Siemens Milltronics MUS Operating Instructions Manual

Belt Scales

Milltronics MUS Belt Scale

Operating Instructions 06/2012

Milltronics

Safety Guidelines

Warning notices must be observed to ensure personal safety as well as that of others, and to protect the product and the connected
equipment. These warning notices are accompanied by a clarification of the level of caution to be observed.

Qualified Personnel

This device/system may only be set up and operated in conjunction with this manual. Qualified personnel are only authorized to install
and operate this equipment in accordance with established safety practices and standards.

Unit Repair and Excluded Liability:

 The user is responsible for all changes and repairs made to the device by the user or the user’s agent.
 All new components are to be provided by Siemens Milltronics Process Instruments.
 Restrict repair to faulty components only.
 Do not reuse faulty components.

Warning: Cardboard shipping package provides limited humidity and moisture protection. This product can only function properly

and safely if it is correctly transported, stored, installed, set up, operated, and maintained.

This product is intended for use in industrial areas. Operation of this equipment in a residential area may cause interference to
several frequency based communications.

Note: Always use product in accordance with specifications.

Copyright Siemens AG 2012. All Rights Reserved Disclaimer of Liability

This document is available in bound version and in
electronic version. We encourage users to purchase
authorized bound manuals, or to view electronic versions as
designed and authored by Siemens Milltronics Process
Instruments. Siemens Milltronics Process Instruments will
not be responsible for the contents of partial or whole
reproductions of either bound or electronic versions.

MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments.

While we have verified the contents of this
manual for agreement with the instrumentation
described, variations remain possible. Thus we
cannot guarantee full agreement. The contents of
this manual are regularly reviewed and
corrections are included in subsequent editions.
We welcome all suggestions for improvement.

Technical data subject to change.

Contact SMPI Technical Publications European Authorized Representative
at the following address:

Technical Publications Siemens AG
Siemens AG Industry Sector
Siemens Milltronics Process Instruments 76181 Karlsruhe
1954 Technology Drive, P.O. Box 4225 Deutschland
Peterborough, Ontario, Canada, K9J 7B1
Email: [e-mail]

 For a selection of Siemens Milltronics level measurement manuals, go to:

www. siemens.com/processautomation. Under Process Instrumentation, select
archive listed under the product family.

Level Measurement

and then go to the manual

 For a selection of Siemens Milltronics weighing manuals, go to:

www. siemens.com/processautomation. Under Weighing Technology, select
manual archive listed under the product family.

Continuous Weighing Systems

and then go to the

© Siemens AG 2012

Milltronics MUS

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Milltronics

Belt Scales
Milltronics MUS

Operating Instructions

_________________

Introduction

_________________

Safety notes

_________________

Description

_________________

Installing/mounting

_________________

Connecting

_________________

Commissioning

_________________

Service and maintenance

_________________

Technical data

_________________

Dimension drawings

1

2

3

4

5

6

7

8

9

06/2012

7ML19985CQ02-02

Legal information

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

with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.

CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.

NOTICE
indicates that an unintended result or situation can occur if the relevant information is not taken into account.

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.

Siemens AG

Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY

Order number: 7ML19985CQ02
Ⓟ 06/2012 Technical data subject to change

Copyright © Siemens AG 2012.
All rights reserved

Table of contents

1 Introduction................................................................................................................................................ 5

1.1 The manual ....................................................................................................................................5

2

Saf

ety notes............................................................................................................................................... 7

2.1 General safety inst

3 Descript

3.1 Introduction ..............................................................................................................

3.2 Principle of operation

4 Installing/mounting.........................................................................................................

4.1 Introduction ..............................................................................................................

4.2 Conveyor Cons

4.2.1 Control gates................................................................................................................................12

4.2.2

4.2.3 Head pulley ..................................................................................................................................12

4.2.4

4.2.5 Belt ploughs .................................................................................................................................16

4.2.6

4.2.7 Conveyor trippers

4.2.8 Skirt boards and sealing strips.....................................................................................................17

4.3

4.4 Installation prec

4.5 Installation Proc

4.5.1 Installation int

4.5.2 Remove the idler........................................................................................................

4.5.3 Remove the id

4.5.4 Idler mounting ..............................................................................................................................20

4.5.5

4.5.6 Position the scale

4.5.7 Release the shipping stops..............................................................................................

