Kern PLE, PLS, PLJ Precision Balance Service Manual
Contents
1. 6 PLE N PLS F SH e 1021 AUT CAL Factory setting of verified balances I CAL E CAL TEC CAL To finish the menu press the MENU button and keep it pressed until the acoustic signal gets mute The balance returns automatically into weighing mode With activated AUT CAL function the internal calibration is automatically started when the balance e after the weighing balance was disconnected from the mains e after pressing ON OFF in stand by mode e after a temperature change of 1 5 C with non loaded weighing plate zero display e after atime interval of 20 min with non loaded weighing plate zero display The automatic calibration function is always enabled You can start calibration at any time by pressing the CAL key manually When the I CAL function is activated the internal calibration is started only by pressing the CAL button Before pressing CAL ensure that there are no objects on the weighing plate At the models with internal calibration weight the calibration with external weight is not recommended Technical Calibration Adjustment of internal calibration weight This function allows storing the value of internal reference mass PLE N PLS F SH e 1021 7 3 Verification Mode Certified balances OIML On certified balances only PLS FM PLJ FM some parameters are locked e g TEC CAL In order to change these parameters proceed as follows 1 Switch off the balance unplug the power supply and open2. 11 4 PLS 3100 2F PLS 3100 2F CODE DESCRIPTION A368 CELL SUP1 30009 M921 OMEGA SUPPORT FOR SUP1 CELL M914 SPAGER LOAD CELL SUP1 M915 CONE SUPPORT SUP1 M923 CENTIGRAM CONE M917 HOOK LOAD CELL SUP M401 UNDERPLATE FOR CENTIGRAM 406 PLATE 160mm A717 PLASTIC COVER 6K A718 PLASTIC BOTTOM BLUE 32 PLE N PLS F SH e 1021 CODE DESCRIPTION A712 LOAD CELL SHIELD A711 BOARD SHIELD A719 ADJUSTABLE FEET PLASTIC CASE DUST COVER 6K A713 ALLUMINIUM INTERNAL CASE A503 LEVEL BUBBLE A716 DISC INOX 160mm 5307 MAIN BOARD LCMSP430 427 REV1 0 5304 DISPLAY BOARD DISP LCD ADT7124 REV1 1 E318 LCD ADT7124 9310 CABLE 14 PIN FOR KEY CONNECTING o311 CABLE 26 PIN FOR DISPLAY CON NECTING PLE N PLS F SH e 1021 33 PLS 3100 2F CODE DESCRIPTION A735 KEYBOARD PLS E755 INTERNAL BATTERY 6V 1 2Ah E493 CABLE WITH DC PLUG E748 CABLE WITH RS232 CONNECTOR E496 CABLE WITH SENSOR TEMPERA TURE E495 CABLE FOR BATTERY E807 POWER SUPPLY IN 230V OUT 9V EUROPEAN PLUG E808 POWER SUPPLY IN 120V OUT 9V US PLUG E810 POWER SUPPLY IN 230V OUT 9V UK PLUG 34 PLE N PLS F SH e 1021
3. 5308 LCMSP430 427 PL REV1 0 E317 LCD WITH BACKLIGHT ADT7138 A736 KEYBOARD PLE E755 INTERNAL BATTERY 6V 1 2Ah A127 BRACKET FIX BATTERY E809 CABLE WITH RS232 CONNECTOR S E667 WITH DC PLUG S E502 CABLE WITH SENSOR TEMPERA TURE E501 CABLE FOR BATTERY E807 POWER SUPPLY IN 230V OUT 9V EUROPEAN PLUG PLE N PLS F SH e 1021 POWER SUPPLY IN 120V OUT 9V US PLUG POWER SUPPLY IN 230V OUT 9V UK PLUG 28 PLE N PLS F SH e 1021 11 3 PLS 310 3F PLE 3100 2N CODE DESCRIPTION IMAGE A368 LOAD CELL SUP1 3000g m A131 S LOAD CELL A136 CONE SUPPORT S SUP1 her H M002 CENTIGRAM S A120 CENTIGRAM UNDERPLATE S A126 PLATE 130mm 117 COVER MARKS A118 BOTTOM MARK S B HOOK CAP S dq n A124 DISC INOX 130mm PLE N PLS F SH e 1021 29 PLE 3100 2N CODE DESCRIPTION A123 ADJUSTABLE FEET MARKS A132 DUST COVER MARK S A503 LEVEL BUBBLE 5308 LCMSP430 427 PL REV1 0 E317 LCD WITH BACKLIGHT ADT7138 A736 KEYBOARD PLE E755 INTERNAL BATTERY 6V 1 2Ah A127 BRACKET FIX BATTERY E809 CABLE WITH RS232 CONNECTOR S E667 WITH DC PLUG S E502 CABLE WITH SENSOR TEMPERA TURE E501 CABLE FOR BATTERY E807 POWER SUPPLY IN 230V OUT 9V EUROPEAN PLUG 30 PLE N PLS F SH e 1021 POWER SUPPLY IN 120V OUT 9V US PLUG POWER SUPPLY IN 230V OUT 9V UK PLUG PLE N PLS F SH e 1021 31
