Siemens SIWAREX JB User manual

SIWAREX JB

Aluminum Housing

Instruction Manual Edition 03/2006

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 2

Table of Contents

Table of Contents............................................................................................. 2

Warning and Safety Terms.............................................................................. 3

General.............................................................................................................. 4

1Technical Description.............................................................................. 5

1.1 Area of Application..................................................................................... 5

1.2 Structure .................................................................................................... 5

1.3 System Configuration................................................................................. 6

2Installation/Assembly.............................................................................. 7

2.1 Installation.................................................................................................. 7

2.2 Connection................................................................................................. 7

2.3 Installation................................................................................................ 11

2.4 Spring Terminal Connection Technique................................................... 13

3Commissioning...................................................................................... 14

4Technical Data........................................................................................ 15

4.1 Functional Data........................................................................................ 15

4.2 Device Version......................................................................................... 15

4.3 Explosion Protection ................................................................................ 15

4.4 Electromagnetic Compatibility.................................................................. 16

4.5 Dimensions .............................................................................................. 16

5. Care and Maintenance........................................................................... 17

6. Ordering Data......................................................................................... 18

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 3

Warning and Safety Terms

DANGER

Means, that death, severe injury to persons or damage to equipment will be

caused if the respective safety measures have not been taken.

WARNING

Means, that death or severe injury can be caused if the respective safety

measures are not taken.

CAUTION

With a warning triangle means that failure to take the necessary precautions may

lead to minor injury.

CAUTION

Without a warning triangle means that failure to take the necessary precautions

may lead to property damage.

IMPORTANT

Means that failure to observe the appropriate instructions may lead to an

undesirable result or condition.

NOTE

Means a note of a possible benefit if recommendations are followed.

Qualified personnel as referred to in the safety instructions in this manual and on

the product itself are individuals who are familiar with the installation, assembly,

initial start-up and operation of this product. They must be authorized and qualified

to install, start and maintain devices, systems and circuits in accordance with

national safety rules and regulations.

Circulation or duplication of this document, utilization and

disclosure of its contents are not permitted unless explicitly

including rights created by granting of patents or registration of a

utility model or design.

Siemens AG

Automation and Drives

Process Instrumentation and Analytics

D-76181 Karlsruhe

Disclaimer

We have tested the contents of this document for compatibility with

the hardware and software described. This does not exclude the

possibility of discrepancies, in which case we do not guarantee the

complete compatibility of this document. The information in this

document is assessed regularly and any necessary corrections are

included in the next revision. We are grateful for any suggestions

for improvement.

Subject to technical changes

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 4

General

Intended Utilization

Intended utilization means that this product is only to be utilized within the

limitations defined in the technical specifications and purposes of use in this

operating manual.

There are no dangers associated with this device when conforming with the safety

notes and the intended utilization.

The fail-safe and secure operation of this device depends on proper transportation,

storage, installation and assembly as well as on careful operation and

commissioning.

Proper operation of this device can only be ensured if the specifications provided in

the technical data are observed.

Improper handling can cause death, bodily harm and damage to equipment.

Notes on Product Liability

We expressly point out that the nature of the product is described exclusively and

conclusively in the sales contract. The content of this product documentation is not

part of an earlier or existing agreement, promise or legal relationship and neither

shall it change any of these. All Siemens obligations ensue from the respective

contract of sale which also contains the full and exclusively valid liability regulation.

The provisions about product liability specified in the contract of purchase are not

extended or limited by the information provided in this document.

Delivery Notes

The respective scope of delivery is listed on the enclosed shipping documents

according to the valid contract of sale.

Please observe the instructions printed on the packaging when opening. Check

that the delivered goods are complete and undamaged. In particular, compare the

order number on the type plate with the order data.

Please read this manual before starting work! It contains important instructions

and data which guarantee the general safety and functionality of this device when

observed. This considerably simplifies handling of this product and leads to reliable

measuring results.

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 5

LCLC

JB W

4/6

LCLC

JB W

4/6

LCLC

4/6

LCLC

4/6

1 Technical Description

1.1 Area of Application

The SIWAREX JB junction box made of die-cast aluminum serves for connecting

load cells with the weigh module. Up to four load cells can be connected in parallel

in one junction box (fig. 1-1). Another junction box must be connected in parallel by

a cross connection in case of more than 4 load cells (fig. 1-2).

