ETH-messtechnik DRVL Manuale utente
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Operator manual
English
messtechnik
DRVL
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©ETH messtechnik gmbh
This operator manual is not a quality agree-
ment or durability guarantee as set out in
Section 443 of the German Civil Code.
Specification changes, typing and printing
errors reserved.
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Content
Important instructions: ...................................................................................................4
1. Preliminaries ...............................................................................................................5
2. Applicability and instructions for use ..........................................................................5
3. Description and functionality of the device ...............................................................6
3.1 Torsional shaft .....................................................................................................6
3.2 Enclosure .............................................................................................................6
3.3. Principle of operation ........................................................................................6
3.4 Disturbances and their compensation.................................................................7
4. Conditions on location ................................................................................................ 8
4.1 Ambient temperature..........................................................................................8
4.2 Moisture and dust................................................................................................8
4.3 Chemical effects...................................................................................................8
4.4 Deposits ..............................................................................................................8
5. Mechanical installation................................................................................................9
5.1 Precautions to be taken when fitting the transducer ..........................................9
5.2 General assembly guidelines ...............................................................................9
6. The measurement-chain setup..................................................................................10
7. Electrical connection ................................................................................................. 11
7.1 Wiring instructions.............................................................................................12
7.2 Connectors.........................................................................................................12
7.3 Pin assignment for the connectors ....................................................................13
7.4 Extension cables ................................................................................................13
7.5 The power supply ..............................................................................................13
8. Pin assignment .........................................................................................................14
8.1 DRVL...................................................................................................................14
8.2 DRVL-n ...............................................................................................................15
8.3 DRVL-w...............................................................................................................16
9. Measurement outputs ..............................................................................................17
10. Re-calibration ..........................................................................................................17
11. Disposal ...................................................................................................................17
12. Specifications...........................................................................................................18
12.1 Electrical Specifications DRVL ..........................................................................18
12.2 Mechanical Dimensions DRVL..........................................................................19
12.3 Technical Specifications DRVL ..........................................................................20
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Important instructions:
The model DRVL torque transducer can be deployed as a component in a test
bench, for example.
The installation position of the drive and transducer sides should be taken into
account in applications where mass is critical.
Please note that in order to achieve greater sensitivity the transducer
has not been designed with the safety factors 2 to 20 that are common in me-
chanical engineering.
Please pay special attention to the specified overload factors.
Where there is a risk of personal injury or damage to equipment due to mechani-
cal failure leading to breakage, the user of the device must put in place adequate
safety measures (e.g., covers and guards, and overload protections). All applicab-
le accident prevention regulations must be followed.
The torque transducer is not approved for use in hazardous areas.
Opening or disassembling the transducer during the warranty period
will void the warranty.
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1. Preliminaries
The torque transducers are made of different shaft materials to suit the loads.
Torque transducers measure torque in the unit Nm.
Please refer to the relevant data sheet for the current technical specifications.
www.eth-messtechnik.de
2. Applicability and instructions for use
The torque transducers measure clockwise and counterclockwise loads. In case
of clockwise load, the output signal is positive.
The full-scale value is printed on the device label.
The torque transducers can measure both static and dynamic torques. The low
masses and high torsional stiffness are particularly beneficial in this context.
Please refer to the data sheet for the specified signal rise for the transducer.
The torque transducers need no maintenance as they are fitted with contactless
outputs. Their electrical outputs can be transmitted to remote test benches,
where they can be displayed, recorded, processed and used for control opera-
tions.
The torque transducers are precision devices and should be handled carefully
when transported and when being installed to prevent them being damaged by
shocks or if they fall to the ground. Torque peaks above the rated overload can
severely damage the torsional shaft. These peaks must be intercepted and absor-
bed if they cannot be avoided.
The limits for the permissible mechanical, thermal and electrical stresses are
detailed in the data sheet. They must be strictly observed. Please consider these
limits when designing, installing and operating the measurement setup.
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3. Description and functionality of the device
3.1 Torsional shaft
The torsional shaft is constructed with special aluminum or hardened carbon
steel to suit the full-scale value.
