Adam Equipment PW ANALYTICAL BALANCES
Contents
1. Metallic housing Step 21 Fix the top plate with the main PCB and the Filter Board by fastening the top 4 screws Ensure the two plastic clips are tied along with the Screws as it was originally placed Top plate with PCBs Plastic clip for cable tidy Step 22 Tuck the display cable into the slot on the metallic housing as shown here to make sure it does not touch the weighing pan after the balance is assembled Slot for tidying the display cable Adam Equipment Company 2007 23 Step 23 Place the front glass in the Original position Fasten the 2 plastic screws at the bottom as shown here Bottom Plastic Screws x 2 Step 24 After the balance frame is installed align the holes on the horizontal beams of the frame with the two top holes on the glass and fasten the screws Top Plastic Screws x 2 NOTE After the repair is complete and the balance is re assembled it is suggested that the balance is Temperature calibrated using a Constant Temperature Chamber or in a suitable room particularly for few cases as described in Table 9 given below TABLE 9 GUIDELINE FOR TEMPERATURE COMPENSATION Adam Equipment Company 2007 24 7 0 DEALER PARAMETERS The parameters available to the users are described in the User Manual in details This section describes the parameters available to the dealers for setting up the balance Access to these parameters is controlled by password e From the s2. eere 23 7 0 DEALER PARAMETERS ereronde up MEE S unineme aan 25 8 0 INTERNAL CALIBRATION MASS ADJUSTMENT eese 28 90 CABLES AND CONNEGTIONS xy pex pene tnt tera 30 10 0 BALANCE MENU DIAGRAMS vs tieu a eda eoe oie potia eina e a rn erae ei vr eei eus 31 TEO JBALANGCE DIAGRAMS wasiak eoe EA Eee AEO AO 34 Adam Equipment Company 2007 1 1 0 INTRODUCTION The PW series of analytical balances are very precise devices used to measure mass in laboratory conditions To achieve precise measurements you should make sure the balances are in suitable environments and the conditions are as described in the Operators Manuals There are no user serviceable parts in the balance All service and repairs should be done only by Service Personnel trained and approved by Adam Equipment Automatic temperature compensation Multiple weighing units Capacity tracker Date and time Easy to use sealed keypad Below balance weighing facility Password protection security locking point Robust metal casing Adam Equipment Company 2007 FEATURES Large easy to read LCD display with backlight Standard applications include weighing check weighing percentage weighing parts counting animal dynamic weighing net total and density determination Internal Calibration using motorised internal calibration weight or external calibration if set
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4. OH HI JH eT ed HH IHE A ELE Hi ee 23 Wed dv Agno aY w AO EET qa I HLLIN H me ax ZE I px qq Fon Bay I CU 34 Adam Equipment Company 2007 HO FI CI EHH BEI OE CH 018 ee Ina kd SN ALS OA mad O HHMH TAD a E EE 4H Sd am Hi AFA AMYAN IN30 dO 3 a 7 8 OFT JINSA JD bib weg a z san oes INEA 2531 10 Ie Q0 4 I HLLIN H 35 Adam Equipment Company 2007 Glass Securing Casting 6 8 __ Adam Equipment Company 2007 36 6 Securing Screw for the Frame Adam Equipment Company 2007 37 Calibration Motor Support Bracket Cam Securing Screw Opto Switch Cam Adam Equipment Company 2007 38 Magnet 0 Adam Equipment Company 2007 39 ANNEXURE TABLE 14 PW SELECTED PART NUMBERS PART NUMBER 7067 8087 6095 7068 3205 3206 3207 3204 7064 7073 3434 7326 7117 7116 7115 7118 7217 7107 7474 7223 7125 7124 7034 7236 7228 7236 7237 NOTE Refer to the drawings for the item number corresponding to this list If spare parts are required identify the model number and serial number of the balance Contact your supplier for further details price and availability of all spare parts The circuit boards do not have user serviceable par
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6. clock wise and and the screw B clockwise by the same the screw B anti clockwise by the same angle angle PW Weighing Pan PW Weighing Pan After setting the adjustment you should place the balance to one side for some time and weigh on it occasionally This helps to reduce the internal tensions Re test again and continue adjusting if necessary Adam Equipment Company 2007 14 5 4 LINEARITY TESTING Typical line e Place the weights on the balance covering the balance range from minimum to om maximum as suggested in the table below we Check deviations of the displayed values from the actual values on the weights on pan e f necessary re calibrate e Ensure the environment is stable the warm up time is as specified and preferably the Class E2 weights are used during Linearity Testing Check accuracy of linearity Examples of the weights that can be used for testing are given in the table below TABLE 7 SUGGESTED MASS FOR THE LINEARITY TESTING 200 Jooo eoo sos ooo zos Teos os sens sos 200 eoo eoe sons 1200 1409 1600 1009 NM ers NN 2509 PW 254 100 209 409 509 1009 1209 1500 2009 220g 2509 It is necessary to know the values of the masses used to an accuracy that is better than the balance weighing results NOTE The accumulation of errors when using multiple masses can contribute to a larger apparent error Refer to Table 3 If you are usi
