HBM PWSE User manual
A3361-1.0 en/de/fr
Single point load cells
Plattformwägezellen
Pesons plateforme
PWSE
Mounting Instructions
Montageanleitung
Notice de montage
English Page 3 ... 13................................................
Deutsch Seite 14 ... 24..............................................
Français Page 25 ... 32..............................................
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PWSE
A3361-1.0 en/de/fr HBM
Contents Page
English
Safety instructions 4..............................................
1 Markings used 7...............................................
1.1 Symbols on the load cell 7..................................
1.2 The markings used in this document 7........................
2 Conditions on site 8...........................................
2.1 Protection against corrosion 8...............................
2.2 Deposits 8................................................
3 Mechanical installation 9.......................................
3.1 Important precautions during installation 9....................
3.2 Mounting 9...............................................
4 Electrical connection 11.........................................
4.1 Connection with six‐wire configuration 11......................
4.2 Connection with four‐wire configuration 11.....................
4.3 Shortening the cable 12.....................................
4.4 Cable extension 12.........................................
4.5 EMC protection 12..........................................
5 Specifications 14...............................................
6 Dimensions 15.................................................
PWSE
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A3361-1.0 en/de/frHBM
Safety instructions
Proper use
Load cells of the PWSE type series are designed for technical weighing
applications 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.
Loading 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.:
Limit load
Limit load at max. eccentricity
Limit lateral loading
Breaking loads
Temperature limits
Limits 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.
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.
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PWSE
A3361-1.0 en/de/fr HBM
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, over
load 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
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,
equipment 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.
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.
PWSE
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A3361-1.0 en/de/frHBM
Maintenance
The PWSE load cells are maintenance free.
Selling on
If the load cell is sold on, these mounting instructions must be included with
the load cell.
Environmental protection, 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 waste.
If you need more information about waste disposal, please contact your local
authorities 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 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. You 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, ground and label circuits and equipment in
accordance with safety engineering standards.
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A3361-1.0 en/de/fr HBM
1 Markings used
1.1 Symbols on the load cell
Symbol:
Meaning: CE mark
The CE mark enables the manufacturer to guarantee that the product com
plies with the requirements of the relevant EC directives (the Declaration of
Conformity can be found on the HBM website at www.hbm.com under
Support -> HBMdoc).
1.2 The markings used in this document
The marking below warns of a potentially dangerous situation in which failure
to comply with safety requirements can result in death or serious physical
injury.
WARNING
Description of a potentially dangerous situation
Measures to avoid/prevent the danger
The marking below warns of a situation in which failure to comply with safety
requirements could lead to damage to property.
NOTE
Description of a situation that could lead to damage to property
The marking below draws your attention to important information about the
product or about handling the product.
Important
Important information
PWSE
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A3361-1.0 en/de/frHBM
2 Conditions on site
The PWSE series load cells reach the protection class IP67.
2.1 Protection against corrosion
The load cells must be protected against chemicals that could attack the
transducer body (stainless) steel or the cable.
NOTE
Acids and all substances that release ions also attack stainless steels and
their welded seams.
Should there be any corrosion, this could cause the transducer to fail. In this
case, appropriate protective measures should be implemented.
2.2 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate suffi
ciently to divert some of the measuring force onto the housing, thus invalidat
ing the measured value (force shunt).
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PWSE
A3361-1.0 en/de/fr HBM
3 Mechanical installation
3.1 Important precautions during installation
Handle the transducer with care.
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 above and below the
transducer.
Make sure that the transducer cannot be 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
transducer is installed.
Implement appropriate safety measures to avoid overloads or to protect
against resulting dangers.
NOTE
Load cells are precision measuring elements and need to be handled care
fully. Dropping or knocking the transducer may cause permanent damage.
Make sure that the transducer cannot be overloaded, even while it is being
mounted.
3.2 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 Thread Min. property class Tightening torque*)
100 300kg M10 10.9 66Nm
500 750kg M12 10.9 115Nm
*) Recommended value for the specified property class. Please comply with the screw manufacturer's
instructions with regard to screw dimensions.
PWSE
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A3361-1.0 en/de/frHBM
= =
= =
Platform center
Load application
Connection cable
Mounting
Spacing disc
Fig.3.1: Load application and installation
Important
Load must not be applied to the side where the cable connection is located,
as this would cause a force shunt.
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