KERN VHB Version 1.0
Contents
1. height 2 Bringing operating handle in neutral position for easy transportation of the goods 3 Bring handle forward until it hits the stopper 4 Loosen counter nut open end wrench 10mm Slowly tighten pressure bolt clockwise until the lowering process begins Allen wrench 3mm As soon as the lowering process begins tighten pressure bolt with 1 5 counter clockwise turns 5 Tighten counter nut completely 6 The lowering process on the unit should work correctly on each pump handle position pressure bolt counter nut 22 VHB SH e 0710 9 ERROR MESSAGES HELP 1 HELP 2 HELP 3 HELP 4 HELP 7 LO BA Weighing system overloaded Taring impossible due to negative gross weight Negative signal of load cells to A D converter slant Entered tare weight is too high Press the again order to cancel the HELP display and enter a new reduced tare weight The signal of the load cells on the A D converter is too high The battery status is too low replace batteries VHB SH e 0710 23 10 WIRING Printer connections 4 1 oo oo ru oo rJ E o0252202222205 9 loo ooo 9 5 ex Loadcell connect ions Designer checked by approved by filename DATE scale NvdB KERN Wir2. identical read out plus or minus 1 or 2 kg If the read outs are not identical and show a difference larger than 2 graduations see 5 2 2 5 2 2 Try to determine where there is interference between weighing and non weighing components It may be necessary to dismantle the system to see where the interference occurs Often there are traces on the paint that indicate the most likely place If there is doubt assemble the weighing system with paper placed between the weighing and non weighing parts After loading the system to its full capacity and maybe by moving shacking the load side ways traces on the paper will show where the friction might be Determine what can be done mechanically in order to end this friction e g align the load cells and the upper fork shoes allow less moving space for the lifting mechanics in the forks like the push rod and the load wheel holder It might be necessary to align the rods of the load wheels to prevent them from touching the load cells It can be that with an unloaded truck it is not possible to see that friction does occur Therefore see if the rods can touch the load cells by pushing them towards the load cells Clean the inside of the forks 5 2 3 Are the bolts tightened correctly The load cells are mounted with bolts These must be tightened correctly Check if all bolts are tightened firmly 5 2 4 Are the fork shoes mounted freely Always check this Underneath the pallet truck you can see whether
3. mind when trying to locate a problem in the indicator housing or on the board Don t be afraid to check and apply heavy shocks to the indicator It is the only way to discover problems that occur when the system is used It will also show latent problems 5 6 1 Check the safety fuses In the housing of the indicator a safety fuse is mounted Check this fuse with an ohm volt meter 5 6 2 Check the separate components When the indicator board has been taken out of the housing it is possible to see whether everything looks all right whether other components are loose or if bending the board changes the problem 5 6 3 Check for broken or loose connections None of the cables to the switch safety fuse holder or plug should be loose 12 VHB SH e 0710 5 6 4 5 6 5 5 6 6 5 6 7 5 6 8 If the display is unstable or does not react to weights check whether the indicator causes the problem Disconnect the indicator from the load cells also if the display will give an error message Connect each load cell individually If the indicator remains unstable or does not react to the different load cells most likely the indicator module is faulty If the display is unstable check for moisture Look for condensation or water drops on the plugs Look closely at the circuit board when dismantling the upper plate and pulling out the plug from the indicator module Dry it with warm air If the board is oxidised it can help to heat solder po
