Siemens SIWAREX WL230 BB-S SA Technical Document

SIWAREX WL230
Compact mounting units and
guide elements
SB-S SA
Equipment Manual
7MH5707-4AA01 (compact mounting unit 0.5 to 1 t)
7MH5707-4GA01 (compact mounting unit 2 t)
7MH5707-4PA01 (compact mounting unit 5 t)
7MH5707-4GE00 (guide element 0.5 to 2 t)
7MH5707-4PE00 (guide element 5 t)
12/2020
A5E02390707B-03
Introduction 1
Safety notes 2
Description 3
Application planning 4
Installation 5
Service and maintenance 6
Technical data 7
Dimension drawings 8
Ordering data 9
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.
Quali󹪝ed Personnel
The product/system described in this documentation may be operated only by personnel quali󹪝ed for the speci󹪝c
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Quali󹪝ed 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 identi󹪝ed 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: A5E02390707B
Ⓟ 01/2021 Subject to change
Copyright © Siemens AG 2011 - 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 Scope of delivery for compact mounting unit ....................................................................... 6
1.5 Scope of delivery guide element .......................................................................................... 7
1.6 Security information ............................................................................................................ 7
1.7 Notes on warranty ............................................................................................................... 8
2 Safety notes ........................................................................................................................................... 9
2.1 Prerequisites for safe use...................................................................................................... 9
2.1.1 Laws and directives.............................................................................................................. 9
2.1.2 Improper device modi󹪝cations.............................................................................................. 9
2.2 Requirements for special applications................................................................................. 10
3 Description........................................................................................................................................... 11
3.1 Area of application............................................................................................................. 11
3.1.1 Compact mounting unit..................................................................................................... 11
3.1.2 Guide elements ................................................................................................................. 11
3.1.3 Lifting protection ............................................................................................................... 12
3.1.4 Overload protection ........................................................................................................... 12
3.1.5 Grounding cable ................................................................................................................ 12
3.2 Design............................................................................................................................... 13
3.2.1 Compact mounting unit..................................................................................................... 13
3.2.2 Guide element................................................................................................................... 14
3.2.3 Nameplate......................................................................................................................... 15
3.3 Principle of operation......................................................................................................... 15
3.3.1 Compact mounting unit..................................................................................................... 15
3.3.2 Guide element................................................................................................................... 17
4 Application planning ........................................................................................................................... 19
4.1 Load cell dummies............................................................................................................. 19
4.2 Lifting protection ............................................................................................................... 19
4.3 Load pick-up ...................................................................................................................... 20
4.4 Overload protection ........................................................................................................... 21
4.5 Guide elements ................................................................................................................. 22
5 Installation........................................................................................................................................... 25
5.1 Safety information/instructions .......................................................................................... 25
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5.2 Installing the compact installation unit............................................................................... 27
5.2.1 General installation information......................................................................................... 27
5.2.2 Overview........................................................................................................................... 27
5.2.3 Preparing the load cell ....................................................................................................... 28
5.2.4 Preparing the compact installation unit .............................................................................. 28
5.2.5 Installing the load cell in the compact installation unit........................................................ 28
5.2.6 Installing the compact installation unit............................................................................... 30
5.2.7 Lowering the load bearing implement onto the load cells ................................................... 32
5.2.8 Compensation of height with four or more support points.................................................. 32
5.2.9 Checking the installation.................................................................................................... 33
5.3 Install guide element ......................................................................................................... 34
5.3.1 General installation information......................................................................................... 34
5.3.2 Preparing the guide element.............................................................................................. 35
5.3.3 Locking the top plate ......................................................................................................... 35
5.3.4 Fixing of guide element ..................................................................................................... 35
5.3.5 Lowering the load bearing implement onto the load cells ................................................... 35
5.3.6 Fixing of second guide element.......................................................................................... 36
5.3.7 Checking the installation.................................................................................................... 36
5.4 Dismantling ....................................................................................................................... 36
6 Service and maintenance .................................................................................................................... 37
6.1 Servicing and maintenance................................................................................................ 37
6.2 Disposal............................................................................................................................. 38
7 Technical data...................................................................................................................................... 39
7.1 Compact mounting unit..................................................................................................... 39
7.2 Guide elements ................................................................................................................. 39
8 Dimension drawings............................................................................................................................ 41
8.1 Compact mounting units.................................................................................................... 41
8.2 Guide elements ................................................................................................................. 44
9 Ordering data ...................................................................................................................................... 45
9.1 Accessories........................................................................................................................ 45
A Product documentation and support .................................................................................................. 47
A.1 Product documentation ..................................................................................................... 47
A.2 Technical support............................................................................................................... 47
Index .................................................................................................................................................... 49
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, 󹪝rst review its principle of operation.
The instructions are aimed at persons mechanically installing the device, connecting it
electronically, con󹪝guring 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
12/2020 Ground strap integrated and guide elements added
12/2011 Fixing screws and tightening torques
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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 clari󹪝cation.
