HBM T12 User manual

A1979-7.1 en
Digital
Torque Transducer
T12
Mounting Instructions

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Contents Page
Contents
Safety instructions 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of supply 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Operation 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Application 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Signal flow 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Structure and mode of operation 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Mechanical installation 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Conditions on site 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Mounting position 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 Installing the slotted disc (speed measuring system only) 15. . . . . .
6.4 Installing the rotor 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5 Fitting the protection against contact (option) 19. . . . . . . . . . . . . . . .
6.6 Installing the stator 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.1 Preparing with the mounting kit (included among the items
supplied) 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.2 Aligning the stator 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.3 Stator installation over the protection against contact
(option) 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.7 Optical speed/angle of rotation measuring system (option) 31. . . . .
Axial alignment 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radial alignment 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 LED status display 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Measuring mode operation 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Rotor clearance setting mode operation 34. . . . . . . . . . . . . . . . . . . . .
7.3 Speed measuring system setting mode operation 34. . . . . . . . . . . .
8 Electrical connection 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 General hints 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Shielding design 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3 Connector pin assignment 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4 Supply voltage 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4.1 Supply voltage for self‐contained operation 40. . . . . . . . . . . .
9 Shunt signal 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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10 Loading capacity 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.1 Measuring dynamic torque 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 TEDS 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.1 Content of the TEDS memory as defined in IEEE 1451.4 44. . . . . .
12 Maintenance 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.1 Cleaning the speed measuring system 50. . . . . . . . . . . . . . . . . . . . . .
13 Specifications 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14 Dimensions 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.1 Rotor dimensions 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.2 Stator dimensions 100 N⋅m ... 200 N⋅m with speed measuring
system (in mm) 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.3 Stator dimensions 100 N⋅m ... 200 N⋅m with speed measuring
system (in mm) 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.4 Stator dimensions 100 N⋅m ... 10 kN⋅m with speed measuring
system (in mm) 64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.5 Stator dimensions 100 NVm ... 200 NVm with protection against
contact (in mm) 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.6 Stator dimensions 100 NVm ... 200 NVm with protection against
contact (in mm) 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.7 Stator dimensions 500 NVm ... 1 kNVm with protection against
contact (in mm) 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.8 Stator dimensions 2 kN⋅m ... 10 kN⋅m with protection against
contact (in mm) 68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.8.1 Dimensions cover plates 100 N⋅m ... 200 kN⋅m69. . . . . . . . .
14.8.2 Dimensions cover plates 500 N⋅m ... 10 kN⋅m70. . . . . . . . . .
14.9 Mounting dimensions 70. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15 Additional technical information 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15.1 Radial and axial run‐out tolerances 71. . . . . . . . . . . . . . . . . . . . . . . . .
16 Delivery status 72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17 Order numbers 76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 Accessories 77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Safety instructions
Use in accordance with the regulations
The T12 digital torque transducer is used exclusively for torque, rotational
speed, angle of rotation and power measurement tasks and control and
adjustment tasks directly connected thereto. Use for any additional purpose
shall be deemed to be not in accordance with the regulations.
Stator operation is only permitted with an installed rotor.
In the interests of safety, the transducer should only be operated as described
in the operating manual. It is also essential to observe the appropriate legal
and safety regulations for the application concerned during use. The same
applies to the use of accessories.
Each time, before starting up the transducer, you must first run a project plan
ning and risk analysis that takes into account all the safety aspects of automa
tion technology. This particularly concerns personal and machine protection.
The transducer is not a safety element within the meaning of its use as
intended. Proper and safe operation of these transducers require proper
transportation, correct storage, assembly and mounting and careful operation.
This is a Class A product. In a domestic environment this product may cause
radio interference in which case the user may be required to take adequate
measures.
General dangers of failing to follow the safety instructions
The transducer corresponds to the state of the art and is fail‐safe. The
transducer can give rise to remaining dangers if it is inappropriately installed
and operated by untrained personnel.
Everyone involved with the installation, commissioning, maintenance or repair
of the transducer must have read and understood the operating manual and in
particular the technical safety instructions.
Remaining dangers
The scope of supply and performance of the transducer covers only a small
area of torque measurement technology. In addition, equipment planners,
installers and operators should plan, implement and respond to the safety
engineering considerations of torque measurement technology in such a way
as to minimize remaining dangers. Prevailing regulations must be complied
with at all times. Reference must be made to remaining dangers connected
with torque measurement technology.