4. automatically sets the same value for both parameters and the multi interval function is not used Sets the number of graduations per multi range per 100 graduations Available values 0000 9900 for the legal for trade version 500 3000 Attention when P 02 and P 03 have equal values and the multi range is therefore inactive the value for P 04 is represented as Setting Sets the weighing capacity full scale adjustable per 100 kg Available values 00000 99900 Setting 02000 Sets the motion detection in graduations per second When the internal value varies per second more than the number of set graduations the load stability pointer will not light up in the display 0 0 5 graduation standard for option approved systems 1 1 graduation 2 2 graduations 3 4 graduations Setting 1 Not defined Sets time for AUTO OFF function minutes Available values 1 99 0 inactive Setting 3 Sets number of wires per load cell cable 4 4wires 6 6 wires prepared for approval Setting 4 VHB SH e 0710 15 P 10 P 11 P 12 P 13 16 17 18 19 20 21 22 23 24 25 Option turns off automatic zero correction For certain dosage applications 0 off 1 on Setting 1 Not defined Starting unit also calibration unit 0 kg 1 b 2 3 Ib kg Setting 0 Not define
5. the fork shoes are mounted correctly and do not interfere with the frame basis of the forks at the sides Especially welding of the load wheel axel fixture can interfere Sometimes pieces of wood or stone can cause friction between weighing and non weighing parts VHB SH e 0710 9 5 3 CHECK LOAD CELLS 5 3 1 5 3 2 5 3 3 5 3 4 When the weighing system is inaccurate check whether all load cells give the same weight Using your own weight this is very easy to check Weigh yourself while standing on the extreme corners of the system Your weight must be identical in all corners It may vary one graduation When the load cells get older or when one of them has been replaced the difference may become somewhat larger When a large difference occurs continue from 5 3 2 Check whether the problem lies with the load cells or with the mechanism Dismantle the forks shoe or the upper part of the fork Place bolts in the assembly holes of the load cells Balance a test weight of approx 1 of their capacity on each load cell on the bolts and check whether each load cell gives the same weight The maximum difference may only be 1 graduation When the difference is larger see 5 5 If there is no difference see 5 2 If a high weight is shown without a load and it is not possible to calibrate to Okg check if the load cells are working correctly Try to recalibrate the system see 5 To check whether the problem is caused by the
6. 2 MULTI POINT CALIBRATION 2 rennen 20 8 HOW TO ADJUST THE LOWERING 22 9 ERROR MESSAGES 23 10 WIRING A egei 24 11 DIMENSIONS OF PALLET TRUCK 25 12 SPARE PARTS E Aa 26 2 VHB SH e 0710 1 HOW TO USE THIS SERVICE MANUAL This service manual helps you to solve technical problems with your mobile weighing system In addition there is a calibration and parameter instruction Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Explains the principle behind electronic weighing systems Lists the most frequently occurring problems A B C D etc If your problem is listed in this overview remember the character and go to Chapter 4 Connects the problem to possible causes 1 2 3 4 etc The most encountered cause is marked with a gt Remember the number s of the cause you should check and go to Chapter 5 Explains the possible causes in more detail and describes possible solutions Explains the parameter settings Explains the calibration procedure Explains how to adjust the lowering valve IMPORTANT Do not weld on the system with the load cells mounted If the welding current passes through the load cell they will be destroyed Do not tou
7. KERN amp Sohn GmbH Ziegelei 1 Tel 0049 0 7433 9933 0 WAAGEN GEWICHTE BALANCES WEIGHTS D 72336 Balingen Frommern Fax 0049 0 7433 9933 149 Nu E Mail info kern sohn com Internet www kern sohn com Service Manual Pallet truck scale Page 2 KERN VHB Version 1 0 05 2007 CONTENTS T HOW TO USE THIS SERVICE MANUBL petet een eo 3 2 THEPRINCIPLE OF THE PALLET TRUCK SCALE eee 4 2b MECHANIC S echt ta ttt it 4 22 JLOBDGELLS inetr etr diee 5 2 3 INDICATOR qu nannan anena 6 240 BATTERY D dpi diete AAA 6 2 POSSIBLE PROBLEMS niet IM n d 7 4 DESCRIPTION OF PROBLEM AND WHERE TO LOOK FOR CAUSES 8 5 EXPLANATION OF POSSIBLE CAUSES AND HOW TO FIX THEM 9 5b 2 otio 9 5 2 GHECKMEGCHANISM de tete 9 5 37 SOHEUKEOAD CELLS HANA KHAAA 10 5 4 CHECK CABLING AND LOAD CELL 11 5 5 6 ettet ee 12 5 6 CHECK INDICATOR 2 1 tear 12 6 PARAMETER SETTINGS x p needles blah eed 14 7 GALIBRATION ANSTRUGTIONS 18 7 1 SEWOJUOINTEGAEIBERATION niai otia nd bold odio ned nd bata 18 7