4.5.8 Align and level the idlers..............................................................................................................27

4.5.9

ion................................................................................................................................................. 9

Conveyor belting

Conveyor c

Stacke

Load cell handling ........................................................................................................

Position the weighmodule

Check alignment .........................................................................................................

urvature......................................................................................................................15

r conveyors .......................................................................................................................16

ructions ............................................................................................................7

......................9

.....................................................................................................................9

.......................... 11

....................11

iderations.............................................................................................................11

..........................................................................................................................12

.........................................................................................................................16

autions ................................................................................................................18

edure ..................................................................................................................19

roduction ................................................................................................................19

ler foot plate and modify the idler frame at both ends ..........................................20

............................................................................................................24

.........................................................................................................................25

................17

..................19

............26

.................28

5 Connecting ...................................................

5.1 Belt sca

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

le wiring ...........................................................................................................................29

........................................................................................... 29

3

Table of contents

6 Commissioning ........................................................................................................................................ 31

6.1 Calibration ................................................................................................................................... 31

6.2 Test load...................................................................................................................................... 31

6.3

6.4

6.5 Zero ca

Balancing..................................................................................................................................... 32

Final calibration .........................................................................................................

.................. 32

libration ........................................................................................................................... 33

6.6 Span calibration .......................................................................................................................... 33

6.7

Material test.............................................................................................................

.................... 33

6.8 Re-rating...................................................................................................................................... 33

7 Service and maint

ce ........................................................................................................................ 35

enan

7.1 Maintenance................................................................................................................................ 35

7.2

Replacing a load cell

................................................................................................................... 36

7.3 Spare parts.................................................................................................................................. 36

7.4

8

Technical

8.1 Specifications ............................................................................................................

9 Dimension dr

Technical support........................................................................................................................ 37

data ......................................................................................................................................... 39

.................. 39

awings ................................................................................................................................ 43

9.1 Outline dimensions........................................................................................................

.............. 43

Milltronics MUS

4 Operating Instructions, 06/2012, 7ML19985CQ02-02

Introduction

1.1 The manual

Note

The Siemens weighing system is to be used only in the manner outlined in this manual,
otherwise protection provided by equipment may be impaired.

 It is your responsibility to read this manual before installing and starting up any

component of the weighing system to which the belt scale is being applied.

This manual covers only belt scale installation, operation, and maintenance procedures.
Integrator and speed sensor operating instructions are available for download from our website:

Siemens weighing (http://www.siemens.com/weighing

Follow these operating instructions for quick, trouble-free installation, and maximum accuracy
and reliability of your weighing system.

We always welcome suggestions and comments about manual content, design, and
accessibility. Please direct your comments to:

1

)

Technical publications (mailto:[e-mail]

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

)

5

Introduction

1.1 The manual

Milltronics MUS

6 Operating Instructions, 06/2012, 7ML19985CQ02-02

Safety notes

2.1 General safety instructions

CAUTION

Correct, reliable operation of the product requires proper transport, storage, positioning and
assembly as well as careful operation and maintenance. Only qualified personnel should
install or operate this instrument.

Note

Alterations to the product, including opening or improper repairs of the product, are not
permitted.

If this requirement is not observed, the CE mark and the manufacturer's warranty will expire.

2

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Operating Instructions, 06/2012, 7ML19985CQ02-02

7

Safety notes

2.1 General safety instructions

Milltronics MUS

8 Operating Instructions, 06/2012, 7ML19985CQ02-02

Description

3.1 Introduction

Milltronics MUS Belt Scale

Milltronics MUS is a modular, medium to heavy-duty belt conveyor scale providing dynamic
weighing information for process indication. The MUS includes a left and a right weigh module,
with one load cell each.

3

The addition of an idler (supplied and installed by the customer) to the weigh module completes
the weighing assembly. The MUS load cells provide an electronic signal, proportional to load,
which is fed to the Siemens integrator. Thus, weighing is accomplished without interrupting the
process and without affecting the process material.

3.2 Principle of operation

Belt scales work with an existing belt conveyor and the selected Siemens integrator. As material
moving along the conveyor belt travels over the belt scale, it exerts a force proportional to the
material load through the suspended idler to the load cells.

The belt scale reacts only to the vertical component of the applied force. The resulting
movement in each load cell is sensed by its strain gauges. When the strain gauges are excited
by voltage from the electronic integrator, they produce an electrical signal proportional to weight,
which is then returned to the integrator. The vertical movement of the load cells is limited by the
positive overload stop incorporated into the design of the belt scale.

