Siemens SIWAREX WL230 BB-S SA User manual

SIWAREX WL230
Base plate and elastomer bearing
BB-S SA
Operating Instructions
7MH4133-3DE11 (10 to 200 kg)
7MH5706-0PC00 (350 to 500 kg)
03/2020
A5E47358100-AA
Introduction 1
Description 2
Application planning 3
Installation 4
Service and maintenance 5
Technical specifications 6
Dimension drawings 7
Ordering data 8
Product documentation and
support 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: A5E47358100
Ⓟ 03/2020 Subject to change
Copyright © Siemens AG 2020.
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 consignment.......................................................................................................6
1.4 Product package for base plate ...............................................................................................6
1.5 Scope of delivery for elastomer bearing 350 to 500 kg............................................................7
1.6 Scope of delivery for elastomer bearing 10 to 200 kg..............................................................7
1.7 Security information .................................................................................................................8
1.8 Notes on warranty ....................................................................................................................8
2 Description....................................................................................................................................................9
2.1 Application................................................................................................................................9
2.1.1 Base plate and elastomer bearing ...........................................................................................9
2.1.2 Use of the grounding cable ......................................................................................................9
2.2 Design ......................................................................................................................................9
2.2.1 Design of base plate and elastomer bearing............................................................................9
2.2.2 Design of the grounding cable ...............................................................................................10
2.3 Functionality of elastomer bearing unit and grounding cable.................................................10
3 Application planning ...................................................................................................................................13
3.1 Load cell dummies .................................................................................................................13
3.2 Lifting protection.....................................................................................................................13
3.3 Load pick-up...........................................................................................................................14
3.4 Overload protection................................................................................................................15
3.5 Guide elements ......................................................................................................................16
3.6 Grounding cable.....................................................................................................................17
4 Installation ..................................................................................................................................................19
4.1 Safety instructions..................................................................................................................19
4.2 Installing the base plate and elastomer bearing.....................................................................21
4.2.1 General installation information..............................................................................................21
4.2.2 Overview ................................................................................................................................21
4.2.3 Preparing the load cell ...........................................................................................................22
4.2.4 Preparing the base plate and elastomer bearing ...................................................................22
4.2.5 Mounting the elastomer bearing unit......................................................................................22
4.2.6 Install the load cell with elastomer bearing unit......................................................................23
4.2.7 Set overload protection ..........................................................................................................25
4.2.8 Compensation of height with four or more support points......................................................25
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4.2.9 Checking the installation ........................................................................................................26
4.2.10 Installing the grounding cable ................................................................................................26
4.3 Dismantling ............................................................................................................................27
5 Service and maintenance ...........................................................................................................................29
5.1 Servicing and maintenance....................................................................................................29
5.2 Care and maintenance of elastomer components .................................................................30
6 Technical specifications..............................................................................................................................33
7 Dimension drawings ...................................................................................................................................35
7.1 Dimension drawing of base plate and elastomer bearing ......................................................35
7.2 Dimension drawing of grounding cable ..................................................................................36
8 Ordering data..............................................................................................................................................39
8.1 Accessories............................................................................................................................39
A Product documentation and support...........................................................................................................41
A.1 Product documentation ..........................................................................................................41
A.2 Technical support...................................................................................................................41
Index...........................................................................................................................................................43
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.
See also
Operating instructions SIWAREX WL200 load cells (https://
support.industry.siemens.com/cs/ww/en/view/109749190)
1.2 Document history
The most important changes in the documentation when compared with the respective
previous edition are given in the following table.
Manual edition Note
03/2020 Initial release
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1.3 Checking the consignment
1. Check the packaging and the delivered items for visible damages.
2. Report any claims for damages immediately to the shipping company.
3. Retain damaged parts for clarification.
4. Check the scope of delivery by comparing your order to the shipping documents for
correctness and completeness.
WARNING
Using a damaged or incomplete device
Risk of explosion in hazardous areas.
● Do not use damaged or incomplete devices.
1.4 Product package for base plate

①Base plate with overload protection
②Bolts with washers to fasten the load cell
③Spacing strip
Figure 1-1 Scope of delivery for base plate
Introduction
1.4 Product package for base plate
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1.5 Scope of delivery for elastomer bearing 350 to 500 kg