8. a parameter number is shown in the display the parameter indication will automatically jump back to P 01 When all desired parameters have been changed press the Cs key for 3 seconds to leave the parameter menu and to return to the weighing mode Listed below are all available parameters Settings for specific options are indicated with an asterisk Contact the producer to check whether you have the correct hardware for this option If the hardware is not suitable for a certain function it will not be possible to activate or change that function The factory settings for your board can be found in the table Contact the producer to check which hardware version you have P 01 Option available RF function identification number to ensure that the correct devices are in communication Available identification numbers 0 7 Option RCS not available delay time for the peak hold function 0 9 seconds Setting 20 02 Sets smallest graduation of multi range 0 1 0 1 kg 0 2 0 2 kg 0 5 0 5 kg 1 1kg 2 2kg 5 5kg 10 10 kg 20 20 kg 50 50 kg Setting 1 VHB SH e 0710 P 03 P 04 P 05 P 06 P 07 P 08 P 09 Sets largest graduation of multi range 0 1 0 1 kg 0 2 0 2 kg 0 5 0 5 kg 1 1kg 2 2kg 5 5kg 10 10 kg 20 20 kg 50 50 kg Setting 1 Attention P 02 must always have a lower value than P 03 If by mistake a higher value is set then the indicator
9. a problem with the load cells If the signal is only slightly higher it may be that it works anyway but may be temporary If a problem is found the last test can be repeated with the individual load cells connected to see if one or more and which load cell s have the problem 5 3 5 Check each individual load cell The load cells are connected to the indicator with the load cell cables The cables are connected to each other by a coupling cover By removing this the load cells can be tested individually 1 Possibility Measure the power supply The power between power supply mostly red and signal mostly green and the power between power supply mostly black and signal mostly white should be equal to 20 The power between the cables and the load cells should be infinite gt 2 Possibility To check whether the problem is caused by a single load cell connect the load cells to the indicator separately from each other use the indicator as voltmeter and compare the data on the indicator per load cell The values should be almost identical The weight shown is dependant on the calibration Is a value instable or varies considerably from the other values then this load cell should be replaced Before replacing the load cell the batteries should be replaced 5 3 6 If the display is unstable check which load cell is defective When the cables of the load cells are all disconnected it is possible to test each load cell separat
10. ances that will influence the solder contacts 2 4 BATTERY The power supply takes place through 4x 1 5V type AA batteries 6 VHB SH e 0710 3 POSSIBLE PROBLEMS The most freguently occurring causes of malfunctioning of the weighing systems are Supply Worn out battery fuse or power supply Bad or broken contacts Jammed or worn out cabling Loose screws or bolts Mechanical problems the upper part of the fork has contact with the chassis or lifting mechanics of the pallet truck due to deformation wear or accumulated dirt Moisture in the electronics or load cells These problems cause 99 of all possible failures and will result in the following problem descriptions A B C D Nothing works The display is dead even when pressing the keys The indicator is unstable the weight readout goes up and down Different weights are displayed for the same load when weighed several times The weighing system is accurate with lower weights but inaccurate with higher weights The weighing system is inaccurate however the inaccuracy is linear meaning the error is always the same percentage of the weighed load Without a load a positive or negative weight Help 2 or 3 is displayed and it is not possible to reset the display to Okg The scale reacts normally when a load is placed on the scale An error message indicates over or underload with or without load on the scale The display does not react to load
11. ator shows the value of the first calibration point the NET pointer is flashing Use the keys to enter the correct calibration weight Press the key shortly the right segment starts flashing Use the or key to set the first calibration weight eg for 250 kg set to 0 Press the key shortly to confirm now the second segment is flashing Use the Or key to set this to 5 Press the Ca key shortly to confirm now the third segment is flashing Use the or ya key to set this to 2 The thousands segment should be set if necessary to 0 in the same way as the previous segments Q Confirm all other segments with until the NET pointer is flashing Lift the calibration weight in the above mentioned example 250kg Press the key for about 4 seconds to confirm display counts down to 00 The first calibration value is displayed The first calibration weight can be lowered Press the key the pointer is flashing the middle calibration value can now be entered Press the key shortly the right segment starts flashing Use the keys to set the middle calibration weight 1250kg as described above Confirm all segments with until the pointer is flashing Lift the calibration weight the above mentioned example 1250kg Press the key for about 4 seconds to confirm display counts