Milltronics MUS
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9

Description

3.2 Principle of operation

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10 Operating Instructions, 06/2012, 7ML19985CQ02-02

Installing/mounting

4.1 Introduction

CAUTION

Installation shall be performed only by qualified personnel in accordance with local
governing regulations.

The belt scale is shipped from the factory as a single unit packed in a container for protection.
The weigh module must be removed from its package and inspected for physical damage. Be
sure the conveyor design meets the installation requirements for the belt scale.

Note
 Use only approved conduit and conduit fittings or cable glands to maintain NEMA or IP

rating, as applicable.

 Adjust conveyor stringers to be rigid, straight, parallel to, and square with the belt line in

the area of the scale installation.

 Adjust pulleys to ensure that the conveyor belt tracks straight and centrally from the head

to the tail pulley.

 The idler to be used on the scale and at least the next two approach and retreat idlers,

must be of the same style and manufacturer, and in good condition.

4

Prepare the site in accordance with the Siemens drawing(s) or by referring to the Belt Scale
Applications Guidelines (7ML19985GA01).

4.2 Conveyor Considerations

The ideal placement of the belt scale depends on the conveyor system. This section provides
guidelines to determine belt scale placement.

Milltronics MUS
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11

Installing/mounting

4.2 Conveyor Considerations

4.2.1 Control gates

The installation of a material feed control gate or similar device improves uniform flow of
material.







① Control gate
② Uniform material distribution
③ Belt scale

Note

Ensure steady and uniform material loading to the belt at or near the same speed as the
conveyor belt.

4.2.2 Conveyor belting

Variations in the number of belt plies, the cover thickness and the type and number of splices in
a given belt cause considerable change in the weight per unit length of the belt. During the
course of zero calibrations, belt scales average the weight of the belt over one complete circuit
of the belt. Large deviations from the average adversely affect the zero calibrations.

4.2.3 Head pulley

Note

Use caution when installing a scale in a short conveyor, or when locating the scale near the
head pulley.

Since head pulleys are flat faced, and carrying idlers are generally troughed, the belt profile must
change from troughed to flat in a short distance. To accommodate this, the conveyor
manufacturer designs a built-in vertical displacement of the head pulley above the top of the
center roll of the adjacent idler.

Milltronics MUS

12 Operating Instructions, 06/2012, 7ML19985CQ02-02

Installing/mounting

4.2 Conveyor Considerations

● Insert idlers of decreasing trough angles between the head pulley and the normal run of
idlers or there will be a considerable amount of stress on the belt edges and the idlers
adjacent to the head pulley. The stress is transmitted to the scale.

Note

On conveyors with 20° trough idlers throughout, a minimum of two fixed 20° idlers must
be located between the scale idler and the head pulley.









① 20º idlers
② Minimum 3 idler spaces
③ Head pulley
④ Belt scale

Note

On conveyors with 35° trough idlers throughout, a minimum of two 35° and one 20°
retreat idlers must be located between the scale and the head pulley.













① 35º idlers
② Minimum 4 idler spaces
③ Head pulley
④ 20º idler
⑤ 35º idlers
⑥ Belt scale

Note

On conveyors with 45° trough idlers throughout, a minimum of two 45°, one 35°, and one
20° retreat idlers must be located between the scale and the head pulley.

Milltronics MUS
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13

Installing/mounting

4.2 Conveyor Considerations





7









① 45º idlers
② Minimum 5 idler spaces
③ Head pulley
④ 20º idler
⑤ 35º idler
⑥ 45º idlers
⑦ Belt scale

Note

The vertical displacement of the head pulley relative to the adjacent retreat idler is
normally in excess of that which is acceptable for belt scale installations.

When locating the scale close to the head pulley, a maximum of 13 mm (½") vertical
displacement between the top of the head pulley and the top of the center of the adjacent
roll is allowed.



① 13 mm (1/2") maximum
② Head pulley
③ 20° idler, center roll

Milltronics MUS

14 Operating Instructions, 06/2012, 7ML19985CQ02-02



Installing/mounting

4.2 Conveyor Considerations

4.2.4 Conveyor curvature

Vertical curvature (varied heights on one belt) is common in conveyor design, but creates
difficulties for belt scales if not dealt with correctly. The curvature, whether concave (internal) or
convex (external), disturbs the idler alignment, if the scale is installed in the area of curvature.
The concave curve tends to lift the belt off of the idlers in the area of curvature as belt loading
decreases, adversely affecting the zero calibration.

