VIBRATORY PARTS FEEDER USER MANUAL EURO SERIES
Contents
1. 630 1 3 Setting up Procedure CAUTION Do not connect the vibratory parts feeder directly to the mains supply Connect the electrical supply to the control box see control box instructions Plug the vibratory parts feeder into the control box Turn the control box on Rotate the control knob until the feed rate is satisfactory but no further than necessary as excessive vibration may actually decrease output and cause unnecessary wear and waste of power SAFETY WARNING Do not attempt to start the machine unless you understand what A you are doing and you have taken all the safety precautions normally required for industrial electronic control systems and machines Read thoroughly any manuals included with this machine for equipment with which you are unfamiliar VIBRATORY PARTS FEEDER EURO SERIES NOTE This machine is to be used only with the product for which it was supplied It is recommended that the vibratory parts feeder should be mounted on one of the specially developed stands which provides a safe mounting base for the parts feeder If one of these stands is used it MUST be securely bolted to a foundation before the parts feeder is attached If an alternative stand is to be used it must be of a stable and rigid construction so that it prevents the transmission of vibration produced by the parts feeder The vibratory parts feeder is usually equipped with a base plate that can be secured to a suitable work surface2. VIBRATORY PARTS FEEDER USER MANUAL EURO SERIES Manual No 238001 Rev 09 00 A AYLESBURY AUTOMATION VIBRATORY PARTS FEEDER EURO SERIES INTRODUCTION Please read this manual carefully before using your Vibratory Parts Feeder This manual contains information that will assist you with all aspects of safe unpacking installation and maintenance to ensure machine longevity WARNING Umax dial on all control boxes has been factory set to maximum coil A voltage for multi voltage coils Any adjustment of this setting could result in damage to the coil and control box due to overheating This manual illustrates all options that are available in the Euro Series V P F range i e 51 150 200 250 400 625 and 630 not all of these will be on your machine Before reading this manual please check that the following have been supplied e Drive unit e Bowl e Spare springs and shims untooled equipment only Aylesbury Automation makes every effort to ensure that this manual is reviewed whenever any significant changes are made to the design However our policy of continuous product improvement may result in some small differences between the unit supplied and the description in this document Risk assessments for these products are available on request For general enquiries regarding your machine contact the Service Department on Tel 44 0 1296 314300 Fax 44 0 1296 421625 For spare parts enquiries contact the A
3. beyond the greatest diameter of the bowl e Support brackets for the tracking and tracks should be fitted to the base plate or stand and NEVER to the vibratory system as such additions will create malfunctions with feeding and may damage the power unit and decrease the feed rate e ALWAYS maintain a gap of approximately 1 5mm between the bowl discharge and the track contact between these when the parts feeder is running MUST be avoided VIBRATORY PARTS FEEDER EURO SERIES 9 0 TROUBLESHOOTING Below is a guide to help solve some of the problems that might occur during the life of the machine If after following all the instructions carefully you still have a problem then do not hesitate to telephone our Service Department for assistance SAFETY WARNING Parts feeder not running After a period of time the system is not giving the required output Parts feeder develops loud noise Feeder characteristics change Erratic feeding and dead spots Possible Cause Remedy Check electrical supply to control box Check connections from control box to feeder Fuse in control box failed change fuse Screws on spring stacks loose tighten to the correct value see 5 0 TORQUE SETTINGS Fixing screws for the bowl loose tighten Coil gap or gaps incorrect adjust see 3 1 Adjustment of Coil to Armature Clearance Springs broken replace see 4 0 SPRING REPLACEMENT Bo
