Siemens SIWAREX JB User manual

Weighing systems
Junction boxes
SIWAREX JB
Operating Instructions
7MH5001-0AA20 (SIWAREX JB aluminum)
7MH5001-0AA00 (SIWAREX JB stainless steel)
7MH5001-0AA01 (SIWAREX JB stainless steel Ex)
7MH5001-0AA41 (SIWAREX JB polyester Ex)
09/2022
A5E43011851-AD
Introduction 1
Safety information 2
Description 3
Application planning 4
Installing/mounting 5
Connecting 6
Service and maintenance 7
Technical data 8
Dimension drawings 9
Ordering data 10
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: A5E43011851
Ⓟ 09/2022 Subject to change
Copyright © Siemens AG 2017 - 2022.
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................................................................................................... 5
1.4 Scope of delivery ................................................................................................................. 6
1.5 Security information ............................................................................................................ 6
1.6 Transportation and storage .................................................................................................. 7
1.7 Notes on warranty ............................................................................................................... 7
2 Safety information................................................................................................................................. 9
2.1 Prerequisites for safe use...................................................................................................... 9
2.1.1 Laws and directives.............................................................................................................. 9
2.1.2 Conformity with European directives.................................................................................... 9
2.2 Requirements for special applications................................................................................. 10
2.3 Use in hazardous areas....................................................................................................... 10
2.3.1 Special conditions.............................................................................................................. 11
3 Description........................................................................................................................................... 13
3.1 Applications....................................................................................................................... 13
3.2 Design............................................................................................................................... 15
3.2.1 Stainless steel enclosure..................................................................................................... 15
3.2.2 Aluminum enclosure.......................................................................................................... 16
3.2.3 Polyester enclosure ............................................................................................................ 17
3.2.4 Internal view...................................................................................................................... 17
3.3 Nameplates ....................................................................................................................... 18
4 Application planning ........................................................................................................................... 19
4.1 Cable glands...................................................................................................................... 19
5 Installing/mounting ............................................................................................................................. 21
5.1 Basic safety instructions ..................................................................................................... 21
5.2 Install the junction box....................................................................................................... 21
6 Connecting .......................................................................................................................................... 23
6.1 Basic safety instructions ..................................................................................................... 23
6.2 Connecting SIWAREX JB to the electronic weighing system and load cell ............................. 24
6.3 Wiring diagrams................................................................................................................. 25
6.3.1 Load cells with four-wire system......................................................................................... 25
6.3.2 Load cells with six-wire system........................................................................................... 27
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6.4 Connecting the cable ......................................................................................................... 28
7 Service and maintenance .................................................................................................................... 29
7.1 Disposal............................................................................................................................. 29
8 Technical data...................................................................................................................................... 31
8.1 Rated conditions................................................................................................................ 31
8.2 Construction...................................................................................................................... 31
8.3 Electrical speci󹪝cations ...................................................................................................... 33
8.4 Certi󹪝cates and approvals................................................................................................... 34
9 Dimension drawings............................................................................................................................ 35
9.1 Dimension drawing stainless steel enclosure ...................................................................... 35
9.2 Dimension drawing aluminum enclosure............................................................................ 36
9.3 Dimension drawing for polyester enclosure ........................................................................ 37
10 Ordering data ...................................................................................................................................... 39
10.1 Accessories........................................................................................................................ 39
A Product documentation and support .................................................................................................. 41
A.1 Product documentation ..................................................................................................... 41
A.2 Technical support............................................................................................................... 41
Index .................................................................................................................................................... 43
Table of contents
SIWAREX JB
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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.
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
09/2022 Safety instructions revised
Technical speci󹪝cations updated
08/2021 Polyester enclosure added
Technical speci󹪝cations updated
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.
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1.4 Scope of delivery

①Junction box with cover
②4 x M16 x 1.6 plastic/metal cable glands
③2 x M16 x 1.5 plastic/metal blanking plugs
④1 x M20 x 1.5 EMC cable gland
Figure 1-1 Scope of delivery: Stainless steel and aluminum enclosure