Concave

Note

Avoid locating the scale within the tangents of scale curvature.

Convex





① Minimum 12 m (40 ft)
② Tangents
③ Belt scale





① Minimum 6 m (20 ft)
② Minimum 12 m (40 ft)
③ Tangents
④ Belt scale













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15

Installing/mounting

4.2 Conveyor Considerations

4.2.5 Belt ploughs

Belt ploughs or any conveyor or material control device that changes the profile of the carrying
belt in or near the scale area is not recommended. These devices can negatively affect the belt
scale idler alignment and usually create drag on the belt which the scale senses as a material
force of load.

Note

Do not install the scale within 9 m (30 ft) of belt ploughs or similar devices that contact the
material or belt.

4.2.6 Stacker conveyors

Any conveyor that is not a permanent structure, which varies in its incline, elevation or profile is
not considered a good installation for an accurate belt scale. A belt scale can be used effectively
in this conveyor type, but requires special setup. Siemens offers an inclinometer for use with
variable incline conveyors.

4.2.7 Conveyor trippers

Note

On a conveyor with a tripper car, locate the scale under the recommendations for vertical
curves, but with the tripper fully retracted.

Milltronics MUS

16 Operating Instructions, 06/2012, 7ML19985CQ02-02

Installing/mounting

4.3 Load cell handling

4.2.8 Skirt boards and sealing strips

Sometimes it is necessary to extend the infeed skirt boards and sealing strips the full length of
the conveyor. This can create problems in weighing accuracy if the sealing strips exert excess
force when contacting the belt and indirectly upon the idlers, especially where pinching occurs.
The situation adversely affects the zero calibrations.









① Skirt board
② Sealing strip dragging along belt
③ Pinching can occur here
④ Idler

Note

If possible, remove skirting in scale area. If not, adjust skirting so sealing strip does not put
excess force on the belt or allow pinching of material.

4.3 Load cell handling

The MUS belt scale is designed for low to high-capacity operation and is constructed using two
load cells. Although the load cells are protected by shipping stops that keep the cells from
moving, care should be taken when handling the scale to avoid damaging the cells. The stops
are metal strips about 38 mm long (1.5") for the standard duty, 107 mm long (4.25") for the
heavy duty, with holes at each end for screws. One screw holds the stop to the dynamic section
while the other screw holds the stop to the static section. When handling the MUS during
installation and setup, make sure the stops remain in place. Reinstall both shipping stops during
maintenance or prolonged shutdown.

Milltronics MUS
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17

Installing/mounting

4.4 Installation precautions

4.4 Installation precautions

The following precautions should be observed when handling the scale.

● Do not pry on the idler, its mountings, or the cells directly.

● Do not stand or lean on the scale.

● Avoid shock from blows of a hammer when trying to position the scale during installation.

● Do not lift the scale by its idler.

● Do not lift the scale by the idler mounting brackets.

Note

For general safety and best system performance, the belt scale must be grounded
through the conveyor and the conveyor must be grounded to earth.

CAUTION

Arc welding

Use extreme caution when arc welding in the area of the belt scale. Ensure that no welding
current can flow through the belt scale. Welding currents passing through the scale can
functionally damage the load cells.

Milltronics MUS

18 Operating Instructions, 06/2012, 7ML19985CQ02-02

Installing/mounting

4.5 Installation Procedure

4.5 Installation Procedure

4.5.1 Installation introduction

The MUS installation has eight steps:

1. Remove the idler(s)

2. Remove the idler foot plate

3. Idler mounting

4. Position the weigh module

5. Position the scale

6. Release the shipping stops

7. Align and level the idlers

8. Check alignment

4.5.2 Remove the idler

Remove the idler(s) from the desired location on the conveyor.

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

19

Installing/mounting

4.5 Installation Procedure

4.5.3 Remove the idler foot plate and modify the idler frame at both ends

Remove the idler foot plate and modify the idler frame at both ends of the idler as shown below.
Occasionally, in less than 5% of applications, the combined effect of the idler rework and the
clamping of the scale at its inboard mounting position could result in abnormal idler vibration.
When this occurs, gusset plate reinforcements should be welded to the idler at the joints of the
horizontal spine and the outer vertical leg member.

