Siemens Milltronics MUS User manual

Milltronics
Belt Scales
Milltronics MUS Belt Scale
Operating Instructions 06/2012

© Siemens AG 2012
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.
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.
MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments.
Contact SMPI Technical Publications European Authorized Representative
at the following address:
Technical Publications Siemens AG
SiemensAG IndustrySector
Siemens Milltronics Process Instruments 76181 Karlsruhe
1954 Technology Drive, P.O. Box 4225 Deutschland
Peterborough, Ontario, Canada, K9J 7B1
Email: [email protected]
For a selection of Siemens Milltronics level measurement manuals, go to:
www. siemens.com/processautomation. Under Process Instrumentation, select
Level Measurement and then go to the manual
archive listed under the product family.
For a selection of Siemens Milltronics weighing manuals, go to:
www. siemens.com/processautomation. Under Weighing Technology, select
Continuous Weighing Systems and then go to the
manual archive listed under the product family.

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Milltronics
Belt Scales
Milltronics MUS
Operating Instructions
06/2012
7ML19985CQ02-02
Introduction
1
Safety notes
2
Description
3
Installing/mounting
4
Connecting
5
Commissioning
6
Service and maintenance
7
Technical data
8
Dimension drawings
9

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

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02 3
Table of contents
1 Introduction................................................................................................................................................ 5
1.1 The manual ....................................................................................................................................5
2 Safety notes............................................................................................................................................... 7
2.1 General safety instructions ............................................................................................................7
3 Description................................................................................................................................................. 9
3.1 Introduction ....................................................................................................................................9
3.2 Principle of operation .....................................................................................................................9
4 Installing/mounting................................................................................................................................... 11
4.1 Introduction ..................................................................................................................................11
4.2 Conveyor Considerations.............................................................................................................11
4.2.1 Control gates................................................................................................................................12
4.2.2 Conveyor belting ..........................................................................................................................12
4.2.3 Head pulley ..................................................................................................................................12
4.2.4 Conveyor curvature......................................................................................................................15
4.2.5 Belt ploughs .................................................................................................................................16
4.2.6 Stacker conveyors .......................................................................................................................16
4.2.7 Conveyor trippers.........................................................................................................................16
4.2.8 Skirt boards and sealing strips.....................................................................................................17
4.3 Load cell handling ........................................................................................................................17
4.4 Installation precautions ................................................................................................................18
4.5 Installation Procedure ..................................................................................................................19
4.5.1 Installation introduction ................................................................................................................19
4.5.2 Remove the idler..........................................................................................................................19
4.5.3 Remove the idler foot plate and modify the idler frame at both ends ..........................................20
4.5.4 Idler mounting ..............................................................................................................................20
4.5.5 Position the weighmodule............................................................................................................24
4.5.6 Position the scale.........................................................................................................................25
4.5.7 Release the shipping stops..........................................................................................................26
4.5.8 Align and level the idlers..............................................................................................................27
4.5.9 Check alignment ..........................................................................................................................28
5 Connecting .............................................................................................................................................. 29
5.1 Belt scale wiring ...........................................................................................................................29

Table of contents
Milltronics MUS
4 Operating Instructions, 06/2012, 7ML19985CQ02-02
6 Commissioning ........................................................................................................................................ 31
6.1 Calibration ................................................................................................................................... 31
6.2 Test load...................................................................................................................................... 31
6.3 Balancing..................................................................................................................................... 32
6.4 Final calibration ........................................................................................................................... 32
6.5 Zero calibration ........................................................................................................................... 33
6.6 Span calibration .......................................................................................................................... 33
6.7 Material test................................................................................................................................. 33
6.8 Re-rating...................................................................................................................................... 33
7 Service and maintenance ........................................................................................................................ 35
7.1 Maintenance................................................................................................................................ 35
7.2 Replacing a load cell................................................................................................................... 36
7.3 Spare parts.................................................................................................................................. 36
7.4 Technical support........................................................................................................................ 37
8 Technical data ......................................................................................................................................... 39
8.1 Specifications .............................................................................................................................. 39
9 Dimension drawings ................................................................................................................................ 43
9.1 Outline dimensions...................................................................................................................... 43

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02 5
Introduction 1
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.
1.1 The manual
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:
Technical publications (mailto:[email protected])

Introduction
1.1 The manual
Milltronics MUS
6 Operating Instructions, 06/2012, 7ML19985CQ02-02

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02 7
Safety notes 2
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.

Safety notes
2.1 General safety instructions
Milltronics MUS
8 Operating Instructions, 06/2012, 7ML19985CQ02-02

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02 9
Description 3
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.
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.

Description
3.2 Principle of operation
Milltronics MUS
10 Operating Instructions, 06/2012, 7ML19985CQ02-02

Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02 11
Installing/mounting 4
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.
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.

Installing/mounting
4.2 Conveyor Considerations
Milltronics MUS
12 Operating Instructions, 06/2012, 7ML19985CQ02-02
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.

Installing/mounting
4.2 Conveyor Considerations
Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02 13
● 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.

Installing/mounting
4.2 Conveyor Considerations
Milltronics MUS
14 Operating Instructions, 06/2012, 7ML19985CQ02-02






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

Installing/mounting
4.2 Conveyor Considerations
Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02 15
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.
Note
Avoid locating the scale within the tangents of scale curvature.
Concave




① Minimum 12 m (40 ft)
② Tangents
③ Belt scale
Convex



① Minimum 6 m (20 ft)
② Minimum 12 m (40 ft)
③ Tangents
④ Belt scale

Installing/mounting
4.2 Conveyor Considerations
Milltronics MUS
16 Operating Instructions, 06/2012, 7ML19985CQ02-02
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.

Installing/mounting
4.3 Load cell handling
Milltronics MUS
Operating Instructions, 06/2012, 7ML19985CQ02-02 17
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.

Installing/mounting
4.4 Installation precautions
Milltronics MUS
18 Operating Instructions, 06/2012, 7ML19985CQ02-02
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.