Load cells with wire strain gages in 4 and

6-wire technology can be connected in

parallel.

The cable connection from the junction box

to the weigh module and between two

junction boxes must be made in 6-wire

technique.

The SIWAREX JB junction box may only

be used with low voltages of ≤30 V.

1.2 Structure

The housing is made of a heavy duty, powder-coated die-cast aluminum AlSi12.

It consists of bottom part and lid. It is dustproof and splash proof according to the

IP 66 degree of protection. The cables are fed into the housing through screw

cable glands. High electromagnetic compatibility (EMC) is only achieved by the

large area of the shield in the screw cable gland. The screw cable glands are made

of nickel-plated brass.

The electrical conductors are wired by spring terminals. The spring terminal

technology guarantees vibration-free, maintenance-free connections. The contact

reliability is permanently guaranteed.

A potential equalization line can be connected via a PAL terminal.

Fig. 1-1 Connection principle of

4 load cells

LC = Load Cell

JB = Junction Box

W = Weigh module

LC = Load Cell

JB = Junction Box

W = Weigh module

Fig. 1-2 Connection principle of

8 load cells

Revision 03.06 Technical Description

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 6

1.3 System Configuration

The SIWAREX JB junction box is used in technical weighing systems for parallel

connection of up to four wire strain gage load cells. If more than four load cells

are to be connected to a weigh module, several junction boxes can be connected

to each other by cross connections. Load cells can be connected in 4 and 6-wire

technology.

The technical data of the weigh module and load cells used must be observed

with the maximum number of load cells. The total resistance of the parallel

switched load cells must be in the range of the permissible load resistance of

the weigh module.

The junction box is connected with the weigh module with a signal cable.

A shielded cable with six wires must be used as the signal connection.

We recommend the SIWAREX cable Li2Y2x0,75St+2x(2x0,34St)-CY:

•7MH4 702-8AG, orange coated, for standard applications or

•7MH4 702-8AF, blue coating, for Ex-applications.

The maximum cable length between load cells and weigh module can be found

in the technical data of the weigh module. Intermediate elements such as

Ex disconnectors must be taken into account.

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 7

2 Installation/Assembly

2.1 Installation

The SIWAREX JB junction box may only be installed and connected by qualified

personnel.

2.2 Connection

The connection of load cells with 4 or 6-wire technique to a weigh module must be

made according to the wiring diagrams in fig. 2-1 or fig. 2-2, page 8. Analogously,

several load cells are also connected in parallel.

The pinout of the terminals is shown in fig. 2-3, page 9. Four terminals are

connected in signal blocks with a plug-in bridge.

The cable shields in the EMC screw cable glands should cover a large area

(fig. 2-4, page 9). EMC cable glands and sealing plugs are delivered with the

junction box. They should be mounted according to the number of load cells.

Unused openings in the housing should be sealed with sealing plugs.

The pinout of the screw cable glands is shown in fig. 2-5, page 10.

When connecting load cells using 4 wires, two bridges are absolutely necessary:

Bridge 1: EXC- to SENSE-

Bridge 2: EXC+ to SENSE+

IMPORTANT

If the two bridges EXC-/SENSE- and EXC+/SENSE+ are missing in load cells in

4-wire technology, this can be signaled by the weigh module as a wire break.

Revision 03.06 Installation/Assembly

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 8

Fig. 2-1 Load cell connection by 4-wire technique

Fig. 2-2 Load cell connection by 6-wire technique

Revision 03.06 Installation/Assembly

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 9

Fig. 2-4 Shield in the screw cable gland

Fig. 2-3 Terminal block

Revision 03.06 Installation/Assembly

SIWAREX JB junction box in aluminum housing – Instruction Manual

A5E00400544B 10

Fig. 2-5 Pinout of the screw cable glands

LC = Load cell Input

W = Output to weigh module, to the Ex barrier or other junction box

EPB = Equipotential bonding connection

LC LC LC LC

W W

EPD

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