12. ch off automatically 2 minutes after the lo ba indication comes on 0 inactive 1 active Setting 1 Main function keys 2 and 3 0 all functions are activated 1 PT deactivated 2 gt deactivated 3 PT and deactivated incl the net and stability pointers Setting 20 Not defined Shows software version of the indicator e g 7 51 VHB SH e 0710 17 7 CALIBRATION INSTRUCTIONS The indicator offers the possibility to enter a maximum of three calibration points multiple point calibration The advantage is that even weighing systems with bad hysteresis can be calibrated within specifications Since these instructions are often used in the field where it is difficult to calibrate various points we will start with the explanation of single point calibration POSSIBILITIES There are two different ways to calibrate the system In both cases a zero calibration should be performed before the calibration takes place 1 Two point calibration calibration weight 1000kg to 1500kg This is a zero calibration and 1 weight calibration at about 50 to 75 of the capacity of the weighing system 2 Multi point calibration for weighing systems with accuracy problems calibration weights about 200kg 1000kg and 1500kg This is a zero calibration three weight calibrations at about 10 50 and 75 of the capacity of the weighing system DEFINING ZERO Unload the system Switch the system on Lift the weighin
13. ch the contacts on the electronic boards Static electricity will destroy components VHB SH e 0710 2 THE PRINCIPLE OF THE PALLET TRUCK SCALE The pallet truck scale consists of the following components Mechanics Load cells Indicator module Battery m NM 2 1 MECHANICS The mechanical part is the pallet truck chassis with a special fork construction For the weighing system the pallet truck fork consists of two parts 1 The basic chassis 2 The upper forks Between the lower basic fork construction and the upper fork sensors load cells are mounted that will sense the force placed on the upper fork It is most important that all forces pass through the load cells and that no parts of the basic fork pushrod or load wheel holder of the pallet truck have mechanical contact with the upper fork weighing part 4 VHB SH e 0710 2 2 LOAD CELLS One of the two most important components of weighing pallet truck are the load cells A load cell is a rectangular steel component built in the special pallet truck chassis in the lower part of the fork The load cell has a deformation 0 07mm under a load of 1000 kg This deformation depends on the weight of the load In the load cell electrical resistor called strain gauges are glued to the load cell body Strain gauge The electrical resistance of the strain gauges in the load cells changes linearly with the deformation of the load cell T
14. d Option peak hold function not available 0 standard function 1 peak hold function Setting 0 Not defined Option printer or printer output Sets baud rate Available values 600 1200 2400 4800 9600 Setting 9600 Option printer or printer output Sets the number of data bits Available values 7 8 Setting 8 Option printer or printer output Sets parity E even none 0 odd Setting Option printer printer output Sets number of stop bits Available values 1 2 Setting 1 Not defined Option printer or printer output Sets RS232 board function 0 Standard 1 Standard with printer 2 7 not used Setting 0 VHB SH e 0710 P 26 P 27 89 P 90 P 91 P 92 P 93 94 98 99 Option printer or printer output Sets number of line feeds after total print Available values 0 7 Setting 5 Not defined Reset to factory settings When after selection of parameter P 90 the key is pressed all parameter settings are automatically reset to the factory settings NB Be aware that the factory settings are incorrect for some systems Make sure that you have a copy of the correct parameters before resetting the system Do not use this setting the unit will need to be recalibrated Not defined Sets the low battery auto shut off function When activated the indicator will swit