①Junction box with cover
②5 x M20 x 1.5 EMC cable gland
Figure 1-2 Scope of delivery: Polyester enclosure
1.5 Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
Introduction
1.5 Security information
SIWAREX JB
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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. 󹪝rewalls 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.
1.6 Transportation and storage
To guarantee su󹪟cient protection during transport and storage, observe the following:
• Keep the original packaging for subsequent transportation.
• Devices/replacement parts should be returned in their original packaging.
• If the original packaging is no longer available, ensure that all shipments are properly
packaged to provide su󹪟cient protection during transport. Siemens cannot assume liability
for any costs associated with transportation damages.
NOTICE
Insu󹪟cient protection during storage
The packaging only provides limited protection against moisture and in󹪝ltration.
• Provide additional packaging as necessary.
Special conditions for storage and transportation of the device are listed in Technical data
(Page 31).
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.
Introduction
1.7 Notes on warranty
SIWAREX JB
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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
SIWAREX JB
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Safety information 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
Consult operating instructions
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 Conformity with European directives
The CE mark on the device is a sign of conformity with the following European directives:
Electromagnetic
compatibility EMC
2014/30/EU
Directive of the European Parliament and of the Council on the
harmonization of the laws of the Member States relating to elec‐
tromagnetic compatibility
Atmosphère explosible ATEX
2014/34/EU
Directive of the European Parliament and of the Council on the
harmonization of the laws of the Member States relating to
equipment and protective systems intended for use in potentially
explosive atmospheres
2011/65/EU RoHS Directive of the European Parliament and of the Council on the
restriction of the use of certain hazardous substances in electrical
and electronic equipment
The applicable directives can be found in the EU conformity declaration of the speci󹪝c device.
SIWAREX JB
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See also
Certi󹪝cates and approvals (Page 34)
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.
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.
2.3 Use in hazardous areas
Quali󹪝ed personnel for hazardous area applications
Persons who install, connect, commission, operate, and service the device in a hazardous area
must have the following speci󹪝c quali󹪝cations:
• They are authorized, trained or instructed in operating and maintaining devices and systems
according to the safety regulations for electrical circuits, high pressures, aggressive, and
hazardous media.
• They are authorized, trained, or instructed in carrying out work on electrical circuits for
hazardous systems.
• They are trained or instructed in maintenance and use of appropriate safety equipment
according to the pertinent safety regulations.
Safety information
2.3 Use in hazardous areas
SIWAREX JB
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WARNING
Use in hazardous area
Risk of explosion.
• Only use equipment that is approved for use in the intended hazardous area and labeled
accordingly.
• Do not use devices that have been operated outside the conditions speci󹪝ed for hazardous
areas. If you have used the device outside the conditions for hazardous areas, make all Ex
markings unrecognizable on the nameplate.
WARNING
Loss of safety of device with type of protection "Intrinsic safety Ex i"
If the device or its components have already been operated in non-intrinsically safe circuits or
the electrical speci󹪝cations have not been observed, the safety of the device is no longer
ensured for use in hazardous areas. There is a risk of explosion.
• Connect the device with type of protection "Intrinsic safety" solely to an intrinsically safe
circuit.
• Observe the speci󹪝cations for the electrical data on the certi󹪝cate and/or in Technical data
(Page 31).
2.3.1 Special conditions
1. The permissible ambient temperature range is -40°°C to +80°°C. For ambient temperatures
≥60°°C, use corresponding temperature resistant cables.
2. The circuits that are connected must be only intrinsically safe or only non-intrinsically safe.
Mixing is not allowed. If the Ex terminal box type SIWAREX JB has been operated on non-
intrinsically safe circuits, the subsequent use as intrinsically safe equipment in the hazardous
area is not permitted.
3. Cable glands that are not required must be closed o󹪜 with appropriate screw plugs.
4. If the Ex terminal box type SIWAREX JB is operated non-intrinsically safe or intrinsically safe
with circuits grounded on both sides, the inner and outer connection for the equipotential
bonding conductor must be connected to the local equipotential bonding.
5. Further information and safety instructions in the operating instructions must be observed
accordingly.
Safety information
2.3 Use in hazardous areas
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Safety information
2.3 Use in hazardous areas
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Description 3
3.1 Applications
The SIWAREX JB junction box is used in weighing systems with extra-low voltages ≤ 30 V. The
SIWAREX JB junction box is used to connect load cells to the electronic weighing system.
You can connect up to four load cells in parallel in a junction box.
LC
LCLC
LC
LC
JB W
6
4/6
LC
LCLC
LC
LC
JB W
6
4/6
LC Load cell
JB SIWAREX JB junction box
W Electronic weighing system
Figure 3-1 Connection design for up to four load cells
If you have more than four load cells, connect an additional SIWAREX JB junction box in parallel
using a cross-connection. The extension set is required for this, see Accessories (Page 39). The
cross-connection allows you to connect up to three load cells in the 󹪝rst junction box. Up to four
load cells can be connected in the second junction box.
Load cells with 4-wire and 6-wire strain gauges can be connected.
The cable connection from the junction box to the electronic weighing system and between two
junction boxes is implemented with a six-wire system.
SIWAREX JB
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LC
LCLC
LC
JB W
6
4/6
LC
LCLC
LC
JB W
6
4/6
LC
LCLC
LC
LC
JB
LC
LCLC
LC
LC
JB
6
LC Load cell
JB SIWAREX JB junction box
W Electronic weighing system
Figure 3-2 Application design with more than four load cells
Description
3.1 Applications
SIWAREX JB
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3.2 Design
3.2.1 Stainless steel enclosure

