Interface T2 User manual

T2, T3, T4, T5, T6, T7, T12 & T15
Rotary Torque Transducers
Operation Manual
T2 Precision Rotary &
T4 General Purpose Rotary
Torque Transducers
T6 Dual Range
Rotary Torque Transducer
T3 Precision Rotary &
T5 General Purpose Rotary
Torque Transducers
T7 Dual Range
Rotary Torque Transducer T12 Square Drive Rotary Torque Transducer T15 Hex Drive Rotary Torque Transducer
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

Valid for... T2, T3, T4, T5, T6, T7, T12 & T15 Rotary Torque
Copyright © 2009 Interface, Inc.
Modification Technical changes reserved.
References in this Text
1.6 Warning Notes; Page 5
Attention must be paid to the accident prevention regulations of the trade associations.
Coverings and casings are necessary before operating the transducer. This is also valid for commissioning,
maintenance and troubleshooting.
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 on the device.
5 Mechanical Assembly; Page 10
During the assembly, the transducer must be supported to protect it from falling down.
5.1.3 Alignment of the Measurement Arrangement; Page 10
For more information please consult factory for details. [phone] | [phone] or visit
www.interfaceforce.com.
5.2 General; Page 10
Before the assembly, shafts must be cleaned with dissolver (i.e. acetone), 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 transducer or the couplings. At small
torques
(< 20 Nm) connect the transducer electrically during the assembly and observe the signal, the measurement
signal may not exceed the limit values.
5.2.1 Torque Transducers of 0.03 Nm to 15 Nm; Page 11
Transducers with nominal torques below 20 Nm are very sensitive to overload, therefore these transducers
need to be handled with greatest caution.
5.3 Free floating Assembly; Page 11
Caution: During the assembly inadmissibly large forces may not act on the transducer or the couplings.
In this installation case, double-jointed couplings cannot be used for both sides.
Risk of Breakage!
5.4 Foot Version Assembly; Page 12
6.1 Engaging; Page 13
6.4.2 Natural Resonances; Page 14
An operation of the device in natural resonance can lead to permanent damages.
Warming-up period of the torque transducer is approx. 5 min.
Caution: During the assembly inadmissibly large forces may not act on the transducer or the couplings.
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

1
1.1
1.2
1.3
1.3.1
1.3.2
1.4
1.5
1.6
2
2.1
2.2
3
3.1
3.2
3.2.1
3.2.2
3.2.3
4
4.1
4.2
4.2.1
4.2.2
4.3
4.4
4.5
4.6
4.7
5
5.1
5.1.1
5.1.2
5.1.3
5.2
5.2.1
5.2.2
5.3
5.4
5.5
6
6.1
6.2
6.3
6.4
6.4.1
6.4.2
6.5
6.6
7
7.1
7.2
8
9
9.1
9.2
10
11
11.1
11.2
11.3
Read First……………………………………………………………………………………………………………………...
Safety and Caution Symbols………………………………….……………………………………………………………..
Intended Use………………………………………………………………………………………………………………......
Dangers……………………………………………………………………………………………………………………......
Neglecting of Safety Notes………………………………………………………………………………………………......
Remaining Dangers………………………………………………………………………………………………………......
Reconstructions and Modifications…………………………..…………………………………………………………......
Personnel……………………………………………………….…………………………………………………………......
Warning Notes………………………………………………….…………………………………………………………......
Term Definitions………………………………………………..…………………………………………………………......
Terms………………………………………………………………………………………………………………………......
Definition of the Pictograms on the Torque Tranducer…….…………………………………………………………......
Product Description…………………………………………….………………………………………………………….....
Mechanical Setup…………………………………………………………………………………………………………......
Principle of Operation………………………………………….…………………………………………………………......
Electrical Setup……………………………………………………………………………………………………………......
Transducers with Analog Output……………………………..…………………………………………………………......
Transducers with RS485 Interface…………………………...…………………………………………………………......
The Serial Communication………………………………………………………………………………………………......
Electrical Connection…………………………………………..…………………………………………………………......
Pin Connection……………………………………………………………………………………………………………......
Calibration Control……………………………………………..…………………………………………………………......
Calibration Control and Analog Output…………………………………………………………………………………......
Calibration Control at RS485………………………………….………………………………………………………….....
Cable…………………………………………………………….…………………………………………………………......
Shielding Connection…………………………………………..………………………………………………………….....
Running of Measuring Cables………………………………...………………………………………………………….....
Angle/Speed (Option) ……………………………………………………………………………………………………......
Speed Only (Option) …………………………………………..…………………………………………………………......
Mechanical Assembly………………………………………….…………………………………………………………......
Couplings………………………………………………………..………………………………………………………….....
Misalignment Possibilities of Single-Jointed Couplings………………………………………………………………......
Double-Jointed Couplings……………………………………..………………………………………………………….....
Alignment of the Measurement Arrangement……………….…………………………………………………………......
General………………………………………………………….…………………………………………………………......
Torque Transducers of 0.03 Nm to 15 Nm………………….…………………………………………………………......
Torque Transducers from 20 Nm…………………………….…………………………………………………………......
Freefloating Assembly……………………………………………………………………………………………………......
Foot Version Assembly………………………………………..…………………………………………………………......
Typical Application…….……………………………………….…………………………………………………………......
Measuring……………………………………………………….…………………………………………………………......
Engaging………………………………………………………..…………………………………………………………......
Direction of Torque…………………………………………….…………………………………………………………......
Static/Quasi-Static Torques…………………………………...………………………………………………………….....
Dynamic Torques…………………………………………………………………………………………………………......
General………………………………………………………….…………………………………………………………......
Natural Resonances…………………………………………...…………………………………………………………......
Speed Limits………………………………………………………………………………………………………………......
Disturbance Variables……………………………………………………………………………………………………......
Maintenance…………………………………………………….………………………………………………………….....
Maintenance Schedule………………………………………...………………………………………………………….....
Troubleshooting………………………………………………...………………………………………………………….....
Decommssion…………………………………………………..…………………………………………………………......
Transportation and Storage…………………………………...………………………………………………………….....
Transportation…………………………………………………..………………………………………………………….....
Storage………………………………………………………….…………………………………………………………......
Disposal……………………………………………………………………………………………………………………......
Calibration…………………………………………………………………………………………………………………......
Proprietary Calibration……………………………………………………………………………………………………......
DKD-Calibration………………………………………………..…………………………………………………………......
Recalibration………………………………………………………………………………………………………………......
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4
4
4
4
4
4
5
5
5
5
5
5
6
7
8
8
8
8
8
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9
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9
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9
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10
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11
11
11
12
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CONTENTS
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

