Siemens SITRANS WW300 User manual

Weighfeeders
Operating Instructions 03/2010
SITRANS WW300
SITRANS

© Siemens Milltronics Process Instruments Inc. 2010
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 Inc.
•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 Milltronics Process
Instruments Inc. 2010. 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 Inc. Siemens
Milltronics Process Instruments Inc. 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.
Please check the website shown below for the
latest manual revisions.
We welcome all suggestions for improvement.
Technical data subject to change.
MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments Inc.
Contact SMPI Technical Publications European Authorized Representative
at the following address:
Technical Publications Siemens AG
Siemens Milltronics Process Instruments Inc. Industry Sector
1954 Technology Drive, P.O. Box 4225 76181 Karlsruhe
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Email: [e-mail]
•For a selection of Siemens Milltronics level measurement manuals, go to:
www. siemens.com/level. Choose Instructions and Manuals under the More Info list.
•For a selection of Siemens Milltronics weighing manuals, go to:
www. siemens.com/weighing. Choose Support, and then Manuals / Operating Instructions.

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Table of Contents
SITRANS WW300 ................................................................................................................ 1
Safety notes ..............................................................................................................................................1
The manual ...............................................................................................................................................1
Technical Support ....................................................................................................................................2
Safety ..................................................................................................................................... 3
Safety and general precautions ..........................................................................................................3
Specifications ...................................................................................................................... 4
Operation .............................................................................................................................. 6
Weighfeeders ...........................................................................................................................................6
Mechanical installation .................................................................................................... 7
Installation ................................................................................................................................................7
Calibration ............................................................................................................................9
Test Load ...................................................................................................................................................9
Zero .............................................................................................................................................................9
Span ............................................................................................................................................................9
Wiring .................................................................................................................................. 10
Start Up ............................................................................................................................... 11
Shear Gate ..............................................................................................................................................11
Skirtboards ..............................................................................................................................................11
Changing the Conveyor Belt ...............................................................................................................11
Belt Tension ............................................................................................................................................12
Belt Tracking
(for self steering units the belt will track itself) ....................................................12
Telescoper Adjustment ........................................................................................................................13
Panel Removal ........................................................................................................................................14
Load Cell Replacement ........................................................................................................................14
Removing Old Dual Beam Load Cell .......................................................................................14
Installing New Dual Beam Load Cell ......................................................................................15
Removing Old Triple Beam Load Cell ...............................................................................................15
Installing New Triple Beam Load Cell ....................................................................................16
Calibration .....................................................................................................................................16
Weighing Idler Alignment ....................................................................................................................16
Quick Start Up Overview .....................................................................................................................17
Troubleshooting ................................................................................................................. 18
Mechanical Troubleshooting ..............................................................................................................18
Zero Drift, Non-Repeatability, or Non-Linearity ..................................................................18
Maintenance ...................................................................................................................... 19
Preventative Maintenance .................................................................................................................19

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Recommended Preventative Maintenance Schedule .................................................................19
General Maintenance ..........................................................................................................................19
Lubrication ..............................................................................................................................................20
Weighfeeder Storage Recommendations ......................................................................................20
Dimensions ........................................................................................................................21
Open Unit .......................................................................................................................................21
Enclosed Unit ................................................................................................................................22

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Introduction
SITRANS WW300
SITRANS WW300 is a medium-to-high capacity weighfeeder for macro ingredient
additives. It is designed for industrial applications such as mining, cement, chemical
processing, pulp and paper, and other heavy-duty industries.
SITRANS WW300 comes with weigh bridge, speed sensor, and test weights. An
integrator is required to complete the system.
Safety notes
Special attention must be paid to warnings and notes highlighted from the rest of the text
by grey boxes.
The manual
This instruction manual covers the operation, installation, and maintenance of
SITRANS WW300. Specific information for your Weighfeeder model is also included such
as: motor, reducer, testing documents, customer application data, spare parts.
Please refer to this manual for proper installation and operation of SITRANS WW300.
Adhering to the installation and operating procedures will ensure quick, trouble-free
installation and allow for maximum accuracy and reliability of your weighfeeder.
If you have any questions, comments, or suggestions about the manual contents, please
email us at techpubs.sm[email protected].
For the complete library of Siemens manuals,
go to www. siemens.com/weighing.
WARNING means that failure to observe the necessary precautions
can result in death, serious injury, and/or considerable material
damage.
Note: means important information about the product or that part of the operating
manual.
Notes:
• SITRANS WW300 is to be used only in the manner outlined in this instruction
manual.
• 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.

