Siemens SIWAREX R Construction Elastomer Bearing Bedienungsanleitung

SIWAREX R

Mounting units for BB series

Instruction Manual Revision 11/2012

Document-No.: A5E00295975A Page 2

SIWAREX R

Mounting elements for load cells in the BB series

Instruction Manual

Chapter Overview

Warning and Safety Terms ............................................................................... 4

General 5

1. General Conditions for Installation and Assembly ........................... 7

1.1 Lift lock ................................................................................................ 7

1.2 Overload Protection ............................................................................. 7

1.3 Guide Elements.................................................................................... 8

1.4 Load Cell Dummies ............................................................................ 10

1.5 Load Cell Handling ............................................................................. 10

1.6 Welding and Installation Work............................................................ 11

1.7 Mounting ........................................................................................... 11

1.8 Installation Surfaces........................................................................... 12

1.10 Dismantling........................................................................................ 13

1.11 Explosion Protection .......................................................................... 13

2Elastomer Bearing ............................................................................ 14

2.1 Technical Description ......................................................................... 14

2.1.1 Application Range........................................................................................ 14

2.1.2 Construction ................................................................................................. 14

2.1.2.1 Elastomer Bearing Construction BB 10 - 200 kg...................................... 14

2.1.2.2 Construction Elastomer Bearing BB 350 / 500 kg.................................... 15

2.2 Assembly............................................................................................ 16

2.2.1 Assembly Elastomer Bearing BB 10 - 200 kg....................................... 16

2.2.2 Assembly Elastomer Bearing BB 350 / 500 kg..................................... 19

2.3 Technical Data.................................................................................... 21

2.3.1 Function Data ............................................................................................... 21

2.3.2 Dimensions ................................................................................................... 22

Document-No.: A5E00295975A Page 3

2.4 Care and Maintenance ....................................................................... 24

2.5 Ordering Data............................................................................................... 25

3Combi-Mounting Unit ...................................................................... 26

3.1 Technical Description ......................................................................... 26

3.1.1 Application Range........................................................................................ 26

3.1.2 Construction ................................................................................................. 26

3.1.2.1 Construction Combi-Mounting Unit BB 10 - 200 kg................................ 26

3.1.2.2 Combi-Mounting Unit BB 350 / 500 kg..................................................... 27

3.2 Assembly............................................................................................ 28

3.2.1 Assembly Combi-Mounting Unit BB10 - 200 kg.................................. 28

3.2.2 Combi-Mounting Unit BB 350 / 500 kg............................................... 32

3.3 Technical Data.................................................................................... 35

3.3.1 Function Data ............................................................................................... 35

3.3.2 Dimensions ................................................................................................... 36

3.4 Care and Maintenance ....................................................................... 38

3.5 Ordering Data .................................................................................... 38

4Ground cable .................................................................................... 39

4.1 Technical Description ......................................................................... 39

4.1.1. Application Range........................................................................................ 39

4.1.2 Construction ................................................................................................. 39

4.2 Assembly............................................................................................ 39

4.3 Dimensions ........................................................................................ 40

4.4 Care and Maintenance ....................................................................... 40

4.5 Ordering Data .................................................................................... 40

Document-No.: A5E00295975A Page 4

Warning and Safety Terms

DANGER

means, that death, severe injury to persons or damage to equipment can 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 notice concerning possible advantages of conforming with the

recommendation.

Circulation or duplication of this document, utilization and

disclosure of its contents are not permitted as long as not explicitly

approved. Offenders will be liable for damages. All rights, including

rights created by patent grant or registration of a utility model or

design, are reserved.

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 described hardware and software. 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 following revision. We are grateful for any

suggestions of improvement.

Subject to technical changes.

Document-No.: A5E00295975A Page 5

General

Please read this manual before starting work! It contains important notes and data

for ensuring the general safety and functionality of this device. This information will

simplify the utilization of this product and will lead to more precise and secure

measurement results.

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

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 contents of this product documentation are

not part of an earlier or existing agreement, acceptance or legal relationship nor do

they affect these in any way. All obligations of Siemens result from the sales

contract, which also contains the full and solely valid liability agreement. The

provisions concerning product liability specified in the sales contract 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.

Qualified Personnel

Qualified personnel, in regards to the safety-related information in this manual and

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

commissioning and operation of this product. They must be authorized and

qualified to install, put into operation and maintain devices, systems and circuits in

accordance with national safety rules and regulations.

Document-No.: A5E00295975A Page 6

Brand names / Trademarks

SIWAREX ® is a registered trademark of Siemens AG.

The other designations in this manual may be trade marks, which if used by third

parties, may infringe upon the rights of the proprietor.

Document-No.: A5E00295975A Page 7

1. General Conditions for Installation and Assembly

1.1 Lift lock

Lift locks prevent the head plate being lifted from the load cells or permanently

mounted load cells from being overloaded by force against the measuring direction.

Lift locks are necessary if there is a danger of the load platform being lifted or

tipped. This is possible with light high containers or with silos that are not affixed

for example.