4. 6 1 L L UONDSUUOD pJEOG SY ma ame me Josuas eunje Jeduue ox3 OND euis jeu amp is AG uogoauuoo 122 peo PLE N PLS F SH e 1021 12 mi Test point Value If the value is not correct J3 Pin2 J3 Pin1 9 Volt DC Check Power Check Power supply Oto 7 Volt DC J2 Pin2 J2 Pini without external power Check battery supply J7 GND Tp3 5 Volt DC Check LM2940 U2 J7 GND Tp4 3 3 Volt DC Check LM3940 U3 J7 GND Tp1 7 6 Volt DC Check LM1117 U1 J7 GND 47 6 Volt DC Check IRF9120 Q1 J7 EXC J7 EXC 5 Volt DC Check LM2940 U2 Without load on weighing Check badea SIGNAL SIGNAL pan 0g 0 mV With maximum load on y SA Check SIGNAL SIGNAL weighing pan 5 mV eck load ce PLE N PLS F SH e 1021 13 6 2 PLS F 8 k o O IETETTT Display connection L 1n N nj wu dele j um JE I T jew I malli 1 e s Keyboard connection 3 3 V Tp4 3 T connection Ku m W m E E LE la 2 ner A i Temperature sensor x i x alge T a EN i i T 1 L SA AU E Kin ri D i 1 M Ww 7 OL ol PER DT JT m om SUE
5. 1 In weighing mode press the Ced button and keep it pressed until the acoustic signal gets mute The first menu item units is displayed 2 Press button repeatedly until CAlib appears and confirm using button 3 Use the Ced button to choose TEC CAL Press the G3 button and keep it pressed until the acoustic signal gets mute Display shows CAlib 4 To finish and store the menu setting press the v button and keep it pressed until the acoustic signal gets mute The balance returns automatically into weighing mode 5 With empty pan press button The display appears CAL 6 Wait until the exact size of calibration weight appears flashing in the display Now place the required weight in the centre of the weighing pan The flashing display disappears 7 The balance returns to normal weighing mode Take away calibration weight 8 Display shows the zero point e g 0 000 Press the aB button and keep it pressed until the acoustic signal gets mute The technical calibration starts During this process the display appears MEM 9 After having stored the value of internal calibration weight automatically the balance returns to normal weighing mode 10 Return to calibration mode see chapter 2 2 and set the desired calibration A mode AUT CAL or I CAL ATTENTION Use weights class E2 to maintain the accuracy PLE N PLS F SH e 1021 11 6 Measuring Points on Main Board PLE N
6. CONE SUPPORT PLE N PLS F SH e 1021 17 7 REMOVE TEMPERATURE SENSOR AND BOARD FROM THE LOAD CELL NOW YOU CAN ASSEMBLE THE NEW LOAD CELL 8 FIX TEMPERATURE SENSOR AND BOARD TO THE LOAD CELL 9 FIX THE CONE SUPPORT TO LOAD CELL AND FIX THE LOAD CELL TO THE SUPPORT 10 FIX LOAD CELL S SUPPORT TO THE BASE OF BALANCE 11 CONNECT BATTERY AND TEMPERATURE SENSOR AND SOLD ON LOAD CELL S CABLE 12 FIX THE DISPLAY BOARD AND THE BOARD SHIELD 13 CHECK AND REGULATE OFF CENTER LOAD AND LINEARITY 14 FIX THE LOAD CELL SHIELD 15 FIX THE COVER OF BALANCE PLE N PLS F SH e 1021 8 Off Center Load Adjustment Eccentricity EXAMPLE OF PLS F TOP VIEW 1 REMOVE THE COVER OF BALANCE REMOVE THE FRONT SCREW ON THE TOP Fig 3 AND FOUR SCREWS ON THE BOTTOM Fig 4 2 REMOVE THE LOAD CELL SHIELD Fig 5 3 PUT ON THE PLATE AND SWITCH