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 Scope of delivery for compact mounting unit

①Top plate
②Bolts with washers to fasten the load cell
③Base plate
④Grounding cable
⑤Upper and lower hexagon nuts
⑥Pendulum bolt enclosure
⑦Pendulum bolt
Figure 1-1 Scope of delivery for compact mounting unit, preassembled
Introduction
1.4 Scope of delivery for compact mounting unit
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Note
Spacing strip
Mount a spacing strip with a compact mounting unit with a rated load of 0.5 t and 1 t.
1.5 Scope of delivery guide element

①1 Turnbuckle, set to length
②1 Upper 󹪞ange
③1 Bottom 󹪞ange
④2 Hexagon-head bolts
⑤2 Hexagonal nuts
⑥4 Cylinder head screws
⑦4 Washers
Figure 1-2 Scope of delivery guide element
1.6 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 form one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. These systems, machines and components should only be connected
to the enterprise network or the Internet if and only to the extent necessary and with appropriate
security measures (󹪝rewalls and/or network segmentation) in place.
You can 󹪝nd more information on protective measures in the area of industrial security by
visiting:
https://www.siemens.com/industrialsecurity.
Introduction
1.6 Security information
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Siemens’ products and solutions undergo continuous development to make them more secure.
Siemens strongly recommends performing product updates as soon as they are available and
using only the latest product versions. Use of product versions that are no longer supported, and
failure to apply 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.
1.7 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 re󹪞ects the technical status at the time of publishing. Siemens reserves the right to
make technical changes in the course of further development.
Introduction
1.7 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 speci󹪝cations 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.
Symbol Explanation
Do not turn countersunk screw
2.1.1 Laws and directives
Observe the safety rules, provisions and laws applicable in your country during connection,
assembly and operation. These include, for example:
• National Electrical Code (NEC - NFPA 70) (USA)
• Canadian Electrical Code (CEC) (Canada)
Further provisions for hazardous area applications are for example:
• IEC 60079-14 (international)
• EN 60079-14 (EU)
2.1.2 Improper device modi󹪝cations
WARNING
Improper device modi󹪝cations
Risk to personnel, system and environment can result from modi󹪝cations to the device,
particularly in hazardous areas.
• Only carry out modi󹪝cations that are described in the instructions for the device. Failure to
observe this requirement cancels the manufacturer's warranty and the product approvals.
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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 o󹪟ce 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.
Safety notes
2.2 Requirements for special applications
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Description 3
3.1 Area of application
3.1.1 Compact mounting unit
Compact mounting units take on the direct introduction of force into the load cells.
The compact mounting units have the following characteristics:
• Easy installation of the load cell
• Easy adjustment of the load cell under the load bearing implement
• Self-centering on the load bearing implement
• Can be used as a dummy for light installation work
• Ensure slow and controlled lowering of the load bearing implement
• Can be used as a transport lock by 󹪝xing the top plate
• Integrated lifting protection
• Designed relief of the load cell during installation
• Overload protection of the load cell during installation
• The load cell can be inserted before or after installation of the compact mounting unit
• Prepared for the attachment of guide elements: single-sided or double-sided
• Highly 󹪞exible ground wire for protection of load cell against parasitic currents
• Parts made of stainless steel for applications in the food and pharmaceutical industries
Compact mounting unit for SIWAREX WL230 SB‑S SA
The self-centering compact mounting unit for SIWAREX WL230 SB‑S SA load cells is particularly
suitable for implementation in container, platform and roller table scales.
3.1.2 Guide elements
Guide elements route horizontal forces acting on load bearing implements directly into the
foundation. Transverse forces onto the load cells do not occur as a result. The result of the load
cells is not falsi󹪝ed by this in󹪞uence.
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Guide elements are used in the following cases:
• Horizontal forces occur during the weighing procedure. This is the case with all dynamic
weighing procedures or if containers are weighed outdoors where wind can have an e󹪜ect.
• Movement of the load bearing implement as a result of horizontal forces is prevented. This
is the case with braking or acceleration forces of belt or roller table scales or with mixing
tanks in which unbalance can occur as a result of an agitator.
The SIWAREX guide elements are used together with the compact mounting units. The guide
elements have the following characteristics:
• Subsequent attachment to the compact installation unit
• You can install a guide element either on the front or rear of the compact mounting unit.
• The double-sided attachment of two guide elements doubles the possible transverse force.
• Parts made of stainless steel for applications in the food and pharmaceutical industries
Do not tension weighing equipment using guide elements. The guide elements must not
prevent changes in the dimensions of the load bearing implement resulting from changes in
temperature, for example. This can principally be achieved by always using three guide
elements.
3.1.3 Lifting protection
The lifting protection prevents the load bearing implement from being lifted o󹪜 of the load cells.