1Read First
1.1 Safety and Caution Symbols
Note:
Important points to be considered.
Caution:
Injury Risk for Persons
Damage of the Device is possible.
1.2 Intended Use
Torque transducers are intended for the measurement of torques. This measure is further suitable for control tasks. The valid
safety regulations should be absolutely respected. The torque transducers are not safety components in the sense of the
intended use. The transducers need to be transported and stored appropriately. The assembly, commissioning and
disassembling must take place professionally.
1.3 Dangers
The torque transducer is fail-safe and corresponds to the state of technology.
1.3.1 Neglecting of Safety Notes
At inappropriate use, remaining dangers can emerge (i.e. 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
transducer.
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 transducer. 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 transducers without our written approval excludes liability on our part.
1.5 Personnel
4
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

2Term Definitions
2.1 Terms
Measuring Side:
Mechanical connection of the torque transducer 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 transducer on the opposite side of the measuring side, usually with the largest moment of
inertia. At static torque transducers 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 transducer M << Mnenn.
2.2 Definition of the Pictograms on the Torque Transducer
The measuring side of the torque transducer is designated as follows:
Measuring side: or M
For more information consult factory [phone] or visit www.interfaceforce.com
3Product Description
The transducer measures static and dynamic torques. The mounting position of the torque transducer is horizontally.
Caution: It is differentiated between measuring side and driving side. Consult factory for details.
3.1 Mechanical Setup
The transducers consist of a torsion shaft. Depending on design, the mechanical connection possibilities are executable with
round shafts or feather key connections 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 transducer. For supply and measuring signal conditioning,
electronics are integrated in the stator and the rotor.
M
5
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

3.2 Principle of Operation
The supply voltage of between 12 and 28V DC is converted to AC in the stator and transferred inductively to the rotor
electronics. The voltage is rectified and stabilized and fed to the strain gage bridge. The output of the bridge is conditioned in an
amplifier and then converted to a digital signal, which is transferred to the stator by another rotating transformer. This digital
signal is much more disturbance-free than an analog signal and is highly immune to noise. This signal is further conditioned in
the stator, comes into a µ-processor and then is converted to the ±5 or ±10V output signal.
These transducers feature internal Shunt Calibration Resistors that can be switched into the bridge. A voltage of greater than
3.5V to pin K causes a control signal to be up-modulated to the supply voltage and transferred to the rotor. There, it is filtered
and evaluated by the µPC, which then activates the internal switch for the connection of the R-Cal resistor.
Initial Calibration
1. A preliminary calibration of the strain gaged shaft determines the bridge full scale output in mV/V.
2. A shunt resistor value is created to provide an output equal to the full scale output of the strain gage bridge.
3. The resistor is then hard-wired through a switch into the bridge.
4. Final assembly includes installation of the rotating shaft into the stator housing.
5. After final assembly the complete sensor is calibrated by applying known torques and adjusting the full scale output to
±5V or ±10V.
6. A calibration certificate is generated showing the transducer full scale output in Volts and the R-Cal Calibration Signal
output in both volts and units of torque.
Field R-Cal System Calibration
1. Apply between 3.5V-28V to pin K of the transducer. Pin K should be connected through a switch to either the supply
voltage or another voltage source.
2. A Calibration Signal will be generated equal to the torque value listed on the calibration certificate. The Customer’s
data acquisition system can then be scaled using this signal.
6
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

