REC3858G manual de basculas electronicas ransey

8/16/2019 REC3858G manual de basculas electronicas ransey

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Series 10-17-4

Belt Scale

Installation & Operation Manual

REC‐ 3858 REV G P/N 046178


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Revision History

Revision Number Date Revised ECO Number Revision SpecificsRevision A March 1994

Revision B May 1995Revision C January 1996Revision D November 1998Revision E May 2000Revision F March 2003Revision G August 2013 ECO 3367 Update format/phone no.


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©2006 Thermo Fisher Scientific . All rights reserved.

This document is confidential and is the property of Thermo Fisher Scientific . It may not be copied or

reproduced in any way without the express written consent of Thermo Fisher Scientific . This document

also is an unpublished work of Thermo Fisher Scientific . Thermo Fisher Scientific intends to, and is

maintaining the work as confidential information. Thermo Fisher Scientific also may seek to protect

this work as an unpublished copyright. In the event of either inadvertent or deliberate publication,

Thermo Fisher Scientific intends to enforce its rights to this work under the copyright laws as a

published work. Those having access to this work may not copy, use, or disclose the information in

this work unless expressly authorized by Thermo Fisher Scientific .

Disclaimer

Though the information provided herein is believed to be accurate, be advised that the information

contained herein is not a guarantee for satisfactory results. Specifically, this information is neither a

warranty nor guarantee, expressed or implied, regarding performance, merchantability, fitness, or

any other matter with respect to the products, and recommendation for use of the product/process

information in conflict with any patent. Please note that Thermo Fisher Scientific reserves the right to

change and/or improve the product design and specifications without notice


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TABLE OF CONTENTS

CHAPTER 1 INTRODUCTION .............................................................................................................................. 1‐1

GENERAL .................................................................................................................................................................. 1‐1

DESCRIPTION ............................................................................................................................................................

1‐1

Thermo Fisher Scientific Model 10‐17 ‐4 Carraige/Weighbridge ...................................................................... 1‐1

UNPACKING AND INSPECTION ....................................................................................................................................... 1‐1

STORAGE .................................................................................................................................................................. 1‐2

CHAPTER 2 INSTALLATION ................................................................................................................................ 2‐1

GENERAL .................................................................................................................................................................. 2‐1

SCALE LOCATION CRITERIA ........................................................................................................................................... 2‐1

Wind and Weather Effects ............................................................................................................................... 2‐1

Vibration and Deflections ................................................................................................................................. 2‐1

Conveyor .......................................................................................................................................................... 2‐1

Tension .............................................................................................................................................................

2‐2

Uniform Belt Loading ....................................................................................................................................... 2‐3

Material Slippage ............................................................................................................................................. 2‐3

Convex Curves .................................................................................................................................................. 2‐4

Concave Curves ................................................................................................................................................ 2‐4

Trippers ............................................................................................................................................................ 2‐5

Single Load Point .............................................................................................................................................. 2‐5

Conveyor Belt ................................................................................................................................................... 2‐6

Take‐Ups .......................................................................................................................................................... 2‐6

Belt Tracking .................................................................................................................................................... 2‐6

Scale Service Idlers ........................................................................................................................................... 2‐7

Belt Scale Area Idlers ........................................................................................................................................ 2‐8

Idler Troughing Angles ..................................................................................................................................... 2‐9

Training Idlers .................................................................................................................................................. 2‐9

Idler Alignment ................................................................................................................................................. 2‐9

Cable Conveyors ............................................................................................................................................. 2‐10

WEIGHBRIDGE/CARRIAGE INSTALLATION ...................................................................................................................... 2‐10

Terms .............................................................................................................................................................. 2‐10

Location .......................................................................................................................................................... 2‐11

Site Preparation ............................................................................................................................................. 2‐11

Carriage/Weighbridge Installation ................................................................................................................ 2‐12

Scale Idler Installation .................................................................................................................................... 2‐14

Wiring ............................................................................................................................................................. 2‐17

INITIAL SETUP PROCEDURE ........................................................................................................................................ 2‐17

CHAPTER 3 OPERATION .................................................................................................................................... 3‐1

GENERAL .................................................................................................................................................................. 3‐1

ACCURACY ................................................................................................................................................................ 3‐1

MODEL 10‐17‐4 WEIGHBRIDGE .................................................................................................................................. 3‐3


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SCALE JUNCTION BOX ................................................................................................................................................. 3‐3