4. 630 1 half wave The coil should which is 2 0mm is indicated on the side of the coil Slacken 2 off M6 x 35 socket capscrews retaining armature Place 1 0mm 2 0mm for 400 1 and 630 1 half wave feeler gauge at each end of the armature Tighten 2 off M6 x 35 socket capscrews retaining armature Refit cover Switch power supply on Unit is now ready for operation Remove the cover Slacken 4 off M12 nuts retaining the coil above coil plate Raise each corner of the coil 1 4 turn in sequence until the coil and armature resonate Lower each corner of the coil 1 4 turn in sequence if necessary until the resonance stops Refit cover Unit is now ready for operation The unit may be laid on its side but not completely inverted 00 OY OF remain fixed with the adjustments being made to the armature only VIBRATORY PARTS FEEDER EURO SERIES 3 2 Replacing the Voltage Plug The coil fitted to your vibratory parts feeder is an epoxy encapsulated multi voltage unit and can be adapted to different voltages and or frequencies by following the procedure below MODEL 200 250 400 630 PROCEDURE Isolate power supply Remove cover Remove 2 off M2 5 x 6 cross head screws retaining the voltage plug Remove the voltage plug It may be possible that some resistance is met when attempting to remove the voltage plug In this event use a suitable tool to grip the plug but not with bare jaws or using excessive for
5. it is clear of components Clean the vibratory parts feeder thoroughly Disconnect the main power supply unit Lightly oil all non painted surfaces PON gt DRIVE UNIT MODEL NUMBER A251005 A290235 A290234 Spring 1 0mm Thick Spring 1 5mm Thick Spring 2 0mm Thick A290272 A290273 A290420 16 A290651 A203263 203262 801167 801709 5 16 Socket Capscrew A801690 M6 x 10 Socket Capscrew M6 x 20 Socket Capscrew A801725 8 x 20 C sunk Socket Screw M10 x 20 C sunk Socket Screw M10 x 25 C sunk Socket Screw M12 x 40 Hex Head Screw 801700 A801718 M5 x 26 Spring Pin A801238 M12 x 150 Stud Note Solid centre bowls for Models 250 400 and 630 require a centre plug part no A290670 X Model 400 630 coils supplied as 200v 50Hz Y wave A803086 or full wave A803082 3 Springs for Model 51400 400 1 2 0mm thick A290420 2 5mm thick A290651 400 2 2 0mm thick A290272 2 5mm thick A290273 R Centre spindles for Model SI630 Solid centre bowls A290685 Open centre bowls A290689 A200879 A258001 A803099 A803097 A803098 A803098 N A257031 A803084 A803081 A257030 HX A803176 A803176 A803175 A803175 A803174 A803174 A803173 A803173 A201359 A801186 A801709 Item No Description 1150 1200 1250 1400 S1625 51630 A290023 A2
6. spacers Remove top plate complete with spring banks and bowl if fitted Remove all cable ties and remove terminal block cover and slacken off 3 terminals live neutral and earth 400 oe 2 off M6 x 45 socket capscrews retaining faulty coil and trace cable back to terminal oc To replace coil repeat steps 3 5 in reverse order Tighten 3 off M12 x 60 socket capscrews retaining top plate to required settings see 5 0 TORQUE SETTINGS 8 Set coil to armature air gap see 3 1 Adjustment of Coil to Armature Clearance 9 Refit cover 10 Switch power supply on 11 Unit is now ready for operation 1 Isolate power supply 2 Remove cover 3 Remove bowl 4 Remove 6 off upper M12 x 60 socket capscrews retaining spring banks to bowl plate Remove bowl plate Note this must be performed by 2 people Remove 4 off M12 full nuts retaining coil to studding 625 Disconnect coil cable from terminal block and lift coil clear of studding To replace coil repeat steps 3 6 in reverse order Tighten 6 off M12 x 60 socket capscrews retaining bowl plate to required settings see 5 0 TORQUE SETTINGS Set coil to armature air gap see 3 1 Adjustment of Coil to Armature Clearance Refit cover Switch power supply on Unit is now ready for operation Isolate power supply Remove cover Remove 4 off lower M12 x 60 socket capscrews retaining spring banks to base casting but do not extract completely from spring bank as this retains spring spacers
7. using the holes provided If there is no base plate supplied with the machine the parts feeder must be secured using the threaded holes on the underside of the mounting feet SI 150 200 250 and 400 3 mounting feet SI 625 and 630 4 mounting feet VIBRATORY PARTS FEEDER EURO SERIES 2 0 TUNING THE UNIT SAFETY WARNING At no time should hands or tools be placed within the bowl or any A fitted tooling nor attempts be made to clear blockages whilst the machine is operating Bowl feeders vibrate at high frequency and contact with any of the moving surfaces could cause abrasions ISOLATE POWER SUPPLY NOTE Vibratory Parts Feeders may require a warm up time of 30 minutes before they reach optimum feed rate 2 1 Tuning Procedure Although the drive units are tuned during manufacture after tooling has been fitted it may be necessary to re tune your system Correct tuning of the vibratory system is essential to ensure that the optimum performance is achieved To tune the vibratory system follow the procedure below PROCEDURE Check that the control device has been connected correctly see 1 3 Setting up Procedure Remove the cover screws and then the cover Tighten all spring stack bolts to the correct setting see 5 0 TORQUE SETTINGS Check the air gap between the armature and the coil If necessary adjust the gap to the correct dimension See 3 1 Adjustment of Coil to Armature Clearance With the controlle