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In this Mounting instructions remaining dangers are pointed out using the
following symbols:
Symbol: DANGER
Meaning: Maximum danger level
Warns of an imminently dangerous situation in which failure to comply with
safety requirements will result in death or serious physical injury.
Symbol: WARNING
Meaning: Potentially dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements can result in death or serious physical injury.
Symbol: CAUTION
Meaning: Dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements could result in damage to property or some form of
physical injury.
Symbols for using advices and helpful information:
Symbol: NOTE
Means that important information about the product or its handling is being
given.
Symbol:
Meaning: CE mark
The CE mark enables the manufacturer to guarantee that the product com
plies with the requirements of the relevant EC directives (the declaration of
conformity is available at http://www.hbm.com/HBMdoc).

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Symbol:
Meaning: Statutory marking requirements for waste disposal
National and local regulations regarding the protection of the environment and
recycling of raw materials require old equipment to be separated from regular
domestic waste for disposal.
For more detailed information on disposal, please contact the local authorities
or the dealer from whom you purchased the product.
Conversions and modifications
The transducer must not be modified from the design or safety engineering
point of view except with our express agreement. Any modification shall
exclude all liability on our part for any damage resulting therefrom.
Qualified personnel
The transducer must only be installed and used by qualified personnel, strictly
in accordance with the specifications and with safety requirements and
regulations. It is also essential to observe the appropriate legal and safety
regulations for the application concerned during use. The same applies to the
use of accessories.
Qualified personnel means persons entrusted with the installation, fitting,
commissioning and operation of the product who possess the appropriate
qualifications for their function.
Prevention of accidents
According to the prevailing accident prevention regulations, once the T12
digital torque transducer has been mounted, a cover or cladding has to be
fitted as follows:
•The cover or cladding must not be free to rotate.
•The cover or cladding should avoid squeezing or shearing and provide
protection against parts that might come loose.
•Covers and cladding must be positioned at a suitable distance or so
arranged that there is no access to any moving parts within.
•Covers and cladding must also be attached if the moving parts of the
torque flange are installed outside peoples' movement and operating
range.

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CAUTION
The protection against contact option, to prevent accidental contact,
must not be used as protection against bursting parts.
The only permitted exceptions to the above requirements are if the various
parts and assemblies of the machine are already fully protected by the design
of the machine or by existing safety precautions.
Warranty
In the case of complaints, a warranty can only be given if the torque
transducer is returned in the original packaging.

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1 Scope of supply
•Digital torque transducer (rotor and stator)
•T12 Mounting Instructions
•Quick Start Guide for installing the T12 Assistant control software
•T12 system CD
•Mounting kit
•Test report
•Options:
- Speed measuring system, comprising optical rotational speed sensor and
speed kit (slotted disc, screwdriver, screw locking device, screws)
- Protection against contact
- Mounted coupling
2 Operation
The supplied T12 system CD contains the "T12 Assistant" control software.
You can use this software to:
•monitor the correct installation of the torque transducer
•set the signal conditioning (zero balance, filters, scaling)
•protect your settings or load the factory settings
•display and evaluate the measured values
Notes on installing the T12 Assistant on your PC can be found in the "T12
Assistant Control Software" Quick Start Guide. (pdf file on T12 system CD
and part of the “Setup Toolkit for T12" accessory).
Notes on the operation of the T12 Assistant can be found in the program's
online Help, which is called with function key F1 or via the menu bar.
For more information about connecting to fieldbus systems, please refer to the
“T12‐CAN bus/PROFIBUS" operating manual (pdf file on T12 system CD).

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3 Application
The T12 digital torque transducer records static and dynamic torque at
stationary or rotating shafts measures rotational speed or angle of rotation,
including indication of the direction of rotation, and computes the power. It is
designed for:
•highly dynamic torque measurements when testing the performance and
functionality of engines and compound sets
•high‐resolution speed and angle of rotation measurements
•fast, dynamic performance measurements on engine and transmission test
rigs and roll test stands
Designed to work without bearings and with contactless digital signal
transmission, the torque measuring system is maintenance‐free.
The torque transducer is supplied for nominal (rated) torques of 100 N⋅m to
10 kN⋅m. Depending on the nominal torque, maximum speeds of up to
18 000 rpm are permissible.
The T12 torque transducer is reliably protected against electromagnetic inter
ference. It has been tested with regard to EMC according to the relevant
European standards, and carries the CE mark.

