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Maintenance

5.1

General

Web/strip Tensiometer Systems with Pressductor

load cells are extremely reliable and do not

require daily servicing. As a preventive measure, checks should be done periodically on all parts
subject to mechanical wear.

5.2

Preventive Maintenance

Check mounting screws and tighten if necessary.

The gaps between load cell and plates should be checked to ensure that they do not get clogged
with dirt, causing shunt force past the load cell. Clean the gaps with compressed air if necessary.

The cable between the load cell and the junction box is subjected to possible damage and should
be checked and replaced if necessary.

5.3

Spare Parts

Users are recommended to keep the following spare parts in stock:

•

One load cell of correct type and size.

•

One connector complete with cable (for PTFL 101A and PFTL 101B).

Table 3 Ordering numbers for Load Cell PFTL 101

Description

Type

Nominal load
(kN)

Ordering numbers

Load cell

PFTL 101A

0,5

3BSE004160R1

Load cell

PFTL 101A

1,0

3BSE004166R1

Load cell

PFTL 101A

2,0

3BSE004172R1

Load cell

PFTL 101AE

0,5

3BSE004211R1

Load cell

PFTL 101AE

1,0

3BSE004212R1

Load cell

PFTL 101AE

2,0

3BSE004213R1

Load cell

PFTL 101AER

0,5

3BSE023010R1

Load cell

PFTL 101AER

1,0

3BSE023011R1

Load cell

PFTL 101AER

2,0

3BSE023012R1

Pressductor PillowBlock Load Cells, Horizontal Measuring PFTL 101, User Manual

5 Maintenance

3BSE009965R0401 en Rev E

Содержание PFTL 101

Страница 1: ... ABB MEASUREMENT ANALY TICS Pressductor Pillowblock Load Cells Horizontal Measuring PFTL 101 User manual 3BSE009965R0401 en Rev E ...

Страница 2: ...ponsibility for any errors that may appear in this document In no event shall ABB AB be liable for direct indirect special incidental or consequential damages of any nature or kind arising from the use of this document nor shall ABB AB be liable for incidental or consequential damages arising from use of any software or hardware described in this document This document and parts thereof must not b...

Страница 3: ...e Product 6 1 4 Function and Design 7 1 4 1 General 7 1 4 2 Loads cells PFTL 101 7 1 4 3 Principle of Measurement 8 2 Description 2 1 General 9 2 2 Technical Data 10 2 3 Definitions 11 2 4 Measuring principle of the sensor 14 2 5 Mounting Arrangement 14 2 5 1 Coordinate System 15 2 5 2 Horizontal Mounting 15 2 5 3 Inclined Mounting 16 2 6 The Electrical Circuit 17 3 Installation 3 1 General 18 3 2...

Страница 4: ...27 6 5 Fault Tracing of Load Cells Junction Boxes and wiring 28 A Drawings A 1 Load Cell PFTL 101A 0 5 2 0 kN Dimension Drawing 30 A 2 Load Cell PFTL 101AE 0 5 2 0 kN Dimension Drawing 31 A 3 Load Cell PFTL 101AER 0 5 2 0 kN Dimension Drawing 32 A 4 Load Cell PFTL 101B 2 0 20 kN Dimension Drawing 33 A 5 Load Cell PFTL 101BE 2 0 20 kN Dimension Drawing 34 A 6 Load Cell PFTL 101BER 2 0 20 kN Dimensi...

Страница 5: ...ation measures encryption of data installation of antivirus programs etc to protect the product and the network its system and interface included against any kind of security breaches unauthorized access interference intrusion leakage and or theft of data or information ABB is not liable for any such damages and or losses 1 3 Disposal and Recycling 1 3 1 Environmental Policy ABB is committed to it...

Страница 6: ... depends on the material type and availability of local recycling programs After receiving the system into the site the package and the transportation locking have to be removed Recycle the transport material according to local regulations 1 3 4 Disposal of the Product When the product is to be disposed it should be dismantled and the components recycled according to local regulations 1 3 4 1 Dism...

Страница 7: ... The reactive force from the web strip which is proportional to the web strip tension is transferred to the load cells via the roll and the bearings The load cells are connected to the control unit via a junction box The control unit converts the load cell signals to DC voltages that are proportional to the reaction force Depending on which control unit is chosen it is possible to have the analog ...

Страница 8: ...sion T gives rise to two force components one in the direction of measurement of the load cell FR and one at right angles FV The measuring force depends on the relationship between the tension T and the wrap angle formed by the web strip around the measuring roll T T FR FV W a p an Wrap angle Figure 2 Measuring roll with Force Vectors Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 10...

Страница 9: ...ce in the direction of measurement and insensitive in other directions The load cell types PFTL 101A PFTL 101AE PFTL 101B and PFTL 101BE are made of stainless steel PFTL 101A and PFTL 101B are equipped with a connector for the pluggable connection cable PFTL 101AE and PFTL 101BE are equipped with a fixed connection cable Load cell types PFTL 101AER and PFTL 101BER are specially designed for instal...

