HBM Paceline CMC Series User manual

A2319‐4.0 en/de/fr
Piezoelectric
force measurement chain
Piezoelektrische
Kraftmesskette
Chaîne de mesure
piézo-électrique
CMC
Operating manual
Bedienungsanleitung
Manuel d'emploi

English Page 3 - 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deutsch Seite 27 - 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Francais Page 51 - 75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Contents Page
English
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of supply 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Application instructions 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Conditions on site 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Ambient temperature 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Moisture and humidity 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Deposits 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Structure and principle of operation 12. . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Mechanical installation 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Important precautions during installation 14. . . . . . . . . . . . . . . . . . . .
5.2 General installation guidelines 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Installation for compressive loading 14. . . . . . . . . . . . . . . . . . . . . . . .
6 CMA charge amplifier 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Function 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 TEDS transducer identification 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 Replacement 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Specifications (VDI/VDE2638 standards) 25. . . . . . . . . . . . . . . . . . . . . . .
8 Dimensions (in mm; 1 mm = 0.03937 inches) 27. . . . . . . . . . . . . . . . . . .

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Safety instructions
Appropriate use
The CMC piezoelectric force measurement chain is intended for compressive
force measurements in test benches, press‐fit processes, test and inspection
equipment and presses. Use for any additional purpose shall be deemed to
be not appropriate.
In the interests of safety, the measurment chain should only be operated as
described in the Mounting Instructions. It is also essential to comply with the
legal and safety requirements for the application concerned during use. The
same applies to the use of accessories.
The force measurement chain is not a safety element within the meaning of
appropriate use. For safe and trouble‐free operation, this transducer must not
only be correctly transported, stored, sited and mounted but must also be
carefully operated and maintained.
Each time, before starting up the equipment, 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.
Additional safety precautions must be taken in plants where malfunctions
could cause major damage, loss of data or even personal injury. In the event
of a fault, these precautions establish safe operating conditions.
This can be done, for example, by mechanical interlocking, error signaling,
limit value switches, etc.
The charge amplifier is not a safety element within the meaning of its intended
use. For safe and trouble‐free operation, this amplifier must not only be cor
rectly transported, stored, sited and mounted but must also be carefully oper
ated and maintained.
The device must not be connected directly to the mains supply. The
maximum supply voltage must not exceed 18 to 30 VDC.
General dangers of failing to follow the safety instructions
The CMC piezoelectric force measurement chain is state of the art and
reliable.
Measurement chains can give rise to remaining dangers if they are
inappropriately installed and operated by untrained personnel.
Everyone involved with siting, starting‐up, maintaining or repairing a force
transducer must have read and understood the Mounting Instructions and in
particular the technical safety instructions.

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Conditions at the place of installation
Protect the force measurement chain from moisture and dampness or
weather conditions such as rain, snow, ice and salt water.
To comply with EN 61326-1, para. 3.6 , the connecting leads of the CMC
force measurement chain must not be more than 30 m in length (if run in a
building) and must not exit the building.
Maintenance
The CMC piezoelectric force measurement chain is maintenance free.
Accident prevention
The prevailing accident prevention regulations must be taken into account,
even though the nominal (rated) force values in the destructive range are well
in excess of the full scale value.
Remaining dangers
The scope of supply and performance of the charge amplifier covers only a
small area of measurement technology. In addition, equipment planners, in
stallers and operators should plan, implement and respond to the safety engi
neering considerations of measurement technology in such a way as to mini
mize remaining dangers. Prevailing regulations must be complied with at all
times. There must be reference to the remaining dangers connected with
measurement technology. After making settings and carrying out activities that
are password‐protected, you must make sure that any controls that may be
connected remain in safe condition until the switching performance of the am
plifier system has been tested.

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Remaining dangers are indicated in these Mounting Instructions by the
following symbols:
Symbol: WARNING
Meaning: 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: ATTENTION
Meaning: Possibly 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 (the Declaration
of Conformity can be found at http://www.hbm.com/HBMdoc).
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.