15. down to AF00 The middle calibration value is displayed The middle calibration weight can be lowered Press the key the NET pointers are flashing the last calibration value can now be entered Press the key shortly the right segment starts flashing Use the keys to set the last calibration weight 1875kg as described above Confirm all segments with until the NET pointers are flashing Lift the calibration weight in the above mentioned example 1875kg 20 VHB SH e 0710 Press the key for about 4 seconds to confirm The display counts down to AF00 The last calibration value is displayed Press the key to leave the calibration mode the weigh systems displays eg AP 11 internal value Press the key for about 4 seconds the system returns to standard weighing mode shows the actual weight on the forks the calibration is completed and the calibration load can be lowered Attention When a weighing system is calibrated using the multi point calibration the smallest weight should be used first then the middle weight and finally the largest weight If only 1 calibration weight is used then values 2 and 3 must be set to 00000 VHB SH e 0710 21 8 HOW TO ADJUST THE LOWERING VALVE If the lowering of the forks after a longer period of time no longer functions correctly please follow the below procedures 1 Pump handle until forks lock into position
16. e Without a load on the forks a negative or positive weight is displayed It is not possible to reset the display to zero The system works normally once a weight is placed on the unit See calibration procedure The zero setting has a restricted capacity Calibrating the system will bring the zero setting to within the restrictions The display does not react to loads being placed on the scale Check the indicator Only 5 6 1 and 5 6 4 Check the cabling Check the load cells Keys do not work Check the indicator Segments fail on display Check the indicator VHB SH e 0710 5 EKPLANATION OF POSSIBLE CAUSES AND HOW TO FIK THEM 5 1 CHECK BATTERY Check the battery Empty batteries can be replaced with 4x 1 5V new AA batteries See operating manual 5 2 CHECK MECHANISM 5 2 1 Check whether weighing is obstructed mechanically Weigh yourself while standing on the extreme corners of the system Your weight must be identical on all corners The difference between the weights maybe up to one graduation If this is the case it may be concluded that all load cells are working and the mechanics are fine with small loads After finishing this test load the weighing system with a normal or heavy load Using the tare key the display is reset to zero Now with this weight on the scale load the corners of the weighing system by placing your own weight on top or side of the weight that is on the scale Each corner should give an
17. e pointer is flashing the middle calibration value should be set to 00000 for a two point calibration Press the key shortly the right segment starts flashing Use the keys to set the middle calibration weight 00000kg as described above Confirm all segments with until the pointer is flashing Press the key for about 4 seconds to confirm The display counts down to 00 The middle calibration value is displayed Press the key the NET pointers are flashing the last calibration value should be set to 00000 for a two point calibration Press the key shortly the right segment starts flashing Use the keys to set the middle calibration weight 00000kg as described above Confirm all segments with until the NET pointers are flashing Press the key for about 4 seconds to confirm The display counts down to 00 The last calibration value is displayed Press the key to leave the calibration mode the weigh systems displays eg AP 11 internal value Press the Cs key for about 4 seconds the system returns to standard weighing mode shows the actual weight on the forks the calibration is completed and the calibration load can be lowered VHB SH e 0710 19 7 2 MULTI POINT CALIBRATION The weighing system should be turned on and the zero calibration should already be completed Press the key for 20 seconds The indic