8. 90286 A290702 __ 2906 6 A290022 A290287 A290667 A290021 A294021 253006 A290680 A290020 A294020 A253005 290681 A290229 290289 290669 A290669 A290236_ A290308 A290701 A290654 6 EyeBot ______ A803106 A803107 A803107 A290230 A290274 A290425 290425 8 Rubber Ring A200712 EA 9 Rubber Edging Strip 256996 290233 A290271 200569 A290271 11 EndPlate ___________ _ A290232 A290270 A258004 A290270 4290240 290278 200570 290278 13 Spring Separator a200876 14 SpringBlock A257010 15 Spring Block Clamp A200878 3 gt EA _ 4803098 fie e OC ae 21 A801899 A801899 A801899 A801899 A801960 N Boo ojo A801923 A801901 A801901 A801695 A801682 A801954 A801947 a A801820 N A801827 A801827 A801831 A801831 A801907 A801907 A801907 ao ao 25 27 29 30 5 3 A801694 A801903 A801767 A801767 A801997 A801766 A801766 A801766 A801766 A801672 0 1 2 A 4 4 4 A801769 A801769 A801711 A801769 44 A290711 A290711 A290711 A290711 4 A290710 A290710 A290710 4 5 6 al 48 801821
9. Remove top plate complete with spring banks and bowl if fitted Note this must be performed by 2 people Remove all cable ties and remove terminal block cover and slacken off 3 terminals live neutral and earth 630 Remove 2 off M6 x 45 socket capscrews retaining faulty coil and trace cable back to terminal block To replace coil repeat steps 3 5 in reverse order Tighten 4 off M12 x 60 socket capscrews retaining top plate to required settings see 5 0 TORQUE SETTINGS Set coil to armature air gap see 3 1 Adjustment of Coil to Armature Clearance Refit cover Switch power supply on Unit is now ready for operation VIBRATORY PARTS FEEDER EURO SERIES 4 0 SPRING REPLACEMENT The springs have standard dimensions and require no adjustment after making a replacement PROCEDURE 1 Isolate power supply 2 Remove cover 3 Having identified the spring bank which houses the broken spring see 2 1 Tuning Procedure and 9 0 TROUBLESHOOTING remove socket capscrews retaining the identified spring bank making note of the position and thickness of the springs being removed Replace broken spring springs and reassemble spring bank Refit spring bank and insert socket capscrews top and bottom Release and re tighten all the other spring fixings Tighten each fixing gradually as you would a car wheel to reduce the strain imparted to the springs see 5 0 TORQUE SETTINGS Set coil to armature air gap se
10. ashers retaining coil Turn unit back to original position undo cable gland and extract coil pulling electrical cable through base unit To replace coil repeat steps 3 7 in reverse order Tighten 3 off M8 x 35 socket capscrews retaining top plate to required settings see 5 0 TORQUE SETTINGS Set coil to armature air gap see 3 1 Adjustment of Coil to Armature Clearance Refit cover Switch power supply on Unit is now ready for operation Isolate power supply Remove cover Remove 3 off lower M12 x 40 socket capscrews retaining spring banks to base casting but do not extract completely from spring bank as this retains spring spacers Remove top plate complete with spring banks and bowl if fitted Remove all cable ties and remove terminal block cover and slacken off 3 terminals live neutral and earth Remove 2 off M6 x 35 socket capscrews retaining faulty coil and trace cable back to terminal block To replace coil repeat steps 3 6 in reverse order Tighten 3 off M12 x 40 socket capscrews retaining top plate to required settings see 5 0 TORQUE SETTINGS Set coil to armature air gap see 3 1 Adjustment of Coil to Armature Clearance Refit cover VIBRATORY PARTS FEEDER EURO SERIES MODEL PROCEDURE Isolate power supply Remove cover Remove 3 off lower M12 x 60 socket capscrews retaining spring banks to base casting but do not extract completely from spring bank as this retains spring
