Siemens 7MH7300 Series User manual

SITRANS
Weighfeeders
SITRANS WW200
Operating Instructions
7MH7300-....(SITRANS WW200)
06/2018
A5E33560654-AC
Introduction 1
Safety information 2
Description 3
Installing 4
Calibrating 5
Connecting 6
Commissioning 7
Maintenance 8
Troubleshooting 9
Technical data 10
Dimension drawings 11

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
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
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
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E33560654
Ⓟ 04/2019 Subject to change
Copyright © Siemens AG 2015.
All rights reserved

Table of contents
1 Introduction...................................................................................................................................................5
1.1 The manual ..............................................................................................................................5
2 Safety information.........................................................................................................................................7
2.1 Safety and general precautions ...............................................................................................7
3 Description....................................................................................................................................................9
3.1 Weighfeeder operation.............................................................................................................9
3.2 WW200 Operation..................................................................................................................10
4 Installing .....................................................................................................................................................11
4.1 Installation steps ....................................................................................................................11
5 Calibrating ..................................................................................................................................................13
5.1 Test load ................................................................................................................................13
5.2 Zero........................................................................................................................................13
5.3 Span.......................................................................................................................................13
6 Connecting .................................................................................................................................................15
6.1 Integrator Wiring Note ............................................................................................................15
7 Commissioning ...........................................................................................................................................17
7.1 Shear gate..............................................................................................................................17
7.2 Skirtboards .............................................................................................................................17
7.3 Changing the conveyor belt ...................................................................................................18
7.4 Belt tension ............................................................................................................................19
7.5 Belt tracking ...........................................................................................................................19
7.6 Telescoper adjustment...........................................................................................................20
7.7 Weigh deck alignment............................................................................................................21
7.8 Quick startup overview...........................................................................................................22
7.9 Load cell replacement ............................................................................................................22
7.9.1 Removing old load cell ...........................................................................................................22
7.9.2 Installing new load cell ...........................................................................................................23
7.9.3 Recalibration ..........................................................................................................................24
8 Maintenance ...............................................................................................................................................25
8.1 Preventative maintenance......................................................................................................25
8.1.1 Recommended preventative maintenance schedule .............................................................25
8.2 General maintenance.............................................................................................................26
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8.3 Lubrication..............................................................................................................................26
8.4 Weighfeeder storage recommendations ................................................................................26
8.4.1 Load cell care.........................................................................................................................26
8.4.2 Gear reducer ..........................................................................................................................26
8.4.3 Electrical.................................................................................................................................27
8.4.4 Lubrication..............................................................................................................................27
8.4.5 Belt care .................................................................................................................................27
9 Troubleshooting..........................................................................................................................................29
9.1 Mechanical troubleshooting ...................................................................................................29
9.1.1 Zero Drift, non-repeatability, or non-linearity..........................................................................29
10 Technical data ............................................................................................................................................31
10.1 Specifications .........................................................................................................................31
11 Dimension drawings ...................................................................................................................................33
11.1 Open unit................................................................................................................................33
11.2 Enclosed unit..........................................................................................................................34
Index...........................................................................................................................................................35
Table of contents
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Introduction 1
Note
The Siemens weighfeeder is to be used only in the manner outlined in this instruction manual.
1.1 The manual
This instruction manual covers the operation, installation, and maintenance of the Siemens
weighfeeder. Specific information for your weighfeeder model is also included with the product
such as testing documents.
Follow these operating instructions for quick, trouble-free installation, and maximum accuracy
and reliability of your device.
We always welcome suggestions and comments about manual content, design, and
accessibility. Please direct your comments to:
Technical publications (mailto:[email protected])
For the complete library of Siemens manuals, go to:
Process Automation portal (http://www.siemens.com/processautomation)
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Introduction
1.1 The manual
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Safety information 2
2.1 Safety and general precautions
WARNING
ALWAYS STOP the belt, lock-out, and/or place a "Do Not Energize" tag on the main
disconnect before working on or around the weighfeeder.
WARNING
Always follow established safe operating practices when working on or around the
weighfeeder, especially in wet environments and when adjacent to conductive steel mounting
framework.
Note
A weighfeeder can be dangerous. Pinch points exist along the conveyor belt line.
Secure the weighfeeder when:
• replacing the belt
• working on or around the load cell(s)
• working on or around the speed sensor
• working on or around the drive components
• working on or around the motor
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Safety information
2.1 Safety and general precautions
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Description 3
SITRANS WW200 is a low-to-medium capacity weighfeeder for minor ingredient additives.
