Interface T8 Manuale utente

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 1 of 11

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 2 of 11

Imprint

Valid for... Torque sensor type T8

Reprint Interdiction Reprints, even in extracts, only with written authority.

Modification Technical changes reserved.

References in this Text

Warning Notes, Page 4

Attention must be paid to the accident prevention regulations of the trade associations. Coverings

and casings are necessary before operating the sensor. This is also valid for commissioning,

maintenance and trouble shooting.

Duties of the coverings and casings are:

฀ Protection from detaching parts

฀ Protection from contusion and shear

฀ Prevention from reaching rotating parts

฀ Prevention from being tangled up and/or getting caught by parts Coverings may

฀ Not grind

฀ Not rotate

Coverings are also necessary outside of operating and motion travel areas of persons. These

demands can be modified if other sufficient safety devices are available. During operation, the

safety precautions must be operative. By vibrations, damages can occur at the device.

Alignment of the Measurement Arrangement

For further references see coupling manual.

General

Before the assembly, shafts must be cleaned with dissolver (e.g. acetone); no foreign

particles may adhere to them. The hub must fit corresponding to the connection.

During the assembly, the sensor must be supported to protect it from falling down.

Caution: During the assembly inadmissibly large forces may not act on the sensor or the

couplings.

Torque Sensors below 20 N.m

Sensors with nominal torques below 20 N·m are very sensitive to overload, therefore these

sensors need to be handled with greatest caution.

Free-floating Assembly

In this installation case, double-jointed couplings cannot be used for both sides!

Risk of Breakage!

Engaging

Warming-up period of the torque sensor is approx. 5 min.

Natural Resonances

An operation of the device in natural resonance can lead to permanent damages.

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 3 of 11

Contents

Table of Contents

Imprint .............................................................................................................................................................................. 2

Contents............................................................................................................................................................................ 3

Read First........................................................................................................................................................... 4

Safety and Caution Symbols...................................................................................................................................... 4

Intended Use............................................................................................................................................................. 4

Dangers

Neglecting of Safety Notes........................................................................................................................................ 4

Remaining Dangers ................................................................................................................................................... 4

Reconstructions and Modifications .......................................................................................................................... 4

Personnel .................................................................................................................................................................. 4

Warning Notes .......................................................................................................................................................... 4

Term Definitions ................................................................................................................................................ 5

Terms

Definition of the Pictograms on the Torque Sensor.................................................................................................. 5

Product Description .......................................................................................................................................... 5

Mechanical Setup...................................................................................................................................................... 5

Electrical Setup.......................................................................................................................................................... 6

Mechanical Assembly ........................................................................................................................................ 6

Couplings

Misalignment Possibilities of Single-Jointed Couplings............................................................................................. 6

Double-Jointed Couplings ......................................................................................................................................... 6

Alignment of the Measurement Arrangement ......................................................................................................... 6

General

Torque Sensors below 20 N·m.................................................................................................................................. 7

Torque Sensors from 20 N·m and above .................................................................................................................. 7

Free-floating Assembly.............................................................................................................................................. 7

Foot Version Assembly.............................................................................................................................................. 8

Electrical Connection......................................................................................................................................... 8

Pin Connection .......................................................................................................................................................... 8

Cable

Shielding Connection ................................................................................................................................................ 8

Running of Measuring Cables ................................................................................................................................... 8

Measuring ......................................................................................................................................................... 9

Engaging

Direction of Torque ................................................................................................................................................... 9

Static / Quasi-Static Torques..................................................................................................................................... 9

Dynamic Torques ...................................................................................................................................................... 9

General

Natural Resonances .................................................................................................................................................. 9

Speed Limits .............................................................................................................................................................. 9

Disturbance Variables ............................................................................................................................................... 9

Maintenance ................................................................................................................................................... 10

Maintenance Schedule............................................................................................................................................ 10

Trouble Shooting..................................................................................................................................................... 10

Decommission................................................................................................................................................. 10

Transportation and Storage ............................................................................................................................ 10

Transportation ........................................................................................................................................................ 11

Storage

Disposal ........................................................................................................................................................... 11

Calibration ....................................................................................................................................................... 11

Proprietary Calibration............................................................................................................................................ 11

DKD-Calibration....................................................................................................................................................... 11

Re-Calibration ......................................................................................................................................................... 11

Data Sheet ....................................................................................................................................................... 11

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 4 of 11

Read First

Safety and Caution Symbols

Caution:

Injury Risk for Persons

Damage of the Device is possible.

Note:

Important points to be considered.

Intended Use

Torque sensors are intended for the measurement of torques. 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.

Dangers

The torque sensor is fail-safe and corresponds to the state of technology.

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.

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

technique must be pointed out.

Human mistakes must be considered. The construction of the plant must be suitable for the avoidance of dangers. A

danger-analysis for the plant must be carried out.

Reconstructions and Modifications

Each modification of the sensors without our written approval excludes liability on our part.

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.

