HBM PWS User manual

Mounting Instructions | Montageanleitung |
Montagehandleiding
English Deutsch Nederlands
PWS

Hottinger Brüel & Kjaer GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-0101.0062
DVS: A05750_02_XA0_00 HBM: public
07.2021
EHottinger Baldwin Messtechnik
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 dar.
Wijzigingen voorbehouden.
Alle gegevens in deze handleiding vormen een algemene
beschrijving van onze producten. Ze zijn geen garantie voor
de kwaliteit of houdbaarheid.

Mounting Instructions | Montageanleitung |
Montagehandleiding
English Deutsch Nederlands
PWS

2A05750_02_XA0_00 HBM: public PWS
English
1 Safety instructions 3........................................
2 Scope of supply and equipment variants 7...................
3 General application instructions 8...........................
4 Structure and mode of operation 9...........................
4.1 Transducer 9................................................
4.2 Strain gauge covering agent 9.................................
4.3 Disturbance variables 9.......................................
5 Conditions on site 10........................................
5.1 Ambient temperature 10.......................................
5.2 Moisture and corrosion protection 10............................
5.3 Deposits 10..................................................
6 Mechanical installation 11....................................
6.1 Important precautions during installation 11......................
6.2 General installation guidelines 11...............................
6.3 Mounting 12..................................................
7 Electrical connection 14......................................
7.1 EMC protection 14............................................

Safety instructions
PWS A05750_02_XA0_00 HBM: public 3
1 Safety instructions
Intended use
Load cells of the PWS type series are designed for technical weighing applica
tions within the load limits detailed in the specifications. Any other use is not
the designated use.
The load cells may only be installed by qualified personnel in compliance with
the specifications and with the safety requirements and regulations of these
mounting instructions. It is also essential to observe the applicable legal and
safety regulations for the application concerned. The same applies to the use
of accessories.
Load cells are not intended for use as safety components. Please also refer to
the section: “Additional safety precautions". Proper and safe operation of the
load cells requires proper transportation, correct storage, siting and mounting,
and careful operation.
Load-carrying capacity limits
The data in the technical data sheet must be complied with when using the
load cells. In particular, the respective maximum loads specified must never be
exceeded. The following limits set out in the specifications must not be
exceeded, e.g.:
SLimit load
SLimit load at max. eccentricity
SLimit lateral loading
SBreaking loads
STemperature limits
SLimits of electrical loading capacity
Note that, when several load cells are installed in a scale, there is not always
an even distribution of load on the individual load cells.

Safety instructions
4A05750_02_XA0_00 HBM: public PWS
Use as a machine element
The load cells can be used as machine elements. When used in this manner, it
must be noted that, to favor greater sensitivity, the load cell is not designed
with the safety factors usual in mechanical engineering. Please refer here to
the section “Loading capacity limits" and to the specifications.
Accident prevention
The prevailing accident prevention regulations must be taken into account,
even though the maximum capacity values in the destructive range are well in
excess of the full scale value.
Additional safety precautions
Load cells cannot (as passive transducers) implement any (safety‐relevant)
cutoffs. This requires additional components and constructive measures for
which the installer and operator of the plant is responsible.
In cases where a breakage or malfunction of the load cells would cause injury
to persons or damage to equipment, the user must take appropriate additional
safety measures that meet at least the requirements of applicable safety and
accident prevention regulations (e.g. automatic emergency shutdown, overload
protection, catch straps or chains, or other fall protection).
The layout of the electronics conditioning the measurement signal should be
such that measurement signal failure does not cause damage.
General dangers of failing to follow the safety instructions
Load cells are state‐of‐the‐art and reliable. Transducers can give rise to resid
ual dangers if they are incorrectly operated or inappropriately mounted,
installed and operated by untrained personnel. Everyone involved with siting,
starting up, operating or repairing a load cell must have read and understood
the Mounting Instructions and in particular the technical safety instructions. The
load cells can be damaged or destroyed by non‐designated use of the load
cells or by non‐compliance with the mounting and operating instructions, these
safety instructions or any other applicable safety regulations (BG safety and
accident prevention regulations) when using the load cells. Load cells can
break, particularly in the case of overloading. The breakage of a load cell can