Strain gauges attached to the torsional shaft sense the shaft torsion, which is
proportional to the torque and is within its elastic range. The strain gauges are
arranged as a Wheatstone bridge circuit. The force is transmitted via cylindrical
shaft extensions with smooth shaft extensions or a featherkey as per DIN 6885.
A pulse disk for speed or rotation angle measurement can be fitted to the torsio-
nal shaft if needed. Please refer to the data sheet for more details.
3.2 Enclosure
The enclosure for the torque transducer is made of high-strength aluminum; the
enclosure surface is hard-anodized to protect it. The torsional shaft is supported
in the enclosure with two deep-grooved ball bearings. The transducer can either
be base mounted or flange mounted. An electronics module for conditioning
and analyzing the signal for torque, speed or angle of rotation is installed in the
enclosure.
3.3 Principle of operation
The torsional shaft, and thus the strain gauges, are elastically deformed by the
torsional force. The ohmic resistances of the strain gauges change proportional
to their change in length. The electronics module is connected in series and it
transfers the measurements by means of optical frequency modulation to the
enclosure.
The signal is then converted by the external electronics unit to an analog voltage
that is proportional to the change in frequency. Those signals and frequency
output are available as an electrically isolated signal for further processing.
The pulse disk on the torsional shaft is sampled with an encoder in the enclosure.
Two waveforms are available for analysis: (1) a square wave with 60 pulses/turn
for the speed option, and (2) two square waves offset by 90° with 360 pulses/
turn for the angle of rotation option.The direction of rotation can be detected
with the angle of rotation option. Channel A leads channel B by 90° for clockwise
rotation.
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3.4 Disturbances and their compensation
Flexural, axial and radial forces are disturbances and, hence, should be avoided.
We recommend the use of clamping hub couplings. They must be selected to
suit the operating conditions.
Shielded cables should be used for the electrical connections. The electroma-
gnetic compatibility (EMC)of the torque transducers are tested for compliance
with EN 55011:2011.
The immunity of the torque transducers to noise is tested to the following stan-
dards:
• 61000-4-2:2009
• 61000-4-3:2009
• 61000-4-4:2009
• 61000-4-5:2009
• 61000-4-6:2009
• 61000-4-8:2009
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4. Conditions on location
4.1 Ambient temperature
For best results, the device must be operated within the nominal temperature
range. The best operating conditions are constant and, if necessary, slowly
changing temperatures. The specified temperature errors apply if the tempera-
ture does not change faster than 5K/h. One-sided thermal radiation or cooling
should be avoided and appropriate technical preventive measures taken, if
necessary.
4.2 Moisture and dust
The torque transducers comply with protection type rating IP40 as per DIN
40050.
Note: There should be no moisture inside the transducer connector
4.3 Chemical effects
The torque transducers are not protected against chemical effects. They must
not be used in caustic or corrosive environments.
4.4 Deposits
Dirt, dust or other foreign substances should not accumulate so that they can
enter the bearing or the connectors.
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5. Mechanical installation
5.1 Precautions to be taken when assembling the transducer
• Handle the transducer carefully.
• Do not overload the transducer, even temporarily when assembling
the couplings, for instance.
If possible before assembling the transducer, we recommend you
connect it first electrically and monitor the torque with the analyzer.
• Axial and radial misalignments must be avoided.
• Make sure the enclosure is correctly connected electrically to
the grounded parts.
5.2 General assembly guidelines
The drive and transducer sides should not be swapped, otherwise measure-
ments (readings) will be invalidated during accelerations, for example.
When reading the device label, the drive side is on the right and the transducer
side on the left of the transducer. There is a small cavity in the cover on the
measurement side.
Flexural, axial and radial forces are disturbances that cause incorrect measure-
ments
Be careful with the thermal expansion of the assembly.
Measuring side mark
Direction of rotation for positive indication
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6. The measurement-chain setup
A measurement chain is required for the transducer to take measurements.
The measurement chain consists of:
• a torque transducer
• a connection cable
• a power supply and display unit
A power supply is required to supply the transducer with the necessary opera-
ting voltage. The transducer is fitted with a measurement amplifier (hence, no
other amplifier is needed). The measurement data can be transmitted to a lap-
top, for example, or displayed and analyzed with power supply and display units.
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