7. for the external mass is greater than the actual value of the mass then reduce the internal mass value by the difference Enter this reduced value when prompted by the display For example if the internal mass previously set is 100 054g and the display reads 100 050g when using an external mass of 100g then reduce the internal mass value by 0 050g Enter the new revised value of 100 004 in place of 100 0549 when prompted The adjustment can be done for up to 100mg e Repeat the calibration and check the value of the external mass again e Repeat this procedure until the value displayed is correct for the mass used e Press Esc to return to normal weighing Adam Equipment Company 2007 29 9 0 CABLES AND CONNECTIONS a i is EE m oe ke Ur Intern Calibrabon Motor amp csembiy Interface FCB Power Adam Equipment Company 2007 30 LE 4002 ueduio5 luswdinb Wepy nuew Je eep Aejdsi j 1e ee nuew Josiajadns Ae dsi JOSIAJ8dNG epoossed Je E8p epoossed JosiAiedns 18 U3 NM S9A ON pejqeue epoossed 1051 Aay dnjas pijos 82u819j81 JO euin oA 1ejquj pinbrq 99 6 pinbi jo Ayisuep 140 2 joueuje 19ju3 jour yg 9 eunje1eduje 1ejuj ________________ pios Ayisueg 7 BuryBiem JENN spuooes
8. in the currect position on the lifting bracket The pan support should be exactly in the centre of the ring Adam Equipment Company 2007 20 wail A 1 S Na NN P LE Ba RE Step 14 To change the motor or the Cam Step 15 If you need to replace the remove the screw using the 3mm Allen Calibration mass lifter remove the 2 Hex Keys screws using the 3mm Allen Hex Key as shown here 6 3 REPAIRING THE MECHANICS NOTE PW Analytical Balance is a highly sophisticated balance repairing of which calls for a lot of experience and skill Unless the technician is trained and adequately experienced it is suggested not to proceed with the repair work mention in this section Beam aligning tool Vertical flexure Puller PW 254 Max 250g d 0 00019 Step 16 If you need to change the Puller or the vertical flexures hold the Beam Aligning tool not supplied as shown above to retain the alignment and any further damage to the mechanics Remove the damaged flexure by using the 3 mm Allen Hex Keys and fix the new one For further repairing of the mechanics contact your supplier If you decide to replace flexures the following guidelines may help e Replace only with the correct flexure procured from Adam Equipment See table 1 for details Adam Equipment Company 2007 21 If possible only replace one flexure at a time Keep all flexures aligned vertically horizontally and from front to back The ac
9. the mechanics to look for sources of friction Verify the A D is also unstable If the A D is OK then suspect the programming of the balance Reset parameters check temperature compensation and redo the Electronic problems calibration oome electronic problems can also cause this But all mechanical problems must be resolved first BALANCE IS NOT ACCURATE You must have accurate and trusted weights to test a balance If you suspect that the balance is not accurate then you must know your weights are accurate A balance calibrated using a bag of flour is not accurate even if it works OK otherwise Balance is not accurate Hepeatability Verify the balance shows the same value when the same mass is placed on the centre of the pan for a few tests RCIE Verity the balance shows the same reading within a tolerance depending upon the model when a mass is placed at positions around the pan WER Verify the balance is acceptable throughout the weighing range The balance must give acceptable readings from low weights up to the capacity Poor Repeatability Usually a mechanical Inspect the area around the pan for hair problem dust or other obstructions Inspection of the mechanics may be needed for any possible problems Poor Eccentric loading A mechanical problem Inspect the area around the pan for hair dust or other obstructions Adam Equipment Company 2007 9 Inspection of the mechanics may be needed fo
10. the next point half way between center and edge of the pan Record the results for each point e The readings on the edges should match with the reading at the center point within the tolerances shown Adam Equipment Company 2007 12 If the differences in the weighing values at the 5 locations are bigger than 5 divisions you TABLE 6 ECCENTRIC LOADING ERRORS Balance model Mass Acceptable error PW 124 50g 0 3 mg PW 184 PW 214 100 g 0 3 mg PW 254 100 g need to adjust the balance for Eccentric loading as given below ECCENTRIC LOADING ADJUSTMENT These adjustments will result in moving the mounting polnts for the flexures so that the mechanical assembly is set right to produce the same weighing results regardless of the position of the mass on the weighing platform The adjustment is done using the Star Screw Driver on the two Counter Sink Screws on the mechanics as shown below The amount of adjustment and the direction by which the screws are turned will depend on the amount of error observed as the mass is moved around the platform Counter Sink Screws x 2 Clock wise adjustment of the screw Counter clock wise adjustment of the screw Place the balance on a suitable and stable surface Mount the pan on the pan supports Remove the top cover of the balance Do not unplug the display cable Locate the Counter Sink Screws at the rear as shown above to adjust the eccentric loading Use the