 

12.7 mm
(0.5")



① Before
② After
③ See notes below

Note

Cut idler support as shown to allow clearance when the load is applied.

4.5.4 Idler mounting

The belt scale is usually installed in conveyors employing conventional rigid structure idlers.
Within this type of idler, construction will vary depending on the manufacturer and the
application. The idler depicted in this section uses an angle iron spine. The following images
depict alternate idler construction and tips on how they should be modified and installed.

Milltronics MUS

20 Operating Instructions, 06/2012, 7ML19985CQ02-02

Installing/mounting

4.5 Installation Procedure

● Troughed idler with channel spine







① Gusset reinforcement if required ③ 12.7 mm (0.5")
② 100 mm (4")

Idler modification









① Optional flat bar weight mounting ③ Idler clip
② Customer's idler ④ Mounting bolts

Idler installation

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21

Installing/mounting

4.5 Installation Procedure

● Troughed idler with pipe spine







① Gusset reinforcement if required ③ 12.7 mm (0.5")
② 100 mm (4")

Idler modification









① Optional flat bar weight mounting ③ Idler clip
② Customer's idler ④ Mounting bolts

Idler installation

Milltronics MUS

22 Operating Instructions, 06/2012, 7ML19985CQ02-02

Installing/mounting

4.5 Installation Procedure

● Troughed idler with angle spine







① Gusset reinforcement if required ③ Idler clip
② 100 mm (4")

Idler modification









① Optional flat bar weight mounting ③ Idler clip
② Customer's idler ④ Mounting bolts

Idler installation

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Installing/mounting

4.5 Installation Procedure

4.5.5 Position the weighmodule

Position the weigh modules so that the center of the scale idler is centered between the adjacent
approach and retreat idlers.
Ensure that the scale is centered and square to the stringers and idler, and clamping brackets
have suitable clearance.











① Dimension 'n'
② approach idlers
③ location of removed idler
④ retreat idlers

Note

Be sure there is sufficient clearance between the return belt, MUS, and its test weight (when
used during the calibration procedure).

Milltronics MUS

24 Operating Instructions, 06/2012, 7ML19985CQ02-02

Installing/mounting

4.5 Installation Procedure

4.5.6 Position the scale

Mark the position and make new mounting holes suited for M12 (1/2") bolts. Refer to the Outline
Dimensions.

Place the scale on the conveyor stringers with the arrows on the weigh modules pointing in the
direction of belt travel (retreat idlers). Mount the modified idler onto the scale using the idler
clamping brackets.



① Idler clamping brackets

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Installing/mounting

4.5 Installation Procedure

4.5.7 Release the shipping stops

Release the shipping stops in order to free the weighing mechanism. Loosen 'A' screws and
rotate both shipping stops downward until the shipping stop is 180 degrees from its starting
position. Tighten screws to secure in place.





① 'A' screws
② shipping stops

Note

Shipping bracket must be removed prior to aligning the idlers in the weighing area.

Milltronics MUS

26 Operating Instructions, 06/2012, 7ML19985CQ02-02

Installing/mounting

4.5 Installation Procedure

4.5.8 Align and level the idlers

Align and level the idlers properly by shimming the scale idler, the two approach idlers, and the
two retreat idlers, until they are within ± 0.8 mm (1/32") of each other. Check that the idlers are
centered and squared to the conveyor during the shimming process.











① center of idlers to be in line
② A2 to R2 ± 0.8 mm (1/32")
③ reference
④ Idlers must be square to stringers
⑤ adjust idler last

Note

Precise idler alignment is very important to achieve maximum accuracy of the weighing
system. Misaligned idlers will result in unwanted forces being applied on each idler in the
weighing area, causing calibration and measurement errors.

Milltronics MUS
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27

Installing/mounting

4.5 Installation Procedure

4.5.9 Check alignment

Use a good quality wire or string to check for alignment. The wire or string must be able to
withstand sufficient tension in order to eliminate any sag. Adjust shims so that all rolls of the A2
through to the R2 idlers are in line within ± 0.8 mm (1/32").