Safety instructions
PWS A05750_02_XA0_00 HBM: public 5
also cause damage to property or injury to persons in the vicinity of the load
cell.
If load cells are not used according to their designated use, or if the safety
instructions or specifications in the mounting and operating instructions are
ignored, it is also possible that the load cells may fail or malfunction, with the
result that persons or property may be affected (due to the loads acting on or
being monitored by the load cells).
The scope of supply and performance of the transducer covers only a small
area of weighing technology, as measurements with (resistive) strain gauge
sensors presuppose the use of electronic signal processing. In addition, equip
ment planners, installers and operators should plan, implement and respond to
the safety engineering considerations of the weighing technology in such a way
as to minimize residual dangers. Pertinent national and local regulations must
be complied with.
The markings used in this document
Important instructions for your safety are specifically identified. It is essential to
follow these instructions in order to prevent accidents and damage to property.
Symbol Meaning
WARNING This marking warns of a potentially dangerous situa
tion in which failure to comply with the safety require
ments can result in death or serious physical injury.
Note This marking draws your attention to a situation in
which failure to comply with the safety requirements
can result in damage to property.
Emphasis
See …
Italics are used to emphasize and highlight text and
identify references to sections, diagrams, or external
documents and files.
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.

Safety instructions
6A05750_02_XA0_00 HBM: public PWS
Maintenance
The load cells of the PWS series are maintenance free.
Waste disposal
In accordance with national and local environmental protection and material
recovery and recycling regulations, old transducers that can no longer be used
must be disposed of separately and not with normal household garbage.
If you need more information about disposal, please contact your local authori
ties or the dealer from whom you purchased the product.
Qualified personnel
Qualified personnel means persons entrusted with siting, mounting, starting up
and operating the product who possess the appropriate qualifications for their
function.
This includes people who meet at least one of these three requirements:
SThey know about the safety concepts of automation and as project person
nel, are familiar with these concepts
SAs automation plant operating personnel, they have been instructed how to
handle the machinery. They are familiar with the operation of the equipment
and technologies described in this documentation.
SAs system startup engineers or service engineers, they have successfully
completed the training to qualify them to repair the automation systems.
They are also authorized to activate, ground and label circuits and equip
ment in accordance with safety engineering standards.
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 load cell may only be installed by qualified personnel, strictly in accor
dance with the specifications and with the safety requirements and regulations.

Scope of supply and equipment variants
PWS A05750_02_XA0_00 HBM: public 7
2 Scope of supply and equipment variants
SThe particular variant of the PWS load cell
SSafety instructions A05751

General application instructions
8A05750_02_XA0_00 HBM: public PWS
3 General application instructions
Load cells are suitable for measuring compressive forces. Because they pro
vide highly accurate static and dynamic force measurements, they must be
handled very carefully. Particular care must be taken when transporting and
installing the devices. Dropping and knocking the transducer may cause per
manent damage.
For information on the permissible limits for mechanical, thermal and electrical
stress, please see PWS data sheet.

Structure and mode of operation
PWS A05750_02_XA0_00 HBM: public 9
4 Structure and mode of operation
4.1 Transducer
The measuring body is an aluminum loaded member on which strain gauges
(SG) are installed. The influence of a force deforms the measuring body, so
there is deformation in places where the strain gauges are installed. For each
measuring circuit (measuring bridge), the strain gauges are attached so that
two are stretched and two are compressed. The strain gauges are wired to
form a Wheatstone bridge circuit. They change their ohmic resistance in pro
portion to their change in length and so unbalance the Wheatstone bridge. If
there is an excitation voltage, the circuit produces an output signal proportional
to the change in resistance and thus also proportional to the applied force. The
strain gauge arrangement is chosen to compensate, as much as possible, for
parasitic forces and moments (e.g. lateral forces and torques), as well as the
effects of temperature.
4.2 Strain gauge covering agent
To protect the strain gauges, the load cells have a silicone covering agent, that
offers good protection against environmental influences. In order to retain the
protective effect, the silicone covering agent must not be removed, or damaged
in any way.
4.3 Disturbance variables
Torsion, bending moment and lateral forces are disturbance variables that
affect measurement accuracy, and should therefore be avoided as much as
possible.

Conditions on site
10 A05750_02_XA0_00 HBM: public PWS
5 Conditions on site
Protect the sensor from weather conditions such as rain, snow, ice and salt
water.
5.1 Ambient temperature
The effects of temperature on the zero signal and on sensitivity are compen
sated.
To obtain optimum measurement results, the nominal (rated) temperature
range must be complied with. The strain gauge arrangement results in extreme
insensitivity to temperature gradients, due to the construction (radially symmet
ric shear force transducer). Nevertheless, constant or very slowly changing
temperatures are best. A radiation shield and all-round thermal insulation pro
duce noticeable improvements. However, they must not be allowed to set up a
force shunt, i.e. the slight movement of the force transducer must not be pre
vented.
5.2 Moisture and corrosion protection
Despite the careful encapsulation, it makes sense to protect the transducers
against permanent exposure to moisture. PWS series force transducers
achieve protection class IP67.Nevertheless, the force transducer must be pro
tected against permanent exposure to moisture.
The sensor must be protected against chemicals that could attack the alu
minum, potting material or cable.
Corrosion can cause the transducer to fail. A means of protection must be
devised if this danger exists.
5.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate suffi
ciently to conduct or load any of the measuring force around the transducer,
thus invalidating the measured value (force shunt).