11. to detach the filter board to remove screw 3 amp 4 which are just below the filter board Hold the base of the screw attaching the filter board to the main PCB with a spanner for a better grip Adam Equipment Company 2007 19 Step 8 To detach the top plate along with the main PCB remove the 4 screws using the Philips Screwdriver as shown Replacing the main PCB can be done by removing the 4 screws on the board which attaches it to the top plate Top plate Screw 1 PP To remove top plate Screw 2 amp 3 with plastic clips for tidying the cables Filter PCB Screw 4 Spanner 3mm Allen Hex Key Step 10 Lift the filter PCB and remove the 2 screws 3 amp 4 as shown in Step 9 to detach the top plate You may now change the filter board if needed Filter PCB Top plate Main PCB including the filter PCB Step 11 Hold the PCB unit in one hand and carefully slide the metallic housing for the assembly upwards with the other hand Take care not to damage any cables or flexures Step 12 If you need to check the internal calibration mechanism remove the stainless steel weighing pan and then the 4 screws attached to the Aluminium plate using the slotted screw driver Aluminium Plate Calibration motor Cam with PCB Pan support arm Calibration weight in the form of a circular ring Tapered pan support Calibration mass lifting mechanism Step 13 Check whether the weight is sitting
12. 0g 0 060 5 1 REPEATABILITY TESTING AT INTERNAL CALIBRATION MASS Repeatability is checked at the approximate value of the internal calibration mass Perform automatic calibration Place the weighing mass on the pan as shown in the table below Repeat this procedure 5 times Compare the reading results with the actual mass Compare results the readings with the mass on the pan should agree within the acceptable error as shown Adam Equipment Company 2007 11 TABLE 4 REPEATABILITY ERRORS AT INT CAL MASS Balance model Mass Acceptable error PW 124 100g 0 4 mg PW 184 100 g Wat 100 pw a5 100 5 2 REPEATABILITY TESTING AT FULL CAPACITY e Place the mass on the pan as shown in the table below e After stabilization record the reading e Take off the mass and after stabilization record the reading with no mass on the pan e Repeat 5 times e Compare results the readings with the mass on the pan should agree within the acceptable error as shown TABLE 5 REPEATABILITY ERRORS AT FULL CAPACITY Balance model Mass Acceptable error S D PW 124 120 g 0 4 mg PW 184 180 g REPEATABILITY ADJUSTMENT If the errors are still not acceptable refer to section 7 0 for adjustment 5 3 ECCENTRIC LOADING TESTING Check the balance readings in the positions marked Place the mass shown in the table below at the center of the pan After stabilization record the value Move the mass to
13. ADAM Adam Equipment PW ANALYTICAL BALANCES SERVICE MANUAL ADAM EQUIPMENT CO LTD P N 8235 Rev A8 November 2007 Adam Equipment Company 2007 Adam Equipment Company 2007 CONTENTS O INTRODUORNON erc rS 2 20 DESCRIPTION OF CONSTRUCTION idit thee d dee a Ed Foe eoa E Pr eoa EP eva etd 3 2 1 PRINCIPEE OF OPERA MON ne roc ni lr a eta tnt 3 2 2 MODEL DIFFERENCED ruere w dz dzy 5 2 3 INTERNAL CALIBRATION MECHANISM seems 6 2 4 EQUIPMENT AND TOOLS REQUIRED eese 6 30 COMMON FAULT c itih 40 HRHOUBLE SHIOOTING GUIDES mds iv d beu or RED EP EE tee 8 9 0 FUNCTIONAL TESTS AND ADJUSTMENTS eene 11 5 1 REPEATABILITY TESTING AT INTERNAL CALIBRATION MASS 11 5 2 REPEATABILITY TESTING AT FULL 12 553 ECCENTRIC LOADING TES TING vs cO dit di ut a Enn toa ui S t tent tta 12 S4 JUNEARLY TESTINO E i A 15 6 0 MECHANIGAL REPAIBS 35 itti Ak te ursa r 16 6 1 REPAIRING THE BROKEN GLASS 16 02 REPAIRING INTERNAL AR Owa air tore ree hone ee bis o teu oe Rhea hos 18 63 REPAIRING THE MECHANIC Scarsi A de bos eraat 21 64 REPAIRING THE KEYPAD AND LGD uiii ie dei dee neo Ed eee des 22 6 5 RE ASSEMBLING THE BALANCE PARTS
14. Philips Star Screw Driver to adjust Always adjust for the largest differences first i e either the difference in value when the mass is placed at back to front or that of side to side whichever difference is the largest should be adjusted first Re check the readings after each adjustment For small corrections the screws will be turned by very small angles The value of the mass used for adjustment should be of 1 3 to of the balance Capacity When placing the mass on the pan locate it at 2 the distance from the centre to the edge Adam Equipment Company 2007 13 Refer to the following instructions for details A When the difference is greater in case of back to front of the pan than that of side to side do the front to back adjustment first Direction for adjustment Direction for adjustment If the reading is more at the front If the reading is more at the back turn turn both the screws clockwise as both the screws anti clockwise as shown shown above by the same angle above by the same angle C PW Weighing Pan PW Weighing Pan B When the difference is greater in case of the mass placed from side to side than that of the mass placed from back to front do the side to side adjustment first Direction for adjustment Direction for adjustment If the reading is more at the right side of If the reading is more on the left side of the pan turn the screw A anti clockwise the pan turn the screw A