①Cover ④EMC cable gland for the signal cable
to the electronic weighing system or "Ex barrier"
②Back of nameplate
Optional: Nameplate with information
on the hazardous area
⑤
⑦
⑥
⑧
EMC cable gland for the
connecting cable of a load cell
③Screw for cover (4x) ⑨Mounting 󹪞ange for
equipotential-bonding conductor
Figure 3-3 Stainless steel enclosure
Description
3.2 Design
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3.2.2 Aluminum enclosure

①Cover ④EMC cable gland for the signal cable
to the electronic weighing system or "Ex
barrier"
②Back with nameplate ⑤
⑦
⑥
⑧
Plastic cable gland for the
connecting cable a load cell
③Screw for cover (4x) ⑨Mounting screw for
equipotential-bonding conductor
Figure 3-4 Aluminum enclosure
Description
3.2 Design
SIWAREX JB
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3.2.3 Polyester enclosure

①Cover
②Screw for cover (4x)
③Nameplate
④Cable glands
Figure 3-5 Polyester enclosure
3.2.4 Internal view

①Disconnect wire jumper [BRIDGE 1 and BRIDGE 2] for the connection of Load cells with six-
wire system (Page 27)
②Output terminal [OUTPUT] for signal cable for weighing electronics
③Load cell terminals [LOAD CELL 1 ... LOAD CELL 4]
Figure 3-6 Internal view SIWAREX JB
Description
3.2 Design
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See also
Connecting (Page 23)
3.3 Nameplates
The nameplate shows the article number and other important product information.

①Manufacturer ⑥Place of manufacture
②Protection class ⑦Serial number
③Consult operating instructions ⑧Article number
④Development stage ⑨Product name
⑤Manufacturer's address
Figure 3-7 Example nameplate with general information
10
11
12
14

⑩ATEX/IECEx marking for hazardous area ⑬Approvals
⑪CE mark ⑭ATEX symbol
⑫Permissible ambient temperature for the hazardous area of
the corresponding temperature class
Figure 3-8 Example nameplate with information on the hazardous area
Description
3.3 Nameplates
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Application planning 4
4.1 Cable glands
The signal cable to the electronic weighing system is fed into the enclosure through an EMC
cable gland. A high level of protection against electromagnetic interference (EMI) is achieved
due to the large area shielding in the cable gland. The cable glands are made of nickel-plated
brass.
The aluminum SIWAREX JB junction box is equipped with plastic cable glands as standard. The
connecting cables of the load cells are fed into the enclosure through plastic cable glands. The
shielding is attached to screw terminals. If electromagnetic interference from the load cell cables
is expected in the system, the plastic cable glands can be replaced with EMC cable glands. EMC
cable glands are available as accessories (Page 39). Maximum immunity to interference is
achieved by the large area shielding layer.
The stainless steel SIWAREX JB junction box is equipped with EMC cable glands as standard. The
connecting cables of the load cells are fed into the enclosure through EMC cable glands. A high
level of protection against electromagnetic interference (EMI) is achieved due to the large area
shielding in the cable gland. The cable glands are made of nickel-plated brass.
Purchase EMC cable glands in stainless steel from the appropriate suppliers. Note that the cable
glands must be approved for the respective applications. See Service and support (http://
www.siemens.com/automation/service&support)
See also
Ordering data (Page 39)
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Application planning
4.1 Cable glands
SIWAREX JB
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