Lift locks are integrated in the combi-

mounting units of the BB series. When

using the mounting units, the lift locks

should be planned constructively. A

suggestion for an effective solution is

shown in Fig. 1-1. The measurement X

indicates the possible lift-path of the

load platform. The drill hole ØD must

be larger than the bolt diameter Ød.

The movement of the load platform

may not be hindered.

1.2 Overload Protection

Overload protection means protecting load cells from loads in the direction of

measurement that are too great. Forces that exceed the load limits for the load cells

can also come from the side.

Overload protection in the direction of measurement

Load cells are normally protected against vertical overloading by placing a stop-bolt

under the transmission of force. The path of measurement for the load cell is

limited in this manner. On load cells with high nominal loads, the danger of

accidental overloading is not so great. Any possible excessive loading can be taken

into account while dimensioning the load cells.

Another way of protecting load cells from overloading is in over-dimensioning the

load cells.

Overload protection from the side

Cross-forces exist because of wind, filling procedures, acceleration or conveyor belt

friction for example. If these forces exceed certain values, the load cells must be

protected.

The force of the weight is transferred to the load cells via elastomer bearings or

oscillation bolts. These elements allow a certain amount of sideways movement of

the load platform or a change in length due to thermal expansion. They generate a

responsive force which centers the load platform position again corresponding with

the occurring movement. This freedom of movement is expressly desired and is also

required for precise weighing. If transverse forces are so high that the responsive

force of the oscillation bolts or the elastomer bearings achieves the permitted

limits, then safety measures are to be taken. These could be oscillation limits or

guide elements (see chapter 1.3). Oscillation limits must be constructed or set so

that the permitted movement, on all sides, cannot be exceeded. In Fig. 1-2, this is

displayed in two examples.

Fig 1-1 Suggested lift

lock solution

Revision 11/12 General Conditions for Installation and Assembly

Document-No.: A5E00295975A Page 8

Load cells of the BB series have oscillation limits integrated in them with the combi-

mounting units.

CAUTION

When using load cells with low nominal loads, overload protection are to be used,

cross-directional as well, in order to protect the cells from damage.

The use of load cells above the maximum working load or the maximum cross-load

can lead to irreparable faults or damage to the load cells or the mounting unit.

1.3 Guide Elements

Guide elements compensate for cross-forces immediately. They allow no sideways

movement of the load platform. At the same time, they cannot change shape when

distances change in the support points (e.g. thermal expansion). Guide element

positioning is shown in Fig. 1-3. They are used if the weight must be determined

under the influence of a transverse force.

Guide elements must be constructed perpendicular to the effective direction of the

load cells so that there are no force components in the direction of measurement.

Stretching the guide elements is best avoided when they are positioned with the

same direction of rotation. To fasten a loading platform or a container in a static

position, three guide elements will suffice. With four guide elements, there is a

danger of these putting force on each other and that this could cause weighing

errors. If four guide elements are used anyway, they should be installed with

enough play to compensate.

The guide elements should correspond with the principles used in the weighing

technology. Ball-pin guides for up to 1000 kN transverse force are also available

upon request.

±2.8

±4

2.8

±4

Limit stop

Drill hole

Bolt

PlatformPlatform

±2.8

±4

2.8

±2.8

±4

2.8

±4

Limit stop

Drill hole

Bolt

PlatformPlatform

Oscillation limiters at a permitted oscillation of 4 mm in a dual weighing

platform example.

Fig. 1-2 Oscillation limit example

Revision 11/12 General Conditions for Installation and Assembly

Document-No.: A5E00295975A Page 9

Fig. 1-3 Guide Positioning

Revision 11/12 General Conditions for Installation and Assembly

Document-No.: A5E00295975A Page 10

1.4 Load Cell Dummies

Load cells are sensitive sensors. To protect them from damage, they should only be

handled as late as possible for installation and transport. During installation and

transport, these should be replaced by dummies or phantoms. Dummies can be

constructed as follows for example:

1. A replica of the mounting element using a welded construction.

A pipe or any other steel profile can be welded between two plates with the

respective hole format for the fastening bolts. The overall height

corresponds with the installation height of the mounting element. This is

the most stable and secure version. Rough assembly work can be

performed.

2. Using a SIWAREX R Combi-mounting unit.

The Combi-mounting units are supplied as completely assembled units. The

units are set at the approximate installation height for an operational unit.

Slight adjustments can be made during the installation.

1.5 Load Cell Handling

DANGER

Load cells and mounting units are not machine elements that are constructed

using standard safety factors. It is therefore absolutely necessary to prepare for the

potential danger with respective supports or other means of protection.

CAUTION

To protect against undesirable electrical current, such as static discharge that can

occur during welding or which can be caused by lighting for example, the load

cells should be bridged with highly flexible grounding cable (e.g. SIWAREX R

ground cable 7MH3 701-1AA1).

SIWAREX R load cells may only be installed and connected by qualified personnel.

Load cells are precision components and are to be handled carefully. Pay special

attention during transport and assembly.

CAUTION

Mechanical jolts or dropping could irreparably damage the load cells.

Load cells are not to be carried by their connecting cables.

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