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Conversions and modifications
The force measurement chain 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.
In particular, any repair or soldering work on motherboards is prohibited.
When exchanging complete modules, use only original parts from HBM.
The product is delivered from the factory with a fixed hardware and software
configuration. Changes can only be made within the possibilities documented
in the manuals.
Qualified personnel
This force measurement chain must only be installed by qualified personnel,
strictly in accordance with the specifications and in conjunction with the safety
requirements and regulations listed below.
Qualified personnel means persons entrusted with siting, mounting, starting
up and operating the product, who possess the appropriate qualifications for
their function.
This device is only to be installed and used by qualified personnel strictly in
accordance with the specifications and with the safety rules and regulations
which follow.
This includes people who meet at least one of the three following require
ments:
•Knowledge of the safety concepts of automation technology is a require
ment and as project personnel, you must be familiar with these concepts.
•As automation plant operating personnel, you have been instructed how to
handle the machinery and are familiar with the operation of the equipment
and technologies described in this documentation.
•As commissioning engineers or service engineers, you have successfully
completed the training to qualify you to repair the automation systems. You
are also authorized to activate, to ground and label circuits and equipment
in accordance with safety engineering standards.
It is also essential to comply with the legal and safety requirements for the ap
plication concerned during use. The same applies to the use of accessories.
Maintenance and repair work on an open device with the power on must only
be carried out by trained personnel who are aware of the dangers involved.

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1 Scope of supply
Order number
1‐CMC / 5 kN CFT/ 5 kN piezoelectric force transducer , 3 m transducer
connection cable CMA / 39 charge amplifier
1‐CMC / 20 kN CFT/ 20 kN piezoelectric force transducer , 3 m transducer
connection cable CMA / 158 charge amplifier
1‐CMC / 50 kN CFT / 50 kN piezoelectric force transducer, 3 m transducer
connection cable CMA / 210 charge amplifier
1‐CMC / 70 kN CFT / 70 kN piezoelectric force transducer, 3 m transducer
connection cable CMA / 287 charge amplifier
1‐CMC / 120 kN CFT / 120 kN piezoelectric force transducer, 3 m transducer
connection cable CMA / 482 charge amplifier
To be ordered separately:
1‐KAB168‐5 8-core cable to continuing electronics, 8‐wire,
M12x1 cable plug, 5 m long, free ends
1‐KAB168‐20 8-core cable to continuing electronics, 8‐wire,
M12x1 cable plug, 20 m long, free ends
NOTE
The piezoelectric force transducer is only delivered together
with the calibrated measurement chain.
The transducer is only ever available separately as a
replacement.
2 Application instructions
Piezoelectric force measurement chains of the CMC type series are suitable
for measuring compressive forces. Because they provide highly accurate
dynamic and quasi‐static force measurements, they must be handled very
carefully. Particular care must be taken when transporting and installing the
devices. Dropping or knocking the transducers may cause permanent
damage.
The transducers are extremely rigid and have a high natural frequency.
The specifications list the permissible limits for mechanical, thermal and
electrical stress. It is essential that these are taken into account when
planning the measuring set‐up, during installation and ultimately, during
operation.

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3 Conditions on site
ATTENTION
The insulation resistance is crucial for piezoelectric transducers; it
should be greater than 1013 ohms. To obtain this value , all the
plug connections have to be kept thoroughly clean. A positive or
negative signal drift of the nominal (rated) output signal indicates
insufficient insulation resistance. The plug connection contacts
should then be cleaned with a clean, lint‐free cloth and a cleaning
agent (petroleum ether, isopropanol).
ATTENTION
Protect the transducer plug and the transducer connection
socket of the charge amplifier against pollution and under no
circumstances touch the connectors (plug face) with your
hand. The supplied cover should always be in place when the
connection is not in use.
Use only the connection cable included in the scope of supply.
Once mounted, it should remain connected to the transducer, if possible.
3.1 Ambient temperature
The temperature has little effect on the output signal. To obtain optimum mea
surement results, the nominal (rated) temperature range must be observed.
Temperature‐related measurement errors are caused by heating on one side
(e.g. radiant heat) or by cooling. A radiation shield and all‐round thermal in
sulation produce noticeable improvements, but must not be allowed to form a
force shunt.