11. ce as damage will occur to the plug Insert the replacement voltage plug ensuring that the screw holes in the plug are in line with the holes in the plug housing If the plug does not push home with only light pressure DO NOT FORCE IT ANY FURTHER The plug can only be inserted in one orientation Turn plug round and reinsert Reinsert 2 off M2 5 x 6 crosshead screws Do not use excessive force when tightening these screws as this will strip the thread of the voltage plug housing Refit cover Switch power supply on Unit is now ready for operation For full range of available plugs refer to the table below Always isolate power supply before attempting to replace any voltage plugs Voltage Frequency A803173 100 Hz full wave A803174 50 Hz half wave A803175 100 Hz full wave A803176 50 Hz half wave 3 3 Replacing the Complete Coil NOTE SAFETY WARNING It is strongly recommended that an Aylesbury Automation service engineer carry out coil replacement Should customers wish to effect this work themselves the instructions in this Section should be strictly adhered to Before carrying out coil replacement ISOLATE POWER SUPPLY VIBRATORY PARTS FEEDER EURO SERIES Note Model 150 200 250 open centre bowls only 400 and 630 coils can be removed with bowl in place The lower socket capscrew retaining the spring banks to the base machining on Models 250 400 and 630 may vary dependi
12. e 3 1 Adjustment of Coil to Armature Clearance Switch power supply on Unit is now ready for operation ALL 5 0 TORQUE SETTINGS The table below lists the torque settings for all socket capscrews requiring tightening when normal service procedures are carried out Under no circumstances must the settings listed be exceeded COMPONENT TORQUE 51150 51200 si250 51400 Top plate Bottom plate Coil Armature TO ENSURE THAT THE UNIT OPERATES AT ITS OPTIMUM EFFICIENCY AND TO PREVENT ANY DAMAGE TO THE UNIT DUE TO EXCESSIVE TORQUE THE ABOVE SETTINGS SHOULD BE ADHERED TO USING A TORQUE WRENCH VIBRATORY PARTS FEEDER EURO SERIES 6 0 MAINTENANCE WARNING By virtue of design the parts feeder will produce vibratory residue from the A products being fed It is the responsibility of the operating company to ensure that all relevant safety precautions are taken to handle any hazardous material at all times during operation cleaning and maintenance Daily 1 Wipe clean the bowl and the bowl tooling taking care to avoid the possibility of personal injury from any sharp edges or projections 2 Check the performance and look for dead spots as an indication of any broken springs see 9 0 TROUBLESHOOTING 3 Inspect and clean any air jets where applicable Weekly 1 SAFETY CHECKS Check that any safety or emergency devices where fitted are fully functional 2 Inspec
13. he electrical supply If it is not feasible to isolate the power supply when carrying out functional testing or adjustments any such maintenance must only be undertaken by technicians who are fully aware of the dangers involved and who have taken adequate safety precautions If the gap is too small the coil will strike the armature block Conversely if the gap is too great when the controller is turned to the maximum output the feeder does not produce sufficient power to move the part at the desired rate It also results in the heating of the coil and wasted energy To adjust the coil to the armature clearance follow the procedure below for your machine PROCEDURE With the power ON turn the controller to the maximum setting 100 Undo the M10 full nut located centrally at the bottom of the base until the coil is just touching the top plate armature Tighten the screw by turn This will give the correct air gap setting Isolate power supply Remove cover Check air gap between coil and armature Correct air gap 1 0mm is indicated on the side of the coil Slacken 1 off M6 x 40 socket capscrew retaining armature Place 1 0mm feeler gauge at each end of the armature Tighten 1 off M6 x 40 socket capscrew retaining armature Refit cover Switch power supply on Unit is now ready for operation Isolate power supply Remove cover Check air gap between coil and armature Correct air gap 1 0mm for all models except 400 1 and
14. ng on the number of springs fitted to the unit 9 10 Switch power supply on 11 Unit is now ready for operation PROCEDURE Isolate power supply Remove cover Disconnect plug from control box Remove plug from cable Remove cable clamp Remove 3 off lower M6 x 20 socket capscrews retaining spring bank to base machining but do not extract completely from spring bank as this retains spring spacers Remove top plate complete with spring banks and bowl if fitted Invert unit and remove M10 full nut and washer located on underside of base retaining coil Turn unit back to original position and extract coil pulling electrical cable through base plate To replace coil repeat steps 3 7 in reverse order Tighten 3 off M6 x 20 socket