CALIBRATION BELT SCALE ............................................................................................................................................ 3‐3

CHAPTER 4 MAINTENANCE ............................................................................................................................... 4‐1

GENERAL .................................................................................................................................................................. 4‐1

SERVICE AND REPAIR INFORMATION .............................................................................................................................. 4‐1

FREQUENT CHECKPOINTS ............................................................................................................................................ 4‐1

TROUBLESHOOTING .................................................................................................................................................... 4‐3

Calibration Shifts .............................................................................................................................................. 4‐3

Zero Calibration Shifts ...................................................................................................................................... 4‐3

Span Calibration Shifts ..................................................................................................................................... 4‐3

Field Wiring ...................................................................................................................................................... 4‐4

CHAPTER 5 REPLACEMENT PARTS .................................................................................................................... 5‐1

GENERAL .................................................................................................................................................................. 5‐1

ORDER INFORMATION ................................................................................................................................................ 5‐1

PARTS LIST ............................................................................................................................................................... 5‐2

LIST OF TABLES & FIGURES

Figure 1‐1. The Carriage/Weighbridge Model 10‐17‐4 .............................................................................................. 1‐1

Figure 2‐1. Conveyor Support Illustration ................................................................................................................. 2‐2

Figure 2‐2. Recommended Installation Area ............................................................................................................. 2‐2

Figure 2‐3. Depth Limiting Gate Illustration .............................................................................................................. 2‐3

Figure 2‐4. Conveyor Speed and Slope Illustration .................................................................................................... 2‐3

Figure 2‐5.

Convex

Curve

Illustration

........................................................................................................................

2‐4

Figure 2‐6. Concave Curve Illustration ....................................................................................................................... 2‐4

Figure 2‐7. Tripper Location Illustration .................................................................................................................... 2‐5

Figure 2‐8. Feed Point Illustration ............................................................................................................................. 2‐5

Figure 2‐9. Take‐Ups Illustration ............................................................................................................................... 2‐6

Figure 2‐10. Belt Tracking Illustration ........................................................................................................................ 2‐7

Figure 2‐11. Scale Service Idler Illustration ............................................................................................................... 2‐7

Figure 2‐12. Idler Type Illustration ............................................................................................................................ 2‐8

Figure 2‐13. Troughing Angle Illustration .................................................................................................................. 2‐9

Figure 2‐14. Cable or Rope Conveyor Illustration .................................................................................................... 2‐10

Figure 2‐15. Carriage/Load Cell Bridge Installation ................................................................................................. 2‐14

Figure 2‐16.

42”

(1067

mm)

through

72”

(1829

mm)

Belt

Width

Weigh

Idler

Modification

..................................

2‐15

Figure 2‐17. 18” (457 mm) through 36” (914 mm) Belt Width Weigh Idler Modification ...................................... 2‐15

Figure 2‐18. Scale Junction Box Outline & Mounting Dimensions .......................................................................... 2‐18

Figure 2‐19. Field Wiring Diagram ........................................................................................................................... 2‐18

Figure 3‐1. 10‐17 Belt Scale Simplified ...................................................................................................................... 3‐2

Figure 3‐2. Scale Area Idlers ...................................................................................................................................... 3‐3


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Thermo Fisher Scientific 1-1REC-3858 Rev G

Chapter 1 Introduction

General This instruction manual contains information on the installation,operation, and maintenance of the Series 10-17-4 Belt Scale.

This instruction manual applies only to the Model 10-17-4 BeltScale that has been purchased.

Description The 10-17-4 Belt Conveyor Scale consists of acarriage/weighbridge assembly. When combined with a Thermo Fisher Scientific Integrator and belt speed sensor, eachserves a distinct function in the process of accurately weighingmaterial moving on the conveyor belt.

Thermo Fisher

Scientific Model 10-

17-4

Carraige/Weighbridge

The Carriage/Weighbridge (Figure 1-1) is a two piece fieldassembled unit consisting of a pivoted carriage and load cellbridge which has been factory aligned, and one subassembledsection of a pivoted carriage with trunnions.

Figure 1-1. The Carriage/Weighbridge Model 10-17-4

Unpacking and

Inspection

The Model 10-17-4 Carriage/Weighbridge has been aligned at thefactory for installation in your conveyor and has been properlypackaged for shipment.

Inspect all packages for damage before opening as often thecarrier may be responsible for shipping damage.