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3.2 Moisture and humidity
Moisture and humidity or a tropical climate are to be avoided. When the
connection cable is properly connected to the force transducer/charge
amplifier, the CMC force measurement chain has degree of protection IP65
per EN 60529.
3.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate
sufficiently to divert some of the measuring force onto the housing, thus
invalidating the measured value (force shunt).

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4 Structure and principle of operation
The piezoelectric force measurement chain comprises a force transducer, a
3 m long transducer connection cable and a charge amplifier adapted to the
particular force transducer.
The measuring chain as delivered is calibrated jointly.
The force transducers of the CMC force measurement chain operate in
accordance with the piezoelectric principle.
Compressive forces are transmitted to measuring elements sensitive to force
via pre‐stressed mounting bases. These separate the electrical charges in
proportion to the force displacement. A charge amplifier then converts these
electrical charges to an analog voltage signal.
Anti‐fatigue bolt
Thrust piece
Measuring elements
Housing
Clamping device
Force is applied via the upper/lower mounting surface. Depending on the
measuring range, the transducer can be connected to the customer side load
application by a central internal thread or by four flange threads.

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50 kN 20 kN
Measurement follows the piezoelectric principle of measurement, with
extreme rigidity (see nominal (rated) displacement in the specifications).
The force transducer is hermetically welded. Device plugs are used to
connect the transducer connection cable included in the scope of supply.
The compressive force generates a negative electric charge, which is
converted by the charge amplifier to a positive output voltage.

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5 Mechanical installation
5.1 Important precautions during installation
•Handle the transducer gently
•Do not overload the transducer
•Welding currents must not be allowed to flow over the transducer. If there is
a risk that this might happen, you must use a suitable low‐ohm connection
to electrically bypass the transducer. HBM, forexample, provides the highly
flexible EEK ground cable, which can be screwed on, both above and
below the transducer.
WARNING
Additional safeguards must be provided if there is a risk that
overloading the transducer may cause it to break, which
could put people at risk.
5.2 General installation guidelines
The forces to be measured must act on the transducer as accurately as
possible in the direction of measurement. Torsional and bending moments,
eccentric loading and lateral forces may produce measurement errors and
destroy the transducer, if limit values are exceeded (see Specifications).
5.3 Installation for compressive loading
The transducer is bolted directly by the ring‐shaped mounting surfaces on the
top and bottom of the force transducer to a stiff, fully bearing structural
element (such as a profile, cover or plate). With this type of installation, the
transducer can measure axial forces in the pressure direction.
•For exact positioning, the transducer is fitted with centering aids on the
upper and lower mounting surfaces.
•To achieve calibration accuracy over the entire force range, the roughness
of the support surfaces must be Ra v0.8 μm and the hardness,
> 40 HRC.
•The support surfaces must be thoroughly cleaned before mounting.

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NOTE:
Ø D2
Center CFT (50 kN, 70 kN, 120 kN) over diameter D2.
admissible
centering depth 2
mm
F
MA
MA
45oor 22.5o
offset in the drawing
Fig. 5.1 Force transducer installation
Nominal
(rated) force
(kN)
Centering
diameter H7
D2
Tightening
torque MA(NVm) Screws for transducer
mounting
min. floor side
thread reach (mm)
5 kN - 0.5 1 x M 2.5; 12.9 2
20 kN - 1 1 x M 4; 12.9 3
50 kN 10 2 4 x M 4; 12.9 4
70 kN 14 4 4 x M 5; 12.9 5
120 kN 21 21 4 x M 8; 12.9 8
ATTENTION
The compressive force is transferred over the adaptation
pieces flanged on the face (property class at least. 12.9) or the
mounting parts with relevant support surfaces. The length of
the screws must be such that the depth of the tapped blind
hole in the flange of the transducer is utilized. However, the
screws must not rest on the end of the tapped blind hole.
NOTE
When tightening the screwed connections, use an
open‐ended spanner on the transducer housing to hold it
steady (dimension M, Chapter 8).

