HBM T20WN User manual

Torque transducers
T20WN
Terminal box
VK20
Mounting Instructions
B 23.T20WN.30 en
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3
T20WN
HBM 10.05.2001
Contents Page. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Application 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Installation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Installation position 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Installation options 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Couplings 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1 Installation position with couplings 8. . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.2 Installation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Electrical connection 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Connector 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Cable extension 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Shielding design 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Load-carryingcapacity 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Measuring dynamic torque 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Maximum rotation speed 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Displaying torque and direction of rotation 13. . . . . . . . . . . . . . . . .
6 Maintenance 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Dimensions 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Specifications 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Accessories 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1 VK20 terminal box 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1.1 Mechanical connection of the connector cables 20. . . . . . . . . . . . . . . .
9.1.2 Electrical connection T20WN (St1 and St2) 22. . . . . . . . . . . . . . . . . . .
9.1.3 Electrical connection of the voltage supply (St7) 22. . . . . . . . . . . . . . .
9.1.4 Electrical connection output torque (Md) 23. . . . . . . . . . . . . . . . . . . . . .
9.1.5 Electrical connection output speed/angle of rotation (n/) 23. . . . . . . .
9.1.6 Functional check 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1.7 Calibration signal 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1.8 Dimensions VK20 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1.9 Specifications VK20 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.2 Connection cable for evaluation electronics 27. . . . . . . . . . . . . . . . . . .
9.3 Bellows-type couplings 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.3.1 Dimensions for the bellows-type couplings 28. . . . . . . . . . . . . . . . . . . .
9.3.2 Specifications for bellows-type couplings 29. . . . . . . . . . . . . . . . . . . . .
10 Declarations of conformity 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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4T20WN
HBM 10.05.2001
Safety instructions
Use in accordance with the regulations
Torque transducers T20WN are used exclusively for torque and rotation speed
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.
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.
The transducer is not a safety element within the meaning of its use as
intended. Proper and safe operation of this transducer requires proper
transportation, correct storage, assembly and mounting and careful operation.
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 technique. In addition, equipment planners,
installers and operators should plan, implement and respond to the safety
engineering considerations of torque measurement technique in such a way as
to minimise 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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T20WN
HBM 10.05.2001
In this Operating Manual 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: Dangerous situation
Warns of a potentiallydangerous situation in which failure to comply with
safety requirements can result in death or serious physical injury.
Symbol: CAUTION
Meaning: Potentially 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.
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 complies
with the requirements of the relevant EC directives (see Declaration of
conformity at the end of this operating manual).
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6T20WN
HBM 10.05.2001
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 to 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.
WARNING
In accordance with the health and safety regulations relevant to accident
prevention, once the operator has fitted the torque transducers, a cover or
cladding must be attached as follows:
•The cover or cladding must not be free to rotate.
•The cover or cladding must prevent access to any areas where crushing or
shearing could occur, and must provide protection against any parts that
may come loose.
•Covers and cladding must be positioned at a suitable distance or so
arranged that it prevents access to any moving parts within.
•Covers and cladding must also be attached if the moving parts of the torque
transducers are installed outside the area in which people are moving about
and working.
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.
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7
T20WN
HBM 10.05.2001
1 Application
Torque transducers T20WN measure static and dynamic torque and rotation
speeds or angles of rotation for turning or static machine parts in any direction
of rotation. They are designed for small to medium-sized torque, such as that
measured on performance or function test benches for domestic or business
machines.
2 Installation
2.1 Installation position
Any installation position can be chosen for torque transducers (see
Chapter 2.3.1).
2.2 Installation options
CAUTION
The permissible load limits given in the specifications (see Page 15) are
mandatory.