DC/DC Oscillator
4MHz
Signal
Conditioning
Signal Adaption
Analog/Digital
Signal
Conditioning
A/D-Converter
±11 or ±15 bit
µ-Processor
µ-Processor
Rotation Angle (Option)
Supply
voltage
Calibration
Control
Signal
Output
Channel 1
Rotation
Al
A
ngle Output
(Option)
Amplifie
r
Stator Rotor
R
otating Transformer
Serial Data Transmission
A
B
Filter for
Control Signal
Cycle and
Control Signal
Supply and
Control Signal
Rotating Transformer
Signal Adaption
Analog/Digital
Signal
Output
Channel 2
(Option)
A
C
DC
S
GSG
A/D-Converter
±15 bit
A
mplifie
r
2
1
Dual Range
Transducers Onl
y
R-Cal
Resistor
Electrical Setup
Block diagram for serial signal transmission
7
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

3.2.1 Transducers with Analog Output
At this output, the digital signal is converted into DC voltage of ±5V or ±10V, proportional to the torque and is available at the
connector output.
3.2.2 Transducers with RS485 Interface
The torque transducer has a digital interface RS485 for the signal output and automatic transducer identification.
The protocol enables high dynamics.
For more information consult factory [phone] or visit www.interfaceforce.com.
3.2.3 The Serial Communication
Consult factory [phone] or visit www.interfaceforce.com.
4Electrical Connection
4.1 Pin Connection
8
Also see test certificate.
8-pin Analog
1 Excitation + 12 ... 28 VDC
2 Excitation GND 0V
3 Signal ±5V / (±10V)
4 Signal GND 0V
5 Calibration control L<2.0V;
H>3.5V
6 Option angle A TTL For color code of black molded one-piece cable assembly please consult
factory.
7 Option angle B TTL
8 NC View: socket on soldering side
12-pin Analog Digital
A NC NC
B Option angle B TTL Option angle B TTL
C Signal ±5V / (±10V) NC
D Signal GND 0V NC
E Excitation GND 0V Excitation GND 0V
F Excitation + 12 ... 28 VDC Excitation + 12 ... 28 VDC
G Option angle A TTL Option angle A TTL
H* Signal 2 ±5V (±10V) NC
J NC Output B RS485
K Calibration control L<2.0V; H>3.5V NC
L NC Output A RS485
M Housing Housing
*Dual Range Sensors only
4.2 Calibration Control
Only use calibration control in unloaded condition of the torque transducer. Cal control output is approximately equal to
transducer full scale output. Exact value is noted on calibration certificate.
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

4.1.1 Calibration Control at Analog Output
Applying voltage of between +3.5V to +28V switches the calibration control on. Voltage below +2.0V switches it off.
3.5V < Ucal < 28V
U
c
a
l
EXC. (+)
CAL
CONTROL
EXC. (-)
OR
CAL
CONTROL
4.1.2 Calibration Control at RS485
The calibration control switch on is carried out by a command.
For more information consult factory [phone] or visit www.interfaceforce.com.
4.2 Cable
Use only shielded cable with the shortest length possible. We recommend Interface brand cables as they are tested together with our
transducers.
4.3 Shielding Connection
In combination with the transducer and the external electronics, the shield forms a Faraday Cage. By this, electro-magnetic
disturbances do not have any influence on the measurement signal.
4.4 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 running the cable in a grounded steel conduit.
4.5 Angle/Speed (Option)
360 pulse/revolution, 2-track, +5V TTL. The second track can be used to
quadruple the number of pulses/revolution, or to determine rotation direction.
Not available on transducers above 1,000 Nm.
4.6 Speed Only (Option)
60 pulse/revolution, single track, +5V TTL. Available on transducers above
1,000 Nm only.
4.7 Speed Only (Option)
60 pulse/revolution, single track, +5V TTL. Available on transducers above
1,000 Nm only.
9
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com

5Mechanical Assembly
For the assembly of a torque transducer in a shaft line, we always recommend to use couplings, which can be misaligned.
During the assembly, the transducer must be supported to protect if from falling down.
5.1 Couplings
We recommend multi-disc couplings for our torque transducers. Couplings must be able to balance an axial, radial or angular
offset of the shafts and not allow large forces to act on the transducer. The assembly instructions of the respective coupling
manufacturer must be considered.
5.1.1 Misalignment Possibilities of Single-Jointed Couplings
10
Angular misalignments Axial misalignments
Note: Radial misalignments are only possible in the combination of
single-jointed coupling - torque transducer (as adapter) - single-jointed coupling.
Thus, with both single-jointed couplings the torque transducer forms a double-jointed coupling.
Radial misalignments
5.1.2 Double-Jointed Couplings
Double-jointed couplings are used for the balance of inevitable angular, axial and radial misalignments.
5.1.3 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.
5.2 General
Before the assembly, shafts must be cleaned with dissolver (i.e. acetone); no foreign particles may adhere to them.
The hub must fit corresponding to the connection.
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 transducer or the couplings. At small
torques (< 20 Nm) connect the transducer electrically during the assembly and observe the signal, the
measurement signal may not exceed the limit values.
7401 East Butherus Drive • Scottsdale, Arizona 85260 • 480.948.5555 • www.interfaceforce.com