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- Page 1 KERN & Sohn GmbH 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 Pallet truck scale KERN VHT Version 1.0 5/2009 VHT-SH-e-0910...
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Page 2: Table Of Contents
KERN VHT Version 1.0 5/2009 Service manual Pallet truck scale CONTENTS HOW TO USE THIS SERVICE MANUAL............4 THE PRINCIPLE OF THE PALLET TRUCK SCALE ........... 5 MECHANICS....................5 LOAD CELLS ....................6 INDICATOR ....................7 BATTERY..................... 7 POSSIBLE PROBLEMS..................8 DESCRIPTION OF PROBLEM AND WHERE TO LOOK FOR CAUSES.... -
Page 3: Basic Information
Das Gerät darf nur von geschultem oder beruflich ausgebildetem Fachpersonal (z. B. eichrechtlich anerkannter Instandsetzer) repariert werden. Die Serviceanleitung ist bindend für Reparaturen. Das Gerät muss nach erfolgter Reparatur wieder in den Originalzustand zurückversetzt werden. Es dürfen nur Originalersatzteile verwendet werden. VHT-SH-e-0910... -
Page 4: How To Use This Service Manual
!!! 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 touch the contacts on the electronic boards. Static electricity will destroy components. VHT-SH-e-0910... -
Page 5: The Principle Of The Pallet Truck Scale
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). VHT-SH-e-0910... -
Page 6: Load Cells
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. VHT-SH-e-0910... -
Page 7: Indicator
Because of the extremely small signal levels the board is very sensitive to humidity and contact with chemical substances that will influence the solder contacts. 2.4 BATTERY The power supply takes place via an 12V interchangeable battery module (VHT-A01). VHT-SH-e-0910... -
Page 8: Possible Problems
G. An error message indicates over- or underload, with or without load on the scale. H. The display does not react to loads being placed on or removed from the scale. Keys do not work. J. Segments fail on display. For error messages displayed on the indicator, please refer to chapter 9. VHT-SH-e-0910... -
Page 9: Description Of Problem And Where To Look For Causes
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. VHT-SH-e-0910... -
Page 10: Explanation Of Possible Causes And How To Fix Them
5.1 CHECK BATTERY • Check the battery Empty battery can be replaced with an 12V interchangeable battery module (VHT-A01). 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. -
Page 11: Check Load Cells
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) VHT-SH-e-0910... -
Page 12: Check Cabling And Load Cell Board
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. VHT-SH-e-0910... -
Page 13: Calibrate Load Cells
5.6.3 Check for broken or loose connections None of the cables to the switch, safety fuse holder or plug should be loose. VHT-SH-e-0910... - Page 14 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. 5.6.8 Check LCD display on the indicator By bending the board slightly while functioning, in different directions and diagonally, broken display contacts can be located. VHT-SH-e-0910...
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Page 15: Parameter Settings
If no changes were made, the display will return directly into the normal weighing mode. In the following pages the different parameters are explained and the standard settings are given. Parameters which are not yet used will not be accessible or displayed with underscores. VHT-SH-e-0910... - Page 16 1= not used 2= remote display continuously 3= printer (without date/time/switched supply) 4= not used Number of linefeeds comport 1 27-29 Not used Baudrate comport 2 600-1200-2400-4800-9600-19200 9600 Databits comport 2 Parity comport 2 none/odd/even none Stopbits comport 2 VHT-SH-e-0910...
- Page 17 Reset to default parameter If parameter 01 was on 1 it will default to the settings including calibration EU settings, if P01=2 the US settings will be parameters defaulted. New delivered boards will have the EU settings. 92-99 Not used VHT-SH-e-0910...
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Page 18: Calibration Instructions
For a normal weighing system this would be between 5 and 8 percent. A larger percentage could mean one or more load cells are broken. A lower percentage could mean the fork cover is not mounted. The zero point has been defined, the system automatically returns to the standard weighing mode. VHT-SH-e-0910... -
Page 19: Single Point Calibration
] key. The display now shows the value of the gravitation constant. Use the [ ],[ ] and [ ] keys to correct this for your position. Press the [ ] key to return to the standard weighing mode. VHT-SH-e-0910... -
Page 20: Multi-Point Calibration
] key. The display now shows the value of the gravitation constant. Use the [ ], [ ] and [ ] keys to correct this for your position. Press the [ ] key to return to the standard weighing mode. VHT-SH-e-0910... -
Page 21: How To Adjust The Lowering Valve
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 counter nut pressure bolt VHT-SH-e-0910... -
Page 22: Error Messages
Calibration value of the 2nd (3rd) point lower than the value of the 1st (2nd) Err10 point Err11 Calibration from piece counting mode Err97 Calibration blocked Err98 The calibration value must be higher than the previous one Err99 Actuation only allowed on the display device VHT-SH-e-0910... -
Page 23: Dimensions Of Pallet Truck Scale
10 DIMENSIONS OF PALLET TRUCK SCALE Production tolerance ±2 mm VHT-SH-e-0910... -
Page 24: Spare Parts
11 SPARE PARTS EXPLODED DRAWING VHT-SH-e-0910... -
Page 25: Vht-Sh-E
Cable for thermal printer MP-BRACKET-WHPT-RAL9005-AP Mountig bracket APS MP-BRACKET-ADA-21-PIN Indicator adaptor bracket MP-BRACKET-IN-21-41-HIGH Indicator mounting support FR-21-KERN-VHT Touch panel (overlay) KERN VHT IN-31 Display board indicator 3100 EB-31-OPT Option board indicator 3100 EP-VOL-REGULATOR-7/40-5 Voltage regulator PRP-CA-APS-RS232-500MM Printer cable APS - RS232...
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