Siemens SIWAREX WL230 BB-S SA User manual

SIWAREX WL230
Load foot
SB-S CA
Manual
7MH5721-4GH10 (load foot 0.1 to 2 t)
7MH5721-4PH10 (load foot 2.5 to 5 t)
7MH5721-5AH10 (load foot 10 t)
06/2019
A5E47600142-AA
Introduction 1
Safety notes 2
Description 3
Application planning 4
Installing/mounting 5
Service and maintenance 6
Technical specifications 7
Dimension drawings 8
Certificates and approvals A

Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will be
used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to property
damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions. Qualified
personnel are those who, based on their training and experience, are capable of identifying risks and avoiding
potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended or
approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software described.
Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the information in this
publication is reviewed regularly and any necessary corrections are included in subsequent editions.
Siemens AG
Digital Industries
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E47600142
Ⓟ 06/2019 Subject to change
Copyright © Siemens AG 2019.
All rights reserved

Table of contents
1 Introduction...................................................................................................................................................5
1.1 Purpose of this documentation.................................................................................................5
1.2 Document history .....................................................................................................................5
1.3 Checking the scope of delivery ................................................................................................5
1.4 Security information .................................................................................................................5
1.5 Notes on warranty ....................................................................................................................6
2 Safety notes..................................................................................................................................................7
2.1 Prerequisites for safe use ........................................................................................................7
2.1.1 Improper device modifications .................................................................................................7
2.2 Requirements for special applications .....................................................................................7
3 Description....................................................................................................................................................9
3.1 SIWAREX WL230 SB-S CA design .........................................................................................9
3.2 Characteristics .........................................................................................................................9
4 Application planning ...................................................................................................................................11
4.1 Load cell dummies .................................................................................................................11
4.2 Lifting protection.....................................................................................................................11
4.3 Load pick-up...........................................................................................................................11
4.4 Overload protection................................................................................................................12
4.5 Guide elements ......................................................................................................................13
4.6 Grounding cable.....................................................................................................................15
5 Installing/mounting......................................................................................................................................17
5.1 Basic safety instructions.........................................................................................................17
5.2 General notes on mounting....................................................................................................18
5.3 Mounting the load foot............................................................................................................19
5.4 Check the scope of delivery ...................................................................................................20
5.5 Create bracket plate...............................................................................................................21
5.6 Screw the load cell to the load bearing implement.................................................................22
5.7 Installing the load foot in the load cell ....................................................................................23
5.8 Compensating differences in height.......................................................................................24
5.9 Checking the mounting ..........................................................................................................24
5.10 Screw on the grounding cable................................................................................................25
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5.11 Dismantling ............................................................................................................................25
6 Service and maintenance ...........................................................................................................................27
6.1 Care and maintenance of elastomer components .................................................................27
6.1.1 Environmental influences/storage ..........................................................................................27
6.1.2 Service life / Control ...............................................................................................................28
6.1.3 Cleaning .................................................................................................................................28
7 Technical specifications..............................................................................................................................29
8 Dimension drawings ...................................................................................................................................31
8.1 Dimension drawing of the load foot........................................................................................31
8.2 Dimension drawing of grounding cable ..................................................................................32
A Certificates and approvals ..........................................................................................................................33
A.1 Technical support...................................................................................................................33
Index...........................................................................................................................................................35
Table of contents
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Introduction 1
1.1 Purpose of this documentation
These instructions contain all information required to commission and use the device. Read the
instructions carefully prior to installation and commissioning. In order to use the device
correctly, first review its principle of operation.
The instructions are aimed at persons mechanically installing the device, connecting it
electronically, configuring the parameters and commissioning it, as well as service and
maintenance engineers.
1.2 Document history
The most important changes in the documentation when compared with the respective
previous edition are given in the following table.
