ETH-messtechnik DRVL Manual de usuario

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Operator manual

English

messtechnik

DRVL

Option „F“

with base/foot

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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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Inhalt

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 assembling the transducer..................................9

5.2 General assembly guidelines ...............................................................................9

5.3 Additional parts and suggested values for the installation .....................................10

6. The measurement-chain setup..................................................................................11

7. Electrical connection .................................................................................................12

7.1 Wiring instructions.............................................................................................13

7.2 Connectors.........................................................................................................13

7.3 Pin assignment for the connectors ....................................................................14

7.4 Control activation ..............................................................................................14

7.5 Extension cables ................................................................................................14

7.6 The power supply ..............................................................................................14

8. Pin assignment .........................................................................................................15

8.1 DRVL standard cable ..........................................................................................15

8.2 DRVL robot cable ...............................................................................................16

9. Measurement outputs ..............................................................................................17

10. Recalibration............................................................................................................17

11. Disposal ...................................................................................................................17

12. Datasheet DRVL.......................................................................................................18

12.1 Electrical Specifications....................................................................................18

12.2 Mechanical Dimensions DRVL-F.......................................................................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.

• IMPORTANT!

While assembling the couplings, don’t overload the transducer, even

temporarily. It is highly suggested to connect the transducer electri

cally first and monitor the torque signal in order to prevent exceeding

the torque range!

• 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 measurements

(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 mea-

surement 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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5.3 Additional parts and suggested values for the installation

Model DRVL-F DRVL-I-F DRVL-Ib-F DRVL-II-F DRVL-III-F DRVL-IV-F DRVL-V-F DRVL-VI-F

Addional parts:

1. Hexagon socket

head cap screw

(DIN912-8.8-Zn)

M5x25 M5x25 M6x30 M6x30 M8x35 M10x45 M12x55 M16x80

2. Fan washer

(DIN6798 A-Zn) 5,3 5,3 6,4 6,4 8,4 10,5 13 17

3. Plain washer

(DIN433-4.8-Zn) 5,3 5,3 6,4 6,4 8,4 10,5 13 17

4. Straight pin

(DIN6325) 4m6x8 4m6x8 5m6x10 5m6x10 6m6x12 8m6x16 10m6x20 12m6x24

5. Parallel key

(DIN6885 A) 6x6x50 6x6x50 8x7x60 8x7x60 10x8x60 10x8x60 10x8x80 10x8x100

Suggested

values for the

installaon:

Maximum fastening torque of the screws at the base onto steel (Nm)

5,0 5,0 8,6 8,6 21,0 40,8 71,4 190,0

Maximum fastening torque of the screws at the base onto aluminum (Nm)

5,8 5,8 9,9 9,9 24,1 40,8 82,3 164,5

Maximum fastening torque of the screws onto the ange (Nm)

0,6 1,0 1,0 1,0 2,6 8,6 -- --

Minimum installaon depth of the straight pins into the sensor (mm)

4 4 5 5 6 8 10 12

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