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4 Signal flow
Low pass LP: 0.1 Hz ... 80 Hz
Low pass LP1: 0.05 Hz ... 4000 Hz
Low pass LP2: 0.05 Hz ... 100 Hz

Fig. 4.1: Signal flow diagram
The torque and the temperature signal are already digitized in the rotor and
transmission is therefore noise‐free.
The torque signal can be zeroed , scaled (2‐point scaling) and
filtered via two low passes (LP1 and LP2). A further scaling of the frequency
output and the analog output is then possible.
NOTE
Scaling at position  (see Fig. 4.1) changes the internal calibration of
the torque transducer.
The speed signal can be filtered and also scaled for the analog output.
The angle of rotation signal, the performance signal (low pass filter LP) and
the temperature signal are only available on the fieldbusses.
The torque signal and the speed signal can be filtered via two low passes
connected in series, with the filter outputs also being available separately.
The scaled, unfiltered torque signal is used to calculate power. The resultant,
highly‐dynamically calculated power signal is filtered via a further low pass.

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For settings over 100 Hz (torque low‐pass filter 1 only), phase delay
compensation is run for the angle of rotation signal. This ensures that torque
and angle of rotation values that are measured simultaneously are also output
simultaneously.
For rotational speed and angle of rotation, two pulse series with a shift of 90°
are available as RS‐422 compatible signals.

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5 Structure and mode of operation
The torque transducer comprises two separate parts: the rotor and the stator.
Strain gages (SGs) for torque measurement have been installed on the rotor.
Carrier frequency technology (19.2 kHz carrier frequency) is used for
analyzing the SG and temperature signal. The rotor temperature is measured
at two measuring points and averaged.
The electronics for transmitting the bridge excitation voltage and the
measurement signal is located centrally in the rotor. The coils for the
noncontact transmission of excitation voltage and measurement signal are
located on the rotor's outer circumference of side A. The signals are sent and
received by a transmitter head. The transmitter head is mounted on the stator,
which houses the electronics for voltage adaptation and signal conditioning.
Connectors for inputs and outputs (for the connector pin assignment, see
chapter 8.3) are located on the stator. The transmitter head encloses the rotor
over a segment of about 120°and should be mounted concentrically around
the rotor (see chapter 6).
In the case of the speed measuring system option, the speed sensor is
mounted on the stator, the customer attaches the associated slotted disc on
the rotor. The optical speed measurement works on the infrared transmitted
light principle.
Transmitter head
Rotor
Housing
Speed sensor (option)
Side A
Side B
Stator
Slotted disc (option)
Fig. 5.1: Mechanical structure, exploded view

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6 Mechanical installation
WARNING
Handle the torque transducer carefully. The transducer might suffer
permanent damage from mechanical shock (e.g. dropping), chemical
effects (e.g. acids, solvents) or thermal effects (e.g. hot air, steam).
With alternating loads, you should glue the rotor connection screws into
the counter thread with a screw locking device (medium strength) to
exclude prestressing loss due to screw slackening.
The T12 torque transducer can be mounted directly with a relevant shaft
flange. It is also possible to directly mount a joint shaft or relevant compensat
ing element on opposite flange (using an intermediate flange when required).
Under no circumstances must the permissible limits specified for bending
moments, transverse and longitudinal forces be exceeded. Due to the torque
transducer's high torsional stiffness, dynamic changes on the shaft run are
minimized.
CAUTION
Check the effect on speeds and natural torsional oscillations critical to
bending, to prevent the transducer being overloaded by increases in
resonance.
6.1 Conditions on site
The T12 torque transducer is protected to IP54 according to EN 60529.
Protect the transducer from coarse dirt, dust, oil, solvents and moisture.
During operation, the prevailing safety regulations for the security of
personnel must be observed (see "Safety instructions").
There is wide ranging compensation for the effects of temperature on the
output‐ and zero signals of the T12 torque transducer (see specifications on
page 51). This compensation is carried out at static temperatures. This
guarantees that the circumstances can be reproduced and the properties of
the transducer can be reconstructed at any time.
If there are no static temperature ratios, for example, because of the temper
ature differences between flange A and flange B, the values given in the spe
cifications can be exceeded. Then for accurate measurements, you must