Warning Notes

Attention must be paid to the accident prevention regulations of the trade associations. Coverings

and casings are necessary before operating the sensor. This is also valid for commissioning,

maintenance and trouble shooting.

Duties of the coverings and casings are:

•Protection from detaching parts

•Protection from contusion and shear

•Prevention from reaching rotating parts

•Prevention from being tangled up and/or getting caught by parts

Coverings may:

oNot grind

oNot rotate

Coverings are also necessary outside of operating and motion travel areas of persons. These

demands can be modified if other sufficient safety devices are available. During operation, the

safety precautions must be operative. By vibrations, damages can occur at the device.

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 5 of 11

Term Definitions

Terms

Measuring Side:

Mechanical connection of the torque sensor in which the torque to be measured is applied. Usually this side has

the smallest moment of inertia.

Drive Side:

Mechanical connection of the torque sensor on the opposite side of the measuring side, usually with the largest

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 << Mnenn .

Definition of the Pictograms on the Torque Sensor

The measuring side of the torque sensor is designated as follows:

Measuring side: or M

More information can be found on the data sheet, if needed.

Product Description

The sensor measures static and dynamic torques. The mounting position of the torque sensor is

horizontally.

Caution: it is to be differentiated between measuring side and drive side, see data sheet of the sensor:

http://www.Interfaceforce.com

Mechanical Setup

The sensors consist of a torsion shaft with free round shaft ends. The torsion shaft, applied with two strain gauge

full bridges, is bedded in a housing through ball bearings. For the signal transmission and/or the supply of the

strain gauge full bridges, a rotating transformer, according to the principle of a transformer, is arranged in the

sensor. For supply and measuring signal conditioning, electronics are integrated in the stator and the rotor.

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 6 of 11

Electrical Setup

The electronics integrated in the sensor consists of two parts. The

first part is in the stator and has following tasks:

Stabilization of the supply voltage

Electric supply of the rotor electronics through the rotating transformer

Preparation of the measurement signal from the rotor

Readout of the torque measurement signal to the cable connection

The second part of the electronics is placed in the rotor of the torque sensor and

has following functions:

Supply of the SG full bridge with d.c. voltage Preparation of

the electrical torque measurement signal Transmission of

the measurement signal to the stator

Mechanical Assembly

For the assembly of a torque sensor in a shaft line, we always recommend to use couplings which can be misaligned.

Couplings

We recommend multi-disc couplings for our torque sensors. Couplings must be able to balance an axial, radial or

angular offset of the shafts and not allow large forces to act on the sensor. The assembly instructions of the

respective coupling manufacturer must be considered.

Misalignment Possibilities of Single-Jointed Couplings

Angular Misalignments Axial Misalignments

Note: Radial misalignments are only possible in the combination of

single-jointed coupling - torque sensor (as adapter) - single-jointed coupling.

Thus, with both single-jointed couplings the torque sensor forms a double-jointed coupling.

Radial Misalignments

Double-Jointed Couplings

Double-jointed couplings are used for the balance of inevitable angular, axial and radial misalignments.

Alignment of the Measurement Arrangement

Precisely alignment of the couplings reduces the reaction forces and increases the durability of the couplings.

Disturbance variables are minimized as well.

Due to the multitude of applications, an alignment of the coupling with a straight edge in two levels, vertical

to each other, is sufficient.

However, in drives with high speed an alignment of the coupling (shaft ends) with a dial gauge or a laser is

recommended.

For further references see coupling manual.

General

Before the assembly, shafts must be cleaned with dissolver (e.g. acetone), no foreign

particles may adhere to them. The hub must fit corresponding to the connection.

During the assembly, the sensor must be supported to protect it from falling down.

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 7 of 11

Connections with Clamping Piece:

The indications of the clamping piece manufacturer must be considered. The clamping piece must be able to

transfer the arising torques safely.

Caution: During the assembly inadmissibly large forces may not act on the sensor or the 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

Torque Sensors below 20 N·m

Sensors with nominal torques below 20 N·m are very sensitive to overload, therefore these

sensors need to be handled with greatest caution.

1. Connect the sensor electrically during the assembly and observe the measuring signal; the limit values

may not be exceeded in any case.

2. Align the arrangement before the parts are connected firmly.

3. Assemble 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 cannot act on the

torque sensor.

Torque Sensors from 20 N·m and above

The hub must fit corresponding to the connection.

Free-floating Assembly

The sensor is installed between two single-jointed couplings and contributes to the balance of an

inevitable axis offset between the two mechanical connections.

If no couplings are used, very large transverse forces can affect the sensor. In addition, large forces occur on the

bearings, in drive and output, which limit their life span very strongly.

Shafts must be cleaned with solvent (e.g. acetone) before the assembly. No foreign particles may adhere to them.

Shift couplings on shafts (use entire clamping length of the coupling) and align shafts. Absolutely assure that the

data of the couplings (axis offset, angular offset, tension, compression) are not exceeded.

The housing must be protected from twisting e.g. by a flexible connection. The cable connection may not be used

for this.