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1-2 Thermo Fisher ScientificREC-3858 Rev G

Storage The 10-17-4 belt scale and associated equipment can be safelystored, with cover latches secured and hole plugs installed,between -58º to +185º F (-50º and +85º C). The units should beprotected against moisture.


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Chapter 2 Installation

General All Thermo Fisher Scientific Belt Conveyor Scales, regardless oftheir applications, are manufactured to the same high degree ofaccuracy and reliability. However, it is the application andinstallation of these scales that determine the overall operatingcapabilities and accuracy that can be realized. The followingguidelines should be employed to insure maximum performanceof the scale. All conditions outlined cannot be adhered to in eachand every installation; however, the more demanding the serviceand performance, the more important and critical is theapplication and installation of the Thermo Fisher Scientific BeltConveyor Scale.

Scale Location

Criteria

In applying belt conveyor scales, one must always considerexternal influences originating from the material handling systemand belt conveyor. Regardless of stated accuracies, these twofactors will determine the overall long-term and short-termaccuracy expected.

Wind and Weather

Effects

The scale and conveyor at the scale should be protected from wind and weather effects. The magnitude of weighing errors

caused by wind is dependent on wind velocity.

Vibration and

Deflections

The entire conveyor frame should be isolated from bins, feeders,crushers, and other mechanical equipment. This is to prevent binloading from causing conveyor defections and to protect the weighing equipment from vibrations and shocks imposed bymechanical equipment.

Conveyor In the design of the scale, several deflections are taken into

consideration. These are the deflection of the load cells, thedeflection of the scale carriage and bridge assembly, and thedeflection of the supporting conveyor structure. It is of utmostimportance that these deflections not be excessive. In themanufacture of the scale, the amount of deflection in the loadcells and the carriage and bridge assembly is controlled. The only variable is the deflection of the conveyor itself. Therefore, theconveyor stringers supporting the scale and two idlers to either


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Rigidly weld stringers

Stringer Stringer

Expansion

Provide ample support A00358

A00310a

side of the scale should be of ample size and be adequatelysupported to limit the relative deflection between +4 and -4 idlersto not more than +0.025 inches (0,64 mm). No conveyorexpansion joints or stringer splices should be located in thisregion of the conveyor. Refer to field installation drawing for

required mechanical supports.

Figure 2-1. Conveyor Support Illustration

Tension In all installations, the belt scale should be installed in an area where belt tension and tension variations are minimal. For thisreason, the belt scale should be installed near the tail section ofthe conveyor, minimum distance 15 feet (4.6 meters), but farenough forward so as not to be influenced by infeed skirt boards.

Figure 2-2. Recommended Installation Area


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Thermo Fisher Scientific 2-3REC-3858 REV G

A00356

A00311a

Uniform Belt

Loading

Although in most applications the scale is capable of operatingaccurately over a 4 to 1 range, it is desirable that the belt loadingbe as uniform as possible. To minimize surges or feed variations,hoppers, if possible, should be equipped with depth limiting gate.

Figure 2-3. Depth Limiting Gate Illustration

Material Slippage When a Thermo Fisher Scientific Integrator is used to processbelt loading and belt travel to arrive at an accurate weight, productspeed must equal belt speed at the scale. For this reason, theconveyor speed and slope should not exceed that at whichmaterial slippage occurs.

Figure 2-4. Conveyor Speed and Slope Illustration


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Convex Curves Convex curves are permissible at a distance of 20 feet (6 meters)or a minimum of five idler spaces beyond the scale area idlers.

Figure 2-5. Convex Curve Illustration

Concave Curves The point of tangency on a concave (upward going) curve mustbe at least 40 feet (12 meters) beyond the scale. The belt scaleshould always be between the infeed and curve.

Figure 2-6. Concave Curve Illustration


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Trippers In any installation where weighing accuracy is important, the scaleshould not be applied to a conveyor that has a movable tripper. Ifthe scale must be installed on a conveyor with a tripper, then thesame rules apply as for an installation in a concave conveyor. Theminimum distances outlined in the above paragraph must be

adhered to with the tripper in its fully retracted position.

Figure 2-7. Tripper Location Illustration

Single Load Point On high accuracy installations, the conveyor should be loaded atone and the same point. This assures constant belt tension at thescale during all loading conditions.