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Introduction
Technical Support
Support is available 24 hours a day.
To find your local Siemens Automation Office address, phone number and fax number go
to:
www.siemens.com/automation/partner
• Click on the tab Contacts by Product then find your product group (+Process
Automation > +Process Instrumentation > +Level Measuring Instruments).
• Select the team Technical Support. Click on Next.
• Click on the appropriate continent, then select the country followed by the city. Click
on Next.
For on-line technical support go to:
www.siemens.com/automation/support-request
• Enter the device name (SITRANS WW300) or order number, then click on Search,
and select the appropriate product type. Click on Next.
• You will be prompted to enter a keyword describing your issue. Then either browse
the relevant documentation, or click on Next to email a detailed description of your
issue to Siemens Technical Support staff.
Siemens A&D Technical Support Center: phone [phone]
fax [phone]

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Safety
Safety
Safety and general precautions
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
WARNINGS:
• Always follow safe practices when working on or around SITRANS WW300,
especially in wet environments and when adjacent to conductive steel
mounting framework.
• 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.
Note: A weighfeeder can be dangerous. Pinch points exist along the conveyor belt
line.

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Specifications
Specifications
Accuracy
• ± 0.5%1
Operating temperature
• -10 to +40 °C (+14 to +104 °F)
Materials
• mild steel with stainless steel [304 (1.4301) or 316 (1.4401)], abrasive resistant
contact parts optional
Load cells
• two corrosion resistant platform type with mechanical overload protection
• non-linearity: ± 0.03%
• non-repeatability: ± 0.02%
Speed sensor
• industrial duty, digital optical encoder, tail shaft mounted
Framework
• cantilevered painted mild steel structural frame for quick and easy belt
replacement
Pulleys
• 200 to 500 mm (8 to 20"), crowned with 6 mm (¼") rubber lagging on drive pulley for
maximum traction, 200 to 500 mm (8 to 20") crowned tail.
Idlers
• heavy-duty 100 mm (4") CEMA C with precision ground ball bearings and triple
labyrinth seals for longer life, CEMA D, E, impact where required
1. Accuracy subject to: On factory approved installations the weigh feeder system’s
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.

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Specifications
Belting
• black rubber, 150-440 PIW 2-4 ply vulcanised endless
• 'B' section (standard)
• up to 130 mm (5") corrugated sidewalls (optional)
Belt tension
• screw type, telescoper module with 150 mm (6") min. travel
• self steering tensioner (optional)
Belt cleaning
• gravity tensioned UHMW blade at head pulley
• return plow at tail pulley
Drive
• 0.19 kW (0.25 HP) min., TEFC, or TENV 208/230/380/460/575 V AC, three phase or
90/180 V DC permanent magnet - both with shaft mounted gear reducer
• larger/other motor sizes and voltages available
Shipping weight
• 410 kg (900 lbs) minimum
Approvals
• for use in hazardous rated areas, consult with factory

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Operation
Operation
Weighfeeders
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 strain gauge
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 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).
Enclosed Open

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Installation
Mechanical installation
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.
Your weighfeeder has been designed, assembled, and factory tested for your specific
application.
Installation
1. 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.
2. Securely fasten the unit to a rigid, level structure. Use a level for verification and
shim as necessary. Prevent any twisting of the frame that may affect weighfeeder
performance.
3. 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.
4. Check the gear reducer oil level. See the gear reducer manual for further details on
maintenance.
5. Flexible in-feed connections are REQUIRED for all applications. Flexible discharge
connections are also recommended. The unit is shipped with a gear reducer
breather; install the breather in the appropriate fill hole per the included reducer
manual.
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.
Notes:
• Refer to the mechanical drawings sent with this manual prior to commencing with
installation.
•DoNOT remove the tagged load cell shipping bolt(s) until the installation is
complete to prevent load cell damage.
•DoNOT 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.
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.
Note: Inlet and discharge will not support load.