15. Resetting the parameter to a normal value will restore operation Mechanical Problems The balances consist of complicated and fragile mechanical devices They can be damaged by placing a weight on it which is too high for the balance or by dropping the balance or occasionally damage caused by careless shipping The most fragile parts are the flexures Dust dirt spills and other foreign objects in the balance can also cause problems Shifting of calibration mass during shipping may cause weighing problems Electronic Problems These are the rarest of the problems affecting balances If an electronic problem is Suspected make sure the mechanical problems that can cause similar symptoms have been eliminated before attempting electronic repairs With the exception of cables most electronic repairs are solved by PCB replacement The Electronics modules within the balance are not serviceable In case of any electronics component failure contact your Supplier The following table provides a guideline on the common problems Note that many problems may have multiple solutions and there may be problems found that are not listed in the table For more Information contact your supplier TABLE 2 TROUBLE SHOOTING BALANCE DOES NOT FUNCTION Suggestions The balance is dead Power supply failure Check adapter is working when power is applied Cable Connector Check adapter is correct for the balance fallure Normal adapter is 15VDC 800mA Power s
16. by the user Bi directional RS 232 interface Can be configured to print a GLP Compliant report after each calibration to include the time date balance number and a verification of the calibration Display in 4 languages English French German and Spanish 2 0 DESCRIPTION OF CONSTRUCTION 2 1 PRINCIPLE OF OPERATION The PW balances use an electro magnetic force restoration or force motor type mechanics that converts a force generated due to an unknown mass placed on the weighing pan into a voltage which can be measured by a high precision voltmeter The force restoration system uses a magnet section along with a coil to convert a current through the coil into a force This force will balance the force caused due to the unknown mass on the balance pan This is accomplished in a system using a method of applying the force from the unknown mass on one end of a beam and balancing it with the force generated due to the current in the coil on the opposite end The balance position is detected by an optical detector connected to the beam When the mass is placed on the balance pan the beam will be moved out of its original null position This movement is detected by the optical sensor An amplifier connected to the sensor will change the current through the coil to force the beam to go back to its null position The amount of change in the current through the coil is proportional to the unknown mass on the pan The current passes through a preci
17. cal use Retail Scales for Price computing Adam Equipment Co Ltd Adam Equipment Inc Adam Equipment S A Pty Ltd Adam Equipment S E ASIA Bond Avenue 26 Commerce Drive 7 Megawatt Road Pty Ltd Milton Keynes Danbury CT Spartan EXT 22 Kempton Park 2 71 Tacoma Circuit MK1 1SW 06810 Johannesburg Canning Vale Perth UK USA Republic of South Africa Western Australia Tel 44 0 1908 274545 Tel 1 203 790 4774 Tel 27 0 11 974 9745 Tel 61 0 8 6461 6236 Fax 444 0 1908 641339 Fax 1 203 792 3406 Fax 27 0 11 392 2587 Fax 61 0 8 9456 4462 E mail E mail E mail E mail sales adamequipment co uk sales adamequipment com sales adamequipment co za sales adamequipment au com Copyright by Adam Equipment Co Ltd All rights reserved No part of this publication may be reprinted or translated in any form or by any means without the prior permission of Adam Equipment Adam Equipment reserves the right to make changes to the technology features specifications and design of the equipment without notice All information contained within this publication is to the best of our Knowledge timely complete and accurate when issued However we are not responsible for misinterpretations which may result from the reading of this material The latest version of this publication can be found on our Website Visit us at www adamequipment com Adam Equipment Company 2007 42
18. g linearity calibration the procedure will be aborted with no new data stored and any previous linearity calibration data will be retained TABLE 12 MASSES NEEDED FOR LINEARITY CALIBRATION BALANCE MASSES FOR LINEARITY CALIBRATION MODEL PW 124 10g 20g 30g up to 130g PW 184 10g 20g 30g up to 190g PW 214 20g 40g 60g up to 220g PW 254 20g 40g 60g up to 260g NOTE For better accuracy only use Class E2 weights for linearity calibration Adam Equipment Company 2007 27 8 0 INTERNAL CALIBRATION MASS ADJUSTMENT TABLE 13 LIST OF INTERNAL CALIBRATION WEIGHTS Balance model Internal Calibration mass approx PW 124 100g PW 184 100g PW 214 100g PW 254 100g NOTE The value of the internal mass is not an exact number such as 100g It must be set by comparing with an external mass The exact value can be set using the Supervisor Parameter section as described in the User Manual section 13 5 provided this feature is enabled at the factory PROCEDURE e Make sure the balance is level and has been ON for 4 hours or more at a stable temperature e Calibrate the balance twice This helps to reduce any stresses in the mechanics e o verify the accuracy of this internal calibration place an external mass approximately equal to the same internal calibration mass Record the result e Enter the Internal Calibration section using the Supervisor passcode as per the following procedure e Pres