Figure 2-8. Feed Point Illustration


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Conveyor Belt

Take-Ups

For best weighing accuracies, all conveyors more than 40 feet (12meters) in length should be equipped with a constant tension orgravity type take-up. If the conveyor is shorter than 40 feet (12meters) and exposed to changing ambient temperature conditions,or if the loading on such conveyors is not constant, then they also

should be equipped with constant tension take-ups to enhance the weighing accuracy.

Figure 2-9. Take-Ups Illustration

Belt Tracking One problem in obtaining optimum belt scale accuracy is theeffect of belt tracking from an empty to a fully loaded condition. To enhance belt tracking, the construction of the belting shouldhave the necessary flexibility to assure contact with all scale areaidler rolls when the belt is running empty. In addition, this alsoassures that the conveyed material is being supported by the weighing idlers rather than by the carcass of the conveyor belting.In no case should the belt extend beyond the edge of the idlerroller in the weighing area.


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1

2

012

ROLL

DIALINDICATOR

.015"

A00253

Figure 2-10. Belt Tracking Illustration

Scale Service Idlers Idlers in the weighing area should be round, uniform and of samemake, troughing angle and rating. The top grade idler,manufactured by most of the major idler suppliers, under normalconditions, is an adequate idler for scale service use. It may berequired, however, to select a series of idlers that have similardimensions and troughing angles for scale service. Recommend TIR should not exceed 0.015" (0,381 mm).

Figure 2-11. Scale Service Idler Illustration


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No

No

Yes

Rope or

cable support

V type

Offset typeSee noteabove

A00254

Belt Scale Area Idlers The selection of the idlers used within the scale area is extremelyimportant. This pertains not only to the idler type, but the idlerconstruction itself. Since idler alignment plays an extremelyimportant role in the operation of a belt conveyor scale, it isextremely important that all idlers be manufactured as nearly alike

as possible. It is also important that certain types be avoided,such as "V" types and rope or cable types.

NOTE: Offset idlers should not be used on single or dual pivoted carriage/weighbridge type scales (please check with Thermo Fisher Scientific).

Figure 2-12. Idler Type Illustration


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Idler Troughing

Angles

The use of idlers with steep troughing angles causes manyproblems. Not only does the beam or catenary effect of the beltbecome more pronounced as the troughing increases, but theeffect of idler misalignment is amplified as well.

One very important function to perform at the time of installationof the scale is to check out the alignment of all idlers within the weighing area. This is done to help minimize the extraneousforces introduced into the weighing system caused by changes inbelt tension or other external forces as the belt travels across theidlers.

Troughing angles of 35º or less are preferred for all high accuracyinstallations. Troughing angles of 45º are acceptable under certainconditions (please check with Thermo Fisher Scientific).

Figure 2-13. Troughing Angle Illustration

Training Idlers It is extremely important that the belt tracks centrallyfrom no load to full load conditions. Training idlers arenormally acceptable if located beyond 40 feet (12 meters)from the nearest scale weigh idler.

Idler Alignment The weigh idler and four idlers either side of the weighidler are very closely aligned to make as true a weighingplatform or section as possible. It is the installation ofthese idlers that is the most critical. Good idleralignment throughout the entire conveyor is important toassure adequate and true belt tracking under all load


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A00357

conditions. Scale area idlers must be shimmed higherthan the existing belt line.

Cable Conveyors Conveyors commonly known as "cable" or "rope"conveyors are not suitable for electro-mechanical belt

conveyor scale weighing unless a rigid conveyor sectionlong enough to support the scale and scale service idlersis added.

Figure 2-14. Cable or Rope Conveyor Illustration

Weighbridge/Carriage

Installation

This section is to be used as a guide in the installation ofthe Thermo Fisher Scientific Model 10-17-4.

Terms The following terms are referred to in the installationprocedure:

1. Carriage/Weighbridge

The carriage/weighbridge is a factory aligned

assembly consisting of two carriages, one loadcell support beam, and two precision straingauge load cells applied in tension. Thecarriage/ weighbridge will be referred to as weighbridge only for the remainder of thischapter.

2. Weigh Idlers

The weigh idlers refer to those idlers mounteddirectly on the weighbridge.

3. Scale Area Idlers

The scale area idlers refer to the weigh idlers andthe group of idlers located adjacent to and oneither side of the weigh idlers. The idlers areidentified as plus (+) or minus (-) on theinstallation drawing. At least three and as manyas six plus and minus idlers are closely aligned with the weigh idlers. They are considered part


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of the belt scale and play an important role in theoverall belt scale accuracy and operation.