18. ely Connect each load cell separately to the indicator in order to see if and which load cell is unstable If the indicator reacts unstable at each load cell check again if the indicator is not the cause for this problem see 5 6 5 4 CHECK CABLING AND LOAD CELL BOARD 5 4 1 Check for damaged cables Touch the load cell cable or move it back and forth especially where the cable is connected The indicator should not react to this If the indicator reacts then the cable is damaged internally or there is moisture in the cable and the cable needs to be replaced The load cell board should also be checked If the load cell board of the connected cables is bent without touching the contacts points and the indicator reacts then there is a bad connection If the load cell board is oxidized then warming the solder points with a soldering unit can offer a solution The cable can be replaced temporarily by another cable to see if this will solve the problem VHB SH e 0710 11 5 5 CALIBRATE LOAD CELLS Calibration of load cells Standing on one of the two forks will load the load cells with your own weight Register the weight and then stand on the other fork The difference should not be more than 1 graduation eg 1 kg If there is a bigger difference then the load cells could be broken Position of the load cells in a pallet truck scale 5 6 CHECK INDICATOR With mobile weighing systems most problems are caused by shocks Keep this in
19. g system by pumping the handle twice The weighing system is not underneath anything and is standing completely free Push the key for about 9 seconds until the screen changes then release the key The weighing system shows several settings The zero calibration is completed and the weighing system will return to standard weighing mode 7 1 TWO POINT CALIBRATION The weighing system should be turned on and the zero calibration should already be completed Press the key for 20 seconds The indicator shows the value of the first calibration point the NET pointer is flashing Use the keys to enter the correct calibration weight Press the key shortly the right segment starts flashing 18 VHB SH e 0710 Use the or key to set the first calibration weight eg for 1472 kg set to 27 Press the key shortly to confirm now the second segment is flashing Use the or key to set this to 7 Press the key shortly to confirm now the third segment is flashing Use the or key to set this to 4 The thousands segment should be set if necessary to 1 in the same way as the previous segments Q Confirm all other segments with until the NET pointer is flashing Lift the calibration weight in the above mentioned example 1472kg Press the key for about 4 seconds to confirm The display counts down to AF00 The first calibration value is displayed Press the key th
20. he load cell is connected with four wires to the indicator Two wires black and red supply an input voltage to the load cell This voltage to the load cells is called excitation The output voltage of the load cell called signal green and white wires depends on the strain gauge resistance change With maximum load on the load cells example 4 x 1000 kg the signal voltage caused by the change in resistance is approximately 0 01 Volt The signal voltage at 100 kg is only 0 0002 Volt The signal change level with 1 kg weight change is only 0 000002 Volt When working with such small electrical signals the cabling has to be 100 Therefore the signal is transmitted from the load cells to the indicator via a special cable All connections have to be soldered and humidity or corrosion of contacts will cause instability in the reading VHB SH e 0710 5 2 3 INDICATOR The indicator operates like an ohm voltmeter The change in resistance is measured translated and displayed as weight indicator is a multitude more accurate then a multimeter but in a very limited voltage range It measures micro voltages at extreme high accuracies independent from temperature changes and distortion of radio frequencies The indicators have a power supply of 6 Volt The power consumption of the indictor is below 20 Because of the extremely small signal levels the board is very sensitive to humidity and contact with chemical subst
21. indicator it is most simple to replace the indicator and perform a simple calibration If this does not solve the problem see 5 3 4 and 5 3 5 When the indicator shows an error message or is unstable Turn off the indicator and measure with an ohm voltmeter whether the resistance between all load cell wires and the pallet truck chassis is infinite No resistance value at all is allowed between the black white and green load cell wires to the chassis The resistance between disconnected load cell excitation wires black and red should be 350 Ohm if one load cell is checked 87 Ohm if all 4 load cells are checked when connected parallel These values should also be measured between the load cell signal wires white and green With the indicator turned on between the load cell excitation wires black and red the following values should be measured Standard system and without printer 3 3 V DC e Legal for trade system class 111 and or with a printer 2 5V AC Because of a block voltage depending on the voltmeter a voltage between 2 2 or 2 5 will be measured If not the indicator has a problem With the indicator turned on with no load on the forks between the load cell signal wires green and white the following values should be measures Standard system and without printer 0 000 to 0 002 V DC V AC for printer and or approved systems VHB SH e 0710 If the signal level is higher or negative there is