Страница 10: ... 40 Permitted axial load within the accuracy FAnom A AE AER 2 5 5 B BE BER 5 10 10 10 Overload capacity Max load in measure ment direction without permanent change of data Fmax A AE AER 2 5 5 10 kN B BE BER 10 25 50 80 Spring constant A AE AER 32 65 130 kN mm B BE BER 130 325 650 1300 Mechanical data Length A AE AER 230 230 230 mm B BE BER 360 360 360 360 Width A AE AER 84 84 84 B BE BER 104 104 1...

Страница 11: ...ange 10 105 C Zero point drift 50 100 1 ppm K Sensitivity drift 250 Storage temperature range 40 105 C 1 Definitions of directions designations V and A in FV and FA are given in 2 5 1 Coordinate System 2 PFTL 101AER 0 5 kN 1 0 kN 2 3 Definitions Nominal load Nominal load Fnom is the maximum load in the measurement direction for which the load cell is dimensioned to measure within the specified acc...

Страница 12: ... drawn between the output values at zero load and nominal load Linearity deviation is related to the sensitivity Signal Force Fnom Figure 6 Linearity Deviation Hysteresis Hysteresis is the maximum difference in the output signal at the same load during a cycle from zero load to nominal load and back to zero load related to the sensitivity at nominal load The hysteresis of a Pressductor transducer ...

Страница 13: ...the load cell are not necessarily maintained in the whole working temperature range Storage temperature range Storage temperature range is the temperature range within which the load can be stored Zero point drift with temperature Zero point drift is defined as the signal change with temperature related to the sensitivity when there is zero load on the load cell Sensitivity drift with temperature ...

Страница 14: ...n of the magnetic field changes so that it surrounds the secondary winding inducing an alternat ing voltage in that winding The control unit converts this alternating voltage into a DC voltage proportional to the applied force If the measurement force changes direction the sensor signal changes also polarity Figure 9 Propagation of magnetic field around secondary winding due to mechanical force on...

Страница 15: ...ure 10 Coordinate system defining directions used in force calculation 2 5 2 Horizontal Mounting In the majority of cases horizontal mounting is the most obvious and easiest mounting method When calculating the force the equations below must be used FR T cos β cos α FRT 0 FRtot FR FRT T cos β cos α FV T sin α sin β FVT Tare FVtot FV FVT T sin α sin β Tare where T Web strip tension FR Force compone...

Страница 16: ...sin α γ sin β γ Tare cos γ where T Web strip tension FR Force component from web strip tension in measurement direction R FRT Force component from Tare in measurement direction R FRtot Total force in measurement direction R FV Force component from web strip tension in transverse direction V FVT Force component from Tare in transverse direction V FVtot Total force in transverse direction V Tare For...

Страница 17: ...rcuit C D A B T 0 5 A 330 Hz R1 R2 Secondary circuit signal supply current Figure 13 Load cell circuit diagram The load cell is supplied with a 0 5 A 330 Hz alternating current The secondary signal is calibrated for the correct sensitivity with a voltage divider R1 R2 and temperature compensation is provided by thermistors T All resistances on the secondary side are relatively low The output imped...

Страница 18: ...here must not be any shims immediately above or below the load cell as this may adversely affect the flatness Instead shims may be placed between the adapter plate and the foundation or between the adapter plate and the bearing housing The screws that secure the load cell must be tightened with a torque wrench The bearing arrangement for the measuring roll must be designed to allow axial expansion...

Страница 19: ...Cells page 21 Information When installing PFTL 101AER and PFTL 101BER adapter plates of austenitic steel must be used preferably acid resistant or stainless steel 3 5 Mounting The instructions below apply to a typical mounting arrangement Variations are allowed provided that the requirements of 3 1 General are complied with If it is necessary to use tubular dowel pins to secure the position of the...

Страница 20: ...adapter plate see Figure 15 Installation of Adapter Plates and Alignment of Load Cells page 21 Table 2 Tightening Torques for Load Cell PFTL 101 Option Type of screws Strength class Type of lubrication Dimension Tightening torque Nm 5 1 Recommended Alloyed steel screws Strength class according to ISO 898 1 12 9 Oil M12 136 M16 333 M20 649 2 Recommended Alloyed steel screws Strength class according...

Страница 21: ...Adapter Plates and Alignment of Load Cells FR FR 90 Top view Adapter plates Thickness PFTL 101A min 30 mm PFTL 101B min 35 mm A A Figure 15 Installation of Adapter Plates and Alignment of Load Cells 3 6 Cabling The cable must not create shunting forces in the measuring direction of the load cell e g forces caused by thermal expansion gravity or similar Pressductor PillowBlock Load Cells Horizontal...