ON ON THE BALANCE 4 PUT A TEST WEIGHT 1 3 OF MAX IN THE CENTER OF THE PLATE WAIT FOR STABILITY AND PRESS TARE 5 MOVE THE WEIGHT TO POINT 2A MAKE A NOTE OF THE DIFFERENCE 6 MOVE THE WEIGTH TO CENTER AND PRESS TARE 7 MOVE THE WEIGHT TO POINT 2B MAKE A NOTE OF THE DIFFERENCE 8 TAKE THE FILE AND SCRATCH AS ILLUSTRATED Fig 3 Fig 4 PLE N PLS F SH e 1021 19 Fig 6 SEE en tie upper side m 2B SCRATCH SIDE 2B Front Right N ATTENTION If the corner 1A or 1B is not correct check if the load cell is ok 20 PLE N PLS F SH e 1021 9 Main Bo
7. from weighing pan wait for stability and press to confirm 11 Display shows number 1 Remove the first weight from weighing pan pan is unloaded wait for stability and press 2g to confirm ON OFF 12 The balance goes automatically in stand by mode Press to return to weighing mode 13 Do the calibration and check the linearity PLE N PLS F SH e 1021 9 IN ATTENTION During linearity adjustment up and down mode loads the required weights according table 2 incremental on weighing pan For example load 100g weight and then add another 100g weight and so on as you reached the last value Then unload the weights in reverse order Table 2 MODEL RANGE LINEARITY g LINEARITY g 9 g DOWN PLE 310 3N 310 0 001 po 100 100 100 0 PLE3100 2N 3100 0 1000 1000 1000 1000 1000 1000 0 a ce eid PLS 310 3F 0 001 0 100 100 100 100 100 100 0 PLS 3100 2F 3100 0 1000 1000 1000 1000 1000 1000 0 I 1 4 2 Delete linearity and calibration values 1 Switch on balance 2 Press sequentially buttons 23 3 You will see Lin on display press to confirm 4 The display shows on left side the number 1 Press key and keep it pressed until the display shows CLEAR 10 PLE N_PLS F SH e 1021 5 Adjustment of Internal Calibration Weight only PLJ F models Technical Calibration TEC CAL This function allows storing the value of internal reference mass
8. the housing 2 Press and hold button SW1 on the backside of LCD display board see Fig 1 and 2 and plug in the power supply of the balance You get an acoustic signal and OIML on or OIML oFF is displayed 3 Press the key to select desired setting 4 Take over selection using the C aJ key The balance returns automatically into weighing mode 8 PLE N PLS F SH e 1021 4 Linearity Adjustment 4 1 Procedure Software release rL 2 xx For models with four linearity points up and down mode 1 Switch on the balance and notice the warming up time Far 2 Press sequentially buttons UB Vi 3 You will see Lin on display press to confirm 4 The display shows on left side the number 1 Wait for stability approx 3 seconds and press to confirm the zero point 5 When display shows on left side the number 2 put on first weight see table 2 Wait for stability approx 3 seconds and press to confirm 6 on shows number 3 Put on second weight wait for stability and press WMP to confirm 7 Display shows number 4 Put on third weight wait for stability and press 23 to confirm 8 Display shows number 5 Now press g and keep it pressed until the acoustic signal gets mute Release the key Display shows number 3 9 Remove the last weight from weighing pan wait for stability and press 29 to confirm 10 Display shows number 2 Remove the second weight