22. ing 16 12 05 drawing nome KERN Wiring indicator board front loadcells and printer drawing number KERN Wiring VERSION drawing format 24 VHB SH e 0710 11 DIMENSIONS OF PALLET TRUCK SCALE 103 205 mm Production tolerance 2 mm VHB SH e 0710 25 12 SPARE PARTS EXPLODED DRAWING E M 1 approved checked by Lost updated Updoted by filenome DATE scale Qc Nv SW SPD KERN VHB 01 01 12 06 nos drawing name KERN Partslist VHB drawing number VERSION drawing format SPD KERN VHB 01 M VHB SH e 0710 26 KERN VHB 2T1 SPARE PARTS LIST No Part Number Description Quantity 1 RVHB 1001 Load cell 4 2 RVHB 9001 Mounting plate for load cell 3 mm 4 3 RVHB 8001 Handle drawbar 1 4 RVHB 8002 Pump 1 5 RVHB 8003 Steering wheel rubber 2 6 RVHB 8004 Chassis of the mobile weighing system 1 7 RVHB 6001 Upper forks fork shoes 1 8 RVHB 8005 Load roller tandem PU kit 2 9 RVHB 8006 Erection column of indicator module 1 10 RVHB 8007 Cover plate of hole for printer 1 2 1 11 RVHB 4001 Overlay 1 12 RVHB 8008 Battery cover 1 13 RVHB 8009 Plastic housing 1 14 RVHB 2001 Indicator PCB 1 15 RVHB 2002 Load cell board 1 16 RVHB 2003 Indicator modu
23. ints carefully with a solder iron around the analogue circuit When can you be certain that the indicator board is faulty The display is faulty when nothing changes when load cells are being disconnected nothing lights up with 6 V DC at the right contacts and functioning keyboard the indicator remains unstable even with only one load cell connected the display reacts when the indicator module is subjected to shocks Check the touch panel Look at the flat cable The silver conducting layer is very thin Wear in a small area can cause the touch panel to dysfunction The connector on the flat cable is very sensitive to humidity Check for this If humid heat this component for a longer period of time Check LCD display on the indicator By bending the board slightly while functioning in different directions and diagonally broken display contacts can be located VHB SH e 0710 13 gt PARAMETER SETTINGS Switch off the indicator To activate the parameter menu press the key for 23 seconds J The indicator shows P 01 Press the The indicator shows the current value of parameter P 01 Use keys and to change the current value Confirm with The indicator shows P 02 Parameter 02 can now be changed the same way as P 01 1 With the key it is possible to scroll through the parameters until the desired parameter is reached When the key is pressed shortly while
24. le complete incl overlay 1 17 Local Batteries size AA 1 5V 4 18 RVHB 9002 Screws to fix the load cells 8 19 RVHB 9003 Screw nut to fix the fork shoes 4 RVHB 9004 Gasket set of hydraulics 1 VHB SH e 0710 27
25. s being placed on or removed from the scale Keys do not work Segments fail on display For error messages displayed on the indicator please refer to chapter 9 VHB SH e 0710 4 DESCRIPTION OF PROBLEM AND WHERE TO LOOK FOR CAUSES PORN Nothing works The display is dead even when pressing the keys Check battery and charger Check the indicator Is the safety fuse still good or is there a bad contact The indicator is unstable the weight readout goes up and down Check the mechanism of the fork construction Check the load cell cables and the load cell calibration board Check the indicator for moisture or loose contacts 5 6 2 up to 5 6 6 Check the load cells Are the screws tight The same load is lifted several times but different weights are displayed Check the mechanism of the fork construction Check the load cells The weighing parts may not have contact with fixed non weighing parts The weighing system is accurate with small weights however it is inaccurate with heavy weights Check the mechanism of the fork construction Because of the bending of the loading part of the system the weighing part has contact with the rigid part of the system The weighing system is inaccurate however the inaccuracy is linear This means that with a load of 100 kg the inaccuracy is 1 kg with 500 kg it is 5 kg and with a load of 1000 kg the inaccuracy is 10 kg See calibration procedur
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