Lorenz DR-1986 Manuale utente

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 1 of 12

Operation Manual

for Torque Sensors

For below and similar Types

DR-1986

DR-1987

DR-1988

DR-2124

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 2 of 12

Imprint

Manufacturer, Place

Lorenz Messtechnik GmbH, D-73553 Alfdorf.

Valid for...

DR-1986; DR-1987; DR-1988; DR-2124

Reprint Interdiction

Reprints, even in extracts, only with written authority.

Modification

Technical changes reserved.

References in this Text

1.6 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.

4 Mechanical Assembly; Page 7

It must be ensured that no materials (e.g. liquids, gases) from other components of the spindle get

into the torque sensor.

Before the assembly, spline drive (or square drive) must be cleaned with dissolver (e.g. acetone)

and lightly greased, no foreign particles may adhere to them. The hub must fit corresponding to the

connection.

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

connections. At small torques (< 50 N·m) connect the sensor electrically during the assembly and

observe the signal, the measurement signal may not exceed the limit values.

6 Measuring; Page 9

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

6.4.1 Natural Resonances; Page 10

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

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 3 of 12

Contents

1Read First.............................................................................................................................................. 4

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

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

1.3 Dangers.......................................................................................................................................... 4

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

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

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

1.5 Personnel ....................................................................................................................................... 4

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

2Term Definitions .................................................................................................................................... 5

2.1 Terms ............................................................................................................................................. 5

3Product Description ............................................................................................................................... 5

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

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

3.2.1 Sensors with Analog Output ................................................................................................... 6

4Mechanical Assembly............................................................................................................................ 7

5Electrical Connection............................................................................................................................. 8

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

5.1.1 Standard Version .................................................................................................................... 8

5.2 Calibration Control ......................................................................................................................... 8

5.2.1 Calibration Control at Analog Output ...................................................................................... 8

5.3 Cable.............................................................................................................................................. 8

5.4 Shielding Connection ..................................................................................................................... 9

5.5 Running of Measuring Cables........................................................................................................ 9

5.6Angle (Option) ................................................................................................................................ 9

6Measuring.............................................................................................................................................. 9

6.1 Engaging ........................................................................................................................................ 9

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

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

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

6.4.1 Natural Resonances ............................................................................................................. 10

6.5 Speed Limits ................................................................................................................................ 10

6.6 Disturbance Variables .................................................................................................................. 10

7Maintenance........................................................................................................................................ 10

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

7.2 Trouble Shooting.......................................................................................................................... 11

8Decommission..................................................................................................................................... 11

9Transportation and Storage ................................................................................................................ 11

9.1 Transportation .............................................................................................................................. 11

9.2 Storage......................................................................................................................................... 11

10 Disposal ........................................................................................................................................... 12

11 Calibration........................................................................................................................................ 12

11.1 Proprietary Calibration.............................................................................................................. 12

11.2 DKD-Calibration........................................................................................................................ 12

11.3 Re-Calibration........................................................................................................................... 12

12 Data Sheet....................................................................................................................................... 12

13 Literature.......................................................................................................................................... 12

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 4 of 12

1 Read First

1.1 Safety and Caution Symbols

Caution:

Injury Risk for Persons

Damage of the Device is possible.

Note:

Important points to be considered.

1.2 Intended Use

Torque sensors are intended for the measurement of torques. This measurand is further suitable for

control tasks. 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.

1.3 Dangers

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

1.3.1 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.

1.3.2 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.

1.4 Reconstructions and Modifications

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

1.5 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.

1.6 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

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.

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 5 of 12

2 Term Definitions

2.1 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.

3 Product Description

The sensor measures following static and dynamic measurements:

Torque

Speed

Angle

The installation position of the torque sensor can be chosen freely.

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

http://www.lorenz-sensors.com

3.1 Mechanical Setup

The sensors consist of a torsion shaft. Depending on design, the mechanical connection possibilities are

executable with spline drive or square drive etc. 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.

Schematical Drawing of the Mechanical Setup

Rotating transformer

Shaft

Measuring side

Drive side

Electronics in the stator

Angle Sensor

Electronics in the rotor

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 6 of 12

3.2 Electrical Setup

The supply of the rotor electronics occurs by an alternating voltage, generated in the stator, which

transfers to the rotor through a rotating transformer. There, it is rectified and stabilized. With this supply,

the strain gauge bridge is fed.

For the electrical calibration control of the sensor, a control signal is up-modulated to the supply by the µ-

processor in the stator and transferred to the rotor. There, it is filtered and evaluated by the µPC, which

also activates the internal switch for the detuning of the strain gauge bridge.