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Installation
6. Connect the proper electric supply to the motor and/or motor controller, following
the interwiring diagram supplied with this manual. 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.
7. Remove only the TAGGED shipping bolt or bracket that is attached to the dual beam
load cell types only. This bolt supports the weighbridge during transport and
installation.
8. Before starting the machine, make a final check to see that the conveyor belt is free
of all tools and foreign objects.
Note: DO NOT loosen or tighten the overload bolt (on dual beam loadcells) — it has
been factory set to minimize the possibility of load cell damage resulting from
incidental overload.

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Calibration
Calibration
After SITRANS WW300 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. The calibration is initially done using the
supplied test load. Material tests are recommended to achieve maximum accuracy.
Test Load
The test load value for your SITRANS WW300 is given on the accompanying factory test
sheet, in kilograms per meter or pounds per foot.
Zero
Perform the zero calibration as described in the Calibration section of the integrator
manual.
Span
The test load used in the calibration procedure is a set of factory sized and supplied test
weights (2 or more).
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 load and store it.

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Wiring
Wiring

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Start Up
Start Up
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.
Start the belt again and observe the machine as it is running. If the belt is not tracking
correctly, see
Belt Tracking on page 12.
Shear Gate
The shear gate on the inlet of the weighfeeder needs to be set to allow the maximum
feedrate capacity for the application, hieght is provided in the outline drawings included.
Consult your Siemens representative if feed rate changes are required.
Skirtboards
The skirtboards have been factory set. Note that near the inlet, the skirtboards are very
close to the belt. However, the distance between the skirtboards is greater at the
discharge end: the skirtboards are 1/8 to 3/16" off the belt. This tapering improves material
flow and will help the product move down the belt without "bottlenecking."
Adjustments of the skirtboards should not be necessary but if they are required, set the
skirtboards at the heights described above.
Changing the Conveyor Belt
1. Open and remove the access and non-access side covers (omit this step on open
construction models).
2. Mark the position of the telescopers for reference. This will be handy when you re-
install the belt. Loosen the telescopers to remove tension from the belt.
WARNING: Turn off and lock out all power sources before
correcting rotation. On DC motors, reverse the armature wires. On
AC motors, reverse 2 of the 3 motor wires.
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.

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Start Up
3. At the discharge end of the conveyor, find the belt scraper weight tensioner. Remove
the weight(s) from the belt scraper arm and let the belt scraper swing down away
from the belt.
4. Remove support posts on the access site.
5. From the access side of the feeder at the discharge end, grab the edge of the belt on
the top and bottom. Gently pull the belt over the side rail, making sure that the
leading edge of the belt does not catch on the side rail.
6. Now repeat Steps 4 and 5 on the inlet end of the feeder. Again, be careful not to cut
or scrape the belt on the side rail.
7. When both ends have been pulled to the outside of the side rail, you may grab the
belt in the middle and slowly remove the belt. As the belt is removed, mark the
direction the belt was rotating. This mark will allow you to re-install the belt in the
same direction. Take care when storing the belt to prevent kinks or other damage.
8. With the belt removed, inspect the feeder for material build up, lodged particles, and
signs of wear, paying close attention to the weigh section. Take care when cleaning
the weigh section area, as 25 lbs. (or less) pressure placed on the weighbridge
could cause load cell damage.
9. Reverse steps 1-7 to re-install the same belt.
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 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" 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.
Belt Tracking (for self steering units the belt will track itself)
1. Before attempting to track the belt, be sure:
• belt scraper is in place
• belt tension is near guidelines suggested on page 12
• feeder is level and true
Note: Skirtboard removal or adjustment is not normally necessary to perform belt
removal or installation, nor is it recommended. On corrugated belts the skirtbaords
are designed to hang on a pivot, out of the way without full removal.
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 on page 12).

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Start Up
• frame is not warped or twisted
• head and tail pulley are parallel to each other
• plow is contacting underside
2. Turn on the feeder and observe its tracking line on the head and tail pulleys.
If the belt is drifting toward one side of the feeder, then adjust the telescoper on
either side of the machine (see below).
3. Do not adjust belt tracking rollers, they have been factory set.
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 adjustment (1
turn or less) is required.
4. Observe the results of the adjustment and then readjust, if necessary.
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 build-up on head or tail pulleys.
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.
driven shaft
jam nut
adjusting screw

