HBM T20WN User manual

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T20WN

Hottinger Baldwin Messtechnik GmbH
Im Tiefen See 45
D-64239 Darmstadt
Tel. [phone]
Fax [phone]
Email: [email protected]
Internet: www.hbm.com
Mat.: 7-2001.0555
DVS: A0726-14.0
05.2014
EHottinger Baldwin Messtechnik GmbH.
Subject to modifications.
All product descriptions are for general information only.
They are not to be understood as a guarantee of quality or
durability.
Änderungen vorbehalten.
Alle Angaben beschreiben unsere Produkte in allgemeiner
Form. Sie stellen keine Beschaffenheits- oder Haltbarkeits
garantie im Sinne des §443 BGB dar.
Sous réserve de modifications.
Les caractéristiques indiquées ne décrivent nos produits
que sous une forme générale. Elles n'impliquent aucune
garantie de qualité ou de durablilité.

Mounting instructions | Montageanleitung |
Notice de montage
English Deutsch Francais
T20WN

2 A0726-14.0 T20WN
English
1 Safety instructions 3........................................
2 Application 6...............................................
3 Installation 7...............................................
3.1 Installation position 7.........................................
3.2 Installation options 7.........................................
3.3 Couplings 8.................................................
3.3.1 Installation position with couplings 8............................
3.3.2 Installation 8................................................
4 Electrical connection 10......................................
4.1 General instructions 10........................................
4.2 Connector 10.................................................
4.3 Cable extension 11...........................................
4.4 Shielding design 12...........................................
5 Load‐carrying capacity 13....................................
5.1 Measuring dynamic torque 13..................................
5.2 Maximum rotation speed 14....................................
6 Displaying torque and direction of rotation 15.................
7 Maintenance 16..............................................
8 Dimensions 17..............................................
9 Specifications 18............................................
10 Accessories 24..............................................
10.1 Bellows‐type couplings 25......................................
10.1.1 Dimensions for the bellows‐type couplings (in mm) 25.............
10.1.2 Specifications for bellows‐type couplings 26......................

Safety instructions
T20WN A0726-14.0 3
1 Safety instructions
Use in accordance with the regulations
Torque transducer T20WN is 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 mean
ing 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

Safety instructions
4 A0726-14.0 T20WN
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.
In this Operating Manual remaining dangers are pointed
out using the following symbols:
Symbol Significance
CAUTION This marking warns of a potentially dangerous
situation in which failure to comply with safety
requirements can result in slight or moderate physical
injury.
Note This marking draws your attention to a situation in
which failure to comply with safety requirements can
lead to damage to property.
Emphasis
See….
Italics are used to emphasize and highlight text and
references to other chapters and external documents.
CE mark
The CE mark enables the manufacturer to guarantee that
the product complies with the requirements of the rele
vant EC directives (the declaration of conformity is avail
able at http://www.hbm.com/HBMdoc).
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.

Safety instructions
T20WN A0726-14.0 5
For more detailed information on disposal, please contact
the local authorities or the dealer from whom you pur
chased 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 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.
Prevention of accidents
In accordance with the health and safety regulations
relevant to accident prevention, once the operator has
fitted the torque transducer, a cover or cladding must be
attached as follows:
SThe cover or cladding must not be free to rotate.
SThe 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.

Application
6 A0726-14.0 T20WN
SCovers and cladding must be positioned at a suitable
distance or so arranged that it prevents access to any
moving parts within.
SCovers 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.
2 Application
Torque transducer T20WN measure static and dynamic
torque and rotation speeds or angles of rotation for
turning or static machine parts in any direction of rotation.
It is designed for small to medium‐sized torque, such as
that measured on performance or function test benches
for domestic or business machines.

Installation
T20WN A0726-14.0 7
3 Installation
3.1 Installation position
Any installation position can be chosen for torque
transducer (see Chapter 3.3.1).
3.2 Installation options
CAUTION
The permissible load limits given in the specifications
(see Page 18) are mandatory.
ÈÈ
ÈÈ
ÈÈ
ÈÈÈÈÈÈÈ
ÈÈÈÈÈÈÈ
ÈÈ
ÈÈÈ
ÈÈÈ
F
Base mounting
between two full
couplings1)
Front mounting,
full coupling on the
right 2)-belt drive on
the left
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.
Fig. 3.1 Installation options with couplings

Installation
8 A0726-14.0 T20WN
3.3 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:
SOnly tighten the clamping screws of the couplings
once the shafts are installed in the coupling hubs!
SThe bellows‐type coupling must not be overstretched
beyond the specified permissible flexibility.
SDrive and output shafts must be without burr.
SRun the shaft diameter with j6 tolerance, to produce
the preferred fit H7/j6.
3.3.1 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 diago
nal operation, make sure that additional frames are ade
quately supported.
3.3.2 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.