Table 1-1 Editions
Edition Comment/Change
05/2019 Initial release
1.3 Checking the scope of delivery
1. Check the packaging and the delivered articles for visible damage.
2. Report any claims for damages immediately to the shipping company.
3. Retain the damaged parts until clarification.
4. Check the consignment by comparing your order with the shipping documents for
correctness and completeness.
1.4 Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens’ products and solutions constitute one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. Such systems, machines and components should only be connected
to an enterprise network or the internet if and to the extent such a connection is necessary and
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only when appropriate security measures (e.g. firewalls and/or network segmentation) are in
place.
For additional information on industrial security measures that may be implemented, please
visit
https://www.siemens.com/industrialsecurity.
Siemens’ products and solutions undergo continuous development to make them more secure.
Siemens strongly recommends that product updates are applied as soon as they are available
and that the latest product versions are used. Use of product versions that are no longer
supported, and failure to apply the latest updates may increase customer’s exposure to cyber
threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under
https://www.siemens.com/industrialsecurity.
1.5 Notes on warranty
The contents of this manual shall not become part of or modify any prior or existing agreement,
commitment or legal relationship. The sales contract contains all obligations on the part of
Siemens as well as the complete and solely applicable warranty conditions. Any statements
regarding device versions described in the manual do not create new warranties or modify the
existing warranty.
The content reflects the technical status at the time of publishing. Siemens reserves the right
to make technical changes in the course of further development.
Introduction
1.5 Notes on warranty
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Safety notes 2
2.1 Prerequisites for safe use
This device left the factory in good working condition. In order to maintain this status and to
ensure safe operation of the device, observe these instructions and all the specifications
relevant to safety.
Observe the information and symbols on the device. Do not remove any information or symbols
from the device. Always keep the information and symbols in a completely legible state.
2.1.1 Improper device modifications
WARNING
Improper device modifications
Risk to personnel, system and environment can result from modifications to the device,
particularly in hazardous areas.
● Only carry out modifications that are described in the instructions for the device. Failure to
observe this requirement cancels the manufacturer's warranty and the product approvals.
2.2 Requirements for special applications
Due to the large number of possible applications, each detail of the described device versions
for each possible scenario during commissioning, operation, maintenance or operation in
systems cannot be considered in the instructions. If you need additional information not
covered by these instructions, contact your local Siemens office or company representative.
Note
Operation under special ambient conditions
We highly recommend that you contact your Siemens representative or our application
department before you operate the device under special ambient conditions as can be
encountered in nuclear power plants or when the device is used for research and development
purposes.
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Safety notes
2.2 Requirements for special applications
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Description 3
3.1 SIWAREX WL230 SB-S CA design
The self-aligning load foot for SIWAREX WL230 SB-S CA load cells is particularly suitable for
installation in platform and bin scales.

①Load bearing
②Load cell
③Locknut
④Ball joint with pendulum function
⑤Lower part with rubber cap
⑥Mounting screws
⑦Bracket plate
Figure 3-1 Load foot and load cell and load bearing implement
3.2 Characteristics
The load foot has the following characteristics:
● Easy installation of the load cell
● Self-aligning effect on the load bearing implement
● Height compensation via screw thread
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Description
3.2 Characteristics
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Application planning 4
4.1 Load cell dummies
Load cells are sensitive sensors. To protect the load cells from becoming damaged during
installation and transport, install the load cells only at the last minute. Replace the load cells
during installation and transport with placeholders, so-called dummies or phantoms.
4.2 Lifting protection
The following figure shows a proposed solution for lifting protection. The X designates the
possible lifting path of the load bearing implement. The bore ØD must be larger than the
diameter of the bolt Ød. The movement of the load bearing implement must not be hindered.
'G
;
Figure 4-1 Proposed solution for lifting protection
4.3 Load pick-up
Mounting surfaces
The following requirements apply to the installation areas:
● The positional and angular deviations of the mounting areas to each other correspond to the
general tolerances for welded constructions in EN ISO 13920.