The cable connection must be placed loosely (form of goose neck), so that it can follow the light

movements of the stator.

Torque sensor

Drive Single-jointed coupling Single-jointed coupling Output

Flexible connection for

housing fixation

Cable connection

In this case, with both single-jointed couplings, the torque sensor forms a double-jointed coupling. A

single-jointed coupling can only balance axial and angular misalignments.

In this installation case, double-jointed couplings cannot be used for both sides!

Risk of Breakage!

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 8 of 11

Drive

Double-jointed coupling

Output

Foot Version Assembly

The sensor can be installed as a bearing block. A double-jointed coupling must be mounted on each shaft end. By

this, inevitable axis offsets, which can also appear during the period of operation, are being balanced. If no

couplings are used, very large transverse forces can occur in the bearings of the sensor as well as in the bearings on

drive and output which will limit their life span very strongly. Further, large bending moments will emerge in the

shaft.

At small torques (< 20 N·m) connect the sensor electrically and observe the signal; the measurement signal

may not exceed the limit values...

Shafts must be cleaned with solvent (e.g. acetone) before the assembly. No foreign particles may adhere to them.

Shift couplings on shafts (use entire clamping length of the coupling) and align shafts. Absolutely assure that the

data of the couplings (axis offset, angular offset, tension, compression) are not exceeded.

Torque sensor

Electrical Connection

Pin Connection

Also see test certificate.

The firmly connected cable has free ends

Green Excitation GND 0 V

Brown Excitation + 12 ... 28 VDC

Yellow Signal ±5 V / (±10 V)

White Signal GND 0 V

Netting Shield

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.

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.

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.

T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 9 of 11

Measuring

Engaging

The warming-up period of the torque sensor is approx. 5 min. Afterwards the measurement can be started.

The warming-up period of the torque sensor is approx. 5 min.

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 Interface can measure both, clockwise and counter-clockwise direction.

Static / Quasi-Static Torques

Static 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.

Dynamic Torques

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 of alternating torque must be limited to 70 % of the nominal torque.

Natural Resonances

Estimate of the mechanical natural frequencies: c

f0 ฀1

฀

2 ฀

฀

J1, J2

= Natural Frequency in Hz

= Moment of Inertia in kg*m² J2

= Torsional Rigidity in Nm/rad J1

Further methods for the calculation of natural resonances are corresponding purchasable programs or books

(e.g. Holzer-Procedure, Dubbel, Taschenbuch für den Maschinenbau, Springer Verlag)

An operation of the device in natural resonance can lead to permanent damages.

Speed Limits

The maximum speed indicated in the data sheet may not be exceeded in any operating state...

Disturbance Variables

By disturbances, measured value falsifications can occur by

•Vibrations,

•Temperature gradients,

•Temperature changes,

•Arising disturbance variables during operation, e.g. imbalance,

•Electrical disturbances,

•Magnetic disturbances,

•EMC (electromagnetic disturbances),

Therefore avoid these disturbance variables by decoupling of vibrations, covers, etc.

⋅

1 +

1 





2 



T8 Torque Sensor Operation Manual

Interface Inc. ● 7401 East Butherus Drive, Scottsdale, Arizona 85260 USA ● Phone 480.948.5555 ● Fax 480.948.1924

www.interfaceforce.com ● Email: contact@interfaceforce.com ● 800.947.5598

Page 10 of 11

Maintenance

Maintenance Schedule

Action

Frequency

Date

Control of cables and connectors

1x p.a.

Calibration

< 26 months

Control of fixation (flanges, shafts)

1x p.a.

Have bearings exchanged by Interface

20000 hrs

operating time

Trouble Shooting

This chart is used for searching for the most frequent errors and their elimination

Problem Possible Cause Trouble Shooting

No signal

No sensor excitation

•Outside of permissible range

•Connect excitation

•Cable defect

•No mains supply

Signal output connected wrong

•Connect output correctly

•Evaluation electronics defect

Sensor does not react to torque

Shaft not clamped

•Clamp correctly

No power supply

•Outside of permissible range

•Connect supply

•Cable defect

•No mains supply

Cable defect

•Repair cable

Connector connected wrong

•Connect correctly

Signal has dropouts

Axial position rotor to stator

outside of tolerance

•Align rotor

Cable defect

•Repair cable

Zero point outside of tolerance

Cable defect

•Repair cable

Shaft mounted distorted

•Mount correctly

Distorted shaft string

•Release from distortion

Strong lateral forces

•Reduce lateral forces

Distorted flanges

•Check evenness of flange-

surfaces

Shaft overloaded

•Send to manufacturer

Wrong torque indication

Calibration not correct

•Re-calibrate

Sensor defect

•Repair by manufacturer

Torque shunt

•Eliminate shunt

Oscillations

Alignment of shaft not correct

•Align correctly

Unbalance

•Balance the corresponding

parts

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.

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 so that no packing material can reach into the sensor (ball

bearings). Larger sensors should be packed in cases.

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