9. IN KERN amp Sohn GmbH WAAGEN GEWICHTE BALANCES WEIGHTS Ziegelei 1 Tel 49 0 7433 9933 0 D 72336 Balingen Fax 49 0 7433 9933 149 E Mail info kern sohn com Internet www kern sohn com Service manual Precision balances KERN PLE N KERN PLS F PLJ F with strain gauge DMS Version 2 1 2 2010 GB PLE N PLS F SH e 1021 KERN PLE N PLS F Version 2 1 2 2010 Service manual Precision balances Table of Contents 1 Basic Information 2 Calibration 2 1 Models with external weight 2 1 1 Calibration with recommended calibration weight factory setting 2 1 2 Calibration with weights of other nominal values 2 2 Models with internal weight 3 Verification Mode Certified balances OIML 4 Linearity Adjustment 4 1 Procedure Software release rL 2 xx 4 2 Delete linearity and calibration values 5 Adjustment of Internal Calibration Weight only PLJ F models 6 Measuring Points on Main Board 6 1 PLE N 6 2 PLS F 7 Load Cell Replacement Off Center Load Adjustment Eccentricity 9 Main Board Replacement 10 Troubleshooting Error Messages 11 Spare Parts 11 1 PLE 310 3N 11 2 PLE 3100 2N 11 3 PLS 310 3F 11 4 PLS 3100 2F PLE N PLS F SH e 1021 O O O O TAR A C O N N N N N D A A N O Oo O O R O O Bh N O 1 Basic Information Grundlegende Hinweise The device must be repaired only by trained specialist staff or personnel with professional formation such as a repair specialist accred
10. NE SUPPORT S SUP2 M922 MILLIGRAM CONE T011 MILLIGRAM UNDERPLATE M635 PLATE 80mm A117 COVER MARKS A118 BOTTOM MARKS A128 HOOK CAP S PLE N PLS F SH e 1021 23 PLE 310 3N CODE DESCRIPTION A121 PLASTIC RING A124 DISC INOX 130mm A133 CIRCULAR WIND SHIELD MARK S A134 COVER WIND SHIELD MARK S A123 ADJUSTABLE FEET MARK S A132 DUST COVER MARK S A503 LEVEL BUBBLE 5308 LCMSP430 427 PL REV1 0 E317 LCD WITH BACKLIGHT ADT7138 A736 KEYBOARD PLE E 55 INTERNAL BATTERY 6V 1 2Ah A127 BRACKET FIX BATTERY E809 CABLE WITH CONNECTOR FOR 5232 S E667 CABLE WITH DC PLUG S NO A PLE N_PLS F SH e 1021 PLE 310 3N CODE DESCRIPTION E502 CABLE FOR WITH SENSOR TEM PERATURE E501 CABLE FOR BATTERY E807 POWER SUPPLY IN 230V OUT 9V EUROPEAN PLUG E808 POWER SUPPLY IN 120V OUT 9V US PLUG E810 POWER SUPPLY IN 230V OUT 9V UK PLUG PLE N PLS F SH e 1021 25 11 2 PLE 3100 2N PLE 3100 2N CODE DESCRIPTION IMAGE A368 LOAD CELL SUP1 3000g m A131 S LOAD CELL A136 CONE SUPPORT S SUP1 her H M002 CENTIGRAM S A120 CENTIGRAM UNDERPLATE S A126 PLATE 130mm 117 COVER MARKS A118 BOTTOM MARK S B HOOK CAP S dq n A124 DISC INOX 130mm 26 PLE N PLS F SH e 1021 PLE 3100 2N CODE DESCRIPTION A123 ADJUSTABLE FEET MARKS A132 DUST COVER MARK S A503 LEVEL BUBBLE
11. S PRT ETE J E m j Signal Signal GND d ts Load cell connection Battery recharge voltage Tp1 14 PLE N PLS F SH e 1021 14 s zl E 9 D e BEDEN ic Test point Vallie If the value is not correct J3 Pin2 J3 Pin1 9 Volt DC Check Power supply Oto 7 Volt DC J2 Pin2 J2 Pini without external power Check battery supply J7 GND Tp3 5 Volt DC Check LM2940 U2 J7 GND Tp4 3 3 Volt DC Check LM3940 U3 J7 GND Tp1 7 6 Volt DC Check LM1117 U1 J7 GND 47 6 Volt DC Check IRF9120 Q1 J7 EXC J7 EXC 5 Volt DC Check LM2940 U2 J7 Without load on weighing eal pan 0 g 0 mV SIGNAL Dhu With maximum load on Check SIGNAL SIGNAL weighing pan 5 mV eck load ce PLE N PLS F SH e 1021 15 7 Load Cell Replacement EXAMPLE OF PLS F 1 REMOVE THE COVER OF BALANCE REMOVE THE FRONT SCREW ON THE TOP AND FOUR SCREWS ON THE BOTTOM 2 REMOVE THE LOAD CELL SHIELD 3 REMOVE THE DISPLAY BOARD AND THE BOARD SHIELD 16 PLE N PLS F SH e 1021 4 DISCONNECT BATTERY AND TEMPERATURE SENSOR AND UNSOLDER LOAD CELL S CABLE pu f 2 I we E y k E j P 5 REMOVE LOAD CELL S SUPPORT REMOVE THE SCREW ON THE BOTTOM 6 REMOVE LOAD CELL FROM THE SUPPORT AND REMOVE THE