● Ensure that the foundations are absolutely firm and free of depressions. Mount the
installation elements in concrete foundations on evenly cast steel plates.
● The mounting surfaces must be vertical to the measuring direction and preferably in one
plane.
● A plane of ≤ 0.2 mm is required for the mounting surfaces.
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More than three support points
For more than three support points, the load bearing implement is usually statically
indeterminate. With firm foundations and load bearing implements, the load is not evenly
distributed to all load cells. The same applies to unstable mounts such as a steel construction.
Two diagonal load cells bear the main load. The other load cells only support the load bearing
implement.
There are two ways to take this into consideration:
● Over-dimensioning of the load cells
● Height compensation of the support points
Over-dimensioning of the load cells
The rated load of the load cells is calculated such that with, for example, four support points the
entire weight can be borne by two load cells.
This also prevents an overload of the load cells if depressions in the foundation have to be
taken into consideration, e.g. for racks in the steel structure.
Height compensation of the support points
The output signals of the individual load cells correspond to the load distribution.
Compensate for the differences in height as described in the section Compensating differences
in height (Page 24).
4.4 Overload protection
NOTICE
Irreparable faults and damage to the load cells
If load cells are used beyond the maximum working load or the maximum transverse load, this
can cause irreparable faults and even fracturing of the load cell or the compact mounting unit.
● When using load cells with small rated loads, always provide overload protection in order
to protect the load cells from becoming damaged. You need overload protection for both
the measuring direction and the transverse direction.
Overload protection in the measuring direction
You protect load cells against vertical overload by placing a stop screw under the point where
force is introduced. The stop screw limits the measuring path of the load cell.
For load cells with high rated loads, the risk of an unintentional overload is not as great. Take
into consideration possible additional loads when dimensioning the load cells.
Another method for protecting load cells from an overload is to over-dimension the load cells.
Application planning
4.4 Overload protection
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Overload protection in the transverse direction
For the load cells with a load foot, the weight force is introduced into the load cells via bearing
surfaces. Up to a certain degree, these bearing surfaces allow lateral movement of the load
bearing implement or a change in its length as a result of expansion due to heat. They generate
a restoring force corresponding to the deflection, which re-centers the load bearing implement.
This freedom of movement is desired and necessary for accurate weighing.
If the transverse force is so great that it exceeds the restoring force of the bearing unit and thus
the deflection limit, appropriate protective measures are required. Pendulum limiters or guide
elements are suitable for this, for example.
Set the pendulum limiters in such a way that the maximum deflection is not exceeded in any
direction. The figure below shows the overload protection in the transverse direction using two
examples.
6WRS+ROH%ROW3ODWIRUP3ODWIRUPs
s
s
s

Figure 4-2 Pendulum limitation with a maximum deflection of 4 mm as exemplified by two weighing
platforms
4.5 Guide elements
Use the guide elements in the following cases:
● A weight should be determined under the influence of transverse forces.
● Horizontal movement of the load bearing implement should be prevented.
A change in the distance between the support points, for example, as a result of expansion of
the load bearing implement due to heat, must not lead to mutual tensioning of the guide
elements.
The following figure shows the ideal arrangement of guide elements.
Application planning
4.5 Guide elements
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Figure 4-3 Arrangement of guide elements
To ensure that no force components occur in the measuring direction, you must install guide
elements at precise right angles to the effective direction of the load cells.
Three guide elements are sufficient to statically fix a weighing platform or container.
Note
Weighing errors
With four guide elements, there is a risk of the guide elements mutually tensioning, which in turn
induces weighing errors. If you nevertheless want to use four guide elements, the guide
elements must be installed with a sufficient amount of play.
Application planning
4.5 Guide elements
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Ensure that the guide elements to be used comply with the principles applicable to weighing
technology.