S1

A1

A2

R2

R1



① MUS with modified idler
② wire or string (for alignment)

Although the accepted tolerance for idler alignment is ± 0.8 mm (1/32"), the scale-mounted idler
should never be lower than the adjacent idlers. Establishing good idler alignment is the most
important part of the installation procedure. Scale accuracy is directly affected by alignment.

Milltronics MUS

28 Operating Instructions, 06/2012, 7ML19985CQ02-02

Connecting

5.1 Belt scale wiring



5





① Load cells, complete with 3 m (10 ft) cable in flexible conduit with 1/2" NPT panel connector
② Load cell 'B'
③ Load cell 'A'

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29

Connecting

5.1 Belt scale wiring

Load cell MUS Milltronics Integrator SIWAREX FTC

A

RED + EXC + EXC
BLK - EXC - EXC
WHT - SIG 'A' - SIG
GRN + SIG 'A' + SIG
SHIELD SHIELD SHIELD

B

RED + EXC + EXC
BLK - EXC - EXC
WHT - SIG 'B' - SIG
GRN + SIG 'B' + SIG
SHIELD SHIELD SHIELD

Note

To avoid affecting the weighing process, do not support conduit or load cell cables on the
weighing idler, or on the idler support components of the belt scale.

Milltronics MUS

30 Operating Instructions, 06/2012, 7ML19985CQ02-02

Commissioning

6.1 Calibration

After all parts of the weighing system (belt scale, speed sensor, integrator) have been properly
installed and connected, the weighing system and integrator must be calibrated. The calibration
is initially done using the test weight(s), however material tests are recommended to achieve the
greatest accuracy. Refer to the integrator operating instructions for programming and calibration
details and for information about material tests. All operating instructions are available for
download at our web site:

Siemens weighing (http://www.siemens.c

6.2 Test load

The test load value is required for calibration of the integrator. Enter the calculated value into the
associated programming parameter of the integrator in kilograms per meter or pounds per foot.

The test load value is calculated as follows:

Test load = test weight mass

idler spacing

where idler spacing = L/2 [minimum 0.6 m (2.0')]

kg or lb

m ft

om/weighing

6

)

$

$

① Dimension L

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

6

5



5

31

Commissioning

6.3 Balancing

6.3 Balancing

For applications where the conveyor loading does not repeat in locations across the width of the
belt, such as side-to-side loading, electronic balancing of the two load cells is recommended.
Balancing is completed during the initial start-up, but should be repeated if either load cell is
reinstalled or replaced. Refer to the associated integrator manual to complete the balancing
procedure.

When balancing load cells, apply a test weight to the extreme sides (side A or B), as required.



① Test weight bracket
② Test weight (calibration flat bar)

Note

Position the test weight flush with the sides of the brackets when balancing load cells.
Reverse position of bar to balance other load cell.

6.4 Final calibration

Program the belt scale integrator as suggested in its operating instructions and with parameters
suitable for the application. With programming complete, the system is ready for calibration.

A zero calibration can be performed after sufficient running of the conveyor allows the belt to
limber up and take its natural formation. A zero calibration is performed in accordance to the belt
scale integrator operating instructions with the conveyor running empty.



Milltronics MUS

32 Operating Instructions, 06/2012, 7ML19985CQ02-02

Commissioning

6.5 Zero calibration

6.5 Zero calibration

Perform the zero calibration as described in the Calibration section of the integrator operating
instructions.

After the completion of the zero calibration, a span calibration, as described in the belt scale
integrator operating instructions, can be performed with the test weight(s) applied. Be sure to
stop the conveyor when applying and removing the test weight.

6.6 Span calibration

1. The span reference (test load) is simulated using the test weight.

2. Apply the calibration test weight(s) to the scale.

3. Perform the span calibration as described in the Calibration section of the integrator
operating instructions.

After completing the span calibration, remove the test weights and store them. With a successful
zero and span calibration, and with the test weight(s) removed from the belt scale, the belt scale
system is ready for operation. Ensure that the belt scale integrator is left in RUN mode.

6.7 Material test

To achieve accuracy with respect to absolute values, perform material tests. Refer to the
associated integrator manual for instructions on material testing.

6.8 Re-rating

Consult your Siemens representative for any significant change in rate, speed, and/or idler
spacing from original design specifications to maintain proper design parameters.

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

33

Commissioning

6.8 Re-rating

Milltronics MUS

34 Operating Instructions, 06/2012, 7ML19985CQ02-02

Service and maintenance

7.1 Maintenance

Keep the weighing equipment clean. Accumulation of material between the fixed support frame
(static) and the live frame (dynamic) as well as around each load cell could affect the scale
accuracy.