capscrews retaining top plate to required settings see 5 0 TORQUE SETTINGS Set coil to armature air gap see 3 1 Adjustment of Coil to Armature Clearance Refit cover Switch power supply on Unit is now ready for operation Isolate power supply Remove cover Disconnect plug from control box Remove plug from cable Remove 3 off lower M8 x 35 socket capscrews retaining spring banks to base casting but do not extract completely from spring bank as this retains spring spacers Remove top plate complete with spring banks and bowl if fitted Invert unit and remove 3 off M6 x 20 socket capscrews and M6 washers retaining base plate Remove base plate Remove 2 off M6 x 40 socket capscrews and M6 w
15. r running slowly loosen the bottom clamping screw on one of the spring stacks This will produce a change in the speed of the components being conveyed inside the bowl If the feed speed decreases install one additional spring at a time with shims in between the mating surfaces Springs should be fitted evenly around the unit If the feed speed increases remove one spring with its shims one at a time evenly from each stack until the correct speed is obtained If the feed rate is irregular on the periphery of the bowl then either Remove one spring from the stack under or after the slow spot in the direction of travel Install one spring from the stack under or after the fast spot in the direction of travel Add counterbalance weights to the opposite side of the slow spot Note All tooled bowls are correctly balanced before leaving our factory It is important that all counterbalance weights are of the appropriate weight and fitted correctly 2 2 Recommended Parts for Tuning It may be necessary to balance an untooled bowl if additional tooling is fitted The following counterbalance weights are available from Aylesbury Automation PARTNo WEIGHT A805170 A805200 A805400 VIBRATORY PARTS FEEDER EURO SERIES 3 0 COIL 3 1 Adjustment of Coil to Armature Clearance SAFETY WARNING The electrical power used in this equipment is at mains potential Before A carrying out maintenance or repair isolate t
16. riginal drawings and manufacturing tolerances and are therefore completely interchangeable with the originals Orders or enquiries about machine parts should be directed to the Sales Department quoting the machine reference number clearly stamped on the machine identification plate and the part number In this way reference can be immediately made to the details and drawings of the machine Spares of certain items should be kept in stock by the customer to ensure immediate availability this particularly applies to those items which are susceptible to wear or abuse these are marked with on the parts list page NOTES Orientation tooling is not normally supplied as a spare When required a service engineer can be contacted to manufacture and replace on site or the bowl and drive should be returned for the work to be carried out by the manufacturer THE BOWL COATING IS CLASSED AS A CONSUMABLE ITEM AND AS SUCH GENERAL WEAR AND TEAR IS NOT COVERED UNDER THE NORMAL WARRANTY 11 0 DECOMMISSIONING WARNING By virtue of design any dynamic parts movement system may produce A component contact residue from the products being fed It is the responsibility of the operating company to ensure that all relevant safety precautions are taken should any hazardous materials be present during cleaning and maintenance To decommission the vibratory parts feeder at the end of a run follow the procedure below Run the vibratory parts feeder until
17. t the feeder tooling for any wear and replace where necessary 3 Monthly 1 Check the torque of all spring bolts See 5 0 TORQUE SETTINGS 2 Check the tightness of all the rubber feet and tighten if required 7 0 NOISE REDUCTION Whilst every attempt has been made by using the most appropriate materials and bowl feeder coatings etc due to the nature of vibratory feeders some components may generate unacceptable noise levels In this instance to reduce the noise emission from the components in the bowl an optional acoustic enclosure can be fitted this reduces the noise level by approximately 10dB A which can be increased further by the addition of an internal lining This noise reduction does depend however entirely on the products being fed the feed rate and the bowl construction The acoustic enclosures are manufactured in a sound absorbing material incorporating a clear removable lid that is split to allow easy refill of the bowl A range of sizes is available to accommodate tooling 8 0 GUIDELINES FOR ADDING ORIENTATION TOOLING IF NOT FACTORY FITTED If you wish to add orientation tooling to an untooled bowl please read the following guidelines e All tooling fitted to the vibratory parts feeder should be of a light but rigid construction e tooling must be securely fixed to the bowl to achieve the maximum performance e Discharge tooling beyond the normal bowl outlet position should be kept to a minimum and NOT project