Installation
T20WN A0726-14.0 9
3. Tighten the clamp element clamping screws with a
torque wrench (for the required tightening torque, see
Tab. 3.1).
CAUTION
When installing the coupling, you must not exceed the
permissible axial and lateral forces or bending limit
moments (see Page 23) of the torque transducer!
When tightening the clamping screws, hold the coupling
on the clamp element.
Measuring range Tightening torque
(N·m) (N·m)
0.1
0.35
0.2
0.5
10.75
2
51.5
10
20 14
50 35
100 75
200 120
Tab. 3.1 Tightening torque of the clamping screws

Electrical connection
10 A0726-14.0 T20WN
4 Electrical connection
4.1 General instructions
We recommend to use shielded, low-capacitance cable
from HBM for the electrical connection between torque
transducer and measuring amplifier.
With cable extensions it is important to ensure that a
good connection is provided, with minimum contact resis
tance and good insulation. All plug connections or cap
nuts have to be tightened firmly.
Do not route measurement cables in parallel to power
lines and control circuits. If this is not possible (for exam
ple in cable ducts), maintain a minimum distance of
50 cm and protect the cable with a steel tube.
Avoid transformers, motors, contactors, thyristor con
trollers and similar sources of stray fields.
4.2 Connector
The transducer is equipped with a permanent housing
connector.
It can be connected to the relevant measurement
electronics by using the transducer connection cable
(accessories, see Page 24). The pin assignment for the
transducer connection cable can be found in the following
table:

Electrical connection
T20WN A0726-14.0 11
A
B
C
D
E
F
G
J
H
L
M
K
Pin Pin assignment Wire
colour
Bridge
Switch
(NO)
Release cali
bration signal
(without
VK20A)
ANo function BK
BMeasurement signal speed/
angle of rotation 5 V
RD
CMeasurement signal torque
"10 V
BN
DMeasurement signal torque
0 V
WH
EGround (supply+speed/
angle of rotation)
YE
FSupply voltage +12 V VT
GMeasurement signal speed/
angle of rotation 5 V, 90°
phase shifted
GN
HNo function PK
JNo function GY
KControl signal trigger GY/PK
LNo function BU/RD
MCable shield BU
4.3 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.

Electrical connection
12 A0726-14.0 T20WN
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.
4.4 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.
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, 10 mm2
conductor cross‐section).

Load‐carrying capacity
T20WN A0726-14.0 13
5 Load‐carrying capacity
The torque transducer T20WN is 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 chapter 9 ”Specifications”, page 18.
5.1 Measuring dynamic torque
The following applies to the measurement of dynamic
torque:
SThe 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 sys
tem.
SThe natural frequency f0of the mechanical measuring
system depends on the moments of inertia J1and J2
of the coupled rotating masses and depends on the
torsional stiffness of the transducer.
The natural frequency f0of the mechanical measuring
system can be determined from the following equation.

Load‐carrying capacity
14 A0726-14.0 T20WN
f0+1
2p· cT·ǒ1
J1
)1
J2ǓǸf0= Natural frequency in Hz
J1, J2= Moment of inertia in kg⋅m2
cT= Torsional stiffness in N⋅m/rad
SThe 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. 5.1 Permissible dynamic loading
5.2 Maximum rotation speed
Torque transducer T20WN allows torque measurements
up to a rotation speed of 10 000 min-1 and rotation speed
measurements up to 3000 min-1.

Displaying torque and direction of rotation
T20WN A0726-14.0 15
6 Displaying torque and direction of rotation
Torque
If a right‐hand torque (clockwise) is initiated, there is a
positive output signal (0...+10 V).
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. 6.1 Direction of rotation for positive display

Maintenance
16 A0726-14.0 T20WN
7 Maintenance
Torque transducer T20WN is 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.

Dimensions
T20WN A0726-14.0 17
8 Dimensions
Accessories:
Transducer connection cable
3‐3301.0158
3-3301.0159
acc. cable socket
3-3312.0268
∅d1
∅d2
h
hg
e
AB
Drive end
Measuring end
f
f
∅d3
∅d3
c
ab
xk
y on both sides
l
m
n
=
63
∼70
Ø17.2
Markin of the
measuring side
0.1 N⋅m ... 2 N⋅m Aluminium
5 N⋅m ... 200 N⋅m Steel
Meas.
range
(N·m)
Dimensions (in mm)
a b c e±1 f g h k±1l m±1nØ
d1
Ø
d2
Ø
d3
Ø
d4y3) x3)
0.1 40 11 22 62 2 95 14 28 14 48.5 30 6 8 27 32 M3/6 M3/5
0.2 40 11 22 62 2 95 14 28 14 48.5 30 6 8 27 32 M3/6 M3/5
0.5 40 11 22 62 2 95 14 28 14 48.5 30 6 8 27 32 M3/6 M3/5
1 40 11 22 62 2 95 14 28 14 48.5 30 6 8 27 32 M3/6 M3/5
2 40 11 22 62 2 95 14 28 14 48.5 30 6 8 27 32 M3/6 M3/5
5 60 9.5 32 79 2 145 30 42 21 58 42 16 16 38 46 M3/6 M3/6
10 60 9.5 32 79 2 145 30 42 21 58 42 16 16 38 46 M3/6 M3/6
20 60 9.5 32 79 2 145 30 42 21 58 42 16 16 38 46 M3/6 M3/6
50 42 15 40 72 3 170 45 56 28 73 56 26 26 54 65 M4/8 M4/8
100 42 15 40 72 3 170 45 56 28 73 56 26 26 54 65 M4/8 M4/8
200 42 15 40 72 3 170 45 56 28 73 56 26 26 54 65 M4/8 M4/8
3) Size of thread/depth of thread

Specifications
18 A0726-14.0 T20WN
9 Specifications
Type T20WN
Accuracy class 0.2
Torque measuring system
Nominal torque
MN
N·m 0.1 0.2 0.5 1 2 5 10 20 50 100 200
Nominal sensitiv
ity
(Nominal signal
range between
torque = zero and
nominal torque)
V 105
Characteristic tol
erance
(deviation of the
actual output at MN
of the nominal sig
nal range)
%"0.2
Output signal for
torque = zero
V0"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 48 h
mV <"50
Cut‐off frequency
(-3 dB)
Hz 200
Residual ripple mVPP < 80
Group delay time ms < 1,0