4.6 Grounding cable
The grounding cable is used to protect the load cells from undesired currents. The causes of
such currents are, for example:
● Equalizing currents with missing or faulty equipotential bonding conductors
● A lightning strike nearby
● Welding work
● Static charge
Application planning
4.6 Grounding cable
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Application planning
4.6 Grounding cable
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Installing/mounting 5
5.1 Basic safety instructions
WARNING
Falling loads
Risk to life! Load cells are not machine components which have been constructed with the
normal safety factors.
● Install fall protection or disaster protection according to the potential risk.
● Lift the load bearing implement using suitable hoisting equipment.
NOTICE
Improper handling of the load cell
The load cell can be damaged when being handled improperly. Load cells are precision
components.
● Observe the operating instructions for the load cell. SIWAREX WL200 Operating
instructions (https://support.industry.siemens.com/cs/ww/en/view/109749190)
● Do not drop the load cell.
● Protect the load cells from shocks.
● Do not carry the load cell by its connecting cables.
● Do not damage any cables of the connecting cables.
● Do not damage any cables of the load cell.
● As long as the installation work on the scale structure is not completed, replace the load
cells with dummies. Load cell dummies (Page 11)
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NOTICE
Incorrect assembly of the load cell
Damaging of load cells, installation parts or load bearing implement
With load cells of smaller rated loads, there is a risk of stretching the load cell bodies when
attaching force transfer devices, e.g. when tightening locknuts.
Torsional and bending moments, eccentric loads and transverse loads are disturbance
variables. These disturbance variables cause errors in the measuring result and can damage
the load cells and compact mounting units if the maximum limits are exceeded.
● To ensure safe use of the hoisting gear, provide indented claws or crane eyebolts on the
load bearing implement.
● Do not overload the load cells.
● Put the load bearing implement down slowly.
● Use overload protection that securely absorbs the desired loads. The overload protection
permits a rise in weight unhindered until the setpoint weight is reached.
● Introduce the load in the measuring direction of the load cell.
● The mounting components normally allow so much room for movement that heat
expansion will not result in lateral loading.
NOTICE
Incorrect welding
Incorrect welding can damage the load cell.
● Do not conduct the welding current over the load cells.
– Attach the grounding clamp of the welding unit making reliable contact close to the weld.
– Bridge the load cells with a highly flexible grounding cable. See the section Grounding
cable (Page 15).
– Disconnect the individual load cells.
NOTICE
Missing grounding of the load cell
Undesirable electrical currents can arise during lightning and damage the load cell.
● Bridge the load cells with highly flexible grounding cables. See the section Screw on the
grounding cable (Page 25).
5.2 General notes on mounting
The installation conditions vary widely. The dead load of the load bearing implement can be
very low or relatively high. You might be dealing with a container, platform or a roller table. The
following installation instructions therefore only describe the general procedures.
To protect the load cells from damage during installation, always set up the load bearing
implement on dummies.
Installing/mounting
5.2 General notes on mounting
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Depending on the installation conditions, the detailed procedure deviates from the following
description.
5.3 Mounting the load foot
Introduction
In this section, you will learn how to mount the load foot step-by-step.
Before you start, note the following safety information:
● General safety information (Page 7)
● Basic safety information: Installation (Page 17)
For optimum performance of the load foot, read the complete equipment manual.
Procedure
1. Check the scope of delivery for the load foot:
Check the scope of delivery (Page 20)
2. Create a bracket plate.
Create bracket plate (Page 21)
3. Screw the load cell to the load bearing implement upside down.
Screw the load cell to the load bearing implement. (Page 22)
4. Install the load foot in the load cell.
Installing the load foot in the load cell (Page 23)
5. Compensate for the differences in height:
Compensating differences in height (Page 24)
6. Check the mounting.
Checking the mounting (Page 24)
7. Fasten the grounding cable.
Screw on the grounding cable (Page 25)
Installing/mounting
5.3 Mounting the load foot
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5.4 Check the scope of delivery

①Load foot
②Locknut
Figure 5-1 Product package
Installing/mounting
5.4 Check the scope of delivery
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