12. ard Replacement If you have to order a new main board please tell us the serial number of balance and the reference code inside housing like shown below Toae eT 1 3 Bal ITmO 16 _ de Tr ka gt Xa 0202 SK I Imoo0 00000751 PLS F PLJ F PLE N KERN will program the new main board incl temperature compensation data with special developed adjustment software and a hardware key After replacing the main board you have only to do the Linearity Adjustment see chapter 4 and the Calibration see chapter 2 If necessary do the Adjustment of Internal Calibration Weight only PLJ F models according to chapter 5 In case of a faulty configuration e g wrong resolution it is advisable to send the device back to KERN for the proper configuration and adjustment procedure The configuration and the adjustment itself require extensive service training and a special developed hardware key PLE N PLS F SH e 1021 21 10 Troubleshooting Error Messages Weight value instable or zeroing not possible Check the environmental conditions Calibration error e g environmental conditions instable ER Calibration error e g incorrect calibration weight ERR ERRO4 Piece weighttoosmallinstable Piece weight too smallinstable too small instable Data transfer not possible as weighing value is instable Check the environmental conditions Weighing value in den
13. g plate 2 1 1 Calibration with recommended calibration weight factory setting Weight value of the required calibration weight see operating manual chpt 1 Technical specifications O gt Ensure that there are no objects on the weighing plate Press the CAL key gt Wait until the weighed value for the required calibration weight appears flashing VU H H x er e u ar gt During the flashing display put the required calibration weight carefully in the center of the weighing plate The flashing display disappears After successful calibration the balance automatically returns to weighing mode gt Take away calibration weight O 4 PLE N PLS F SH e 1021 2 1 2 Calibration with weights of other nominal values Weights of different nominal values may be used for calibration but are not optimal for technical measuring possible calibration points see table 1 O gt Ensure that there are no objects on the weighing plate Press the CAL button and keep it pressed until the acoustic signal gets mute _ LIL gt Wait until appears L LUIN Z A gt During the flashing display put the calibration weight carefully in the center of the weighing plate The flashing display disappears After successful calibration the balance automatically returns to weighing mode gt Take away calibration weight O An error message will be displayed i
14. ited by law concerning verification The service manual is obligatory for repair work After repair original conditions of the device have to be restored Only original spare parts should be used Instructions about conformity evaluated scales Repair must be carried only at 100 compliance with the type approval A violation of this specification will result in a loss of the type approval After successful repair the balance will have to be reverified before it can be used again in a statutorily regulated field Das Ger t darf nur von geschultem oder beruflich ausgebildetem Fachpersonal z B eichrechtlich anerkannter Instandsetzer repariert werden Die Serviceanleitung ist bindend f r Reparaturen Das Ger t muss nach erfolgter Reparatur