18. the top plate or the bowl as this WILL strain the A springs and alter the coil setting N See Technical Description for the weight of the parts feeder to enable it to be lifted safely into position WEIGHT MODEL NUMBER HANDLING UNTOOLED UNIT Lift carefully into its operating position Remove the spare springs and shims untooled units only then move the v p f carefully into its operating position Remove the spare springs and shims untooled units only then move the v p f into position using the eyebolt supplied with the unit 250 53 2 Kg 250 amp 400 located in the centre mounting hole of the bowl Once the unit is ositioned the eyebolt should be removed and the rotating centre a bowl plug ee into position 400 120 0 Kg Remove the spare springs and shims untooled units only then move the feeder into position using the three eyebolts which are attached to the base casing of the unit and can be accessed by 9 260 0 Kg removing the cover Once the unit is positioned the cover should be replaced The three eyebolts may remain fitted in the base Remove the spare springs and shims untooled units only then move the feeder into position using the three eyebolts which are attached to the base casing of the unit and can be accessed by 240 0 removing the rotating centre Once the unit is positioned the rotating centre should be replaced The three eyebolts may remain fitted in the base 625
19. utomation Sales Department on Tel 44 0 1296 314300 Fax 44 0 1296 482424 VIBRATORY PARTS FEEDER EURO SERIES Contents Page No Certificate of conformity incorporation Pocket inside front cover Technical Specification Pocket inside front cover 1 0 INSTALLATION 1 1 Services 1 1 2 Unpacking and Handling 1 1 3 Setting up Procedure 1 2 0 TUNING THE UNIT 2 1 Tuning Procedure 3 2 2 Recommended Parts for Tuning 3 3 0 COIL 3 1 Adjustment of Coil to Armature Clearance 4 3 2 Replacing the Voltage Plug 5 3 3 Replacing the Complete Coil 5 4 0 SPRING REPLACEMENT 8 5 0 TORQUE SETTINGS 8 6 0 MAINTENANCE 9 7 0 NOISE REDUCTION 9 8 0 GUIDELINES FOR ADDING ORIENTATION TOOLING IF NOT FACTORY FITTED _ 9 9 0 TROUBLESHOOTING 10 10 0 RECOMMENDED SPARES 11 11 0 DECOMMISSIONING 11 Parts List All Models Assembly Drawing Model 150 Assembly Drawing Model 200 Assembly Drawing Model 250 Assembly Drawing Model 400 Assembly Drawing Model 625 Assembly Drawing Model 630 VIBRATORY PARTS FEEDER EURO SERIES 1 0 INSTALLATION 1 1 Services The following services are required before the machine can be installed 200v 50 60Hz Single Phase or 100v 50 60Hz Single Phase 1 2 Unpacking and Handling NOTE The user is recommended to retain the packaging If any damage has occurred to the equipment Aylesbury Automation will need to inspect all materials WARNING Do not lift the V P F by
20. wl tooling is loose Tighten all tooling fixtures Rubber foot is loose tighten Metal cover is loose tighten screws Rotating centre jammed eliminate jamming Foreign bodies in coil gap clean then check the gap adjust if necessary see 3 1 Adjustment of Coil to Armature Clearance Coil gap or gaps incorrect adjust see 3 1 Adjustment of Coil to Armature Clearance Before any maintenance is carried out ISOLATE POWER SUPPLY Tick When Checked Bowl tooling is loose Tighten all tooling fixtures Check tuning and control box settings Too many components in bowl overloading remove some product Check that the bowl is fixed to the drive unit Check for broken springs If after changing the position of the bowl on the unit the dead area moves to a new position in the bowl then it would be reasonable to expect one or more broken springs see 4 0 SPRING REPLACEMENT and 2 1 Tuning Procedure Check for broken welds This can be determined by relocating the bowl 120 on the unit If the feeding problems remain at the same point in the bowl it can be assumed to be within the bowl structure Bowl tooling is loose Tighten all tooling fixtures VIBRATORY PARTS FEEDER EURO SERIES 10 0 RECOMMENDED SPARES It is essential for the continuing safe and efficient operation of your machine that only genuine replacement parts are used These are made to o
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