ÈÈ
ÈÈ
ÈÈ
ÈÈÈÈÈÈÈÈÈ
È
ÈÈÈÈÈÈÈ
È
ÈÈÈÈÈÈÈÈÈ
ÈÈ
ÈÈ
ÈÈÈ
ÈÈÈ
F
Base mounting
between two full
couplings1)
Front mounting,
full coupling on the
right 2)–belt drive on the
left
Fig. 2.1: Installation options with couplings
1) HBM accessories: bellows-type couplings. You will need two of these couplings.
2) HBM accessories: bellows-type couplings. You will need one of these couplings.
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8T20WN
HBM 10.05.2001
2.3 Couplings
HBM supplies bellows-type couplings for the installation of torque transducers.
When prepared for delivery, the couplings and the torque transducer are kept
separate. The following points must be observed during installation:
•Only tighten the clamping screws of the couplings once the shafts are
installed in the coupling hubs!
•The bellows-type coupling must not be overstretched beyond the specified
permissible flexibility.
•Drive and output shafts must be without burr.
•Run the shaft diameter with j6 tolerance, to produce the preferred fit H7/j6.
2.3.1 Installation position with couplings
With the bellows-type couplings, the T20WN torque transducer can be
operated in any installation position (horizontal, vertical or diagonal). With
vertical and diagonal operation, make sure that additional frames are
adequately supported.
2.3.2 Installation
1. Degrease the hub bore of each coupling half member and the shaft ends
with solvent (for example, acetone).
2. Push the hub onto the shaft, set the reference gap L (making use of the full
clamping length of the coupling) and align the shafts.
3. Tighten the clamp element clamping screws with a torque wrench (for the
required tightening torque, see Table1).
CAUTION
When installing the coupling, you must not exceed the permissible
axial and lateral forces or bending limit moments (see Page 17) of the
torque transducer!
When tightening the clamping screws, hold the coupling on the clamp
element.
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T20WN
HBM 10.05.2001
Measuring range Tightening torque
(Nm) (Nm)
0.1
0.2 0.35
0.5
1
20.75
5
10 1.5
20 14
50 35
100 75
200 120
Table1: Tightening torque of the clamping screws
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10 T20WN
HBM 10.05.2001
3 Electrical connection
3.1 Connector
The transducers are equipped with a permanent housing connector.
They can be connected to the relevant measurement electronics by using the
transducer connection cable (accessories, see Page 18). The pin assignment
for the transducer connection cable can be found in the following table:
Pin Pin assignment Wire
colour Release
calibration
ANo function BK signal
(without
BMeasurement signal speed/angle of
rotation 5V RD (without
VK20)
CMeasurement signal torque "10V BN
GH DMeasurement signal torque 0V WH
FJ
MEGround (supply+speed/angle of rotation) YE Bridge
A
D
ELKFSupply voltage +12V VT
A
B
C
DLGMeasurement signal speed/angle of
rotation 5V, 90°phase shifted GN
HNo function PK Switch
JNo function GY (NO)
KCalibration signal (to pin D) GY/PK
LNo function BU/RD
MCable shield BU
3.2 Cable extension
Extension cables must be the shielded, low-capacitance type. We recommend
the use of HBM cables that comply with these requirements.
When using cable extensions, ensure that the connection is perfect, with the
lowest possible contact resistance and good insulation. For this reason all
connections should be soldered, or at the very least should use firmly fixed
terminals or screwed connectors.
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T20WN
HBM 10.05.2001
Measurement cables should not be laid parallel to high-voltage lines or control
circuits (and therefore should not be laid in common cable shafts). If this is not
possible, protect the measurement cable with, for example, armoured steel
tubing and keep them as far away as possible from other cables. Avoid the
stray fields of transformers, motors and contactors.
3.3 Shielding design
The cable shielding is connected in accordance with the Greenline concept.
This encloses the measurement system in a Faraday cage. It is important that
the shield is laid flat on the housing ground at both ends of the cable. Any
electromagnetic interference active here does not affect the measurement
signal. Please comply with the connection notes in Chapter 9.1.1, starting on
Page 20.