Страница 22: ...shunting forces become as small as possible for instance by securing the cable against the supporting structure Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual 3 Installation 22 3BSE009965R0401 en Rev E ...

Страница 23: ...to the correct torque that all cables are correctly installed and connected that all connectors are plugged in 4 2 Preparatory Calculations To be able to set the correct measuring range the measurement force per load cell FR 2 at maxi mum tension T must be calculated Each load cell is subjected to half the total measurement force FR This calculation must be done before commissioning can begin Calc...

Страница 24: ...ge and should be checked and replaced if necessary 5 3 Spare Parts Users are recommended to keep the following spare parts in stock One load cell of correct type and size One connector complete with cable for PTFL 101A and PFTL 101B Table 3 Ordering numbers for Load Cell PFTL 101 Description Type Nominal load kN Ordering numbers Load cell PFTL 101A 0 5 3BSE004160R1 Load cell PFTL 101A 1 0 3BSE0041...

Страница 25: ...oad cell PFTL 101BE 5 0 3BSE004215R1 Load cell PFTL 101BE 10 0 3BSE004216R1 Load cell PFTL 101BE 20 0 3BSE004217R1 Load cell PFTL 201BER 2 0 3BSE023158R1 Load cell PFTL 201BER 5 0 3BSE023159R1 Load cell PFTL 201BER 10 0 3BSE023160R1 Load cell PFTL 201BER 20 0 3BSE023161R1 Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual 5 Maintenance 3BSE009965R0401 en Rev E 25 ...

Страница 26: ...robust and can withstand five times their nominal load in the meas uring direction If a load cell has nevertheless been so overloaded that its data have been altered this is probably due to an event in the mill such as web strip breakage On exces sive overload the first thing that happens is that the zero point shifts Problems such as interference or unstable zero point may be caused by wiring fau...

Страница 27: ...rip tension indication to be lower than the actual web strip ten sion 6 4 3 Fastening of Load cell and Adapter Plates Screw joints that have not been properly tightened or have lost their pre tightening force cause sliding at the mating surfaces Fastening of the load cell is especially critical If a load cell is not properly secured the zero point will be unstable Sliding between other surfaces ma...

Страница 28: ... after a time The cabling especially the cable to the load cell is the part that is most exposed to damage Since the resistance of the load cell windings is low it is easy to check the load cells and cabling from the control unit Typical readings are 1 Ω for the resistance of the primary winding and 1 3 Ω for the output impe dance of the secondary winding Insulation faults in the cabling or the lo...

Страница 29: ...A Drawings Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 3BSE009965R0401 en Rev E 29 ...

Страница 30: ...A 1 Load Cell PFTL 101A 0 5 2 0 kN Dimension Drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 30 3BSE009965R0401 en Rev E ...

Страница 31: ...A 2 Load Cell PFTL 101AE 0 5 2 0 kN Dimension Drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 3BSE009965R0401 en Rev E 31 ...

Страница 32: ...A 3 Load Cell PFTL 101AER 0 5 2 0 kN Dimension Drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 32 3BSE009965R0401 en Rev E ...

Страница 33: ...A 4 Load Cell PFTL 101B 2 0 20 kN Dimension Drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 3BSE009965R0401 en Rev E 33 ...

Страница 34: ...A 5 Load Cell PFTL 101BE 2 0 20 kN Dimension Drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 34 3BSE009965R0401 en Rev E ...

Страница 35: ...A 6 Load Cell PFTL 101BER 2 0 20 kN Dimension Drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 3BSE009965R0401 en Rev E 35 ...

Страница 36: ...A 7 Adapter Plate Lower PFTL 101A AE AER Dimension drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 36 3BSE009965R0401 en Rev E ...

Страница 37: ...A 8 Adapter Plate Upper PFTL 101A AE AER Dimension drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 3BSE009965R0401 en Rev E 37 ...

Страница 38: ...A 9 Adapter Plate Lower PFTL 101B BE BER Dimension drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 38 3BSE009965R0401 en Rev E ...

Страница 39: ...A 10 Adapter Plate Upper PFTL 101B BE BER Dimension drawing Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Appendix A Drawings 3BSE009965R0401 en Rev E 39 ...

Страница 40: ... 12 linearity deviation 12 nominal load 11 repeatability error 13 sensitivity 11 sensitivity drift 13 with temperature 13 working temperature range 13 zero point drift 13 Pressductor PillowBlock Load Cells Horizontal Measuring PFTL 101 User Manual Alphabetical index 40 3BSE009965R0401 en Rev E ...

Страница 41: ......

Страница 42: ...3BSE009965R0401 en Rev E ABB AB Industrial Automation Force Measurement SE 721 59 Västerås Sweden Tel 46 21 32 50 00 Internet www abb com webtension Measurement Analytics ...

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