HBM PACEline CMA User manual

A25591.0en/de/fr
Charge amplifier
Ladungsverstärker
Amplificateur de charge
CMA
Operating manual
Bedienungsanleitung
Manuel d’emploi

English Page 3 − 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deutsch Seite 23 − 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FrançaisPage 43 − 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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CMA
HBMA2559−1.0en/de/fr
Contents Page
Safety instructions4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of supply 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2Applicationinstructions8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3Conditions onsite 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Ambient temperature 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Moisture and humidity 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4Mounting 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Electrical connection11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6Structure and principle of operation13. . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 TEDS transducer identification 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Replacement 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Specifications (VDI/VDE2638 standards) 21. . . . . . . . . . . . . . . . . . . . . . .
8Dimensions22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4CMA
HBM A2559−1.0en/de/fr
Safety instructions
Appropriate use
The CMA charge amplifier is to be used exclusivelyfor measurement tasks
and directlyrelated control tasks. Use for anypurpose other than the above is
deemed to be inappropriate.
In the interests of safety, the charge amplifier should onlybe operated as
described in the Operating Manual. It is also essential to complywith the legal
and safetyrequirements for the application concerned during use. The same
applies to the use of accessories.
Each time, before starting up the equipment, you must first run a project
planning and risk analysis that takes into account all the safetyaspects of
automation technology. This particularlyconcerns personal and machine
protection.
Additional safetyprecautions 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, bymechanical interlocking, error signaling,
limit value switches, etc.
The charge amplifier is not a safetyelement within the meaning of its intended
use. For safe and troublefree operation, this amplifier must not onlybe
correctlytransported, stored, sited and mounted but must also be carefully
operated and maintained.
The device must not be connecteddirectly tothe mains supply. The
maximum supply voltage must not exceed18 to30VDC.
General dangers of failing tofollow the safety instructions
The CMA charge amplifier corresponds to the state of the art and is failsafe.
The amplifier can give rise to remaining dangers if it is inappropriately
installed and operated byuntrained personnel.
Everyone involved with the installation, commissioning, maintenance or repair
of a charge amplifier must have read and understood the Mounting
Instructions and in particular the technical safetyinstructions.
Conditions at the place of installation
Protect the charge amplifier from moisture and dampness or weather
conditions such as rain, snow, ice and salt water.
According to EN 61326−1, Sect. 3.6, the connecting cables of the CMA
charge amplifier must be no longer than 30 m (when laid within a building) and
must not leave the building.

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CMA
HBMA2559−1.0en/de/fr
Maintenance
The CMA charge amplifier is maintenancefree.
Remaining dangers
The scope of supplyand performance of the charge amplifier covers onlya
small area of measurement technology. In addition, equipment planners,
installers and operators should plan, implement and respond to the safety
engineering considerations of measurement technologyin such a wayas to
minimize 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 anycontrols that maybe
connected remain in safe condition until the switching performance of the
amplifier system has been tested.
Remaining dangers are indicated in these Mounting Instructions bythe
following symbols:
Symbol: WARNING
Meaning: Dangerous situation
Warns of a potentially dangerous situation in which failure to complywith
safetyrequirements can result in death or serious physical injury.
Symbol: ATTENTION
Meaning: Possibly dangerous situation
Warns of a potentiallydangerous situation in which failure to complywith
safetyrequirements couldresult in damage to propertyor some form of
physical injury.
Symbol: NOTE
Means that important information about the product or its handling is being
given.
Symbol:

6CMA
HBM A2559−1.0en/de/fr
Meaning: CE mark
The CE mark enables the manufacturer to guarantee that the product
complies with the requirements of the relevant ECdirectives (the Declaration
of Conformitycan be found at http://www.hbm.com/HBMdoc).
Symbol:
Meaning: Statutory waste disposal mark
In accordance with national and local environmental protection and material
recoveryand recycling regulations, old devices that can no longer be used
must be disposed of separatelyand not with normal household garbage.
If you need more information about waste disposal, please contact your local
authorities or the dealer from whom you purchased the product.
In accordance with national and local environmental protection and material
recoveryand recycling regulations, old devices that can no longer be used
must be disposed of separatelyand not with normal household garbage.
If you need more information about waste disposal, please contact your local
authorities or the dealer from whom you purchased the product.
Conversions andmodifications
The charge amplifier must not be modified from the design or safety
engineering point of view except with our express agreement. Any
modification shall exclude all liabilityon our part for anydamage resulting
therefrom.
In particular, anyrepair or soldering work on motherboards is prohibited.
When exchanging complete modules, use onlyoriginal parts from HBM.
The product is delivered from the factorywith a fixed hardware and software
configuration. Changes can onlybe made within the possibilities documented
in the manuals.
Qualifiedpersonnel
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 onlyto be installed and used byqualified personnel strictlyin
accordance with the specifications and with the safetyrules and regulations
which follow.
This includes people who meet at least one of the three following
requirements:

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CMA
HBMA2559−1.0en/de/fr
•Knowledge of the safetyconcepts of automation technologyis a
requirement and as project personnel, you must be familiar with these
concepts.
•As automation plant operating personnel, you have been instructed how to
handle the machineryand 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 qualifyyou to repair the automation systems. You
are also authorized to activate, to ground and label circuits and equipment
in accordance with safetyengineering standards.
It is also essential to complywith the legal and safetyrequirements for the
application 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 bytrained personnel who are aware of the dangers involved.

8CMA
HBM A2559−1.0en/de/fr
1Scope of supply
Ordernumber
1−CMA39 Singlechannel charge amplifier for piezoelectric sensors,
measuring range 39500 mpC
1−CMA158 Singlechannel charge amplifier for piezoelectric sensors,
measuring range 158300 mpC
1−CMA210 Singlechannel charge amplifier for piezoelectric sensors,
measuring range 210500 mpC
1−CMA287 Singlechannel charge amplifier for piezoelectric sensors,
measuring range 287000 mpC
1−CMA482 Singlechannel charge amplifier for piezoelectric sensors,
measuring range 482000 mpC
Tobe orderedseparately:
1−KAB168−5 8wire cable to the processing electronics,
M12 x 1 cable plug, 5 m long, free ends
1−KAB168−20 8wire cable to the processing electronics,
M12 x 1 cable plug, 20 m long, free ends
1−KAB143−3Connection cable, coaxial, 3 m long
2Application instructions
Piezoelectric charge amplifiers of the CMA type series are suitable for
measuring with piezo sensors. Because theyprovide highlyaccurate dynamic
and quasistatic force measurements, theymust be handled verycarefully.
The compact design amplifiers have good immunityfrom interference.
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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CMA
HBMA2559−1.0en/de/fr
3Conditions on site
ATTENTION
The insulation resistance is crucial for piezoelectric transducers; it
should be no greater than 1013 ohms. To obtain this value , all the
plug connections have to be kept thoroughlyclean. 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 transducerplug andthe charge amplifier
transducerconnector against pollution andunderno
circumstances touch it (plug face) with yourhand. The
suppliedcovershouldalways be in place when the
connection is not in use.
Use onlythe 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
measurement results, the nominal (rated) temperature range must be
observed. Temperaturerelated measurement errors are caused byheating on
one side (e.g. radiant heat) or bycooling.
3.2 Moisture andhumidity
Moisture and humidityor a tropical climate are to be avoided. When the
connection cable is properlyconnected to a transducer/charge amplifier, the
CMA charge amplifier has degree of protection IP65 per EN 60529.

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HBM A2559−1.0en/de/fr
4Mounting
The charge amplifier can be mounted with two M3 screws.
The signal inputs and outputs are electricallyisolated from the housing and
the CMA. So noisolating elements are necessary.
The CMA can be mounted in anyposition.
57
46
34.8
4
30.8
4
Mounting
example
Metal
M3M3

