordingly Note 5 Digital averaging can be configured by user to optimise accuracy frequency response for specific user applications Digital averaging default setting is N 16 For details see User Manual Note 6 Transducers fitted for IP65 will have running speeds considerably reduced increased drag torque and accuracy can be affected Data parameters measured at 20 C Sensor Technology Ltd reserves the right to change specification and dimensions without notice Sensor Technology Ltd 2006 2007 2008 RWT3177R Rev4C RWT310 320 Series Torque Transducers Dimensions 0 5Nm to 100Nm M4 x 6 5 DEEP Parameter Data Units Mechanical Properties Torque Max 0 6 13 17 100 Shaft Code a as ROI SRR ae ee Shaft Size Diameter Torsional _ 0 23 1 28 1 3 1 32 1 6 1 7 1 9 4 1 6 4 8 1 9 2 lll Stiffness Note 5 of inertia Ly er Max measurable 120 of rated torque load limit Static safe load 200 of rated torque breaking approx Transducer with 0 7 0 7 1 0 1 0 1 1 1 1 shaft weight approx Data parameters measured at 20 C Sensor Technolog
6. ansducer via PC BIT Self diagnostics for letting users know data is trustworthy that the transducer s torque speed ratings and calibration due date have not been exceeded Transducer configuration software to allow user to changes transducer variables e Ability to connect up to 10 transducers using USB e Simple Fail output pin Sensors to monitor shaft temperature for better compensation and accuracy RWT310 320 Series Torque Transducers Data Specification Parameter Condition Units OOOO RWT310 320 Torque measurement system Measurement method Strain Dependent Surface Acoustic Wave Resonators interrogated by an incremental electronic scanning method Torque range See Notes 1 0 0 5 0 11 0 21 0 101 0 501 0 2001 amp 2 below to 0 1 to 0 20 to 0 100 to 0 500 to 0 2000 to 0 10000 to0 10 to0 200 to0 1000 to0 5000 to0 20000 to0 100000 _Shaft size diameter 6 12 2 30 50 75 mm Rotation speed angle of rotation measurement system Measurement method Opto switch through slotted disc Direct output signal Pulse output direct from opto switch TTL 5V square wave output is independent of any analog or digital processing Digital Processing Processing Method Update rate for analog and digital outputs A Frequency Count Processing modes run q Y simultaneously and can Mode 2 Fast Method be applied to either Period Count O 2000 RPM RPM 3 analog channel or accessed
7. cally characterised by the magnitude of the system s response measured in dB There are two ways of characterising the system s frequency response e 0 1dB frequency range where the output magnitude of the signal is different to the input magnitude of the signal by not more then 0 1dB practically absolutely identical e 3dB frequency range where the output magnitude of the signal is 0 707 of the input signal This is a common standard for most applications unless it specifically says otherwise This standard is also used to characterise the TorqSense system s frequency response e Accuracy The degree of conformity of a measured or calculated quantity which will show the same or similar results Accuracy of the overall TorqSense system is limited by the combined error of several factors such as linearity hysteresis temperature drifts and other parameters affecting measurements If errors in the system are known or can be estimated an overall error or uncertainty of measurement can be calculated e Digital averaging The application of algorithms to reduce white noise In any electronic system electronic white noise is mixed with the signal and this noise usually limits the accuracy To reduce the influence of white noise and increase the accuracy of the system different averaging algorithms can be applied In the TorqSense system a flying digital averaging technique is applied to reduce the white noise commensurate with the level of accurac
8. mplitude that typically decays exponentially with the depth of the substrate e Strain dependent SAW resonators A type of elastic SAW device which changes its resonant properties when it is subjected to axial strain compression TorqSense uses this principle which is protected by a number of patents e Incremental Electronic Scan IES The most successful and precise method for interrogating strain dependent SAW resonators The IES interrogation method uses a processor controlled frequency synthesiser to excite the SAW resonators over a defined range of frequencies and measure the reflected signal TorqSense uses this patented method e Resolution of the IES method The minimum measurable number corresponding to the stress strain sensitive resonance point of the SAW resonator The value is limited by following the factors e frequency resolution of the synthesiser which is 1000 times greater then overall resolution of the system e relationship between frequency response and resolution Increments of the resolution will proportionally decrease the system s frequency response TorqSense systems are optimised for the best performance that suits most applications However on the RWT320 series models customers do have the capability to adjust the system performance e Frequency response of the IES method The measure of the TorqSense system s response at the output to a signal of varying frequency at its input The frequency response is typi