Periodically check the alignment of the stringers and idlers in the weighing area.

When a problem arises in the conveyor, it is possible that the scale will be affected. Therefore,
periodic conveyor maintenance is important to proper scale operation which should include:

● lubrication of all pulleys and idlers

● proper belt tracking and training

● proper belt cleaning and scraping

● proper take up operation

● proper material feeding and spillage control

You can observe the integrity of the load cells by performing zero and span calibrations. If the
zero and span deviations display a continuous unidirectional drift or the system cannot be
calibrated for any apparent mechanical reason, the load cells may be damaged.

7

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

35

Service and maintenance

7.2 Replacing a load cell

7.2 Replacing a load cell

CAUTION

Re-install the shipping stops during maintenance or any other time when protection of the
load cells is required.

1. Install both shipping stops

2. Support the belt and weighing idler from above or below.

3. Remove load cell hardware from the dynamic (moving) parts.

4. Remove load cell hardware from the static support.

5. Remove the existing load cell from the belt scale.

6. Replace with a new load cell fastening to static support then dynamic (moving structure).

7. Remove belt and idler support.

8. Release both shipping stops

9. Adjust idler alignment if necessary.

10. Perform balance, zero, and span calibrations.

Note

The load cell stop is set at the factory to allow the load cell to deflect up to 150% of its design
load (30 mV at 10 V DC excitation). The overload gap for a replacement load cell should be set
by mV readings.

7.3 Spare parts

The only spare part recommended for the belt scale is the load cell. Refer to the load cell
nameplate for the proper size and model number. Re-balance any load cell that has been
replaced.

Milltronics MUS

36 Operating Instructions, 06/2012, 7ML19985CQ02-02

Service and maintenance

7.4 Technical support

7.4 Technical support

If you have any technical questions about the device described in these Operating Instructions
and do not find the right answers, you can contact Customer Support:

● Via the Internet using the Support Request:

Support request (http://www.siemens.com/automation/support-request

● Via Phone:

– Europe: [phone]

– America: [phone]

– Asia-Pacific: [phone]

Further information about our technical support is available on the Internet at

Technical support (http://support.automation.siemens.com/WW/vi

Service & Support on the Internet

In addition to our documentation, we offer a comprehensive knowledge base online on the
Internet at:

Service & Support (http://www.siemens.com/automation/se

There you will find:

● The latest product information, FAQs, downloads, tips and tricks.

● Our newsletter, providing you with the latest information about your products.

● Our bulletin board, where users and specialists share their knowledge worldwide.

● You can find your local contact partner for Industry Automation and Drives Technologies in
our partner database.

)

ew/en/16604318

rvice&support)

)

● Information about field service, repairs, spare parts and lots more under "Services."

Additional Support

Please contact your local Siemens representative and offices if you have additional questions
about the device

Find your contact partner at:

Local contact person (http://www.siemens.com/automation/partner

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

)

37

Service and maintenance

7.4 Technical support

Milltronics MUS

38 Operating Instructions, 06/2012, 7ML19985CQ02-02

Technical data

8

8.1 Specifications

Accuracy

± 0.5% of totalization over 25 to 100% operating range

Accuracy subject to: On factory approved installations the belt scale systems totalized weight will be within the specified

accuracy when compared to a known weighed material test sample. The test rate must be within the specified range of
the design capacity and held constant for the duration of the test. The minimum material test sample must be equivalent
to a sample obtained at the test flow rate for three revolutions of the belt or at least ten minutes running time, whichever
is greater.

Load Cell

Construction Nickel plated alloy steel
Enclosure IP66 rated
Excitation 10 V DC nominal, 15 V DC maximum
Output 2 mV / V excitation at rated load cell capacity
Non-linearity 0.02% of rated output
Hysteresis 0.02% of rated output
Non-repeatability 0.01% of rated output
Capacity standard duty ranges: 20, 30, 50, 75, 100 kg

heavy duty ranges: 50, 100, 150, 200, 500 kg

Overload 150% of rated capacity

ultimate 200% of rated capacity

Temperature -40 to +65 °C (-40 to +150 °F) operating range

-10 to +40 °C (+15 to +105 °F) compensated

Belt width

standard duty: up to 1000 mm (CEMA width up to 42 ")
heavy duty: up to 1500 mm (CEMA width up to 60")
refer to Outline Dimensions

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

39

Technical data

8.1 Specifications

Belt speed

3 m/s (600 fpm)

Contact Siemens application engineering for consideration of higher belt speeds.