Location Select the scale location by following the outline in theScale Location Criteria section. A partial listing of the

required guidelines follows:1. Install the scale on a rigid conveyor. If not rigid,

additional bracing is required.

2. The first scale mounted idlers should not belocated closer than five idler spaces or 20 feet (6meters), whichever is greater, from end of skirtboards.

3. The scale must not be placed in concave orconvex curves.

4. The scale should not be installed whereconveyor speed and slope causes materialslippage to occur.

5. Locate the scale where it has maximumprotection from the elements.

6. The scale conveyor should not be attached to orhave vibrating devices installed on it.

Site Preparation After determining scale location on the conveyor,proceed with site preparation as follows:

1. Strengthen the conveyor framework. Limit therelative deflection between idlers to not morethan 0.025 inches (0,635 mm). Refer to theinstallation drawing for placement ofrecommended bracing and support legs.

2. Fishplate and weld together all conveyor sectionsin the region of the scale.

3. Level the conveyor in the transverse planebetween the minus 4 and plus 4 idlers.

4. All scale area idlers must be the same make,style, and model, and should be in free-rollingand otherwise good mechanical condition.

5. Locate the exact center of the carry roll on allidlers from minus 4 to plus 4. Permanentlyscribe or punch this center position on eachcarry roll. In addition, perform the same


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procedure on the troughing and wing rolls.

6. Four idlers must have their mounting bracketmodified to be used as weigh idlers. Refer to weigh idler modification drawing (Figure 2-15).

7. On scales for belt widths over 36 inches (915mm), the weigh area idlers (plus 4 to minus 4)should have a strengthening brace from the wingroll brace to the bottom frame. This bracingstrengthens the idler so it will not warp underload. Refer to idler stiffener drawing (Figure 2-15).

8. For ease in equipment installation and alignment,elevate or remove the conveyor belting from thebelt scale area. Belt clearance will be neededfrom at least the minus 5 to plus 5 idler.

9. Remove all idlers from the conveyor section where the weighbridge will be installed. Although not required, in most installations it iseasier to remove all idlers between the plus andminus 4 idlers.

Carriage/Weighbridge

Installation

After scale location selection and site preparation,proceed with installation as follows:

1. Dimensionally locate and mount the minus 4

and plus 4 idler using a known reference point orthe diagonal method. At the same time, shimthese idlers 1/4 inch (6.4 mm) above the beltline. Refer to the installation drawing.

2. On one side of the conveyor, scribe a markequidistant from the minus 4 and plus 4 idlers.

3. Insert the preassembled carriage/load cell bridgeassembly into the conveyor gallery with the fixedtrunnions closest to the tail pulley. Determinethe longitudinal center of the weighbridge andposition exactly 8 inches (203 mm) before the

scribe mark located in Step 2. (The end of theflexure coupling should line up exactly with thescribe mark.) Insert the second carriage andtrunnion assembly in the conveyor gallery. (SeeFigure 2-15.)

4. Establish a conveyor centerline. Extreme careshould be given to this procedure as allmeasurements will be referenced from this


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centerline. If procedure in Step 5 of the SitePreparation section has not been completed, doso at this time.

5. Tie a high quality 30 pound (13.6 kg) testmonofilament line or equivalent, to the base of

the plus 5 idler. Run this alignment line acrossthe center mark on the plus 4 carry roll throughthe scale area and across the center mark on theminus 4 carry roll. Attach a 30 pound (13.6 kg) weight to the end of the line to maintainconstant tension.

6. If necessary, move the minus 4 and plus 4 idlersto position the center of the carry rolls on theconveyor centerline.

7. Check for clearance between the line and all idler

carry rolls. If necessary, add additionalshimming under minus and plus 4 idlers.

8. Position the center mark on the load cell bridgeand the carriage rear member directly below theconveyor centerline with reference to thelongitudinal center established in Step 4 above.

9. Locate and drill holes for fastening the assemblyto the conveyor gallery.

10. Slide assembly back into place and check forbeing level. If shimming is required, it should be

added at this time. Insert bolts and fasten toconveyor.

11. Remove shipping bracket on the carriage/loadcell bridge assembly and attach the flexures withthe supplied hardware.

12. Dimensionally align the second carriage andposition the center mark on the carriage rearmember below the conveyor centerline. Insurethe flexure couplings are in line. (See Figure 2-15.)