The measuring signal of the strain gauge bridge is conditioned in an amplifier and then converted into a

digital signal, which will be transferred to the stator by another rotating transformer. Compared to the

analog signal, the measuring signal in digital form is much more disturbance-free. The remaining distance

of the measuring signal within the sensor occurs in digital form, completely. Thus, the measuring system

achieves a high reliability of operation.

This signal is further conditioned in the stator, comes into a µ-processor, then - depending upon sensor

type - it is converted to a voltage signal, digital signal or to current and will then reach the output of the

sensor and can be directly measured at the connector.

Oscillator

MHz

Signal

Conditioning

Signal Adaption

Analog or Digital

Signal

Conditioning

A/D-Converter

bit

Processor

Rotation Angle (Option)

Supply

Voltage

Calibration

Control

Signal

Output

Rotation

Angle Output

(

Option

)

Amplifier

Stator

Rotor

Rotating Transformer

Serial Data Transmission

Filter for

Control Signal

Cycle and

Control Signal

Supply and

Control Signal

Rotating Transformer

Block Diagram for Serial Signal Transmission

3.2.1 Sensors with Analog Output

At this output, the digital signal is converted into DC voltage of ±5 V (option ±10 V), proportionally to the

torque and is available at the connector output.

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 7 of 12

4 Mechanical Assembly

Installation Instructions:

It must be ensured that no materials (e.g. liquids, gases) from other components of the

spindle get into the torque sensor.

Before the assembly, spline drive (or square drive) must be cleaned with dissolver (e.g.

acetone) and lightly greased, no foreign particles may adhere to them. The hub must fit

corresponding to the connection.

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

mechanical connections. At small torques (< 50 N·m) connect the sensor electrically

during the assembly and observe the signal, the measurement signal may not exceed the

limit values.

Type DR-1986

The shaft of the torque sensor is designed with an inner and external square connector. The shaft is used

to transmit torque to the screwdriver.

The mechanical connection to the spindle housing occurs via a screw connection.

Type DR-1987 and DR-1988

The shaft of the torque sensor is designed with an inner and external square connector. The shaft is used

to transmit torque to the screwdriver.

The mechanical connection to the spindle housing occurs via a tooth system and a union nut.

Type DR-2124

The shaft of the torque sensor is designed with a splined shaft and tooth hub connection. The shaft is

used to transmit torque to the screwdriver.

The mechanical connection to the spindle housing occurs via a tooth system and a union nut.

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 8 of 12

Excitation GND

Calibration control

5 Electrical Connection

5.1 Pin Connection

The torque sensors are equipped with a 12-pin connector (Binder miniature circular connectors series

680, 12-pin)

5.1.1 Standard Version

Also see data sheet

12-pin

Angle B

TTL

Signal

±5 V / (±10 V)

Signal GND

0 V

Excitation GND

0 V

Excitation +

12 ... 28 VDC

Angle A

TTL

Calibration control

L<2,0 V; H>3,5 V

Housing

5.2 Calibration Control

Only use calibration control in unloaded condition of the torque sensor.

5.2.1 Calibration Control at Analog Output

By applying voltage of +5 V to +28 V the calibration control will

switch on.

Voltage below 2,8 V will switch off the calibration control.

5.3 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.

Ukal

Exc. GND

Cal. control

3,5 VDC < Ukal < 28 VDC

View: Socket on Soldering Side

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 9 of 12

5.4 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.

5.5 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.

5.6 Angle (Option)

At angle or speed measurement, the pulses / revolutions

are acquired. By a second transmitter trace, displaced by

90° and flank evaluation, the pulses / revolutions can be

quadrupled. The trace, displaced by 90°, can also be

used for the rotational direction detection.

See corresponding data sheet for the output levels.

Supply for angle sensor

Stabilized supply voltage

5 V ±25 mV

Current consumption max.

20 mA

6 Measuring

6.1 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.

6.2 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 Lorenz Messtechnik GmbH can measure both, clockwise and counter-clockwise

direction.

6.3 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.

6.4 Dynamic Torques

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.

LORENZ MESSTECHNIK GmbH

Obere Schloßstr.131

73553 Alfdorf

07172 / 93730-0

Fax 07172 /93730-22

E-Mail: info@lorenz-sensors.com

Technical changes reserved

090327.docx

Internet: www.lorenz-sensors.com

Page 10 of 12

6.4.1 Natural Resonances

Estimate of the mechanical natural frequencies:



















J1, J2

= Natural Frequency in Hz

= Moment of Inertia in kg*m²

= Torsional Rigidity in Nm/rad

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.

6.5 Speed Limits

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

6.6 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.

7 Maintenance

7.1 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 Lorenz

Messtechnik GmbH

20000 hrs

operating time

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