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6 CMA charge amplifier
6.1 Function
The CMA charge amplifier is connected to the force transducer for signal
conditioning. This amplifies the electric charges to a proportional output signal
of -10 - +10 V DC (see the test certificate for accurate data). The supply
voltage, measurement signal, inputs and TEDS are connected to the
subsequent evaluating devices via the 8‐pin M12 device plug. The CMA
charge amplifier is designed for DC operation (18 ... 30 V). The electrical
circuit is intended for operation with a separated extra low voltage (SELV
circuit).
The functions of the charge amplifier can be changed via the
MEASURE / RESET and RANGE 1 / RANGE 2 inputs.
The charge amplifier is fitted with TEDS (Transducer Electronic Data Sheet).
In keeping with the choice of measuring range (RANGE 1/ RANGE 2), the
valid TEDS information for the particular measuring range is forwarded to the
downstream evaluating electronics, if this is TEDS‐compliant. The High Level
Voltage template is used. For more detailed information, see Section 6.2.
CFT piezoelectric
force transducer
CMA charge amplifier
Supply voltage
18 ... 30 VDC
RANGE 1 / RANGE 2
MEASURE / RESET
Output voltage
-10 ... +10 VDC
TEDS
0 VDC
0 VDC
Fig. 6.1 Block diagram of the CMC measuring chain
MEASURE / RESET
With an input voltage of 0 V at PIN 3, the charge amplifier is in measurement
mode (MEASURE). If a voltage of 24 V is present at PIN 3, the charge
amplifier switches to RESET.

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Setting RESET will set the amplifier output signal to zero. This can be done
with any applied force. The advantage of the Reset function is that you can
compensate initial loads and drift factors. A measurement can also be started
at a high force level.
10 V
RESET
0% 80%
0 V
2 V
-8 V
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
OVERLOAD RANGE
Removal of
force
100% Fnom
Fig. 6.2 Reset function
ATTENTION
After RESET, although the charge amplifier output is set to
zero, this does not mean that the machine generating the
force is force‐free.
Make sure that the force transducer is not overloaded, even
though the output signal is still in the -10 ‐ +10 V range.
Once all the force is removed, a negative voltage signal is
present at the value of the voltage output for a RESET,
without having to reset again.

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RANGE1 / RANGE 2
If a voltage of 0 V is present at Pin 2, measuring range 1 (100% Fnom) is
active at the charge amplifier. The charge amplifier gives you the option to
zoom into a second measuring range (20 % of the nominal (rated) force /
output span). A voltage of 24 V DC must be applied at PIN 2 for this.
10 V
2 V
0 V 0 V
10 V
0% 100% 100%0% 20%
RANGE 1 / RESET RANGE 2 / RESET
Fig. 6.3 Zooming into the second measuring range
Changing the measuring range to 20% can also be used to operate the force
transducer with high safety reserves for measurement tasks where overload is
critical. The charge amplifier overloads above 20%.
1
2
4
Supply voltage 0 V (GND)
Output signal -10 - +10 V
RANGE 1 / RANGE 2
TEDS
RESET / MEASURE
5
white
brown
green
yellow
gray
3Connection
cable wire
assignments
KAB 168
6
7
8
Signal ground
Do not assign !
Supply voltage 18 - 30 VDC1)
pink
blue
red
NOTE
The cable shield must not be connected to the
housing ground of the downstream evaluating
electronics. PIN 7 is for HBM internal use only and
must not be assigned.
M12 x 1, 8‐pol
1) Operation with SELV circuit (separated extra low voltage)
Fig. 6.4 PIN assignment