Mechanical installation
PWS A05750_02_XA0_00 HBM: public 11
6 Mechanical installation
6.1 Important precautions during installation
SHandle the transducer with care.
SComply with the requirements for the force application parts, as specified in
sections 6.2 and 6.3.
SWelding 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 offers the highly flexible EEK
ground cable in various lengths for this purpose, which can be screwed on
above and below the transducer.
SMake sure that the transducer is not overloaded.
WARNING
There is a danger of the transducer breaking if it is overloaded. This can
cause danger for the operating personnel of the system in which the trans
ducer is installed, as well as for people in the vicinity.
Implement appropriate safeguards to avoid overloads or to protect against the
resulting dangers.
6.2 General installation guidelines
The forces to be measured must act on the transducer as accurately as possi
ble in the direction of measurement. Torques, bending moments resulting from
lateral force, eccentric loading and the lateral forces themselves, may produce
measurement errors and destroy the transducer, if limit values are exceeded.
Notice
Load cells are precision measuring elements and need to be handled carefully.
Dropping or knocking the transducer may cause permanent damage. Make
sure that the transducer cannot be overloaded, even while it is being mounted.

Mechanical installation
12 A05750_02_XA0_00 HBM: public PWS
6.3 Mounting
Attach the load cells at the mounting holes and apply the load to the other end.
The screws and tightening torques to be used are given in the following table:
Maximum capacity ABCTightening torque
100 … 300 kg 8.5 M8 23.8 32 Nm
500 … 750 kg 10.4 M10 36.5 79 Nm
= =
= =
Platform center
Load
application Connection cable
Mounting
Spacing disc
Fig. 6.1 Load application and installation

Mechanical installation
PWS A05750_02_XA0_00 HBM: public 13
Direction of measuring force
Important
Load must not be applied to the side where the cable connection is located, as
this would cause a force shunt.

Electrical connection
14 A05750_02_XA0_00 HBM: public PWS
7 Electrical connection
The PWS is a load cell that outputs a mV/V signal based on strain gauges. An
amplifier is needed to condition the signal. All DC amplifiers and carrier-
frequency amplifiers designed for SG measurement systems can be used.
Load cells are executed in a four-wire circuit. Compressive loading produces a
positive output signal.
The cable has different-colored cores, that are assigned as follows:
Input voltage + = blue
Input voltage - = black
Measurement signal + = white
Measurement signal - = red
Sensor cable + = green
Sensor cable - = gray
Shielding = yellow,
stranded connection wire insulated over full length
The connection cable shield is connected to the measuring body.
7.1 EMC protection
Electrical and magnetic fields can often induce interference voltages in the
measuring circuit. Pay attention to the following points to avoid this:
SUse only shielded, low-capacitance measurement cables (HBM measure
ment cables fulfill this condition) if it is necessary to extend the cable
SDo not route the measurement cable parallel to power lines and control
circuits. If this is not possible, protect the measurement cable with metal
tubing
SAvoid stray fields from transformers, motors and contact switches
SDo not ground transducers, amplifiers and indicators more than once,
SConnect all the devices in the measuring chain to the same protective earth
conductor.
SAlways connect the cable shield extensively on the amplifier side, to create
the best possible Faraday cage.

Mounting Instructions | Montageanleitung |
Montagehandleiding
English Deutsch Nederlands
PWS

2A05750_02_XA0_00 HBM: public PWS
Deutsch
1 Sicherheitshinweise 3......................................
2 Lieferumfang und Ausstattungsvarianten 8...................
3 Allgemeine Anwendungshinweise 9.........................
4 Aufbau und Wirkungsweise 10...............................
4.1 Aufnehmer 10................................................
4.2 DMSAbdeckung 10...........................................
4.3 Störgrößen 10................................................
5 Bedingungen am Einsatzort 11...............................
5.1 Umgebungstemperatur 11.....................................
5.2 Feuchtigkeits und Korrosionsschutz 11..........................
5.3 Ablagerungen 11.............................................
6 Mechanischer Einbau 12.....................................
6.1 Wichtige Vorkehrungen beim Einbau 12.........................
6.2 Allgemeine Einbaurichtlinien 12.................................
6.3 Montage 13..................................................
7 Elektrischer Anschluss 15....................................
7.1 EMVSchutz 15...............................................