In the case of interference caused by differences in potential (compensating
currents), separate the connections between the zero operating voltage and
the housing ground on the measuring amplifier and connect a potential
equalisation line between the transducer housing and the amplifier housing
(copper wire, 10mm2conductor cross-section).
4 Load-carrying capacity
Torque transducers T20WN are suitable for measuring static and dynamic
torque.
Nominal torque can be exceeded statically up to the limit torque. If nominal
torque is exceeded, additional irregular loading is not permissible. This
includes longitudinal forces, lateral forces and bending moments. Limit values
can be found in the ”Specifications”chapter, Page 15.
4.1 Measuring dynamic torque
The following applies to the measurement of dynamic torque:
•The calibration carried out for static torque also applies for dynamic torque
measurement.
Note: The frequency of the dynamic torque must be lower than the natural
frequency of the mechanical measuring system.
•The natural frequency f0of the mechanical measuring system depends on
the moments of inertia J1and J2of the coupled rotating masses and
depends on the torsional stiffness of the transducer.
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12 T20WN
HBM 10.05.2001
The natural frequency f0of the mechanical measuring system can be
determined from the following equation.
f0+1
2p·cT·ǒ1
J1
)1
J2Ǔ
Ǹf0= Natural frequency in Hz
J1, J2= Moment of inertia in kgm2
cT= Torsional stiffness in Nm/rad
•The vibration bandwidth (peak-to-peak) must not exceed 80% of the
nominal torque identified for the torque transducer, even at alternating load.
In all cases the vibration bandwidth must lie within the loading range defined
by –MNand +MN.
+MN100
–MN100
0
45
35
torque MNin %
80% MN
vibration bandwidth
Lower torque limit
Upper torque limit
Fig. 2.2 Permissible dynamic loading
4.2 Maximum rotation speed
Torque transducers T20WN allow torque measurements up to a rotation speed
of 10 000min–1and rotation speed measurements up to 3000min–1.
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T20WN
HBM 10.05.2001
5 Displaying torque and direction of rotation
Torque
If a right-hand torque (clockwise) is initiated, there is a positive output signal
(0...+10V).
Direction of rotation
The sign on the display indicates the direction of rotation. With HBM measuring
amplifiers, the output voltage or display is positive, if the transducer shaft is
turning clockwise, looking at the measuring side.
Measuring side mark
Fig.10.1: Direction of rotation for positive display
6 Maintenance
Torque transducers T20WN are largely maintenance free. We recommend that
the low-friction special bearing should be replaced at the Darmstadt factory,
after approx. 20 000 working hours. The calibration will also be checked at this
time.
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14 T20WN
HBM 10.05.2001
7 Dimensions
ab
c
x
k
l
m
ffe
hh
g
∅d3f7
∅d1g6
∅d2g6
∅d3f7
0.1Nm...2Nm aluminium
5Nm...200Nm steel
y on both
sides
=
Drive sideMeasuring side
BA
Measuringside mark
Meas. Dimensions (in mm)
range
(Nm) a b c e f g h k l m ∅d1∅d2∅d3∅d4y1) x1)
0.1 40 11 22 62 2 95 14 28 14 48.5 6 8 27 32 M3/6 M3/5
0.2 40 11 22 62 2 95 14 28 14 48.5 6 8 27 32 M3/6 M3/5
0.5 40 11 22 62 2 95 14 28 14 48.5 6 8 27 32 M3/6 M3/5
1 40 11 22 62 2 95 14 28 14 48.5 6 8 27 32 M3/6 M3/5