The unique weigh system applies live load directly to two platform load cells. An adjustable
mechanical shear gate profiles the material and fixes the correct material bed depth for a given
material application. The belt speed can be automatically adjusted to attain the correct feed
rate.
SITRANS WW200 comes with a weigh bridge, and speed sensor. An integrator and test
weights are required to complete the system.
3.1 Weighfeeder operation
Weighfeeders weigh bulk material while it is conveyed. An accurate rate of flow and totalized
weight measurement is received without interrupting the flow of material in process. A
weighfeeder can also control the rate of flow of the conveyed product.
In-motion weighing requires accurate transmission of the product load to load cells. The
resulting voltage signal corresponding to weight is transmitted to the integrator and becomes
one of the two inputs required for integration.
Unlike static weighing, in-motion weighing integration requires a second input: a pulse signal
proportional to the speed of the conveyor belt. Each belt speed sensor pulse represents a fixed
distance of belt travel.
Since the force measured by the load cell is represented as weight per unit length, it can be
multiplied by the distance of belt travel (one speed sensor pulse) to provide product weight for
that segment of the belt (lbs/ft x ft = lbs, or kg/m x m = kg).
Adding the samples provides total throughput weight of product across the scale. With proper
scaling and calibration, the total weight can be displayed in kilograms, pounds, short tons, long
tons, metric tons, or other appropriate units.
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3.2 WW200 Operation
Enclosed unit
Open unit
Description
3.2 WW200 Operation
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Installing 4
Note
When lifting the weighfeeder, connect to the structural frame, and follow local governing code
for lifting/hoisting.
Perform a thorough and systematic inspection of containers immediately upon receipt of your
Siemens weighfeeder. The containers are packed to separate each item and provide protection
during shipping.
Note
Do not remove equipment from shipping crates or boxes until you check for possible shipping
damage. Contact the carrier immediately if damage is noted.
Your weighfeeder has been designed, assembled, and factory tested for your specific
application.
Note
● The frame of the weighfeeder needs to be grounded to ensure accurate signal processing
to the integrator.
● Do NOT remove the tagged load cell shipping bolt(s) until the installation is complete to
prevent load cell damage.
● Do NOT weld on or near the weighfeeder while the load cell is connected to the electronic
integrator. Damage to the integrator may result if the load cell is not disconnected from the
integrator.
● Follow a scheduled, preventative maintenance program to ensure optimum performance
and long equipment life.
4.1 Installation steps
Note
● Only qualified personnel are authorized to install and operate this equipment. Installation
shall be in accordance with local regulations, standards and established safety practices.
Read and understand the instructions before installing, operating or maintaining the
equipment.
● Flexible in-feed connections are REQUIRED for all applications. Flexible discharge
connections are also recommended.
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1. Construct the necessary support framework to provide a sturdy, rigid base. Vibration
isolators are recommended if the location is subject to moderate or heavy vibration.
2. Align the in-feed section of the weighfeeder with the discharge of the feed device. Prevent
twisting or misalignment that could induce stress on the weighing section.
3. Install a gasket between the flanges for dust control.
4. Securely fasten the unit to the rigid, level structure constructed in step 1. Use a level for
verification and shim as necessary. Prevent any twisting of the frame that may affect
weighfeeder performance.
Note
The inlet and discharge of the weighfeeder will not support load.
5. Note
If your system has a permanently lubricated gear motor, then disregard this step, and
proceed directly to step 6.
Check the gear reducer oil level. For further details, see the gear reducer information
under Maintenance.
6. A de-dust port may be provided at the discharge end of enclosed units. If no de-dust system
is required, this port should be closed.
7. Connect the proper electric supply to the motor and/or motor controller. The AC or DC motor
controller (if present) must be grounded to minimize noise to the electronic integrator. Refer
to the applicable wiring diagram to make all electrical connections between the electronic
integrator and the weighfeeder.
Note
Units with a plugged discharge switch should refer to the wiring diagram included in the
CLS100 manual.
8. Remove only the tagged shipping bolt that is attached to the load cell. This bolt supports the
weighbridge during transport and installation.
Note
DO NOT loosen or tighten the overload bolt—it has been factory set to minimize the
possibility of load cell damage resulting from incidental overload.