13. Locate and drill holes and fasten trunnions toconveyor gallery. If necessary, shim trunnionsuntil flexure hardware can be installed with nostress applied to flexure.


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Figure 2-15. Carriage/Load Cell Bridge Installation

Scale Idler Installation Before proceeding with the scale area idler installation, makesure the following procedures have been completed:

1. Conveyor centerline has been established.

2. Minus 4 and plus 4 idlers are 1/4 inch (6.4 mm)above the normal belt line.

3. The weighbridge is on the conveyor centerline,

level and equidistant from the minus and plus 4idlers.

Proceed with scale area idler installation.

1. Place modified weigh idler on the weighbridgemounting pad adjacent to the load cell supportbridge.

2. Dimensionally align the weigh idler to theadjacent weighbridge support and center thecarry roll on the conveyor center line. Anaccurate measurement is necessary as this weigh

idler becomes the reference point for allremaining idlers. At this time, the weigh idlermust be below the center string line. Do notshim the idler at this time.

NOTE: Make all dimension measurements from thecenter of the grease fittings on the idlers.


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Figure 2-16. 42” (1067 mm) through 72” (1829 mm) Belt WidthWeigh Idler Modification

Figure 2-17. 18” (457 mm) through 36” (914 mm) Belt WidthWeigh Idler Modification


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When locating the second and subsequent idlers, alwaysmake measurements from the idler located in Step 2(reference weigh idler) to avoid cumulative measuringerrors.

3. Dimensionally locate the minus 4 and plus 4

idlers from the reference weigh idler. Place alevel on the carry roll and shim as necessary tolevel the minus 4 and plus 4 idler. This is thefinal location of these two idlers.

4. Install additional string lines across the minus 4and plus 4 troughing or wing rolls. The stringline reference points were established in Step 5of the Site Preparation section.

NOTE: On conveyors wider than 42 inches (1067mm), additional string lines may be necessary to

ensure accurate shimming.5. Install the remaining minus and plus idlers one at

a time, prior to installing weigh idlers. Themeasurement between each idler and thereference weigh idler must be accurate to within+/- 1/32 inch (0,8 mm). All idlers must beshimmed to within +/- 1/32 inch (0,8 mm) ofthe string lines.

NOTE: A combination of shimming and movementof the idler may be necessary to bring the troughingand wing rolls up to the string lines.

EXAMPLE:

Center roll elevation - OK

Left wing roll elevation - Too high

Right wing roll elevation - Too low

This indicates one of two conditions:

a. The idler is tipped down to the right.(Remedy - add shims to the right end of theidler and remove shims from the left end.)

b. The idler is located too far to the right of theconveyor center. (Remedy - shift idler to theleft.)

6. Install the remaining weigh idler following theprocedure in Step 5.

7. Shim the reference weigh idler up to the stringline.

8. This completes the weighbridge and scale service


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idler installation. Prior to removing the stringlines, complete the following checks.

a. Insure measurement between all idlers andreference weigh idler are accurate to within+/- 1/32 inch (0,8 mm).

b. All carry and troughing rolls are shimmed to within +/- 1/32 inch (0,8 mm) of thereference height of the minus 4 and plus 4idlers.

9. Remove all string lines.

10. Position conveyor belt back into place.

11. Install the belt scale integrator following theinstructions given in its manual.

Wiring

Use the Typical Field Wiring Diagram (Figure 2-17) as aguide. Follow your local electrical codes and regulationsfor minimum wire size and routing.

Some critical wiring considerations are:

1. Insure power is off. Load cell wires must beterminated in scale junction box (see Figure 2-16).

2. Do not shorten the load cell cable supplied withthe scale. The wire length is critical for load celltemperature compensation.

3. Do not route load cell or signal cables in thesame conduit with power wires or any largesource of electrical noise.

4. Connect the shields ONLY where shown.

5. Check that all wires are tight in their connectors. This is particularly important for the load cellconnections.

6. Earth ground all enclosures and conduit.

7. Never use a "megger" to check the wiring.

Initial Setup

Procedure

Following mechanical and electrical installation, it isnecessary that you program field data that is specific toyour application into the Thermo Fisher ScientificIntegrator's memory. Refer to your integrator manual forsetup procedures. The setup procedure should becompleted before calibration of your belt scale isattempted.


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Figure 2-18. Scale Junction Box Outline & Mounting Dimensions

Figure 2-19. Field Wiring Diagram

NOTES: READ ALL INSTRUCTIONS BEFORE WIRING SYSTEM.