Sicherheitshinweise
PWS A05750_02_XA0_00 HBM: public 3
1 Sicherheitshinweise
Bestimmungsgemäßer Gebrauch
Die Wägezellen der Typenreihe PWS sind für wägetechnische Anwendungen
im Rahmen der durch die technischen Daten spezifizierten Belastungsgrenzen
konzipiert. Jeder andere Gebrauch ist nicht bestimmungsgemäß.
Die Wägezellen dürfen nur von qualifiziertem Personal ausschließlich entspre
chend der technischen Daten unter Beachtung der Sicherheitsbestimmungen
und Vorschriften dieser Montageanleitung eingesetzt werden. Zusätzlich sind
die für den jeweiligen Anwendungsfall geltenden Rechts‐ und Sicherheitsvor
schriften zu beachten. Sinngemäß gilt dies auch bei Verwendung von Zubehör.
Die Wägezellen sind nicht zum Einsatz als Sicherheitsbauteile bestimmt. Bitte
beachten Sie hierzu den Abschnitt „Zusätzliche Sicherheitsvorkehrungen“. Der
einwandfreie und sichere Betrieb der Wägezellen setzt sachgemäßen
Transport, fachgerechte Lagerung, Aufstellung und Montage sowie sorgfältige
Bedienung voraus.
Belastbarkeitsgrenzen
Beim Einsatz der Wägezellen sind die Angaben in den technischen Datenblät
tern unbedingt zu beachten. Insbesondere dürfen die jeweils angegebenen
Maximalbelastungen keinesfalls überschritten werden. Nicht überschritten
werden dürfen z. B. die in den technischen Datenblättern angegebenen Werte
für
SGrenzlast
SGrenzlast bei max. Exzentrizität
SGrenzquerbelastung
SBruchlasten
STemperaturgrenzen
SGrenzen der elektrischen Belastbarkeit
Beachten Sie, dass beim Einbau mehrerer Wägezellen in eine Waage die Last
verteilung auf die einzelnen Wägezellen nicht immer gleichmäßig ist.

Sicherheitshinweise
4A05750_02_XA0_00 HBM: public PWS
Einsatz als Maschinenelemente
Die Wägezellen können als Maschinenelemente eingesetzt werden. Bei dieser
Verwendung ist zu beachten, dass die Wägezellen zu Gunsten einer hohen
Messempfindlichkeit nicht mit den im Maschinenbau üblichen Sicherheitsfakto
ren konstruiert wurden. Beachten Sie hierzu den Abschnitt „Belastbarkeitsgren
zen“ und die technischen Daten.
Unfallverhütung
Obwohl die angegebene Nennkraft im Zerstörungsbereich ein Mehrfaches vom
Messbereichsendwert beträgt, müssen die einschlägigen Unfallverhütungsvor
schriften der Berufsgenossenschaften berücksichtigt werden.
Zusätzliche Sicherheitsvorkehrungen
Die Wägezellen können (als passive Aufnehmer) keine (sicherheitsrelevanten)
Abschaltungen vornehmen. Dafür bedarf es weiterer Komponenten und kon
struktiver Vorkehrungen, für die der Errichter und Betreiber der Anlage Sorge
zu tragen hat.
Wo bei Bruch oder Fehlfunktion der Wägezellen Menschen oder Sachen zu
Schaden kommen können, müssen vom Anwender geeignete zusätzliche
Sicherheitsvorkehrungen getroffen werden, die zumindest den Anforderungen
der einschlägigen Unfallverhütungsvorschriften genügen (z. B. automatische
Notabschaltungen, Überlastsicherungen, Fanglaschen oder ‐ketten oder
andere Absturzsicherungen).
Die das Messsignal verarbeitende Elektronik ist so zu gestalten, dass bei Aus
fall des Messsignals keine Folgeschäden auftreten können.
Allgemeine Gefahren bei Nichtbeachten der Sicherheitshinweise
Die Wägezellen entsprechen dem Stand der Technik und sind betriebssicher.
Von den Aufnehmern können Gefahren ausgehen, wenn sie von ungeschultem
Personal oder unsachgemäß montiert, aufgestellt, eingesetzt und bedient
werden. Jede Person, die mit Aufstellung, Inbetriebnahme, Betrieb oder Repa
ratur einer Wägezelle beauftragt ist, muss die Montageanleitung und insbeson
dere die sicherheitstechnischen Hinweise gelesen und verstanden haben. Bei
nicht bestimmungsgemäßem Gebrauch der Wägezellen, bei Nichtbeachtung
der Montage‐ und Bedienungsanleitung, dieser Sicherheitshinweise oder sons