2 40 11 22 62 2 95 14 28 14 48.5 6 8 27 32 M3/6 M3/5
5 60 9.5 32 79 2 145 30 42 21 58 16 16 38 46 M3/6 M3/6
10 60 9.5 32 79 2 145 30 42 21 58 16 16 38 46 M3/6 M3/6
20 60 9.5 32 79 2 145 30 42 21 58 16 16 38 46 M3/6 M3/6
50 42 15 40 72 3 170 45 56 28 73 26 26 54 65 M4/8 M4/8
100 42 15 40 72 3 170 45 56 28 73 26 26 54 65 M4/8 M4/8
200 42 15 40 72 3 170 45 56 28 73 26 26 54 65 M4/8 M4/8
1)Size of thread/depth of thread
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T20WN
HBM 10.05.2001
8 Specifications
Type T20WN
Accuracy class 0.2
Torque measuring system
Nominal torque MNNm 0.1 0.2 0.5 1 2 5 10 20 50 100 200
Nominal sensitivity
(Nominal signal range
between torque = zero and
nominal torque) V 10
Characteristic tolerance
(deviation of the actual
output at MNof the nominal
signal range) %"0.2
Output signal for torque =
zero V 0"0.2%
Nominal output signal
at positive nominal torque V +10
at negative nominal torque V–10
Load resistance MΩ> 1
Long-term drift over 48h mV <"50
Cut-off frequency (–3dB) Hz 200
Residual ripple mVPP < 80
Effect of temperature per
10K in nominal
temperature range
on the output signal,
relative to the actual value
of the signal span %"0.2
on the zero signal, relative
to the nominal sensitivity %"0.2
Power supply
Nominal supply voltage
(separated extra-low voltage
(SELV)) V12 (DC); (10.8...13.2)
Release of calibration signal V 5...13.2
Current consumption in
measuring mode A< 0.2
Nominal power consumption W< 2.4
Characteristic curve
deviation, by reference to
nominal sensitivity % <"0.2 (typically <"0.1)
Variance, by reference to
the variation of the output
signal % <"0.05
Calibration signal V 10"0.2%
Nominal speed rpm 10 000
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16 T20WN
HBM 10.05.2001
Speed/angle of rotation measurement system
Nominal torque MNNm 0.1 0.2 0.5 1 2 5 10 20 50 100 200
Measurement system Visual
Pulses per rotation No. 360
Output signal V5 (asymmetric); two square wave signals, approx. 90°
phase shifted
Minimum speed for
sufficient pulse stability rpm 0
Load resistance kW> 10
Maximum measurable
rotation speed rpm 3000
General specifications
EMC
Immunity from interference
(DIN EN50082–2)
Electromagnetic field
RF enclosure V/m 10
Wiring VPP 10
Magnetic field A/m 100
Burst kV 2/1
DSE kV 4/8
Emission (EME) (EN55011)
RFI voltage Class B
RFI field strength Class B
Degree of protection to
EN 60529 IP40
Weight, approx. kg 0.17 0.34 0.6
Nominal temperature
range °C [°F] +5...+45[41...113]
Operating temperature
range °C[°F] 0...+60[32...140]
Storage temperature range °C[°F]–5...+70[23...158]
Impact resistance, test
severity level according to
DIN IEC 68; Part 2-27;
IEC 68-2-27-1987
Number n 1000
Duration ms 3
Acceleration (half-sine) m/s2650
Vibration resistance, test
severity level according to
DIN IEC 68, Part 2-6: IEC
68-2-6-1982
Frequency range Hz 5...65
Duration h 1.5
Acceleration (amplitude) m/s250
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T20WN
HBM 10.05.2001
Nominal torque
MNNm 0.1 0.2 0.5 1 2 5 10 20 50 100 200
Load limit 3)
Limit torque,
relative to MN% 200 4)
Breaking torque,
relative to MN%> 280
Axial limit force kN 0.2 0.2 0.2 0.34 0.5 1.1 1.75 2.75 5.3 7.6 12.5
Lateral limit force N 3.6 3.6 3.6 5.7 8.3 18.2 29 46 88 127 207
Bending limit
moment Nm 0.12 0.12 0.12 0.23 0.4 0.93 1.9 3.7 10 17 36
Vibration
bandwidth to
DIN 50 100
(peak-to-peak) 5) % 80
Mechanical values