1. Do not alter length of cable supplied withload cell.

2. Use Belden 8407 or equivalent, 4 conductor,16 AWG, shielded if total length is 200 feet(61.1 meters) or less. Belden 9260 orequivalent, 6 conductor, 20 AWG, shielded iftotal length is 201 to 3,000 feet (61.2 to 914.4meters), and Integrator/Totalizer has"sense" capabilities.


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Chapter 3 Operation

General

Your Thermo Fisher Scientific Series 10-17-4 Belt ScaleSystem is capable of accurate weighing, provided it isinstalled, calibrated, operated, and maintained incomplete accordance with the instructions contained inthis manual.

No single method of calibration is necessarily optimumfor all belt scale installations. Each method has its ownadvantages and disadvantages.

Accuracy

Thermo Fisher Scientific Series 10-17-4 Belt ScaleSystem, Model 10-17-4 Weighbridge with Thermo FisherScientific Integrator, and Thermo Fisher Scientific SpeedSensor:

On factory approved installations, Thermo FisherScientific warrants that the Series 17 High Accuracy BeltScale System will weigh and totalize to a value within +/-1/4% of test value when calibrated against a known test weight, chain or Thermo Fisher Scientific's standardelectronic calibration. The test rate must be between 25and 100% of the scale system's calibrated capacity.

TEST DURATION is defined as:

1. At least three (3) circuits or revolutions of thebelt, and

2. At least 800 counts on the Thermo FisherScientific Integrator, and

3. At least ten (10) minutes running time.

This performance warranty is conditioned upon:

1. Power being applied to the entire system for at

least one hour prior to initiation of the test.

2. The belt running for at least 2 hour prior toinitiation of the test.

3. The entire system being installed, calibrated,operated, and maintained in completeaccordance with this instruction manual.


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Figure 3-1. 10-17 Belt Scale Simplified


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Model 10-17-4

Weighbridge

Model 10-17-4 Weighbridge consists of two pivotedcarriages and two strain gauge load cells. Load celloutput is proportional to weight applied in the weighspan for rate and accumulative total computations.

Scale Junction Box Scale Junction Box is supplied to reduce conduit runs andfor ease of electrical terminations.

Calibration Belt Scale Belt scale calibration procedures are detailed in yourintegrator manual.

Figure 3-2. Scale Area Idlers


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Chapter 4 Maintenance

General

The Model 10-17-4 Belt Scale can be expected to operate preciselyand to hold its calibration for weeks with a minimum ofmaintenance. Upon installation, some calibration shifts may beexpected due to changes in measuring components, conveyor belt,or idlers.

Service and

Repair

Information

The maintenance information in this manual is designed to meetyour service needs. If you should encounter a problem that requirestechnical assistance, you may call Thermo Fisher Scientific Service at800-445-3503.

Thermo Fisher Scientific also provides on-site service technicians toassist customers with installation, set up, initial calibration, customertraining, maintenance, and repair. Contact the Thermo FisherScientific Field Service department at the number given below forcurrent rate schedules and scheduling.

Thermo Fisher Scientific has a repair center located at our plant inMinneapolis, Minnesota. Products that need system checkout orrepair can be returned to the plant with the Return Material Authorization (RMA) form and number received from repair.

Contact our Repair and Returns department at 800-445-3503 to getan RMA number to use on the form.

NOTE: Have your machine model number and serial numberavailable when you call.

FAX (763)783-2525

Technical Assistance 800-445-3503

Field Service 800-445-3503

Return Material Authorization & Repair 800-445-3503

Frequent

Checkpoints

The scale should be checked frequently to determine when

calibration is required. It is recommended that zero calibration bechecked every other day and that calibration be checked every weekfor several months after installation. Observe the results andlengthen the period between calibration checks, depending upon theaccuracy desired.

1. Cleaning

Keep scale area clean of rocks, dust, and material build-up.


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2. Lubrication

The weigh idlers should be greased once or twice yearly.Overloading the weigh idlers with grease may change the tare weight and place the scale out of calibration. Zerocalibration is necessary after greasing.

3. Belt Training

The belt must be trained to run true to the center line of theidlers in the area of the scale while running empty, as well asunder loaded conditions. Where this cannot beaccomplished due to off-center loading, the loading shouldbe modified.

Where a belt does not train while empty but does train whileloaded, it will be necessary to train the belt over the scale areaat least during the calibration checks.