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Start Up
Panel Removal
Using a hex key, turn the panel mounts 90 degrees per the label attached to the panel
around the mount to release, inspect the gasketing to ensure it creates a positive seal
against the body of the enclosure.
Load Cell Replacement
If a load cell on SITRANS WW300 has been damaged, is not functioning, or if you are
changing the capacity, you will need to replace one or all load cells.
Removing Old Dual Beam Load Cell
1. Confirm the new replacement load cell is correct and functional. Using a digital volt
meter or ohm meter, verify that the resistance of the new load cell matches the
resistance printed on the specification sheet that comes with the load cell. If the
resistances do not match, the load cell may be damaged. Consult your Siemens
representative.
2. Disconnect the load cell being replaced from the junction box. Verify that the load
cell is connected according to the interwiring diagram supplied with this manual.
Disconnect the load cell from the load cell junction box. Free the load cell cable from
the feeder so it is hanging free from the load cell.
3. Install the shipping screw (tagged) through the bottom load cell mount and into the
load cell. Tighten the shipping screw until the load cell bottoms out on the overload
screw.
4. Support the scale idler and remove the two top load cell mount bolts. Be careful not
to move the idler as it is still attached to the load cell on the other side of the
weighfeeder.
5. Remove the two bottom load cell mount bolts. The load cell is now held in place only
by the shipping bolt.
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.
Note: Please read and understand all of the instructions before proceeding with the
replacement. Contact your Siemens representative for assistance.
load cell
bottom load cell mount shipping
screw
overload
screw

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Start Up
6. Support the scale idler with a block of wood or have an assistant hold it. Remove the
shipping screw and slide the load cell off the feeder.
Installing New Dual Beam Load Cell
1. Slide the new load cell into position and carefully screw in the load cell shipping
screw. Do not overtighten the screw.
2. Install the two bottom load cell mount bolts. Tighten them by hand. Now re-tighten
the shipping bolt so the load cell is resting against the overload stop.
3. Install the two top load cell mount bolts. Tighten them by hand.
4. Start with the bottom load cell mounting bolts and tighten them. Now tighten the
two top load cell mounting bolts to the value provided with the loadcell replacement.
5. Remove the shipping screw.
6. Route the load cell cable to the junction box and connect the load cell according to
the supplied interwiring diagram. Repeat for other load cells if necessary.
7. Perform a load cell balancing procedure as described in the integrator instruction
manual.
Removing Old Triple Beam Load Cell
1. Confirm the new replacement load cell is correct and functional. Using a digital volt
meter or ohm meter, verify that the resistance of the new load cell matches the
resistance printed on the specification sheet that comes with the load cell. If the
resistances do not match, the load cell may be damaged. Consult your Siemens
representative.
2. Disconnect the load cell being replaced from the junction box. Verify that the load
cell is connected according to the interwiring diagram supplied with this manual.
Free the load cell cable from the feeder so it is hanging free from the load cell.
3. Support the scale idler and remove the two front load cell mount bolts. Be careful
not to move the idler as it is still attached to the load cell on the other side of the
weighfeeder.
4. Remove the two bottom load cell mount bolts.
5. Support the scale deck with a block of wood or have an assistant hold it and slide
the load cell off the feeder.
bottom load cell mount
load cell

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Start Up
Installing New Triple Beam Load Cell
1. Slide the new load cell into position.
2. Install the two front load cell mount bolts. Tighten them by hand.
3. Start with the bottom load cell mounting bolts and tighten them to 200 in-lb torque.
Now tighten the two front load cell mounting bolts to 200 in-lb torque.
4. Route the load cell cable to the junction box and connect the load cell accordingto
the supplied interwiring diagram. Repeat for other load cells if necessary.
5. Perform a load cell balancing procedure as described in the integrator instruction
manual.
Calibration
1. Power up the integrator and using the appropriate integrator menu, verify that the
new load cell(s) are operating correctly.
2. Zero calibrate the unit using the integrator manual for reference. Record zero
calibration procedure results.
3. Span calibrate the unit using the integrator manual for reference. Record span
calibration procedure results.
4. Run another zero calibration and record the results. Verify that the repeated zero
shows the same value as recorded in step 2.
5. Confirm calibration with material test as described in the integrator manual, if
possible, before placing the feeder back in operation.
Weighing Idler Alignment
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. Verify that the weighing
idler is aligned properly. Use a spirit level to level the load cells.
Belt Direction
Run string to ensure idler alignment on both
sides to ±1/32" (0.8 mm).
Secure bolts with idlers aligned and
load cells level. Align both sides and
secure load cells in unison.
Use spirit level to level load
cell, on each side.