Torsional
stiffness CT
kNm
/rad 0.03 0.03 0.03 0.05 0.07 0.91 1.9 3.25 14 21.9 32.6
Torsion angle at
MNDeg. 0.2 0.38 0.96 1.1 1.7 0.32 0.3 0.35 0.2 0.26 0.35
Max. limits for
relative shaft
vibration
(peak-to-peak)6) µmsmax +4500
n
Ǹn in rpm
Effect. vibration
velocity in the
area of the housing
in accordance with
VDI 2056 mm/
sveff +n
Ǹ
3n in rpm
Mass moment of
inertia of the rotor
(around the axis
of rotation) with
the speed
measuring
system (x10–3)gm20.06 0.06 0.06 0.063 0.068 6.1 6.13 6.23 53.7 54.6 57.2
3)Each type of irregular stress (bending moment, lateral or axial load, exceeding nominal torque) can only be
permitted up to its specified limit value provided none of the others can occur at the same time. If this
condition is not met, the limit values must be reduced. If 30% of the bending limit moment and lateral force
limit occur at the same time, only 40% of the axial limit force is permissible and nominal torque must not be
exceeded. The permissible bending moments, axial forces and lateral forces can affect the measurement
result by approx. 1% of nominal torque.
4)Please comply with the maximum torque (TKmax) of the couplings.
5)Nominal torque must not be exceeded.
6)Relative undulation following DIN 45670/VDI 2059.
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18 T20WN
HBM 10.05.2001
9 Accessories
Accessories include the following components:
•transducer connection cable, 5m long, order no. 3-3301.0158
•transducer connection cable, 10m long, order no. 3-3301.0159
•cable socket, 12-pin (linkage), order no. 3-3312.0268
•terminal box, order no. 1-VK20
•mains device (14.4V=/300mA), order no. 3-3318.0002
•connection cable, 1.5m long (D-sub, 15-pin), order no. 1-Kab151-1.5
•connection cable, 1.5m long (D-sub, 5-pin), order no. 1-Kab152-1.5
•bellows-type couplings
T20WN
transducer connection cable
3–3301.0158
3–3301.0159
connection cable
1–Kab151–1.5
1–Kab152–1.5
plug-in power
supply unit
3–3318.0002
MGCplus/AP01
Spider8/SR55
MGCplus/AP17
PME/MP60
Spider8
HBM electronics
Md
n
PME/MP01
Spider8/SR01 Md
or
connection cable
1–Kab151–1.5
VK20 terminal box
Fig.9.1: Accessories for electrical connection
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19
T20WN
HBM 10.05.2001
9.1 VK20 terminal box
You can connect the torque transducer T20WN to the HBM measurement
electronics by using the VK20 terminal box. If the measurement electronics do
not include supply voltage, you can connect the power supply unit
(14.4V=/300mA) or another 24V power source (14V...30V) to St7.
St1 St2 St3 St4
St7 St6 St5
16161616
616161
External
calibration signal
T20WN
Supply
voltage
Md
n
Fig.9.2: Connection clamps in the opened VK20 terminal box
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20 T20WN
HBM 10.05.2001
9.1.1 Mechanicalconnection of the connector cables
The terminal box includes a set of cable sleeves, intended for bushing the
transducer connection cable, the voltage supply and the Md/n outputs. The
side hole for the external calibration signal is closed with a screw for delivery. If
need be, use a suitable PG7 screwed joint with an anti-buckling socket.
Anti-buckling socket,
internal ∅7mm
Anti-buckling socket,
internal ∅5mm
Cable shield
looped round
clamping ring
Clamping ring
Cable sleeve Rubber seal
Wall of the housing
Fig.9.3: Cable bushing ”T20WN”and ”POWER”at the terminal box
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