9. Before starting the weighfeeder, make a final check to see that the conveyor belt is free of
all tools and foreign objects, and that the infeed/skirtboards are not pinching against the belt.
Installing
4.1 Installation steps
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Calibrating 5
After the weighfeeder has been properly installed, calibration of the weighing system must be
done in conjunction with the integrator. Refer to the integrator instruction manual for
programming and calibration.
A test sheet has been provided with the weighfeeder detailing the entries used during factory
calibration.
The calibration is initially done using the supplied test load data in the factory test sheets.
Material tests are recommended to achieve maximum accuracy.
5.1 Test load
The test load value for the weighfeeder is given on the accompanying test sheet. To calculate
the test load or to change it, refer to the integrator instruction manual.
5.2 Zero
Perform the zero calibration as described in the Calibration section of the integrator manual.
Note
This calibration should be at least three belt revolutions or five minutes, whichever is longer.
5.3 Span
The test load used in the calibration procedure is based on a set of factory sized test weights
(2 or more). The weights ordered will not match this value exactly and the test load will need to
be adjusted during initial calibration.
Perform the span calibration as described in the Calibration section of the integrator instruction
manual.
After the span calibration has been completed, remove the test weights and store them.
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Calibrating
5.3 Span
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Connecting 6
LOAD CELL
"A"
LOAD CELL
"B"
TO
INTEGRATOR
TO
INTEGRATOR
SPEED SENSOR
1
111
1
1
1 1
2
222
TB1
TB4
TB3
TB5
TB7
TB2
+ EXC
+ EXC
EXC -
+ EXC
- EXC
- EXC
CH/B
COM
+ SIG A + SIG B
+ SIG A
+ SIG B
EXC + CH A
SIG CW
- SIG A
- SIG B
- SIG A
- SIG B
CH B CH/A
SIG CCW
SHIELDSHIELD
SHIELD SHIELD
TB6
TB8
2
2
2 2
3
333
3
3
3 3
4
444
4
4
4 4
5
555
5
5
5 5
6
66
6
6
7
77
7
7
6.1 Integrator Wiring Note
Note
For integrator wiring:
Wiring diagram shows connection to BW500 or BW500L. For connection to SIWAREX FTC,
WP241 or WT241 loadcell signals need to be wired in parallel: connect TB4.1 to TB2.5 and
TB4.2 to TB2.6.
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Note
Load cell sense lines
When sense lines (SEN + and SEN -) are included with a load cell, they must be terminated with
EXC (+ to +, - to -) or cut and covered, but not wrapped together as this will short the cell.
Note
Standard wiring shown, consult wiring diagrams for optional electrical connections. On
hazardous rated versions the termination box may appear different than shown.
Connecting
6.1 Integrator Wiring Note
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Commissioning 7
Your weighfeeder has been factory run-in for a minimum of four hours; it should require little
adjustment. However, periodic inspections of the belt tracking are recommended.
Start the belt and observe rotation.
WARNING
Turn off and lock out all power sources before correcting rotation. On AC motors, reverse 2 of
the 3 motor wires.
Start the belt again, and observe the machine as it is running. If the belt is not tracking correctly,
or is travelling off center, see Belt tracking (Page 19).
7.1 Shear gate
Note
Disregard for horseshoe-style infeeds.
The shear gate on the inlet of the weighfeeder needs to be set to allow the maximum feed rate
capacity required. Consult your Siemens representative if feed rate changes are required.
7.2 Skirtboards
The skirtboards have been factory set to proper specifications. Note that near the inlet, the
skirtboards are very close to the belt. However, toward the discharge end of the weighfeeder,
the skirtboards are 3 to 5 mm (1/8 to 3/16") higher off the belt. This relieving effect minimizes
the possibility of material becoming lodged between the skirtboard and the belt.
Periodic adjustments of the skirtboards should not be necessary but if adjustment is required,
set the skirtboards at the heights described above.
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Your system has been supplied with soft PVC seal strips. Position the seal strips on the belt as
shown.
1
2
34
5
①Pulley ④Do not force seal strip against belt
②Seal strip ⑤Belt
③Skirtboard
Note
Skirtboard seal stripping is not FDA or USDA approved material, and should be removed for
critical food applications.
7.3 Changing the conveyor belt
WARNING
ALWAYS STOP the belt, lock-out, and/or place a "Do Not Energize" tag on the main
disconnect before working on or around the weighfeeder.