19. ion follows in section 4 0 In order to know if a balance is working properly it will be necessary to carry out some performance tests on the balance See section 5 0 for the details A brief description of the mechanical adjustments is covered in section 6 0 In most cases the first thing to be considered as a part of trouble shooting is the software parameters as this is the main method used to set calibration and linearity set parameters view temperatures sensor values and perform the most basic of calibration functions See section 7 0 to enter the Dealer Parameter Settings Faults associated with these balances leading to inaccurate weighing are generally of the following types a Calibration and Linearity faults See section 5 0 amp 7 0 b Mechanical faults See section 6 0 c Electronics faults See the note below NOTE The Electronics modules within the balance are not serviceable In case of any electronics component failure contact your supplier Adam Equipment Company 2007 7 4 0 TROUBLE SHOOTING GUIDES service of a balance will generally be necessary when the balance does not perform as expected The balances are not user serviceable Problems usually fall into one of the following categories User Problems The user is asking the balance for something it cannot do or is confused by the modes and functions of a balance It is also possible the user has set a parameter that has affected the balance operation
20. it will be necessary to carry out the following tests on the balance These tests should be performed initially when it is not clear whether there is any problem with the balance These tests should also be performed anytime a balance has been serviced or any changes are made Before performing the tests the balance should be allowed to warm up in a stable environment for a minimum of 4 hours During this time the following should be checked e Install the pan supports the pan and the breeze shield if applicable and make sure they do not interfere with correct weighing e Level the balance e Verify all the keys work properly and the functions set are suitable for the balance to be tested For example set to grams weighing all digits operating normally the filters set to a normal setting etc e Verify the RS 232 is operating correctly using a communications program e Verify the display is correct the minus sign is shown decimal points are in the correct position the weighing unit is correct and the stability symbol is correct e Verify the calibration is functioning correctly For better accuracy we suggest to use only the Class E2 weights during the linearity adjustment The maximum permissible errors of E2 weights are given in the Table below TABLE 3 OIML R 111 TEST WEIGHT TOLERANCES Class E2 Weight Value Maximum Permissible Errors 200 g 0 30 mg 100 g 0 15 mg 50g 010 mg 20g 0 080 mg 1
21. lastic coated screws NOTE e he glass windows on the sides and top can be replaced by removing the balance cover The glasses are secured by a plastic stop pressed into the rail Remove the stop using needle nose pliers and slide the old glass out Replace with new glass Glue new handle onto the glass in position using double back tape supplied with the handles Place the stop back into the guide to prevent the window from opening too far if the balance is tilted To replace the front glass the 4 screws securing the glass can be removed and new glass installed During other repair works in most of the cases you do not need to remove the front glass shield unless it is broken and needs to be replaced Adam Equipment Company 2007 17 6 2 REPAIRING THE INTERNAL PARTS Step 7 To gain access to the internal mechanism you may need to detach the outer metallic frame by removing the side screws 4 on each side using the 4mm Allen Hex Keys Internal Calibration Cable A M ele I Display Cable 92 8 a 8 S gt lt Keypad Cable Sensor Cable ERES B Hx i TR Tg va i Pudor e Td Bi W Optical Sensor Cable Re E LASS Jes d Ju za pa EE oi mA a Power Cable AY A T on lt lt View of the Main PCB Adam Equipment Company 2007 18 Hg dne z js x NW seal A Mig nod 0 Step 9 You may need
22. lected Pressing the Print key sends the stored configuration data as a formatted table with address headers to the RS 232 port at 9600 baud 8 bits no parity irrespective of the settings chosen in serial setup on the supervisor menu Pressing the Setup Enter or Mode key escapes to the next item on the dealer menu Pressing the Esc key returns to weighing 3 CALIBRATE This menu offers two options A TEMP CAL Select the LOW or HIGH temperature calibration point Enter the balance temperature 10 to 40 deg C If the low temperature calibration point is selected the entered temperature must be at least 10 degrees below the one stored for the high temperature calibration point otherwise the display will show ERROR HI If the high temperature calibration point is selected the entered temperature must be at least 10 degrees above the one stored for the low temperature calibration point otherwise the display will show ERROR LO If the entered temperature is within range the display will show the message LOAD 0 Ensure that the weight pan is clear then press Setup Enter After measuring the no load weight the display will prompt to load the external calibration mass Load the required mass and press Setup Enter Adam Equipment Company 2007 26 lf temperature calibration at the other temperature has already been performed successfully after measuring the weight of the calibration mass the inst