4. Belt Tension

It is important that conveyor conditions remain constant atall times. Therefore, gravity-type take-ups are recommendedon all conveyors where belt scales are installed. Conveyors which do not have a constant tension device will requirecalibration whenever the belt tension changes and the take-up is readjusted.

5. Belt Loading

Extreme loading conditions which cause flow rate of materialto be above 125 percent of the instrument range must beavoided. Any load capacity above this amount cannot bemeasured. Belt loading should be adjusted to stay within theinstrument range.

Conversely, very low flow rates, with respect to full scalerange, may produce low accuracy.

Where extreme high or low flow rates, as described above,persist, the scale range should be changed.

6. Material Sticking to the Belt

Material may form a film on the belt which is carriedcontinually around the belt and is never discharged. This

condition is often true when handling wet, fine material. Beltscrapers may correct this condition.

If the film cannot be removed, the zero will have to beadjusted. Any change in the build-up of the film adhering tothe belt will require further adjustment.

7. Skirtboards and Covers

Skirtboards should never be placed closer to the weigh idlers


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than the +4 or -4 idler. If skirts or covers are absolutelynecessary in the weighing area, they must not place anyexternal forces on the scale. Even though the skirts are clearof the belt under "no load" conditions, material will jam orslide between the boards and the belt when the conveyor is

operating. Errors of several percent must be expected wheresuch conditions exist.

Troubleshooting If your belt scale fails to operate correctly during or after performingset up and calibration, it is suggested to perform the procedure again,and if the problem persists, follow the troubleshooting proceduresbelow.

Calibration Shifts Frequent calibration shifts should be isolated to zero shifts or spanshifts.

Zero Calibration

Shifts

Zero shifts are normally associated with the conveying system. When a zero shift occurs, the span will shift by a like number of TPH, this then appears as a span shift.

Common causes of zero shifts:

1. Material build-up on the carriage/weighbridge assembly.

2. Rocks lodged in the carriage/weighbridge.

3. Conveyor belt tracking.

4. Non-uniform conveyor training.

5. Conveyor belt belting stretch due to material temperature variations.

6. Trouble in the electronic measuring components.

7. Severely overloaded load cell.

Span Calibration

Shifts

Span shifts are normally associated with the electronic measuring ofcomponents of the system, with one exception, which is conveyorbelt tension. A span shift is present if both points change by thesame percentage TPH.

Common causes of span shifts:1. Change in conveyor belting tension.

2. Speed sensor roll build-up and/or slipping.

3. Conveyor scale alignment.

4. Severely overloaded load cell.

5. Trouble in electronic measuring components.


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Field Wiring 1. Check for proper interconnection between components ofthe system. All wiring must be as specified on the Field Wiring drawing.

2. Check all wiring and connections for continuity, shorts, and

grounds using an ohmmeter.CAUTION: DO NOT USE A MEGGER FORCHECKING FIELD WIRING.

3. Loose connections, poor solder joints, shorted or broken wires and unspecified grounds in wiring will cause erraticreadings and shifts in weight readings.

4. Check that grounding of all cable shields is made at only thelocations as specified on the Field Wiring drawing.


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Chapter 5 Replacement

Parts

General This chapter gives information on how to order replacement partsfor your 10-17 Belt Scale.

Order

Information

For faster service when ordering parts, fax or telephone ThermoFisher Scientific Parts Department.

The recommended procedure for ordering parts is as follows:

1. Determine the broken or faulty part(s).

2. Locate the part(s) in the parts list given.

3. Find the part number(s) for the item(s) needed and determinethe quantity you require.

4. Write or telephone:

Thermo Fisher ScientificCustomer Service Department501 90th Ave. NWMinneapolis, MN 55433Phone: 800-445-3503Fax:(763)783-2525

Normal Customer Service hours are 8:00 a.m. to 4:30 p.m.,Central Time.

5. With your order, list the following information:

Scale model

Purchase order number

Date required

Method of shipment preferred

List of parts, including part number, description and

quantity Your parts order will handled as expeditiously as possible


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Parts List EQUIPMENT PART NUMBERLOADCELL

100 lb. Load Cell 046914



1000 lb. Load Cell 0469172500 lb. Load Cell 046918

100 lb. Installation Kit 050080

250-2500 lb. Installation Kit 050079

MISC

Bushing, rubber, plated, 20 mm 058589


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REC3858G manual de basculas electronicas ransey

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