Capacity

up to 5000 t/h (5500 STPH) at maximum belt speed

Conveyor incline

Table 8- 1 Conveyor incline

± 20° from horizontal, fixed incline
up to ±30° with reduced accuracy Review by Siemens application engineer required.

Conveyor idler

flat to 35 °
up to 45 ° with reduced accuracy Review by Siemens application engineer required.

Idler diameter

50 to 180 mm (2 to 7 ")

Idler spacing

0.6 to 1.5 m (2.0 to 5.0 ft)

Interconnection (to integrator)

< 150 m (500 ft) 0.75 mm
> 150 m (500 ft) to 300 m (1000 ft) 0.75 to 0.34 mm2 (18 to 22 AWG) 8 conductor shielded cable

2 (

18 AWG) 6 conductor shielded cable

Milltronics MUS

40 Operating Instructions, 06/2012, 7ML19985CQ02-02

Technical data

8.1 Specifications

Approvals

Europe CE
Australia C-TICK

EMC performance available upon request.

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

41

Technical data

8.1 Specifications

Milltronics MUS

42 Operating Instructions, 06/2012, 7ML19985CQ02-02

Dimension drawings

9.1 Outline dimensions

Standard Duty - Side View

Standard Duty: 450 to 1000 mm (18 to 42")
maximum weight: 20 kg (44 lbs), 10 kg (22 lbs) per side



184
(7.25)

9





19
(0.75)

① 1/2" (M12) mounting bolts (customer supplied) ③ Calibration bar support (test weight)
② Shipping brackets ④ Weigh idler

MUS Belt Scale standard duty side view - dimensions in mm (inches)

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

Note

(2) approach and (2) retreat idlers should be aligned with the weight idler to within +0.8 to 0
mm (+1/32 to 0"). Contact your Siemens representative with any questions.

168
(6.63)

140
(5.50)

559
(22)



43

Dimension drawings

9.1 Outline dimensions

Standard Duty - Front View





122
(4.81)





① Shipping brackets
② Standard base CEMA idler, or equivalent (customer supplied)
③ Existing conveyor stringers
④ Belt width +230 mm (9", based on CEMA sizes), or to suit

MUS Belt Scale standard duty front view - dimensions in mm (inches)

76
(3.00)

Milltronics MUS

44 Operating Instructions, 06/2012, 7ML19985CQ02-02

Dimension drawings

9.1 Outline dimensions

Heavy Duty - Side View

Heavy Duty: 1200 to 2000 mm (48 to 84") although can be aligned to

narrow conveyors

maximum weight: 30 kg (64 lbs), 15 kg (32 lbs) per side







186
(7.32)

19
(0.75)

203
(8.00)

① 1/2" (M12) mounting bolts (customer

supplied)

② Shipping brackets ④ weigh idler

MUS Belt Scale heavy duty side view - dimensions in mm (inches)

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02

Note

(2) approach and (2) retreat idlers should be aligned with the weight idler to within +0.8 to 0
mm (+1/32 to 0"). Contact your Siemens representative with any questions.

159
(6.25)

616
(24.25)



③ Calibration bar support (test weight)

45

Dimension drawings

9.1 Outline dimensions

Heavy Duty - Front View





143
(5.62)





① Shipping brackets
② Standard base CEMA idler or equivalent (customer supplied)
③ Existing conveyor stringers
④ Belt width +230 mm (9", based on CEMA sizes), or to suit

MUS Belt Scale heavy duty front view - dimensions in mm (inches)

76
(3.00)

Milltronics MUS

46 Operating Instructions, 06/2012, 7ML19985CQ02-02

www.siemens.com/processautomation

For more information

www.siemens.com/level

www.siemens.com/weighing

Siemens AG
Industry Sector
1954 Technology Drive
P.O. Box 4225
Peterborough, ON
Canada K9J 7B1
email: [e-mail]

www.siemens.com/processautomation

Subject to change without prior notice
7ML19985CQ02 Rev. 2.3

© Siemens AG 2012

*7ml19985CQ02*

Printed in Canada