23. ng 200g amp 50g masses to make 250g there may be an accumulated error of 0 30mg 0 10mg 0 40 mg The error at each value is determined by computing Error Displayed mass actual mass TABLE 8 LINEARITY ERRORS Balance model Acceptable error PW 124 0 4 mg PW 184 Pw 214 PW 254 LINEARITY ADJUSTMENT If the values are still not acceptable refer to section 7 0 for Linearity adjustment Adam Equipment Company 2007 15 6 0 MECHANICAL REPAIRS The mechanical repairs which are normally required will be Replacing the broken glass shutters see section 6 1 Repairing or replacing the internal parts including the internal calibration system see section 6 2 Replace broken or damaged flexures see section 6 3 Replacing the Keypad and LCD Panel see section 6 4 6 1 REPAIRING THE BROKEN GLASS SHUTTERS Rear Screw 1 Rear Screw 2 Housing for Rear Screw 3 mechanics Rear Screw 4 Step 1 First remove the 4 screws on the Step 2 Lift the balance top cover by rear panel using the 3mm Allen Hex Keys carefully sliding it upwards Side glass door Step 3 Remove the side glass doors by lifting it slightly upwards while sliding it out of the channel Adam Equipment Company 2007 16 Top Glass door handle Front glass shield A n a t d wi V LL Step 5 Remove the top 2 x plastic coated Step 6 Next remove the bottom 2 x screws from the front glass shield p
24. ojry 5 sun 9jqeu3 SLINN HOSIAH3dnS 001 e jeuJejur jsn py uomneaqi eo WIOPed 25 eo ybiy 191043 96 moj 19103 pa L 8 N 0096 1 1ndino epeq MSU eg Meu eg 9 dws e9 0jne 18S sanou e5 ojne eS ct SHA PORY ON o qeue jed eulslu peo uomneaqi eo Ajueaur eJnjyeJeduJe uBiH eJnjeueduJa MO lo eo uoneunDijuoo peojumoq ejep uomnean6ijuoo peojdn SS91d 4JALLOV S ejdsig pe ej dsip slunoo Jqy N3O UO e qejeAe JON 4002 1ueuidinb3 wepyo eo 9 JLVHSITVO yndjno SIWOO V LVG Asy LINN Sjunoo Jdv sjunoo Aejdsiq SLNNOD 2av 191u3 191u3 10581 4410 21 e2 oiny 440 Lown NO 440 uodei uoneiqueo SJA ON Uuoieiqieo ejqeu3 dd 1VA0 wodo 1 sapoossed 8S SJJOJSSVd uonejqijeo dnjes 40135 1V2 11 0 BALANCE INNER DIAGRAMS dns Iv 25 oof dung Jena APS AN resa Se INE Ard JD oer 4534 Jn HI TIO BH BREL
25. on selection or starts automatically when the time or temperature of the system changes by a pre set value with respect to the time or temperature of last calibration Automatic function of calibration can be disabled by the user in the calibration sub menu 2 4 EQUIPMENT AND TOOLS REQUIRED The following tools and equipment may be helpful when working on the balance GENERAL TOOLS AND EQUIPMENT Screwdriver Philips Screwdriver Medium Flat Allen Hex Keys 3 mm 4 mm Needle Nose Pliers ooldering iron Precise square olide calliper magnifier X10 Voltmeter Oscilloscope Adam Equipment Company 2007 6 SPECIAL TOOLS AND EQUIPMENT Weighing mass OIML Class E2 Calibration and test masses should be used that will cover the weighing range of the balance to be tested The masses should be of high accuracy or the actual mass should be known if less accurate masses are used Suitable place for temperature tests A Constant Temperature Chamber or alternatively a room capable of holding a steady temperature of 1 C and a differential temperatures of minimum 10 C and have a suitable table or platform for the balances to be stable for performing the temperature compensation This is required if the memory is cleared wrong temperature compensation values are used or if the magnet has been modified Repair of flexures normally do not require temperature compensation See Table 9 details 3 0 COMMON FAULTS A general troubleshooting sect
26. r any possible problems Readjusting of the Eccentric loading is recommended Poor Linearity Usually a mechanical Re check repeatability problem Inspection of the flexures for damage or loose hardware may be required Use the Linearity Function in the service menu to reset linearity Problem in analogue circuit board or power supplies can cause poor linearity Make Electronic Problems sure all mechanical problems have been eliminated first OTHER PROBLEMS Cannot calibrate Zero shifted more than Check all flexures for damage allowed Reset factory calibration Verify linearity and repeatability The balance may be unstable Verify stability as above Try using a more aggressive filter Calibration weight motor Check cables to the motor try plugging the does not stop balance into the power again Look for friction in the calibration weight movement Check the opto coupler that controls the motor position RS 232 not working Doesn t print Check parameters match the device connected Verify cable is correct HS 232 circuits damaged Display dark keys beep Display contrast poor Check the cables to the display Cable damaged Replace display it may be damaged LCDs on the display are faulty or damaged To be carried out by authorised technicians only Adam Equipment Company 2007 10 5 0 FUNCTIONAL TESTS AND ADJUSTMENTS In order to know if a balance is working properly
27. rument will display the current temperature correction in parts per million per degree Celsius as PPM CORR xxx until any key is pressed to return to the TEMP CAL menu option If temperature calibration at the other temperature has not been performed the instrument will return immediately to the TEMP CAL menu option Pressing the Mode key at any time escapes back to the TEMP CAL menu option Pressing the Esc key at any time returns to weighing If any measurement errors are encountered an appropriate error message will flash on the display until any key is pressed when the instrument will return to the TEMP CAL menu option If any errors are encountered or the Mode or Esc keys are pressed during temperature calibration the procedure will be aborted with no new data stored and any previous temperature correction data will be retained B LINEAR CAL Display will ask to load the required weights in turn Place the weights onto the weighing pan in turn and press the Setup Enter key Please note that the weights are not selectable Pressing the Mode key at any time escapes back to the LINEAR CAL menu option Pressing the Esc key at any time returns to weighing If any measurement errors are encountered an appropriate error message will flash on the display until any key is pressed when the instrument will return to the LINEAR CAL menu option If any error is encountered or the Mode or Esc keys are pressed durin