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CMA
HBMA2559−1.0en/de/fr
5 Electrical connection
Onlyhighinsulation connection cables that generate little friction electricity
must be used for piezoelectric sensors.
CMA charge amplifier
Example:
CFT piezoelectric force
transducer
Charge amplifier
transducer cable
Bending radius of the connection cable: R= 9,75 mm
The supplyvoltage, 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 direct voltage operation (18 to 30
V). The circuit is intended for operating with separated extralow voltage
(SELV circuit).
1
2
4
Supplyvoltage 0 V (GND).. . . . . . . . .
Output signal −10 ... +10 V.. . . . . . . . . . . . . . .
RANGE 1 / RANGE 2.. . . . . . . . . . . . . . . . . . . . .
TEDS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MEASURE / RESET . . . . . . . . . . . . . . . . . . . . .
5
white
brown
green
yellow
gray
3Connection cable
wire
assignments,
Kab 168
6
7
8
Signal ground . . . . . . . . . . . . . . . . . . . . . . . . . . .
Do not assign !.. . . . . . . . . . . . . . . . . . . . . . . . . .
Supplyvoltage 18 −30 V DC1)
pink
blue
red
M12 x 1, 8pin
1)Operating on a SELV circuit (safetyextra−low voltage)
Fig.5.1 PIN assignment

12 CMA
HBM A2559−1.0en/de/fr
NOTE
The cable shieldmust not be connectedtothe downstream
evaluating electronics. PIN 7 is exclusively for use within
HBM andmust not be assigned.
NOTE
If a sensor has groundinsulation or if there is an electrically
isolatedfeed, we recommendgrounding the charge amplifier
housing.

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CMA
HBMA2559−1.0en/de/fr
6Structure andprinciple of operation
The CMA charge amplifier is connected to a transducer for signal
conditioning. The CMA amplifies the electric charges to a proportional output
signal of −10 to +10 VDC (see the test certificate for accurate data).
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 6.1.
e.g. CFT piezoelectric
force transducer CMA charge amplifier
Supplyvoltage
18 −30 VDC
RANGE 1 / RANGE 2
MEASURE / RESET
Output voltage
−10 to +10 VDC
TEDS
0 VDC
0 VDC
Fig.6.1 Block diagram of the CMA measuring chain
MEASURE / RESET
With an input voltage of 0 V at PIN MEASURE/RESET, the charge amplifier is
in the MEASURE measurement mode. If a voltage of 24 V is present at PIN
MEASURE / RESET, the charge amplifier switches to RESET.
Setting RESET will set the amplifier output signal to zero. This can be done
with anyapplied 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.

14 CMA
HBM A2559−1.0en/de/fr
10 V
RESET
0% 80%
0 V
2 V
−8V
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉ
OVERLOADRANGE
Removal of
force
100% Fnom
Fig.6.2 Reset function
ATTENTION
AfterRESET, although the charge amplifieroutput is set to
zero, this does not mean that the machine generating the
force is forcefree.
Make sure that the force transduceris not overloaded, even
though the output signal is still in the −10 to+ 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 toreset again.

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CMA
HBMA2559−1.0en/de/fr
RANGE1 / RANGE 2
If a voltage of 0 V is present at PIN RANGE1/RANGE2, 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 VDC must be applied at PIN
RANGE1/RANGE for this.
10 V
2 V
0 V0V
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 safetyreserves for measurement tasks where overload is
critical. The charge amplifier overloads above 20%.

16 CMA
HBM A2559−1.0en/de/fr
The supplyvoltage and the RANGE1 / RANGE2 and MEASURE / RESET
control inputs are electricallyisolated from the measuring circuit.
ATTENTION
If eitherthe transduceror the charge amplifierare replaced,
calibration is nolongervalid. Incorrect measuredvalues
couldbe displayedand/or forwardedtodownstream
evaluating electronics.
The data storedin TEDS are only validfor the particular
twopart measuring chain (see Section 6.3). The data of the
TEDS chipmay have tobe changedor rewritten.
6.1 TEDS transduceridentification
TEDS stands for "Transducer Electronic Data Sheet". An electronic data sheet
per the IEEE 1451.4 standard is stored in the charge amplifier of the
piezoelectric measurement chain, making it possible for the downstream
evaluating electronics to be set up automatically. The suitablyequipped
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 automaticallymakes the valid TEDS
information available as well.
TEDS has to be reimported bythe 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 byMaxim/Dallas.
Content of TEDS memory perIEEE 1451.4:
The information in the TEDS memoryis organized into templates which are
prestructured to store defined groups of data in table form. Onlythe entered
values are stored in the TEDS memoryitself.
The amplifier firmware assigns the interpretation of the respective numerical
values. This places a verylow demand on the TEDS memory.

