Omega Products TQ 505 Installation Manual
Operating instructions
Torque transducer type AE
with replaceable strain gauge measuring element
Model TQ 505
Operating instructions no. 1079
Torque Transducer TQ 505
Page 1 / 16
1. Contents
1. List of contents.....................................................................................................page 2
2. Application and typical features....................................................................................... 3
3. Description of the measuring system............................................................................... 4
3.1 Mechanical design ......................................................................................................4
3.2 Electrical design.......................................................................................................... 5
3.2.1 Electrical design of speed measurement.................................................................... 6
4. Electrical connection of the torque transducer................................................................. 7
4.1 Power supply............................................................................................................... 7
4.2 Connection assignment for torque transducers.......................................................... 8
4.3 Connection assignment for speed pick-up ................................................................. 9
4.4 Installing the measuring cable .................................................................................... 9
5. Mechanical assembly of the torque transducer ............................................................... 10
6. Calibration of the transducer............................................................................................13
6.1 Zero point adjustment ................................................................................................. 13
6.2 Gain adjustment..........................................................................................................13
6.3 Mechanical calibration ................................................................................................ 14
6.3.1 Construction of a simple calibration device ................................................................ 14
6.3.2 Example for the calculation of lever arm length.......................................................... 15
6.4 Electrical calibration.................................................................................................... 15
7. Maintenance..................................................................................................................... 16
8. Repairing the measuring shaft......................................................................................... 16
For technical specifications please refer to the data sheet.
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2. Application and typical features
l Torque transducer with strain gauge measuring element
l Frequency-modulated transmission of the measuring signal
l Measuring of static and dynamic torque signals
l Torque measurement on rotating shafts
l Laboratory use, manufacture and quality control
l Transducer for precision measurements
l With speed measurement as an option
l Measuring elements are exchangeable
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3. Description of the measuring system
3.1 Mechanical design
The transducer consists of a base body with a foot and replaceable measuring elements. These are
connected to the base body by means of 4 screws. The torque is transmitted via two claws. In the
center of these claws, plug contacts for transmitting the measured values are arranged. The measuring
element consists of a torque rod equipped with strain gauges. The measuring element flange holds a
calibration switch used for the gain adjustment required after a measuring element change.
(Please also refer to the illustration below.)
The base body houses the required electronics. One part of the electronics is located in the rotating
shaft, the other in the terminal box. The coils required to transmit the measured values from the rotating
to the stationary part are also housed in the base body.
cable connection
base body
fixing screws for
measuring element
terminal box
with electronics
speed sensor
(option)
calibration
switch
replaceable
measuring element
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3.2 Electrical design
Brief description
The figure below shows the functional principles used here for frequency-modulated signal
transmission.
The supply voltage for the electronics is 24 V AC. A rotary transformer is used to transmit the AC
excitation voltage. This voltage is rectified and stabilized.
The output signal of the strain gauge bridge is preamplified and fed to a voltage/frequency converter.
This converter gives a corresponding AC output voltage.
The output signal is transmitted by a second transformer to the nonrotating part of the transducer. The
transformers themselves are a pair of concentrically wound coils with one coil rotating within or beside
the stationary coil. The magnetic flux lines are produced by applying a time-varying voltage to one of
these coils. The transmitted frequency-modulated signal passes across a Schmitt trigger and a
frequency/voltage converter.
This voltage is applied to the input of a amplifier which gives an analog output of ± 10 V according to
the direction of rotation (10 V at nominal torque).
fine stabilisation
meas. cable
plug housing
rectification and
stabilisation
zero point
gain
frequency / voltage
converter
rotating
measuring
shaft
pulses
former
transducer
for supply voltage
rectification and
stabilisation
voltage / frequency
converter
fine stabilisation
pre-amplifier
strain gauge
bridge
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