28. sing the Setup Enter key while in normal weighing gives access to the Supervisor Menus e When Setup Enter is pressed and passcode is not enabled the display will show the Supervisor menus If passcode is enabled the balance will ask for it by displaying PASSCODE 0 e f a wrong code is entered an ERROR CODE message will flash and the balance will return to weighing mode e f the passcode has been enabled and entered the balance will allow the user to access the Supervisor s menus by which the user can enable disable weighing units or modes set balance parameters for the conditions set time and date set parameters for the RS 232 interface calibration parameters and security parameters e The display will show the first menu UNITS The Up and Down keys will cycle through the main menus pressing the Setup Enter key will enter the menu and Adam Equipment Company 2007 28 sub menu or options can be set Press Mode to come out of a sub menu or Esc to return to normal weighing e Press Setup Enter when CAL SETUP is displayed to select the calibration parameters e The options for each parameter can be scrolled through by using the Up or Down key When INT GAL is displayed select YES by pressing the Setup Enter key The value of the internal mass set in the factory will be displayed e A new internal value can then be reset to make the external mass value display correctly If the reading
29. sion resistor creating a voltage that is measured by the A D converter Mechanical parts surrounding the balance beam make the force generated due to the unknown mass go in a straight line through the balance beam thus eliminating any differences depending upon the location of the mass on the balance weighing pan The electronics measure the voltage using precision amplifiers A D converter with high resolution and a microprocessor working with memory displays and power supply he microprocessor uses information from the A D converter a separate temperature sensor amp A D converter for measuring the magnet temperature and the internal program to determine the weight of the unknown mass and all other information to be displayed he system uses special programs to correct any temperature variations in the mechanism The balance is tested and calibrated at extreme temperatures and the details are stored in the memory These details are used to compensate for temperature changes inside the balance due to self heating and ambient conditions The internal calibration models include an internal calibration weight controlled by the microprocessor This weight is not accessible by the user Calibration can be performed when the temperature sensor detects a change in the pre set temperature or the pre set time either automatically or by manually entering in to the Calibration Menu Adam Equipment Company 2007 3 ELECTRONICS MODULES Within
30. the balance there are electronic modules for e Main PCB assembly including analogue circuit e Interface PCB assembly includes power supplies amp RS 232 circuits e Display PCB e Calibration motor system PRINCIPLES OF BALANCE MECHANISM Current to Coil Calibration Mass Motor Current Temperature Sensor 395232 LiProcessor V M u Filter u S Details of the operation of the balance are found in the PW User Manual Adam Equipment Company 2007 4 2 2 MODEL DIFFERENCES The PW Series of balances have capacities from 120g to 250g The basic electronics and software are identical the only differences between the different models are e Value of current sense resistors are selected to optimise the voltage to the A D converter e All other changes are set by parameters stored in memory and set at the factory by the manufacturer and can not be modified outside the factory TABLE 1 LIST OF FLEXURES Common for all models P NOTE To order for spare flexures refer to Table 14 at the end of this manual Adam Equipment Company 2007 5 2 3 INTERNAL CALIBRATION MECHANISM The mechanism for controlling the internal calibration mass consists of Internal calibration mass 1 Mechanism for a lever to move the calibration masses 2 Electrical motor 3 with cam 4 operated from the optical switch 5 Calibration process can be started by user using calibration menu internal calibrati
31. tive area of a flexure must align with the active area of all other flexures in the same axis Do not over tighten the flexure screws Residual stress is often a cause of drift with temperature or unstable readings When tightening the screws work slowly from one screw to the others to tighten all screws a little at a time Do not allow the flexures to twist when tightening the screws Be certain you are using the correct flexures for the balance Many flexures look very similar but have different applications The major difference between similar flexures is the thickness of the active area Be very careful not to bend flexures during installation Remember flexures are designed to be very weak in the direction they bend They are not strong enough to support a large weight in the bending direction 6 4 REPAIRING THE KEYPAD AND LCD Step 17 If you need to replace the Display LCD Panel or Keypad overlay remove the 4 screws using the 3mm Allen Hex Key as shown here 4 x screws EELEE LCD Panel Detached 4 RS Display cable 1 d Step 18 Detach the Display Cable from the Step 19 After replacing the faulty part LCD Panel ensure the cable connections are right Adam Equipment Company 2007 22 6 5 RE ASSEMBLING THE BALANCE PARTS Step 20 After all repair work is done follow the steps backwards to re assemble the balance Slide back the mechanics housing in original position carefully