①Elastomer bearing
②Hexagon screw
1.6 Scope of delivery for elastomer bearing 10 to 200 kg

①Elastomer bearing
②Washer
③Hexagon bolt
Introduction
1.6 Scope of delivery for elastomer bearing 10 to 200 kg
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1.7 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
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.
1.8 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
1.8 Notes on warranty
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Description 2
2.1 Application
2.1.1 Base plate and elastomer bearing
The self-centering elastomer bearing for SIWAREX WL230 BB-S SA load cells is particularly
suitable for installation in roller table, platform and vessel weighing machines. The elastomer
bearing is firmly connected to the load cell and the load carrier. This provides a lift-off protection
to a limited extent.
The elastomer bearing is responsible for the direct transmission of force in the load cells.
The base plate fixes the load cell to the foundation.
The base plate and elastomer bearing have the following features:
● Easy installation of the load cell
● Self-centering effect on the load bearing implement
2.1.2 Use of the 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
2.2 Design
2.2.1 Design of base plate and elastomer bearing
The base plate and the elastomer bearing consist of the following components:
● Elastomer bearing
● Locking screw
● Base plate
Together with the load cell, the elastomer bearing represents a self-centering bearing unit.
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
①Elastomer bearing
②Hexagon screw, optionally with washer, see scope of delivery
③Overload protection with nut
④Base plate
⑤Spacing strip
⑥Load cell, not included in scope of delivery
⑦Screws with washers
Figure 2-1 Base plate and elastomer bearing
2.2.2 Design of the grounding cable
The grounding cable consists of a fine-gauge copper wire with a cross-section of 50 mm2 as
well as two Ø 10 mm lugs.
2.3 Functionality of elastomer bearing unit and grounding cable
Base plate and elastomer bearing
Elastomer bearings provide lateral guidance of the load cells and the base plate. Together with
the load cell, both form a self-centering unit.
Description
2.3 Functionality of elastomer bearing unit and grounding cable
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Grounding cable
The grounding cable represents an electrical bypass via the load cell and elastomer bearing
unit. High weld currents can destroy the load cell and the electronics. The electronics can be
affected by voltage sparkovers of static discharges.
Description
2.3 Functionality of elastomer bearing unit and grounding cable
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Description
2.3 Functionality of elastomer bearing unit and grounding cable
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Application planning 3
3.1 Load cell dummies
Principle of operation
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.
Dummies might be designed as follows:
● A copy of the compact mounting unit by means of a welded construction for coarse
installation work
● Use of a SIWAREX compact mounting unit for light installation work
A copy of the compact mounting unit by means of a welded construction for coarse installation
work
A piece of pipe or some other steel profile is welded between two plates with the hole pattern
for the fixing screws. The total height corresponds to the installation height of the compact
mounting unit. This is the most stable and secure version. Rough installation work can be
carried out with the welded construction.
Use of a SIWAREX compact mounting unit for light installation work
The compact installation units are delivered pre-assembled. Compact installation units are set
to the installation height of the operational unit. With compact mounting units, light installation
work can be carried out.
3.2 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 3-1 Proposed solution for lifting protection
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3.3 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.
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
With this method, the output signals of all of the load cells are attuned to each other under a
load. To ensure that all of the load cells receive approximately the same load, use
compensation plates to compensate the heights. The compensation plates are positioned
between the bracket and top plate of the compact mounting unit.
The output signals of the individual load cells correspond to the load distribution.
Compensate for the differences in height as described in the section Compensation of height
with four or more support points (Page 25).
Application planning
3.3 Load pick-up
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3.4 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.
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 3-2 Pendulum limitation with a maximum deflection of 4 mm as exemplified by two weighing
platforms
Application planning
3.4 Overload protection
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3.5 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.
Figure 3-3 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.
Application planning
3.5 Guide elements
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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.
Ensure that the guide elements to be used comply with the principles applicable to weighing
technology.
3.6 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
3.6 Grounding cable
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Application planning
3.6 Grounding cable
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Installation 4
4.1 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 13)
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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 disturbances cause errors in the measuring result and can damage load cells
and elastomer bearings 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 17).
– 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 Grounding cable
(Page 17).
Installation
4.1 Safety instructions
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