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CMA
HBMA2559−1.0en/de/fr
The memorycontents are divided into four areas:
Area 1:
An internationallyunique 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 bythe manufacturer are contained in this area:
These specify
−the transducer type,
−the measurand,
−the electrical output signal,
−the required excitation.
HBM has alreadydescribed the High Level Voltage template for the CMA
piezoelectric charge amplifier.

18 CMA
HBM A2559−1.0en/de/fr
Example:
Charge amplifier and 20 kN force transducer.
Content written byHBM, on the basis of the individual test certificate: Area 3
of the CMA20kN charge amplifier with identification no. 123456, made by
HBM on 27.6.2007.
Template: High Level Voltage
ParameterValue 1) Unit Change
requires
rights to
level:
Explanation
Transducer electrical
signal type Sensor voltage ID
Minimum force/weight 0.000 N CAL The physical measurand and unit
are defined when the template is
created, after which theycannot
be changed.
Maximum force/weight 20.000k N CAL
Minimum electrical
value 0.00000 V/V CAL The difference between these
values is the sensitivityaccording
to the HBM test certificate or from
calibration1).
Maximum electrical
value +9.5700 V/V CAL
Mapping method Linear This entrycannot be changed.
ACor DC coupling DC ID
Output impedance of
the sensor 10.0 Ohm IDOutput resistance according to the HBM data sheet.
Response time 1.0000000u sec IDOf no significance for HBM
transducers.
Excitation level
(nominal) 24.0 V IDSupplyvoltage according to the HBM data sheet.
Excitation level
(minimum) 18.0 V IDLower limit for the operating range of the supplyvoltage according to
the HBM data sheet.
Excitation voltage type DC IDType of supplyvoltage
Max. current draw at
nominal excitation level 50.12m A IDMaximum supplycurrent
1) Typical values for the CFT/20kN force transducer

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CMA
HBMA2559−1.0en/de/fr
ParameterValue 1) Unit Change
requires
rights to
level:
Explanation
Calibration date 27−Jun−2007 CAL Date of the last calibration or
creation of the test certificate (if
no calibration carried out), or of
the storage of the TEDS data (if
onlynominal (rated) values from
the data sheet were used).
Format: day−month−year.
Abbreviations for the months: Jan,
Feb, Mar, Apr, May, Jun, Jul, Aug,
Sep, Oct, Nov, Dec.
Calibration initials HBM CAL Initials of the calibrator or
calibration laboratoryconcerned.
Calibration period
(days) 0 daysCAL Time before recalibration, calculated from the date specified
under Calibration Date.
Measurement location
ID
0USRIdentification number for the
measuring point. Can be assigned
according to the application.
Possible values: a number from 0
to 2047. If that is not enough, the
HBM Channel Comment template
can also be used for this purpose.
1) Typical values for the CFT/20kN force transducer
For more extensive information about TEDS, look in the TEDS Operating
Manuals on the Internet at www.hbm.com/TEDS

20 CMA
HBM A2559−1.0en/de/fr
6.2 Replacement
When replacement is necessary, in principle, both the piezoelectric transducer
and the charge amplifier can be replaced.
Example:
Onlyever replace a CFT/5KN force transducer with a CFT/5kN one, or a
CMA39 charge amplifier with a CMA39 one. This ensures that there are the
same levels of sensitivityat the charge amplifier.
Charge amplifiers are adjusted individually. This ensures that when the
amplifier is replaced, the series variation is < "0.5%.
If the charge amplifier is not deployed as a measuring chain, TEDS is not
described.
ATTENTION
Replacing one of the components makes the information in
TEDS nolongervalid. But it is possible, by means of the
values specifiedin the calibration certificate, towrite the
requiredvalidvalues toTEDS.
To do this, you must have write authorization for writing to TEDS and have the
relevant hardware and software available.
The correct output span can be calculated bysimple multiplication from the
characteristic values of the charge amplifier and force transducer components
( see additional information in the test certificate ).
Example:
CFT/20kN force transducer sensitivity−7.779 pC/N
CMA158 charge amplifier sensitivity−0.064 mV/pC
Output span Ua[V] = working force [N] x (force transducer sensitivity[pC/N]) x
(charge amplifier sensitivity[mV/pC]) /1000
Output span:
Ua= 20000 N x (−7.779 pC/N) x (−0.064 mV/pC) /1000= 9.957 V