If there is a risk of the load bearing implement being lifted or toppled, then lifting protection is
required. Lifting protection is required in the case of lightweight containers and tall, outdoor
silos.
3.1.4 Overload protection
The overload protection protects load cells from a load that is too great.
There is overload protection against excessive loads in the measuring direction and overload
protection against excessive transverse forces.
Transverse forces are caused by, for example, wind, 󹪝lling processes, acceleration, or conveyor
belt friction. Protect the load cell from loads as stated in section Technical data (Page 39).
3.1.5 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
Description
3.1 Area of application
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• Welding work
• Static charge
The grounding cables in the compact installation units are made up of 󹪝ne-core 󹪞exible copper
wires. The 󹪞exible copper wires are tin-coated to additionally protect the copper from corrosion.
3.2 Design
3.2.1 Compact mounting unit
The compact installation unit comprises the following main components:
• Base plate ⑪
• Top plate ③
• Pendulum bolt ⑤
• Two countersunk head screws ② as aids to installation and adjustment
Together with the load cell, the compact installation unit represents a self-centering bearing
unit.
Description
3.2 Design
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
①Countersunk head screws ⑧Lower hexagon nut
②Top plate ⑨Upper hexagon nut
③Bolts ⑩Washers
④Washers ⑪Pendulum bolt enclosure
⑤Load cell, not included in the scope of de‐
livery
⑫Pendulum bolt
⑥Base plate ⑬Two bolt connections to the bracket plate
⑦Grounding cable
Figure 3-1 Exploded view: compact installation unit with built-in load cell
3.2.2 Guide element
The guide element comprises the following main components:
1. Turnbuckle with two pivot heads ①
2. 2 x 󹪞anges ②③
The 󹪞anges are screwed onto the sides of the top and base plates of the compact mounting unit.
You can install one or two guide elements to a compact mounting unit. The turnbuckle can be
moved freely in the pivot heads.
Description
3.2 Design
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Refer to the scope of delivery (Page 7) for the components.
3.2.3 Nameplate
6,:$5(;:/&203$&702817,1*81,70+$$6%66$W
①Product name
②Article number
③Rated load
④Manufacturer's address
⑤Place of manufacture
Figure 3-2 Example of nameplate
3.3 Principle of operation
3.3.1 Compact mounting unit
The top plate is aligned and 󹪝xed above the base plate with the two countersunk screws. This
results in a stable unit. The height of the top plate is 3 millimeters higher upon delivery than the
installation height with a load cell.
In this state the compact mounting unit serves as an installation aid. Use the compact mounting
unit as dummy for light installation jobs.
Description
3.3 Principle of operation
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Figure 3-3 Pre-assembled compact mounting unit
Prior to installation, the load cell is inserted with the pendulum bolt enclosure and the pendulum
bolt into the compact mounting unit. The load cell is secured with 2 hexagon bolts in its position.
Then the complete unit is installed in the scales. Compensate angular and/or 󹪞atness errors as
well as di󹪜erences in height between the brackets using compensation plates. Make sure that
the connection plates are not tensioned and that the base/top plates are not concave in the
center. The compact mounting units are optimally aligned when screwed tight. The load cells are
not yet loaded.
PP
Figure 3-4 Installation state
Finally, the load bearing implement is lowered by loosening the two upper hexagon nuts under
the top plate. The top plate with pressure piece is lowered onto the load cell. The weight now
rests on the load cells.
Description
3.3 Principle of operation
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Figure 3-5 Operating state
In this state the load cell and the pressure pieces together form a self-centering unit. The
compact mounting unit permits sideways displacement of the top plate, and hence of the load
bearing implement, by up to 3 millimeters. The countersunk head screws provide lifting
protection and, to a limited extent, pendulum limitation.
3.3.2 Guide element
A guide element prevents that the top plate moves in exactly one direction. All other directions
are free.
When arranged appropriately, three guide elements prevent the load bearing implement from
moving horizontally. The movement in the measuring direction is not restricted. Expansion of
the load bearing implement as a result of changes in temperature or load is not prevented.
Transverse forces acting on the load bearing implement are routed directly into the foundation.
With more than three guide elements, the risk exists that the guide elements tension each other.
This implies measuring errors.
Figure 3-6 Compact installation unit with load cell and guide element
Description
3.3 Principle of operation
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Description
3.3 Principle of operation
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Application planning 4
4.1 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 pro󹪝le is welded between two plates with the hole pattern
for the 󹪝xing 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.
4.2 Lifting protection
Lifting protection is integrated in the compact installation units for the load cells of the
SIWAREX series. When other compact mounting units are used, lifting protection must be
provided for in the design.
The following 󹪝gure 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
;
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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 󹪝rm 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 󹪝rm 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 di󹪜erences in height as described in the section Compensation of height
with four or more support points (Page 32).
Application planning
4.3 Load pick-up
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