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The supply voltage and the RANGE1 / RANGE2 and MEASURE / RESET
control inputs are electrically isolated from the measurement circuit.
NOTE
Piezoelectric force transducers and charge amplifiers are
calibrated jointly as a measuring chain at the factory. They
make up a single unit, which is marked by an identical
production number on the force transducer and on the charge
amplifier. The data stored in TEDS are only valid for the
particular two‐part measuring chain (see Section 6.3).
ATTENTION
If either the force transducer or the charge amplifier are
replaced, calibration is no longer valid. Incorrect measured
values could be displayed and/or forwarded to downstream
evaluating electronics.
Two through‐holes (Ø 4 mm) are provided for screw‐mounting the charge am
plifier.
6.2 TEDS transducer identification
TEDS stands for ”Transducer Electronic Data Sheet”. An electronic data sheet
per the IEEE 1451.4 standard is stored in the charge transducer of the
piezoelectric measurement chain, making it possible for the downstream
evaluating electronics to be set up automatically. The suitably equipped
evaluating electronics import the measuring chain characteristics (electronic
data sheet), translate them into its own settings and measurement can start.
Switching from Range1 to Range 2 automatically makes the valid TEDS
information available as well.
TEDS then has to be re‐imported by the downstream evaluating electronics.
A digital identification system is available at PIN 4 (to ground). The basis for
this is a DS2433 1‐wire EEPROM, made by Maxim/Dallas.

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Content of TEDS memory per IEEE 1451.4:
The information in the TEDS memory is organized into templates which are
prestructured to store defined groups of data in table form. Only the entered
values are stored in the TEDS memory itself.
The amplifier firmware assigns the interpretation of the respective numerical
values. This places a very low demand on the TEDS memory.
The memory contents are divided into four areas:
Area 1:
An internationally unique identification number (cannot be changed).
Area 2:
The base area (basic TEDS), to the configuration defined in standard IEEE
1451.4. The transducer type, the manufacturer and the transducer serial
number are contained here.
Area 3:
Data specified by the manufacturer are contained in this area:
These specify
- the transducer type,
- the measured quantity,
- the electrical output signal,
- the required excitation.
HBM has already described the High Level Voltage template for the CMC
piezoelectric force measurement chain.

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Example:
Content written by HBM, on the basis of the individual test certificate: Area 3
of the CMC/20kN force measurement chain with identification no. 123456,
made by HBM on 27.6.2007.
Template: High Level Voltage
Parameter Value 1) Unit Change
require
s rights
to level:
Explanation
Transducer Electrical
Signal Type Voltage Sensor ID
Minimum Force/Weight 0.000 N CAL The physical measured quantity and
unit are defined when the template
is created, after which they cannot
be changed.
Maximum Force/Weight 20.000 k NCAL
Minimum Electrical
Value 0.00000 V/V CAL The difference between these
values is the sensitivity according to
the HBM test certificate or from
calibration1).
Maximum Electrical
Value +9.95700 V/V CAL
Mapping Method Linear This entry cannot be changed.
AC or DC Coupling DC ID
Output Impedance of
the sensor 10.0 Ohm ID Output resistance according to the HBM data sheet.
Response Time 1.0000000u sec ID Of no significance for HBM
transducers.
Excitation Level
(Nominal) 24.0 V ID Supply voltage according to the HBM data sheet
Excitation Level
(Minimum) 18.0 V ID Lower limit for the operating range of the supply voltage according to
the HBM data sheet.
Excitation voltage Type DC ID Supply voltage type
Max. current draw at
nominal excitation level 50.12m A ID Maximum supply current
1) Typical values for the CMC/20kN piezoelectric force measurement chain