wieder in den Originalzustand zur ckversetzt werden Es d rfen nur Originalersatzteile verwendet werden Hinweis zu konformit tsbewerteten Waagen Reparatur darf nur in 100 iger Ubereinstimmung mit der Bauartzulassung erfolgen Ein Verstof3 gegen diese Vorgabe f hrt zum Erl schen der Bauartzulassung Nach erfolgreicher Reparatur muss eine Nacheichung erfolgen um die Waage wieder im gesetzlich geregelten Bereich verwenden zu k nnen PLE N PLS F SH e 1021 3 2 Calibration 2 1 Models with external weight gt Observe stable environmental conditions A warming up time of approx 2 4 hours is required for stabilization gt Ensure that there are no objects on the weighin
15. n the event of a calibration error or incorrect calibration weight Wait until the balance is again in weighing mode and repeat the calibration procedure mie PLE N_PLS F SH e 1021 Table 1 Recommended Other measurement technically not optimal nominal calibration weight values for calibration see chap 2 1 2 see chap 2 1 1 PLE N models PLE 310 3N 300 g 100 g 200 g PLE 3100 2N 30009 1000 g 2000 g PLS F models PLS 210 3FM 200g 100g 2 2 Models with internal weight For non verified balances four calibration possibilities are available in the menu Menu settings In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute The first menu item units is displayed Press MENU button repeatedly until CAlib appears and confirm using PRINT button Use the MENU key to choose between the following settings Automatic calibration with internal weight if there is a AUT CAL change in temperature or time controlled Factory settings of verified balances Calibration with internal weight after having pressed CAL CAL locked in verifiable units Calibration with external weight E CAL locked for verifiable units TEC CAL Technicial calibration Adjustment of internal calibration weight Take over selection using the PRINT button To confirm TEC CAL press PRINT button and keep it pressed until the acoustic signal gets mute The balance returns to menu CAlib
16. sity determining mode instable ERR06 un Check the environmental conditions ERRO7 Data input error E A Weighing range not achieved viui Check position of the weighing plate CAB 0 But CAL But Calibrate balance balance NN range exceeded placed load exceeds the capacity of the balance Unload the balance Weighing range not reached e g weighing plate not in place Unstable reading Check if the load cell touched the base plate Check if something comes in contact with plate Check the input and output signal of load cell see chapter 6 measuring points on main board Only zero Delete linearization values see chapter 4 2 delete no weighing results linearity and calibration values Check the input and output signal of load cell see chapter 6 measuring points on main board Display don t work correctly Check connection of 26 poles cable Check power signal see chapter 6 measuring points on main board Change display board Keyboard failure Check connection of 14 poles cable Change keyboard Off center load error Do off center load adjustment see chapter 8 Check if the load cell is bent Linearity error Do linearity adjustment see chapter 4 Check if the load cell is bent 22 PLE N PLS F SH e 1021 11 Spare Parts 11 1 PLE 310 3N PLE 310 3N CODE DESCRIPTION IMAGE A359 LOAD CELL SUP2 300g SUPPORT S LOAD CELL A131 M926 SPACER LOAD CELL SUP2 A135 CO
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