Siemens SIWAREX JB User manual

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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
12/2017
A5E4301185
1-AA
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
Appendix
A

Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E43011851
Ⓟ
01/2018 Subject to change
Copyright © Siemens AG 2017.
All rights reserved
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.

SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 3
Table of contents
1 Introduction............................................................................................................................................. 5
1.1 Purpose of this documentation .................................................................................................5
1.2 Document history ......................................................................................................................5
1.3 Product compatibility.................................................................................................................5
1.4 Checking the consignment .......................................................................................................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 ......................................................................................10
2.2 Requirements for special applications ....................................................................................10
2.3 Use in hazardous areas..........................................................................................................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
3.3 Nameplates.............................................................................................................................17
4 Application planning.............................................................................................................................. 19
4.1 Cable glands ...........................................................................................................................19
5 Installing/mounting ................................................................................................................................ 21
5.1 Basic safety instructions .........................................................................................................21
5.2 Mounting .................................................................................................................................21
6 Connecting ........................................................................................................................................... 23
6.1 Basic safety instructions .........................................................................................................23
6.2 Wiring diagrams ......................................................................................................................25
6.2.1 Load cells with four-wire system.............................................................................................25
6.2.2 Load cells with six-wire system...............................................................................................27
6.3 Connecting junction boxes......................................................................................................28
6.4 Connecting the cable ..............................................................................................................29

Table of contents
SIWAREX JB
4Operating Instructions, 12/2017, A5E43011851-AA
7 Service and maintenance...................................................................................................................... 31
7.1 Disposal ................................................................................................................................. 31
8 Technical data ...................................................................................................................................... 33
8.1 Rated conditions .................................................................................................................... 33
8.2 Construction ........................................................................................................................... 33
8.3 Electrical specifications.......................................................................................................... 35
8.4 Certificates and approvals ..................................................................................................... 36
9 Dimension drawings.............................................................................................................................. 37
9.1 Dimension drawing stainless steel enclosure ........................................................................ 37
9.2 Dimension drawing aluminum enclosure ............................................................................... 38
10 Ordering data........................................................................................................................................ 39
10.1 Accessories............................................................................................................................ 39
A Appendix .............................................................................................................................................. 41
A.1 Technical support................................................................................................................... 41
A.2 Certificates ............................................................................................................................. 41
Index .................................................................................................................................................... 43

SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 5
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.
Manual edition
Note
12/2017 Initial release
1.3
Product compatibility
The following table describes compatibility between manual edition, device revision, and the
engineering system.
Manual edition
Comment
Product compatibility
Compatibility with device integra-
tion package
12/2017 First edition 7MH5001-0AA20, 7MH5001-
0AA00, 7MH5001-0AA01
-

Introduction
1.4 Checking the consignment
SIWAREX JB
6Operating Instructions, 12/2017, A5E43011851-AA
1.4
Checking the consignment
1. Check the packaging and the delivered items for visible damage.
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.
1.5
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.

Introduction
1.6 Transportation and storage
SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 7
1.6
Transportation and storage
To guarantee sufficient 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 sufficient protection during transport. Siemens cannot assume
liability for any costs associated with transportation damages.
NOTICE
Insufficient protection during storage
The packaging only provides limited protection against moisture and infiltration.
•Provide additional packaging as necessary.
Special conditions for storage and transportation of the device are listed in Technical data
(Page 33).
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 reflects the technical status at the time of publishing. Siemens reserves the right
to make technical changes in the course of further development.

Introduction
1.7 Notes on warranty
SIWAREX JB
8Operating Instructions, 12/2017, A5E43011851-AA

SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 9
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 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.
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 (EC)

Safety information
2.2 Requirements for special applications
SIWAREX JB
10 Operating Instructions, 12/2017, A5E43011851-AA
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 potential-
ly explosive atmospheres
The applicable directives can be found in the EU conformity declaration of the specific
device.
See also
Certificates (Page 41)
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 b
efore 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 information
2.3 Use in hazardous areas
SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 11
2.3
Use in hazardous areas
Qualified personnel for hazardous area applications
Persons who install, connect, commission, operate, and service the device in a hazardous
area must have the following specific qualifications:
●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.
WARNING
Use in hazardous areas
Risk of explosion.
•Only use equipment that is approved for use in the intended hazardous area and
labelled accordingly.
WARNING
Loss of safety of device with type of protection "Intrinsic safety Ex i"
If the device has already been operated in non-intrinsically safe circuits or the electrical
specifications 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 specifications for the electrical data on the certificate and/or in Technical
data (Page 33).

Safety information
2.3 Use in hazardous areas
SIWAREX JB
12 Operating Instructions, 12/2017, A5E43011851-AA

SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 13
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
Load cell
JB
SIWAREX JB junction box
W
Electronic weighing system
Figure 3-1 Connection design for up to four load cells

Description
3.1 Applications
SIWAREX JB
14 Operating Instructions, 12/2017, A5E43011851-AA
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 first
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.
LC
Load cell
JB
SIWAREX JB junction box
W
Electronic weighing system
Figure 3-2 Application design with more than four load cells

Description
3.2 Design
SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 15
3.2
Design
3.2.1
Stainless steel enclosure
①
Cover
④
EMC cable gland for the signal cable
to the electronic weighing system or "Ex barrier"
②
Back 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
③
Screw for cover (4x)
⑨
Mounting flange for
equipotential-bonding conductor
Figure 3-3 Stainless steel enclosure

Description
3.2 Design
SIWAREX JB
16 Operating Instructions, 12/2017, A5E43011851-AA
3.2.2
Aluminum enclosure
①
Cover
④
EMC cable gland for the signal cable
to the electronic weighing system or "Ex
barrier"
②
Back with nameplate
⑤
⑦
⑥
⑧
Plastic cable gland for the
connecting cable a load cell
③
Screw for cover (4x)
⑨
Mounting screw for
equipotential-bonding conductor
Figure 3-4 Aluminum enclosure

Description
3.3 Nameplates
SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 17
3.3
Nameplates
The nameplate shows the article number and other important product information.
①
Manufacturer
⑥
Place of manufacture
②
Protection class
⑦
Serial number
③
Consult operating instructions
⑧
Article number
④
Development stage
⑨
Product name
⑤
Manufacturer's address
Figure 3-5 Example nameplate with general information
⑩
ATEX/IECEx marking for hazardous area
⑬
Approvals
⑪
Permitted ambient temperature for the hazardous area of
the corresponding temperature class
⑭
ATEX symbol
⑫
CE mark
Figure 3-6 Example nameplate with information on the hazardous area

Description
3.3 Nameplates
SIWAREX JB
18 Operating Instructions, 12/2017, A5E43011851-AA

SIWAREX JB
Operating Instructions, 12/2017, A5E43011851-AA 19
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)

Application planning
4.1 Cable glands
SIWAREX JB
20 Operating Instructions, 12/2017, A5E43011851-AA