32. ts Adam Equipment Company 2007 40 CC Manufacturer s Declaration of Conformity This product has been manufactured in accordance with the harmonised European standards following the provisions of the below stated directives Electro Magnetic Compatibility Directive 89 336 EEC Low Voltage Directive 73 23 EEC Adam Equipment Co Ltd Bond Avenue Denbigh East Milton Keynes MK1 1SW United Kingdom FCC COMPLIANCE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment The equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Shielded interconnect cables must be employed with this equipment to insure compliance with the pertinent RF emission limits governing this device Changes or modifications not expressly approved by Adam Equipment could void the user s authority to operate the equipment WEEE COMPLIANCE Sealed Lead Acid Battery Must be recycled Properly Any Electrical or Electronic Eq
33. uipment EEE component or assembly of parts intended to be incorporated into EEE devices as defined by European Directive 2002 95 EEC must be recycled or disposed using techniques that do not introduce hazardous substances harmful to our health or the environment as listed in Directive 2002 95 EC or amending legislation Battery disposal in Landfill Sites is more regulated since July 2002 by regulation 9 of the Landfill England and Wales Regulations 2002 and Hazardous Waste Regulations 2005 Battery recycling has become topical and the Waste Electrical and Electronic Equipment WEEE Regulations are set to impose targets for recycling Adam Equipment Company 2007 41 ADAM EQUIPMENT is an ISO 9001 2000 certified global organisation with more than 30 years experience in the production and sale of electronic weighing equipment Products are sold through a world wide distributor network supported from our company locations in the UK USA SOUTH AFRICA and AUSTRALIA ADAM products are predominantly designed for the Laboratory Educational Medical and Industrial Segments The product range is as follows Analytical and Precision Laboratory Balances Counting Scales for Industrial and Warehouse applications Digital Weighing Check weighing Scales High performance Platform Scales with extensive software features including parts counting percent weighing etc Crane scales for heavy duty industrial weighing Digital Electronic Scales for Medi
34. upervisor menu select the PASSCODES option e From the PASSCODES menu select the OPERATOR option e Enter the dealer passcode which is 41218 DLR as D 4 1 12 R 18 letter of the alphabet Press Setup Enter e Press the Mode key three times or press the Esc key to return to weighing and then the Setup Enter key to return to the outer level menu which now displays SUPERVISOR e From this menu select the DEALER option Available options on the dealer menu are 1 ADC COUNTS The balance displays the averaged temperature compensated and linearity corrected weight ADC counts in the small digits and the spread of the last 50 readings in the large digits e Pressing the Unit key switches the display between the weight and temperature ADC counts e Temperature counts display is indicated by a T symbol and shows the individual temperature ADC counts in the small digits and the average of the last 10 readings in the large digits e Pressing the Setup Enter or Mode key escapes to the next item on the dealer menu e Pressing the Esc key returns to weighing TABLE 10 WEIGHT ADC Zero Setting gt 500 000 0 5 to 1 5 million Maximum Linearity Load lt 16 000 000 14 16 million See Table 8 Adam Equipment Company 2007 2b TABLE 11 MAXIMUM LINEARITY LOAD BALANCE MAXIMUM LINEARITY MODEL LOAD PW 124 130g PW 184 190g PW 214 220g PW 254 260g 2 DATA COMMS Displays ACTIVE when se
35. upply circuit board failure Short circuit on any circuit board Display does not turn on Power is getting to Display cables may be faulty but the calibration motor balance display is not moves when power is working applied Display module failure The display stays on the Unstable balance Check if balance is stable position of initial test screen when calibration mass and view A D values power is applied Calibration weight motor is On Power supply Balance not working correct Check whether the ring around the pan is touching the pan Check power supplies Adam Equipment Company 2007 8 BALANCE WORKS BUT IS NOT STABLE Balance is unstable bya Noise or vibration from Check whether the temperature is stable few divisions environment Check the balance is positioned correctly to Friction in mechanics avoid vibration wind or air movement it Is on a solid table It is not near sources of heat or cool air Check balance with weights if problem occurs when sample is used Static electricity on the samples can cause drifting and instability Check the area around the weighing pan for hair dust obstructions under the pan A complete inspection of the mechanics to look for sources of friction may be needed Balance is very unstable Mechanical problems Check whether the temperature is changing and does not weigh or there is a draught Balance programmin correctly Prog 9 complete inspection of
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