Depending on the size of the weighfeeder, several personnel may be required to remove and
re-install the belt.
1. On enclosed models, open and remove the access and non-access side panels.
2. Mark the current position of the telescoper for reference. This will be a reference when you
re-install the belt. Loosen the telescopers to remove tension from the belt.
3. Remove support posts on the belt change side, and the belt side roller below the belt plow.
Remove tension from the belt scraper, and remove all other components for belt changing.
Note
Skirtboard removal or adjustment is not normally necessary to perform belt removal or
installation, nor is it recommended. However, if the belt has a corrugated sidewall this will be
required.
Commissioning
7.3 Changing the conveyor belt
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4. From the access side of the weighfeeder at the discharge end, grab the edge of the belt and
gently pull it over the side rail, making sure that the leading edge of the belt does not catch
on any components.
5. Repeat the previous step on the inlet end of the weighfeeder. Again, be careful not to cut or
scrape the belt on any components.
6. When both ends have been pulled to the outside of the side rail, grab the belt in the middle
and slowly remove it. As you are removing the belt, mark the direction the belt was rotating,
as this will allow you to re-install it in the same direction. Take care when storing the belt to
prevent kinks or other damage.
7. With the belt removed, inspect the weighfeeder for material buildup, lodged particles, and
signs of wear, paying close attention to the weighing section. Take care when cleaning the
weighing section, as 6 kg (15 lbs) (or less) pressure placed on the weighbridge could cause
load cell damage.
8. Reverse steps to re-install the same belt.
Note
● On a new replacement belt, there may be an arrow printed on the underside of the belt. This
arrow indicates what direction the belt should rotate when it is installed. If there is no arrow,
rotation of the belt may be in either direction. Whenever a new belt is installed, perform the
belt tracking procedure (see Belt tracking (Page 19)).
● New belts should be un-rolled and allowed to relieve any kinks or bends: this will help
tracking and weighing accuracy.
7.4 Belt tension
The ideal belt tension for any weighfeeder is just enough tension to prevent the belt from
slipping on the drive pulley. The tension minimizes the effect of the belt on weighing accuracy.
Often, the sole cause of an inaccurate weighfeeder is excessive belt tension.
Specific belt tension cannot be given because the weighfeeder could be mounted in various
applications. As a general guideline, the bottom of the belt should droop 1-2 inches (25-51 mm)
over the length of the weighfeeder. This is only an approximate specification, as your
application may require more or less tension due to varying belt loading and other operating
characteristics.
7.5 Belt tracking
Before attempting to track the belt, be sure:
• belt scraper is in place
• belt tension is near guidelines suggested in Belt tension (Page 19).
• weighfeeder is level and true
• installation has not warped or twisted the frame
Commissioning
7.5 Belt tracking
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• head and tail pulley are square to the frame and parallel to each other
• plow is contacting underside of the belt, belt is engaged with guide rollers.
Note
● Do not adjust belt tracking rollers, they have been factory set.
● Belt plow blades are adjustable vertically for proper contact to the belt.
Turn on the weighfeeder and observe its tracking line on the head and tail pulleys. If the belt is
drifting toward one side of the weighfeeder, then adjust the telescoper on either side of the
machine (see Telescoper adjustment (Page 20)).
7.6 Telescoper adjustment
1. Determine which side of the weighfeeder you want to adjust. Compressing the telescoper
on one side will cause the belt to drift toward that side of the weighfeeder. Conversely,
extending the telescoper will cause the belt to drift away from that side of the weighfeeder.
2. Loosen the jam nut.
3. Turn the adjusting screw in the desired direction. Often, only a small amount of adjustment
(1 turn or less) will be required.
4. Observe the results of the adjustment and then readjust, if necessary.
Steps 2 and 3 may need to be repeated to obtain perfect belt tracking.
Note
As you extend or compress the telescoper, you may be changing the belt tension. If belt
tension has increased (or decreased) considerably while attempting to track the belt, then
compress (or extend) both telescopers and complete the belt tracking process again. To
avoid this problem, extend one telescoper while compressing the other to obtain proper belt
tracking.
5. Re-tighten the jam nut located on the telescoper to maintain the new telescoper position
after completing the tracking procedure.
6. If you are having problems tracking the belt, consult your Siemens representative. Common
causes of belt tracking problems are: uneven or improperly distributed product loading,
twisted frame, or product buildup on head or tail pulleys.
Commissioning
7.6 Telescoper adjustment
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