9. ons without notice Sensor Technology Ltd 2006 2007 2008 RWT3177R Rev4C RWT310 320 Series Torque Transducers Standard Range e Standard feature Optional feature Series Code MAA Torque Speed Power Outputs RWT310 RWT320 Torque only 310 320 Torque amp Speed 60 pulses rev 311 Torque amp Power 60 pulses rev 313 Torque amp Speed 60 pulses rev or Power Standard features Standard features User to specify RPM FSD when ordering User to specify Power FSD when ordering 371 Outputs are user selectable Keyed Shaft Ends K will have flats Voltage output 5v FSD Fixed AE Output is user selectable and unipolar Variable Value available on RWT320 series only Internal temperature measurement Deep grooved shielded bearings with oil lubrication Ingress Protection IP 54 Optional features Plain Shaft Ends Shaft length will be longer than keyed end shafts consult factory for length In place of Option B User to specify range scale when ordering In place of Voltage output options In place of Voltage output Unipolar voltages Fixed Current output 0 20mA Fixed Current output 4 20mA Fixed options Current output 12 8mA Fixed V In place of Voltage output options Current output is user Current output 0 20mA 4 20mA selectable and in place of amp 12 8mA Variable F Voltage output However user can reselect a Voltage output if required Note
10. ser selectable features digital outputs and diagnostics SAW devices are not affected by magnetic fields US Patents US5585571 US6478584 RWT3243R Software TorqView is an easy to use advanced torque monitoring software available to assist data recording and instrumentation displays that interface with Windows based PCs See TorqView datasheet Features 3 types of display Text files compatible with Matlab and Excel Real time chart plotting LabView VIs are available for users to design their own process control applications DLLs are also available for users to write their own custom software Ol rare Dale Digital Chart Setup About TorqSense RWT310 series transducers offer e Fixed voltage or current analog outputs one for torque and the other for speed or power for interfacing with legacy analog instrumentation BIT Self diagnostics for letting the manufacturer know that the transducer s torque speed ratings and calibration due date have not been exceeded Simple Fail output pin Sensors to monitor shaft temperature for better compensation and accuracy Whereas TorqSense RWT320 series transducers offer e 2 x user selectable voltage or current analog outputs one for torque and the other for speed power or peak torque for interfacing with legacy analog instrumentation Digital outputs such as RS232 and USB for interfacing with modern instrumentation and laptops Digital input for configuring tr
11. y Ltd reserves the right to change specification and dimensions without notice Sensor Technology Ltd 2006 2007 2008 RWT3177R Rev4C RWT310 320 Series Torque Transducers Dimensions 101Nm to 500Nm M5 x 10 DEEP Parameter Data Units Mechanical Properties Torque Max 175 225 265 350 500 Shaft Code FABLE Shaft Size 30 mm Diameter Torsional stiffness 9 8 kNm rad Note 5 Mass moment of 138 9 143 1 147 7 151 9 174 2 10 kgm inertia Max measurable 120 of rated torque load limit Static safe load 200 of rated torque breaking 1 1 1 1 1 1 Shaft weight approx AAA A e Transducer with 2 4 2 4 2 4 2 5 2 5 kg shaft weight approx Data parameters measured at 20 C Sensor Technology Ltd reserves the right to change specification and dimensions without notice Sensor Technology Ltd 2006 2007 2008 RWT3177R Rev4C RWT310 320 Series Torque Transducers Dimensions 501Nm to 10000Nm 2125 00 M6 x 14 DEEP 0 15 7 50 0 Units Mechanical Properties Torque Max 1100 2000 6000 10000 Shaft Code Shaft Size mm Diameter Torsional Stiffness 199 2 214 1 914 4 945 5 kNm rad Note 5 inertia kg m load limit Static safe load 200 of rated torque breaking AAA T HE approx Transducer with l shaft weight approx Data parameters measured at 20 C Sensor Technology Ltd reserves the right to change specification and dimensi
12. y required However as any averaging algorithm works as a low pass filter the more averaging that is applied the lower the frequency response Therefore each Torqsense system should be optimised to the customer s requirements by choosing the right combination of accuracy frequency response Please see relevant part of the Datasheet and User Manual ASS ENSORS AND COMPONENTS QSS Quality Systems Solutions GmbH Sensor Technology Ltd 2006 2007 2008 bai RWT3177R Rev4C T 0041 44 242 0000 F 0041 44 242 0010 info qss solutions ch www qss solutions ch
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