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ensure static temperature ratios by cooling or heating, depending on the
application. As an alternative, check thermal decoupling, by means of heat
radiating elements such as multiple disc couplings.
6.2 Mounting position
The transducer can be mounted in any position. With clockwise torque, the
output frequency is 10...15 kHz (Option 4, Code DF1/DU2: 60 kHz ... 90 kHz).
In conjunction with HBM amplifiers or when using the voltage output, a
positive output signal (0 V to +10 V) is present.
With counterclockwise torque, the output frequency is 5 kHz...10 kHz (Option
4, Code DF1/DU2: 30 kHz ... 60 kHz).
In the case of the speed measuring system, an arrow is attached to the head
of the sensor to clearly define the direction of rotation. When the transducer
rotates in the direction of the arrow, a positive speed signal is output.
6.3 Installing the slotted disc (speed measuring system
only)
To prevent damage to the speed measuring system's slotted disc during
transportation, it is not mounted on the rotor. Before installing the rotor in the
shaft run, the customer must attach it to the mounting ring. The mounting ring
and the associated speed sensor are already fitted at the factory.
The requisite screws, a suitable screwdriver and the screw locking device are
included in the list of components supplied.
Slotted disc
Fastening screw Mounting ring
Fig. 6.1: Installing the slotted disc

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CAUTION
When carrying out installation work, be careful not to damage the
slotted disc!
Installation sequence
1. Push the slotted disc onto the mounting ring and align the screw holes.
2. Apply some of the screw locking device to the screw thread and tighten
the screws (tightening torque < 0.15 N⋅m).
6.4 Installing the rotor
NOTE
In general, the rotor identification plate is no longer visible after
installation. This is why we include with the rotor additional stickers
with the important ratings, which you can attach to the stator or any
other relevant test‐bench components. You can then refer to them
whenever there is anything you wish to know, such as the shunt signal.
Data can also be accessed through T12 Assistent.
To explicitly assign the data, the identification number and the
measuring range are specified on the rotor where they can be seen from
outside.

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Fig. 6.2: Screw connections, flange B
1. Prior to installation, clean the plane surfaces of the transducer flange and
the counter flange. For safe torque transfer, the surfaces must be clean
and free from grease. Use a piece of cloth or paper soaked in solvent.
When cleaning, make sure that you do not damage the transmitter coils.
2. For the flange A screw connections, use hexagon‐socket screws DIN EN
ISO 4762 of property class 10.9 (measuring range 3 kN@m ... 10 kN@m:
12.9) of the appropriate length (depending on the connection geometry,
see Table 6.1).
We recommend fillister‐head screws DIN EN ISO 4762 or similar,
blackened, smoothheaded, permitted size and shape variance in
accordance with DIN ISO 4759, Part 1, product class A.
WARNING
With alternating load: Use a screw locking device (e.g. LOCTITE no. 242)
to glue the screws into the counter thread to exclude prestressing loss
due to screw slackening.
3. First tighten all the screws crosswise with 80% of the prescribed tightening
torque (Table 6.1), then tighten again crosswise, with the full tightening
torque.

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4. There are relevant tapped holes on flange A for continuing the shaft run
mounting. Again use screws of property class 10.9 (measuring range of
3 kN@m ... 10 kN@m: 12.9) and tighten them with the prescribed torque, as
specified in Table 6.1.
Fastening screw Z
Flange A
Fastening screw Z
Fig. 6.3: Screw connections, flange A
NOTE
Even if mounted correctly, the zero point adjusted at the factory may be
offset by up to 3 %. If this value has been exceeded, we recommend to
check the mounting conditions. If the remaining zero point offset is
greater than 1 % after dismounting, please send your transducer to our
factory in Darmstadt for evaluation.
CAUTION
With alternating loads, use a screw locking device to glue the
connecting screws into place. Guard against contamination from
varnish fragments.

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Measuring range
(NVm)
Fastening screws
(Z)1)
Fastening screws
Property class
Prescribed
tightening torque
(NVm)
100 / 200 M8
10.9
34
500 M10 67
1 k M10 67
2 k M12 115
3 k M12
12.9
135
5 k M14 220
10 k M16 340
Table 6.1: Fastening screws
1) DIN EN ISO 4762; black/oiled/mtot = 0.125
6.5 Fitting the protection against contact (option)
The protection against contact comprises two side parts and four covers. It is
screwed onto the stator housing.
CAUTION
Use threadlocker (e.g. LOCTITE 242) for locking all connecting screws.
1. Remove the side cover plates on the stator housing (see Fig. 6.4.)

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Cover plate
Cover plate
Fig. 6.4: Cover plates on the stator housing
2. For 500 N@m - 3 kN@m measuring ranges and retrospective protec
tion against contact orders only: The tapped holes for the stop screws
are partly covered by the attached film. Make a semicircular cutout in the
film here, at least 6 mm in radius (e.g. with a cutter, see Fig. 6.5).
Now remove the threaded pins from the tapped holes on both sides of the
stator.
Threaded pin
Fig. 6.5: Cut out the film